User manual VAISALA HMP35 PROBES - OPERATING MANUAL

HMI38 HUMIDITY DATA PROCESSOR AND HMP35/36/37E PROBES Operating Manual U063en-2.1 June 1998 © Vaisala 1998 © Vaisala Oyj 1998 No part of this document may be reproduced in any form or by any means, electronic or mechanical (including photocopying), nor may its contents be communicated to a third party without a prior written notice of the copyright holder. The instruction manuals may be changed without prior notice. Yleisjäljennös 06/1998 U063en-2.1 HMI38 Operating Manual Contents 1. 2. 3. 4. PRODUCT DESCRIPTION.......................................................................................... 1 TO BE NOTED WHEN MEASURING HUMIDITY ........................................................ 2 TAKING THE HMI38 INTO USE.................................................................................. 3 COMMISSIONING....................................................................................................... 4 4.1. 4.2. 4.3. 4.4. 5. Initializing the probe locations...................................................................... 4 Connecting the analogue outputs................................................................. 4 Connecting the RS 232C or RS 485 serial bus ............................................. 5 Summary of the factory settings ................................................................... 6 COMMANDS ............................................................................................................... 7 5.1. Display/keypad commands............................................................................ 7 5.1.1. Display mode .................................................................................... 7 5.1.2. Command mode ............................................................................... 7 5.1.3. Selecting and scaling the analogue outputs ...................................... 8 5.1.4. Setting the serial line parameters ...................................................... 9 5.1.5. Setting the output mode .................................................................. 11 5.1.6. Others ............................................................................................ 12 Serial commands ......................................................................................... 16 5.2.1. Analogue output commands............................................................ 16 5.2.2. Output via the serial bus ................................................................. 18 5.2.3. Operating the HMI38 via the serial bus ........................................... 20 5.2. 6. DATA LOGGING....................................................................................................... 22 6.1. Logging 6.1.1. 6.1.2. 6.1.3. 6.1.4. using display/keypad commands ................................................. 23 Start/stop data logging in the CONTINUOUS mode ............................. 23 Start/stop data logging in the CATCH mode ...................................... 24 Outputting the logged data to the serial line .................................... 25 Outputting the logged data to the display ........................................ 26 6.2. Logging using serial line commands (CONTINUOUS mode) ......................... 27 6.2.1. Data logging ................................................................................... 27 7. CALIBRATION .......................................................................................................... 30 7.1. 7.2. Humidity calibration..................................................................................... 30 7.1.1. Calibration procedure...................................................................... 30 Temperature calibration .............................................................................. 31 7.2.1. With display/keypad commands: ..................................................... 31 7.2.2. With serial line commands .............................................................. 32 Calibrating the analogue outputs................................................................ 32 7.3. 8. USING THE HMI38 AS A FIELD CALIBRATOR........................................................ 33 8.1. HMD/W60/70 and HMP140 series transmitters ........................................... 33 8.1.1. Calibrating transmitters with voltage outputs ................................... 34 8.1.2. Calibrating transmitters with current outputs ................................... 36 HMP230 series transmitters ........................................................................ 37 8.2.1. One point calibration ....................................................................... 38 i 8.2. HMI38 Operating Manual U063en-2.1 8.2.2. 8.3. 9. Two point calibration ....................................................................... 39 HMD/W 20/30 and HMP130Y series transmitters ........................................ 40 MAINTENANCE ........................................................................................................ 42 9.1. 9.2. 9.3. Reference measurements ............................................................................ 42 Self-diagnostics ........................................................................................... 