HI 21/HI 22 Series Wall-mounted, Microprocessor-based Process pH/mV Meters Instruction Manual Dear Customer, Thank you for choosing a Hanna Product. Please read this instruction manual carefully before using the instrument. It will provide you with the necessary information for the correct use of the instrument, as well as a precise idea of its versatility. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst.com tech@hannainst.com. These instruments are in compliance with the directives. TABLE OF CONTENTS PRELIMINARY EXAMINATION . . . . . . . . . . . . . . . . . . 4 GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . 4 FUNCTIONAL DESCRIPTION . . . . . . . . . . . . . . . . . . 6 MECHANICAL DIMENSIONS . . . . . . . . . . . . . . . . . . 7 SPECIFICATIONS HI 21 & HI 22 . . . . . . . . . . . . . . . 8 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 MODELS The models HI 21XYZ are pH controllers, while the models HI 22XYZ are ORP controllers. HI 21111 HI 21211 HI 21221 HI 21222 HI 21523 pH Controller with single setpoint, ON/OFF control, analog output pH Controller with dual setpoint, ON/OFF control, analog output pH Controller with dual setpoint, proportional and ON/OFF control, analog output pH Controller with dual setpoint, proportional and ON/OFF control, RS485 output pH Controller with control through analog output, PID control, analog and RS485 output ORP Controller with single setpoint, ON/OFF control, analog output ORP Controller with single setpoint, proportional and ON/OFF control, RS485 output SETUP MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 CONTROL MODE . . . . . . . . . . . . . . . . . . . . . . . . . 17 IDLE MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 ANALOG OUTPUT . . . . . . . . . . . . . . . . . . . . . . . . 26 RS485 COMMUNICATION & DATA LOGGING . . . . 28 CALIBRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 LAST CALIBRATION DATA . . . . . . . . . . . . . . . . . . . . 48 START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 FAULT CONDITIONS AND SELFTEST PROCEDURES . . 52 pH VALUES AT VARIOUS TEMPERATURES . . . . . . . . . 56 ELECTRODE CONDITIONING AND MAINTENANCE . . 57 TAKING REDOX MEASUREMENTS . . . . . . . . . . . . . . 61 ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 CE DECLARATION OF CONFORMITY . . . . . . . . . . . 70 HI 22111 HI 22122 © 2002 Hanna Instruments All rights are reserved. Reproduction in whole or in part is prohibited without the written consent of the copyright owner, Hanna Instruments Inc., 584 Park East Drive, Woonsocket, Rhode Island, 02895 , USA. 2 3 PRELIMINARY EXAMINATION Remove the instrument from the packing material and examine it carefully to make sure that no damage has occurred during shipping. If there is any noticeable damage, notify your Dealer or the nearest Hanna Customer Service Center immediately. Note Save all packing materials until you are sure that the instrument functions correctly. Any damaged or defective items must be returned in their original packing materials together with the supplied accessories. GENERAL DESCRIPTION The product is a real time microprocessor-based pH/ORP controller. It provides accurate measurements, flexible ON/OFF proportional or PID control capabilities and dual , alarm signals. The system is composed of a case inside which the signal conversion circuitry, the microprocessor circuitry and the output power drivers are contained. MAIN FEATURES OF DIFFERENT MODELS · Display: large LCD with 4 ½ 13 mm digits and 3 ½ 7.7 mm digits. · LEDs: three (HI 22) or four (HI 21) LEDs are provided for signaling the energizing of relay 1 (a yellow LED), relay 2 (a yellow LED in HI 21 Series only) and alarm relays (a green and a red LED). · Relays: Electromechanical type, working through NO, COM and NC contacts; 1 or 2 output relays for acid or base dosage; 1 output relay for alarm condition. · RS485 isolated communication link. · Calibration and Setup procedures allowed only through an unlock password. · Calibration: for HI 21 Series in 1, 2 or 3 points with buffers 4.01, 7.01 and 10.01 pH (25 °C); for HI 22 Series in 1 or 2 points at 0, 350 and 1900 mV. · Temperature compensation of the HANNA standard buffers (for HI 21 Series