42 Adjusting the contrast of the display.......................................................... 43 10. TECHNICAL DATA ................................................................................................... 43 10.1. 10.2. 10.3. 10.4. 10.5. 10.6. 10.7. 10.8. 10.9. Relative humidity ......................................................................................... 43 Temperature ................................................................................................. 43 Calculated quantities ................................................................................... 43 Data logging ................................................................................................. 44 Analogue outputs......................................................................................... 44 Serial interface ............................................................................................. 44 Electronics ................................................................................................... 44 Mechanics .................................................................................................... 45 Electromagnetic compatibility .................................................................... 46 10.9.1. Emissions ....................................................................................... 46 10.9.2. Immunity......................................................................................... 46 11. ACCESSORIES AND SPARE PARTS ....................................................................... 46 APPENDIX 1: APPENDIX 2: APPENDIX 3: APPENDIX 4: APPENDIX 5: SERIAL COMMANDS .......................................................................... 47 ERROR MESSAGES ............................................................................ 69 HMP35E PROBE.................................................................................. 75 HMP36E PROBE.................................................................................. 81 HMP37E PROBE.................................................................................. 87 WARRANTY ..................................................................................................................... 93 This manual is valid for programme version 2.01. ii U063en-2.1 HMI38 Operating Manual 1. PRODUCT DESCRIPTION The microprocessor based HMI38 Humidity Data Processor is a light, portable instrument with an optional carrying case and built-in rechargeable battery which make it suitable for spot checking measurements or for use as a transfer standard. The HMI38 is used together with Vaisala's HMP35E, HMP36E or HMP37E humidity and temperature probes to measure relative humidity and temperature quickly and accurately. Two probes can be connected to each HMI38. The HMI38 also calculates dewpoint, mixing ratio, absolute humidity and wet bulb temperature from the relative humidity and temperature it has measured. The HMI38 has two analogue outputs (0...1V or 0...5 V) which can be selected and scaled freely. The HMI38 also has an RS 232C and an RS 485 interface. The HMI38 Humidity Data Processor is used through the menu-based display. The user can choose between metric and non-metric units. Output modes are flexible: measured or calculated quantities can be displayed or they can be transferred to a computer or peripheral device using either RS 232C or RS 485 serial bus. Because the HMI38 units are addressable, there can be several units on the same RS 485 line. The HMI38 can be used as a one point field calibrator for HMP140 series and HMD/W60/70 transmitters with standard or customized settings, as well as for calibrating their predecessors HMD/W20/30 and HMP130Y series. It can also be used as a one or two point calibrator for HMP230 series transmitters. The transmitters are calibrated using an appropriate reference cable between the HMI38 and the calibrated transmitter. The HMI38 can also be used as a data logger. In continuous data logging, the user selects the interval and the starting time of logging; the HMI38 can store up to 254 readings from both probes in CONTINUOUS mode. In addition, the HMI38 can also be used for manual data logging. The CATCH mode enables the user to store readings manually at any given moment. In this mode, the HMI38 can store 127 readings from both probes. The HMI38 stores the measured relative humidity and temperature values. When the stored data is transferred to a computer or a peripheral through the serial bus, it calculates the other four quantities from them. The HMI38 is powered with DC voltage, but with an AC adapter it can be powered from the mains. HMI38 has a built-in battery and a charger. 1 HMI38 Operating Manual U063en-2.1 2. TO BE NOTED WHEN MEASURING HUMIDITY It is essential in the measurement of humidity and especially in calibration that temperature equilibrium is reached. Even a small difference in temperature between the measured object and the sensor causes an error. If the temperature is +20 °C (+68 °F) and the relative humidity 50 %RH, a difference of ±1 °C between the measured object and the sensor causes an error of ±3 %RH. When the humidity is 90 %RH, the corresponding error is ±5.4 %RH. The error is at its greatest when the sensor is colder or warmer than the surroundings and the humidity is high. A temperature difference of a few degrees can cause water to condense on the sensor surface. In an unventilated space evaporation may take hours; good ventilation accelerates evaporation. The HUMICAP® sensor starts to function normally as soon as the water has evaporated. If the condensed water is contaminated, the life span of the sensor may shorten and calibration may change. 10 9 8 7 dRH (%RH) 6 5 4 3 2 1 0 -40 -20 0 20 40 60 80 100 Temperature (°C) Figure 2.1 Measurement error at 100 %RH when the difference between the ambient and sensor temperature is 1 °C 2 U063en-2.1 HMI38 Operating Manual 3. TAKING THE HMI38 INTO USE Please, note that when you take the HMI38 into use for the first time, both probe locations have the factory setting for the probe type HMP35E. If this is not the case, the HMI38 displays error message(s) after power up (see appendix 3). Error messages can be cleared by pressing ENT button several times. Should this happen, you must initialize the probe locations. During initialization, the HMI38 gets information on which probe locations have probes connected to them. Initializing is described in Chapter 4.1. If you use the instrument as a data logger, you must enter the correct date and time; see Chapter 6. In order to enable the HMI38 to calculate the mixing ratio and wet bulb temperature accurately, enter the ambient air pressure through the keypad or serial bus. This setting is described in Chapter 5. The HMI38 has a rechargeable battery which has not been charged in the factory. Charge the battery overnight. You can use the instrument instantly when you connect it to the mains for charging. To maximize the battery lifetime, completely discharge and recharge the battery about once a month. You can discharge the battery by leaving the HMI38 on without an AC adapter until the low battery voltage switches the HMI38 automatically off. 3 HMI38 Operating Manual U063en-2.1 4. 4.1. COMMISSIONING Initializing the probe locations You can use either keypad or serial bus commands for the initialization of the probe locations. If you use serial commands, see Appendix 1. If the probe type setting in the HMI38 memory is not correct, some error messages may appear on the display after power up (see Appendix 3). You can clear these messages by pressing ENT button one or several times. When the humidity and temperature readings appear on the display, press CL key to enter the command mode. The first display is the main menu: Use arrow keys to select Init which starts to blink, and then press ENT. The following appears with the indication of PROBE 1 blinking (in this example, HMP35E): Use arrow keys to select the correct type for PROBE 1 (HMP35E, HMP36E, HMP37E, HMP35BM, HMP36BM) and press ENT. If there is no probe in location 1, select none and press ENT. Use arrow keys to select also the type for PROBE 2 and press ENT. The HMI38 returns to the display mode showing the current readings. 4.2. Connecting the analogue outputs Figure 4.1 shows the connections to the analogue output connector. See Chapter 5.1.3 and Chapter 5.1.3.2 for selecting the quantities and for scaling the analogue outputs. ANALOGUE OUTPUT 0-1V/0-5V 1 2 3 4 5 6 7 8 9 AGND CH1 OUT NC CH2 OUT AGND NC NC NC NC D9S Figure 4.1 Cable connections to the analogue output connector 4 U063en-2.1 HMI38 Operating Manual 4.3. Connecting the RS 232C or RS 485 serial bus Figure 4.2 shows the pin configuration of the serial line connector and the RS 232C serial line connection of the HMI38 to a peripheral device. HMI38 SER I/O DO NOT CONNECT RS 232 C RXD RS 232 C TXD NC GND NC NC RS 485 HI RS 485 LO D9P D9S 1 2 3 4 5 6 7 8 9 COMPUTER (IBM AT) SER I/O 2 3 4 5 6 7 8 9 1 RXD TXD DTR GND DSR RTS CTS RI DCD DO NOT CONNECT RS 232 C RXD RS 232 C TXD NC GND NC NC RS 485 HI RS 485 LO HMI38 SERIAL PRINTER SER I/O (RS 232 PANASONIC KXSER I/O 1 2 3 4 5 6 7 8 9 2 3 4 5 6 7 8 20 22 TXD RXD NC NC DSR GND DCD DTR NC D25P D9P Figure 4.2 Wiring between the HMI38 and a PC or a serial line printer using RS 232C serial line. Connect the serial bus between the PC and the HMI38 and switch the PC on. Use a terminal emulation programme (e.g. Procomm Plus, Datastorm or Windows terminal) when using a PC. The following chapter lists the factory settings for data transfer. NOTE When changing the serial bus settings, switch the instrument off and on again or give the serial line command RESET to activate the new settings. Refer to the manuals of the PC and the terminal emulation programme when giving serial settings. 5 HMI38 Operating Manual U063en-2.1 4.4. Summary of the factory settings The factory settings of the HMI38 are the following: · probe initializations: -probe 1 -probe 2 auto power-off output units pressure analogue outputs: -channel 1 RH1: -channel 2 T1: serial line: -bauds, parity, data, stop -duplexity address serial mode echo output interval HMP35E HMP35E off metric 1013.25 hPa (= mbar) 0...100 %RH 0...1 V -40...160 °C 0...1 V 4800, even, 7, 1 FDX 0 stop on 0s · · · · · · · · · · · measurement integration time 16 filter off 6 U063en-2.1 HMI38 Operating Manual 5. COMMANDS The HMI38 incorporates a microprocessor which allows the configuration to be set according to the user's needs. This is done through commands, either utilizing the menus on the front panel display or giving commands through the serial interface. The commands can be used e.g. to choose the displayed quantities, to select and scale the analogue outputs, to calibrate the temperature channels as well as the analogue outputs and to set the serial interface. 