only). · Temperature compensation of the pH reading (for HI 21 Series only). · Manual temperature setting when the temperature probe is not inserted or temperature exceeds the upper range. · Internally recorded last calibration data (non-volatile EEPROM memory): calibration date and time, pH offset, pH slopes, number of calibration points and correspondent pH values (for HI 21 Series only) or calibration date and time and the mV calibration points used (for HI 22 Series only). · Input: pH electrode with BNC connector. · ±5 VDC output for amplified electrodes (max 10 mA). · Output: - isolated 0-1 mA, 10 KW maximum load (optional); - isolated 0-20 mA, 750 W maximum load (optional); - isolated 4-20 mA, 750 W maximum load (optional); - isolated 0-5 VDC, 1 KW minimum load (optional); - isolated 1-5 VDC, 1 KW minimum load (optional); - isolated 0-10 VDC, 1 KW minimum load (optional). · Real time clock. 4 5 FUNCTIONAL DESCRIPTION FRONT PANEL CONNECTIONS PANEL 1. Liquid Crystal Display 2. LCD key exits from setup and calibration modes and reverts back to normal mode (in idle or control phases with the measurement on the display). In HI 21 series, during pH calibration, alternately displays pH buffer value or current temperature 3. CAL DATA key last calibration data viewing (enters and exits) 4. SETUP key enters setup mode 5. CAL key initiates and exits calibration mode 6. ñ key increases the blinking digit/letter by one when selecting a parameter. Advances forward while in last calibration data viewing mode. Increases the temperature setting when temperature probe is not inserted 7. ð key moves to the next digit/letter (circular buffer) when selecting a parameter. Same as ñ key during last calibration data viewing mode 8. ò key decreases the blinking digit/letter by one when selecting a parameter. Reverts backward while in last calibration data viewing mode. Decreases the temperature setting when temperature probe is not inserted 9. CFM key confirms current choice (and skips to the next item) 10. BNC Socket 11. LEDs 4-pin RS485 terminal (not for HI 21XY1 and HI 22XY1) Analog output (not for HI 21XY2 and HI 22XY2) Connections for Pt 100 temperature sensor ±5V power supply output Connection for Potential Matching Pin Connection for electrode reference Power supply input (1 Potential Earth, 2 Neutral, 3 Line) Alarm terminal (1 F.S. Closed, 2 COM, 3 F.S. Open) Relay 1 - first dosing terminal (not for HI 21523) - (1 Normally Open, 2 COM, 3 Normally Closed) 10. Relay 2 - second dosing terminal (HI 212XY models only) - (1 Normally Open, 2 COM, 3 Normally Closed) Unplug the meter before starting any electrical connections. 1. 2. 3. 4. 5. 6. 7. 8. 9. MECHANICAL DIMENSIONS FRONT VIEW BOTTOM VIEW 6 7 SPECIFICATIONS HI 21 & HI 22 Range 0.00 to 14.00 pH (HI 21 Series only) ±2000 mV (HI 22 Series only) -9.9 to 120.0 °C 0.01 pH (HI 21 Series only) 1 mV (HI 22 Series only) 0.1 °C ±0.02 pH (HI 21 Series only) ±2 mV (HI 22 Series only) ±0.5 °C ±0.05 pH (HI 21 Series only) ±4 mV (HI 22 Series only) ±1.0 °C 0 to 1 mA, 0 to 20 mA, 4 to 20 mA 0 to 5 VDC, 1 to 5 VDC, 0 to 10 VDC RS485 ±5V (for amplified electrodes) 230 ±10% VAC or 115 ±10% VAC, 50/60 Hz 15 VA 400 mA, 250V, FAST FUSE Electromechanical relay SPDT contact outputs, 5A-250 VAC, 5A - 30 VDC (resistive load) (HI 211YZ, HI 212YZ and HI 221YZ) Fuse protected: 5A, 250V FAST FUSE Electromechanical relay SPDT contact output, 5A - 250 VAC, 5A - 30 VDC (resistive load) Fuse protected: 5A, 250V FAST FUSE 0-50 °C; max 85% RH not condensing IP 54 221 x 181 x 86 mm (8.7 x 7.1 x 3.4'') approximately 1.4 Kg (3.1 lb.) INSTALLATION HI 21 and HI 22 offer a multitude of possibilities, from single and dual setpoints to ON/ OFF, proportional or PID dosage, isolated outputs with user-selectable zoom, bidirectional RS485, recorder outputs in mAmps and Volts. In addition, HI 21 and HI 22 are both equipped with the exclusive differential input. In a system with poor grounding, it is possible to have a ground current flowing through the reference junction. This can cause a rapid degradation of the electrode. The Hanna differential input reduces the likelihood of ground loops. See the diagram for a recommended installation. Resolution Accuracy (@20°C/68°F) Typical