5.1. Display/keypad commands 5.1.1. Display mode In the display mode the HMI38 outputs measured and calculated quantities on the display. You can scroll the first line with button s and the second line with button t. After reset the instrument shows first the programme type and version and then goes on to the display mode. You can scroll different quantities with arrow switches. Acknowledge each selection by pressing ENT; this way, they appear on the display even after power off. The display also shows error messages and alarms if they occur. 5.1.2. Command mode Press the CL key to enter the command mode. The first display is the main menu: You can scroll the commands with the arrow keys. The currently active command blinks; select the desired command with the ENT key. When a menu is on the display, either the first command or the currently valid setting blinks. The CL key takes the HMI38 back to the display mode. 7 HMI38 Operating Manual U063en-2.1 5.1.3. Selecting and scaling the analogue outputs 5.1.3.1. · Selecting the output Select Mode in the main menu and Analog outputs in the Mode menu: · Select Mode 1V / 5V. The current settings for channel 1 are displayed: · · If the settings are correct, press ENT. If you need to change the settings, press CL: - the lower limit starts blinking - acknowledge the lower limit with ENT or change it with the nu- the upper limit starts blinking - acknowledge the upper limit with ENT or change it with the numeric keys, then press ENT meric keys, then press ENT · When channel 1 has been set, the programme goes on to channel 2; the procedure is the same as with channel 1. NOTE The hardware has two basic voltage ranges: 0...1 V and 0...5 V. When scaling analogue outputs, please note that the relative accuracy of the output may become too low if only a very small part of either range is used to output a quantity with a wide measurement range. 5.1.3.2. · Selecting and scaling the analogue output quantities Select Mode in the main menu and Analog outputs in the Mode menu: · Select Scale. The quantity and scaling for channel 1 are displayed: 8 U063en-2.1 HMI38 Operating Manual · · If the settings are correct, press ENT. If you need to change the settings, press CL: - the quantity (RHn, Tn, Tdn, xn, an, Twn; n = 1 or 2) starts blink- the lower limit starts blinking - acknowledge the lower limit with ENT or give a new value using - the upper limit starts blinking - acknowledge the upper limit with ENT or give a new value using the numeric keypad and press ENT the numeric keypad and press ENT ing; change it with the arrow keys and acknowledged with the ENT key · After channel 1 has been set the settings of channel 2 appear on the display; follow the procedure described above for channel 1. 5.1.4. Setting the serial line parameters 5.1.4.1. · Turning the serial interface echo ON/OFF Select More in the main menu, More in the More menu and Echo in the second More menu. · Use the arrow keys to select the right alternative and press ENT. Serial bus settings Select Seri in the main menu; the currently valid serial interface settings are displayed: 5.1.4.2. · · · If the settings are correct, press ENT; the programme returns to the display mode. If you need to change the settings, press CL: 9 HMI38 Operating Manual U063en-2.1 · Select the parameter to be changed with the arrow keys and ENT key. - Selecting baud rate: - Selecting parity: - Selecting data bits: - Selecting stop bits: - Full duplex/half duplex: NOTE The serial bus settings become effective only after power off/on or the serial line command RESET. 5.1.4.3. Setting the instrument address Address is used when more than one instrument is connected to one serial bus; this enables communication with one instrument at a time. · Select More in the Main menu and then Addr in the More menu; the following appears on the display: · · Change the address by entering a new value and pressing ENT. Pressing ENT returns the programme to the More menu. 10 U063en-2.1 HMI38 Operating Manual · Pressing CL returns the programme to display mode and leaves the address unchanged. Selecting the output units Select More in the Main menu and Unit in the More menu: 5.1.4.4. · · Use the arrow keys to select the right alternative and press ENT. RH T Td a x Tw metric %RH °C °C g/m3 g/kg °C non-metric %RH °F °F gr/ft3 gr/lb °F 5.1.5. Setting the output mode The output modes only affect output through the serial interface: the instrument accepts all display/keypad commands irrespective of which serial output mode it is in. The HMI38 has three serial output modes: RUN, STOP and POLL. In the RUN mode the instrument outputs measurements automatically through the serial interface to a PC or a peripheral. The only command that can be given through the serial interface is S (stop), which ends the RUN mode. In the STOP mode serial commands are given to the instrument. Measurements can be output only by giving command SEND. The POLL mode is used when more than one instrument is connected to the same serial bus; a single instrument can be addressed and communicated with. When the connection to one instrument is opened in the POLL mode, this instrument goes into STOP mode and can then accept commands normally. Closing the connection returns the instrument to POLL mode. In POLL mode the instrument outputs measurements only when requested (command SEND aa). If the user has forgotten the address of the instrument, it can be checked using display/keypad commands. 11 HMI38 Operating Manual U063en-2.1 5.1.5.1. · Setting the serial interface operation mode Select Mode in the main menu; the following appears on the display: · Select Serial: · The currently valid setting blinks. Select the desired mode with the arrow keys and press ENT. After this the programme returns to the previous Menu. If you select the Run mode, the currently valid output interval appears on the display (with number and unit blinking): · If required, change the output interval setting as follows: · · · · · · press CL the number starts blinking if you need to change the interval, enter the new interval; otherwise press ENT the unit (seconds, minutes or hours) starts blinking if necessary, change the unit with the arrow keys and acknowledge it with ENT after this the programme returns to the previous menu 5.1.6. Others 5.1.6.1. Setting the measurement integration time Lengthening of the measurement integration time filters out any stray changes in the output: the instrument calculates the average of the number of measurement cycles defined by the user. · Select More in the main menu, More in the More menu and Mtim in the second More menu: 12 U063en-2.1 HMI38 Operating Manual · · Pressing ENT returns the programme to the previous menu without changing the integration time. If you need to change the integration time, enter the new time (4...255) and press ENT. 5.1.6.2. Setting the measurement integration filter If the integration filter is set on, the output reading is an average of four last measurements. · Select More in the main menu, More in the More menu and Filt in the second More menu: · Choose the correct alternative (Filter on/off) with arrow keys and press ENT. Setting the pressure for mixing ratio and wet bulb temperature calculations 5.1.6.3. The atmospheric pressure has an effect on mixing ratio and on wet bulb temperature. To achieve accurate calculations, the instrument needs to take the ambient pressure into account. · Select More in the main menu: · Select Pres: · · Pressing ENT returns the programme to the previous menu without changing the pressure reading. If you need to change the pressure, enter the new value and press ENT. 13 HMI38 Operating Manual U063en-2.1 5.1.6.4. · Setting the date Select More in the main menu; select Date in the More menu: · · If the date is correct, acknowledge it by pressing ENT; this takes the programme back to the More menu. If you need to change the date, press CL. Enter the new date in the order the digits blink (year-month-day) and press ENT. Press ENT again to return to the previous menu. If there is no need to change the date, press CL. Setting the time Select More in the main menu; select Time in the More menu: 5.1.6.5. · · · If the time is correct, acknowledge it by pressing ENT; this takes the programme back to the More menu. If you need to change the time, press CL. Enter the new time in the order the numbers blink and press ENT. Press ENT again to return to the previous menu. If there is no need to change the time, press CL. NOTE As the HMI38 does not have a real-time clock with a backup battery, the date and time settings do not stay in the memory during power-off. 5.1.6.6. Setting the automatic shutdown You can set the HMI38 to switch the power off automatically if no button is pressed for a certain time. · Select More in the main menu; select More in the first More menu and then again in the second More menu: · Press ENT and select the correct alternative (on/off) for the power-off mode with the arrow keys, then press ENT. 14 U063en-2.1 HMI38 Operating Manual · If you choose On, the current power-off time appears. If required, change the time setting as follows: · · · · · · press CL the number starts blinking if you need to change the time, enter the new time; otherwise press ENT the unit (seconds, minutes or hours) starts blinking if required, change the unit with the arrow keys and acknowledge it with ENT after this the programme returns to Main menu NOTE Auto power-off is not operational during data logging and calibration procedures. 15 HMI38 Operating Manual U063en-2.1 5.2. Serial commands Appendix 1 contains more detailed descriptions of the serial commands. The following chapters include only the most commonly used command sequences. You can interrupt any serial command while giving it by pressing ESC. In the commands means carriage return. 5.2.1. Analogue output commands 5.2.1.1. Setting the analogue outputs AMODE a.aaa b.bbb c.ccc d.ddd a.aaa b.bbb c.ccc d.ddd = = = = lower voltage limit of channel 1 upper voltage limit of channel 1 lower voltage limit of channel 2 upper voltage limit of channel 2 Sets the voltage scale of the analogue outputs on channels 1 and 2 (anything between 0...5 V). NOTE The hardware has two basic voltage ranges: 0...1 V and 0...5 V. When scaling analogue outputs, please note that the relative accuracy of the output may become too low if only a very small part of either range is used to output a quantity with a wide measurement range. Examples: Voltage output on channel 1 is set to 0...1 V and that on channel 2 is set to 2...5 V: >AMODE 0 1 2 5 Ch1 0.000 ... 