EMC Deviation Analog Output Digital Output Power Supply Input Power Supply Power Consumption Over Current Protection Relays 1 and 2 Alarm Relay Environment Protection Dimensions Weight 8 9 · Power Supply: Connect a 3-wire power cable to the terminal strip, while paying attention to the correct line (L), earth (PE) and neutral (N) terminal connections. Power: 115VAC - 100 mA / 230VAC - 50 mA. Line Contact: fused inside 400 mA. PE must be connected to ground; leakage current 1 mA. · Electrode: Connect the pH or ORP electrode to the BNC socket (#10 at page 6). To benefit from the differential input, connect the proper electrode wire (if available) or a cable with a potential matching pin (grounding bar) to the relevant terminal (#5 at page 7). SETUP MODE HI 21 and HI 22 offer a multitude of possibilities from ON/ OFF proportional or PID dosage to analog recorder output , and from alarm to selftest features. The Setup Mode allows the user to set all needed characteristics of the meter. The setup mode is entered by pressing SETUP and entering the password when the device is in idle or control mode. Generally speaking, if the password is not inserted the user can only view the setup parameters (except for password) without modifying them (and the device remains in control mode). An exception is certain setup items, or flags, which can activate special tasks when set and confirmed. Each setup parameter (or setup item) is assigned a twodigit setup code which is entered and displayed on the secondary LCD. The setup codes can be selected after password and CFM are pressed. When CFM is pressed, the current setup item is saved on EEPROM and the following item is displayed. Whenever LCD is pressed, the device reverts back to control mode. The same is true when CFM is pressed on the last setup item. The possible transitions in setup mode are the following: ENTERING THE PASSWORD · Press SETUP to enter the setup mode. The LCD will display "0000" on the upper part and "PAS" on the lower. The first digit of the upper part of the LCD will blink. Note When it is not possible to immerse the Potential Matching Pin together with the pH electrode in the solution, disable the differential input by connecting the Connection for Potential Matching Pin (#5 page 7) with the Connection for Electrode Reference (#6 on page 7) with a jumper wire. · Pt 100 Terminals: these contacts (#3 at page 7) connect the Pt 100 temperature sensor for automatic temperature compensation of pH measurement. In the case of shielded wire, connect the shield to pin 4. In the case of a 2-wire sensor connect the Pt 100 to pins 1 and 3, and short pins 2 and 3 with a jumper wire. If the Pt 100 has more than 2 wires, connect the two wires of one end to pins 2 and 3 (pin 2 is an auxiliary input to compensate for the cable resistance) and one wire from the other end to pin 1. Leave the fourth wire unconnected, if present. · Power Supply Output: these terminals provide +5V and 5V DC (max current: 10 mA) signals to supply power to amplified electrodes. All cables connected to the panel should end with cable lugs. · Enter the first digit of the password by the ñ or ò keys. Note 10 11 · Then confirm the displayed digit with ð and move to the next one. · When the whole password has been inserted, press CFM to confirm it. · After confirmation, the selected parameter is displayed. The user can scroll through the parameters by pressing CFM. In order to directly set another parameter, press SETUP again and enter the code or scroll to it by pressing CFM. The following table lists the setup codes along with the description of the specific setup items, their valid values and whether password is required to view that item ("PW" column): Code Valid Values 0 to 9999 Default 0000 PW no no no no no Note The default password is set at "0000". · The LCD will display "SET" on the upper part and "c.00" on the lower, allowing the user to edit setup parameters (see table below). · Enter the code of the parameter you want to set, using the arrow keys as per the password procedure above (e.g. 41). · Confirm the code by pressing CFM and the default or the previously memorized value will be displayed with the first digit blinking. 00 Fact ...