1.000 V Ch2 2.000 ... 5.000 V The current settings are checked by entering AMODE without parameters >AMODE Ch1 0.000 ... Ch2 2.000 ... 1.000 V 5.000 V 16 U063en-2.1 HMI38 Operating Manual 5.2.1.2. Selecting and scaling the analogue output quantities ASEL xxx yyy xxx = yyy = quantity of channel 1 (RHn, Tn, Tdn, An, Xn or Twn) quantity of channel 2 (RHn, Tn, Tdn, An, Xn or Twn) (n = 1 or 2) Examples: Relative humidity of probe 1 is output on channel 1 and temperature of probe 2 on channel 2; the temperature range is scaled to be 0...100 °C: >ASEL Ch1 ( Ch1 ( Ch2 ( Ch2 ( > RH1 T2 RH1 ) lo RH1 ) hi T2 ) lo T2 ) hi 0.000 %RH ? 100.000 %RH ? -40.000 'C ? 160.000 'C ? 0 100 After entering ASEL without parameters the instrument outputs its current settings >ASEL Ch1 ( Ch1 ( Ch2 ( Ch2 ( > RH1 ) RH1 ) T2 ) T2 ) lo hi lo hi 0.000 %RH ? 100.000 %RH ? 0.000 'C ? 100.000 'C ? 5.2.1.3. Scaling the analogue outputs ASCL Scales the outputs selected on channels 1 and 2 (almost the same as ASEL but for scaling only). Example: Scaling relative humidity on the range of 0...100 %RH and temperature -40...+160 °C >ASCL Ch1 ( Ch1 ( Ch2 ( Ch2 ( > RH1 ) RH1 ) T2 ) T2 ) lo hi lo hi 20.000 %RH 90.000 %RH 0.000 'C 100.000 'C ? ? ? ? 0 100 -40 160 17 HMI38 Operating Manual U063en-2.1 5.2.2. Output via the serial bus 5.2.2.1. Starting the measurement output R Starts the measurement outputting of to peripheral devices (RUN mode); the only command that can be used is S (stop). The output format can be changed with command FORM (see appendix 1). 5.2.2.2. Stopping the measurement output S Ends the RUN mode; after this command all other commands can be used. 5.2.2.3. Outputting the reading once SEND in STOP mode or SEND aa in POLL mode aa = address of the transmitter when more than one instrument is connected to a serial bus (0...99) The output format can be changed with command FORM (see appendix 1). 5.2.2.4. Setting the output interval for the RUN state INTV xxx yyy xxx = yyy = output interval (0...255) unit (s, min or h) Sets the output interval for RUN mode and command R. If the interval is set to zero (s, min or h), the output interval will be determined by the frequency of measurements only. Example: Changing output interval to 10 minutes >INTV 10 min Output intrv. : 10 min 18 U063en-2.1 HMI38 Operating Manual 5.2.2.5. Serial bus settings SERI b p d s x b p d s x = = = = = bauds (300, 600, 1200, 2400, 4800, 9600) parity (n = none, e = even, o = odd) data bits (7 or 8) stop bits (1 or 2) duplex (H = half, F = full) Examples: Giving new settings >SERI O H 4800 O 7 1 HDX >SERI 600 N 8 2 F 600 N 8 2 FDX changing parity and duplex only changing all parameters NOTE New settings are effective only after switching the instrument off/on or after the serial command RESET has been given. If half-duplex setting is used with RS 485 bus, it will automatically turn the echo off. Even then the ECHO command can indicate that echo is on. 5.2.2.6. Selecting the output units UNIT x x = m(etric units) n(on-metric units) metric %RH °C °C g/m3 g/kg °C non-metric %RH °F °F gr/ft3 gr/lb °F RH T Td a x Tw 19 HMI38 Operating Manual U063en-2.1 5.2.2.7. Setting the address ADDR aa aa = address (0...99) Example: The HMI38 is given address 99 >ADDR Address : 0? 99 5.2.2.8. Resetting the HMI38 RESET 5.2.3. Operating the HMI38 via the serial bus Setting the serial interface mode SMODE xxxx xxxx = STOP, RUN or POLL measurements output only by command, all commands can be used outputting automatically, only command S can be used measurements output only with command SEND. In STOP mode: In RUN mode: In POLL mode: When in POLL mode, the output mode is changed as follows: OPEN aa SMODE xxxx aa = xxxx = address of the transmitter STOP, RUN or POLL The OPEN command sets the bus temporarily in STOP mode so that the SMODE command can be given. Example: >SMODE STOP Serial mode : STOP setting STOP mode 20 U063en-2.1 HMI38 Operating Manual 5.2.3.1. OPEN & CLOSE OPEN nn nn = address of the transmitter (0...99) CLOSE In STOP mode: In POLL mode: OPEN has no effect, CLOSE sets the serial bus temporarily to the POLL mode OPEN sets the serial bus temporarily to STOP mode; CLOSE sets the bus back to POLL mode The temporary mode changes are not stored in the memory of the transmitter; after reset the bus is in its original mode. When more than one instrument is connected to the same serial bus, the POLL mode enables communication with an individual instrument. Example: Transmitter 2 is temperature calibrated (currently in POLL mode) >OPEN 2 this line is not visible on the screen HMI 2 line opened for operator commands >CT ... >CLOSE line closed calibration procedure 21 HMI38 Operating Manual U063en-2.1 6. DATA LOGGING The HMI38 has two data logging modes: the CONTINUOUS mode, i.e. automatic logging which can store up to 254 readings from both probes and the CATCH mode, i.e. manual logging with which the user can store up to 127 readings from both probes. The user can choose the logging interval and starting time of the logging when using the CONTINUOUS mode, and in the CATCH mode he can store readings at any given moment by pushing the button ENT. The HMI38 stores the measured relative humidity and temperature values and when the stored data is transferred to a computer or peripheral through the serial bus, it calculates the other four quantities ­ dewpoint temperature, mixing ratio, absolute humidity and wet bulb temperature ­ from them. NOTE The CATCH mode is available only in units that have the software version 2.01 or more. You can easily check the version by reading the sticker on back of the device (SV2 indicates software version 2.01 or more). Activate logging with either display/keypad or serial line commands. The logged data is output to serial line. In outputting the values for mixing ratio and wet bulb temperature, the currently valid pressure setting is used. NOTE 1 To save battery, the analogue outputs cannot be used when data logging is on. NOTE 2 When the HMI38 is powered from the battery and the logging memory becomes full, the instrument automatically turns itself off. 22 U063en-2.1 HMI38 Operating Manual 6.1. Logging using display/keypad commands 6.1.1. Start/stop data logging in the CONTINUOUS mode NOTE The HMI38 has no battery operated real-time clock. Give current date and time settings manually after power-on (see Chapter 5.1.6.5); this way, correct time and date indications are stored with each reading. To start data logging: · Select Logg in the main menu. The LOGG menu is displayed: · Select Start and in the START menu, select Continuous: · The current delay (time before logging starts) and interval (time between sequential data storings) settings appear on the display with the current delay blinking: · Press ENT to acknowledge the current delay time setting. To change the setting press CL. Enter the new time and press ENT, then choose the correct time unit (s, min, h) with the arrow keys and press ENT. Acknowledge or change the time interval the same way. After you have set the time interval, the data logging starts and the logging status appears on the display. The HMI38 displays the logging status and measurements alternately: 23 HMI38 Operating Manual U063en-2.1 NOTE If the HMI38 has not output previous logging data, text Logged data is not transferred appears on the display. A new logging starts only after the old data has been transferred. To enable new logging, give command Print-Display or Print-Serial interface. To stop data logging: · Press CL, select Logg in the main menu and then Stop in the LOGG menu. Data logging ends. The current status of the logging can be checked by selecting Status in the LOGG menu. 6.1.2. Start/stop data logging in the CATCH mode NOTE The HMI38 has no battery operated real-time clock. Give current date and time settings manually after power-on (see Chapter 5.1.6.5); this way, correct time and date indications are stored with each reading. To start data logging in the CATCH mode: · Select Logg in the main menu. The LOGG menu is displayed: · Select Start in the LOGG menu and then Catch: · The measurement readings appear on the display alternately with the following display: 24 U063en-2.1 HMI38 Operating Manual · You can now store readings at any given moment by pressing ENT while the readings are on the display. The text DATA STORED appears to inform you that the readings as well as the time of measurement were correctly stored in the HMI38 memory: · · Press ENT to return to the display showing the measurement readings. Note that to save battery life, you can turn the HMI38 off while not storing readings and then turn it on again to continue. However, in this case remember to enter the correct date and time each time you turn the instrument on as it does not have a real-time clock. You can store max. 127 readings from both probes. To stop data logging, select Logg in the main menu and then Stop in the LOGG menu. Data logging ends. 6.1.3. Outputting the logged data to the serial line · Select Logg in the main menu and Print in the LOGG menu. Select Serial interface: The following appears: The HMI38 outputs the logged data to the serial line: > Data logging is ended Delay to start : 0s Interval : 10 min First data stored: 1994-10-18 13:45:55 Number of loggings : 1 18.1 15.7 23.5 23.0 -2.1 -4.4 3.0 3.2 3.2 2.7 11.3 10.6 The factory format for the data output is: RH1 T1 RH2 T2 Td1 a1 Td2 a2 x1 x2 Tw1 Tw2 25 HMI38 Operating Manual U063en-2.1 You can change the format with serial line command LFORM and pause the output by pressing CL. If you wish to continue, press ENT; if you wish to stop the outputting completely, press CL: The HMI38 stores the logged data in the memory until a new data logging starts. 6.1.4. Outputting the logged data to the display · Select Logg in the main menu and Print in the LOGG menu. Select Display: · The first logging point stored appears on the display, e.g.: · The first number from the left on the first line (in this example, 1) indicates which logging point is currently being observed. The second number from the left on the first line (in this example, 69) tells you how many logging points are stored in the HMI38 memory. Other numbers indicate the time and date of the measurement. Press ENT and the readings of the first logging point appear on the second line of the display, e.g.: · · The abbreviation of the measurement quantity and the number of the probe appear on the left of the second line. If you wish to see the readings of other measurement quantities or the readings of the second probe (if connected), you can scroll them with buttons s or t, for example: · Press the button CL to move on to the following logging point. When the readings are not on the display, you can select any logging point for observation with buttons s or t. You can stop outputting the data by pressing twice the button CL. · The HMI38 stores the logged data in the memory until a new data logging starts. 26 U063en-2.1 HMI38 Operating Manual 6.2. Logging using serial line commands (CONTINUOUS mode) See Appendix 1 for a description of the format of the serial line commands. 6.2.1. Data logging LOG xxx aa bbb cc ddd xxx aa bbb cc ddd Examples: · start logging and continue with intervals of 10 minutes: >log on 10 min Data logging is ON Delay to start : Interval : First data stored: Number of loggings = = = = = functional mode: ON, OFF or P(rint) logging start delay delay unit (h, min, s) logging interval interval unit (h, min, s) 0s 10 min 0000-00-00 00:00:00 : 0 · start logging after five hours and continue with intervals of 30 minutes: >log on 5 h 30 min Waiting for the start of logging Delay to start : 5h Interval : 30 min First data stored: ????-??-?? ??:??:?? Number of loggings : 0 · end logging: >log off Data logging is ended Delay to start : 0s Interval : 10 min First data stored: 1994-10-18 13:45:55 Number of loggings : 1 · output the logged data (defined by LFORM command): >log p Data logging is ended Delay to start : 0s Interval : 10 min First data stored: 1994-10-18 13:45:55 Number of loggings : 1 18.1 15.7 23.5 23.0 -2.1 -4.4 3.0 3.2 3.2 2.7 11.3 10.6 27 HMI38 Operating Manual U063en-2.1 6.2.1.1. Setting the output format of the logged data LFORM zzz...zzz or LFORM xxx...xxx ? zzz...zzz xxx...xxx zzz...zzz = = old format (blank = factory format) new format · Select output variables by variable name and the number of the measuring probe: RHn Tn Tdn An Xn TWn = relative humidity = temperature = dewpoint temperature = absolute humidity = mixing ratio = wet bulb temperature where n is the number of the probe (1 or 2) · · Give any other text you wish to appear in the output between inverted commas ("). Give the number format in front of the output variable as: ., for example: 3.2 or 2.1 etc. (max. 9.9). · Give the unit as: Un · where n specifies the number of characters (max. 5), e.g. U3. other parameters are: \n or #n \r or #r \t or #t \nnn or #nnn TIME DATE line feed carriage return horizontal tabulation or ASCII-code nnn current time (HH:MM:SS) current date (YYYY-MM-DD) 28 U063en-2.1 HMI38 Operating Manual · If the input line is too short, continue the command parameter entry in the following line as: & . Some examples: command: output: command: output: command: output: command: output: >LFORM "rh1: " 3.2 RH1 rh1: 29.62 %RH >LFORM "RH: " 2.2 RH: 29.62% RH1 " %RH" \r \n U1 \r \n >LFORM date " " time #t RH1 #t T1 #r #n 1994-09-29 10:02:15 29.6 24.3 >LFORM "rh: " 2.2 RH2 " " U3 & " t: " 2.2 T2 " " U2 #r #n (line continued) rh: 29.62 %RH t: 25.35 'C The factory format can be recovered with command: >LFORM * Please, note that you can use the LFORM command for changing the format of the output of logged data only; otherwise it is functionally similar to the FORM command. 29 HMI38 Operating Manual U063en-2.1 7. CALIBRATION As the HMI38 indicators and their probes have been fully calibrated at the factory, there should be no immediate need for a recalibration. Calibrate them only if you have a reason to believe that the adjustments have changed. The adjustments of the temperature measurement channels and analogue output channels are particularly stable and in normal circumstances, need not be recalibrated. Perform humidity calibration for the probes at least once a year. 7.1. Humidity calibration Perform the humidity calibration of the probes by adjusting the calibration potentiometers in the probe bodies (see Appendices 4, 5 or 6). Perform a twopoint calibration with the HMK15 or HMK13B calibrator or send the probe to Vaisala. We recommend recalibration at least once a year. Please, note also that the probe needs recalibration every time the HUMICAP ® humidity sensor is changed. 7.1.1. Calibration procedure · Leave the calibrator, the HMI38 and the probe for at least 4 hours in the same space so that their temperatures have time to equalize. Remove the filter cap on the probe. Insert the probe into a measurement hole of the LiCl chamber in the calibrator. Wait at least 10 minutes, check the humidity reading from the HMI38 and adjust the reading to the correct value using the DRY potentiometer in the probe body. Insert the probe into a measurement hole of the NaCl chamber in the calibrator. Wait at least 10 minutes and adjust the humidity reading using the WET potentiometer. Table 7.1 Greenspan's calibration table 15 59 * 75.6 20 68 11.3 75.5 25 77 11.3 75.3 30 86 11.3 75.1 35 95 11.3 74.9 · · · · Temperature °C °F LiCl %RH NaCl %RH *) If the LiCl solution is used or stored at temperatures below +18 °C (+64 °F), the equilibrium humidity of the salt solution changes permanently. · As the DRY and WET adjustments may affect each other, check again the humidity reading in the LiCl chamber (wait for 10 minutes after inserting the probe into the measurement hole). If the reading is not