Instruction Manual HI 931700 HI 932700 Panel - Mounted pH - ORP Indicators Controllers http://www.hannainst.com These Instruments are in Compliance with the CE Directives Dear Customer, Thank you for chosing a Hanna Instruments Product. Please read this instruction manual carefully before using the instrument. This manual will provide you with all the necessary information for the correct use of the instrument, as well as a precise idea of its versatility in a wide range of applications. These instruments are in compliance with directives EN 50081-1 and 50082-1. TABLE OF CONTENTS Preliminary Examination ............................ 3 General Description ................................... 3 Functional Description HI 931700 .............. 5 Functional Description HI 932700 .............. 6 Mechanical Dimensions ............................. 8 Specifications HI 931700 ........................... 9 Specifications HI 932700 ........................... 9 Initial Preparation ..................................... 10 Operational Guide .................................... 12 Calibration ................................................ 13 Taking Redox Measurements ................... 16 Electrode Conditioning and Maintenance . 19 Temperature-Resistance Correlation for HANNA pH Sensitive Glass ..................... 24 Suggested Installations ............................ 26 Accessories .............................................. 28 Warranty ................................................... 34 CE Declaration of Conformity .................. 35 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. Note: Save all packing materials until you are sure that the instrument functions correctly. All defective items must be returned in the original packing materials together with the supplied accessories. GENERAL DESCRIPTION HI 931700 and HI 932700 respectively are pH and ORP panel-mounted indicators and controllers designed for simplicity of use in a wide range of industrial applications. The models are panel mount designed with membrane keypads on the front panel and a 12x30 mm LCD display. Connections to the electrodes, power supply, contacts and recorders are made via the plug-in terminal blocks on the rear panel. The instruments are equipped with a BNC socket and accept input direct from pH or ORP electrode. Other features include: recorder output 0 to 20 mA or 4 to 20 mA as indicated; LED indicators which identify whether the controller is in operation mode or selection mode. ISO 9000 Certified Company since 1992 2 3 FUNCTIONAL DESCRIPTION HI 931700 FRONT PANEL REAR PANEL HI 931700 HI 931700 pH CONTROLLER pH SET ON OFFSET SLOPE SET SET MEA Keypad SET To display and to set the working point of pH dosage 1. Power Supply 15-24 VDC: 115 or 220 VAC: P1 !Not Connected Earth P2 ! Negative Neutral P3 ! Positive Live 2. Acid/Base Dosage Selection (see page 10); 3. Connections for dosing pump to dose either acid or base products. These contacts act only as a switch for the power to the drive; 4. Recorder output (M1 ! + mA output, M2 ! - mA output); 5. BNC for pH electrode; 6. Connection for Potential Matching Pin; 7. Connection for Electrode Reference. MEASURE To set HI 931700 to the measurement mode Trimmers OFFSET SLOPE SET For Offset Calibration For Slope Calibration To adjust the Set Point Leds SET ON To show that acidic or alkaline dosage is in progress 4 Note: Be sure your main line is protected by a fuse. 5 FUNCTIONAL DESCRIPTION HI 932700 FRONT PANEL REAR PANEL HI 932700 HI 932700 ORP CONTROLLER mV SET ON SLOPE SET SET MEA Keypad SET To display and to set the working point of ORP dosage MEASURE To set HI 932700 to the measurement mode 1. Power Supply 15-24 VDC: P1 ! Not Connected P2 ! Negative P3 ! Positive 115 or 220 VAC: Earth Neutral Live 2. Oxidant/Reductant dosage selection (see page 10); 3. Connections for dosing pump to dose either oxidant or reductant products. These contacts act only as a switch for the power to the drive; 4. Recorder output (M1 ! + mA output, M2 ! - mA output); 5. BNC for ORP electrode; 6. Connection for Potential Matching Pin; 7. Connection for Electrode Reference. Note: Be sure your main line is protected by a fuse. Trimmers SLOPE SET For Slope Calibration To adjust the Set Point Leds SET ON To show that oxidant or reductant dosage is in progress 6 7 MECHANICAL DIMENSIONS SPECIFICATIONS HI 931700 HI 931700 Range Resolution Accuracy Typical EMC Deviation Installation Cat. Input Calibration 0.00 to 14.00 pH 0.01 pH ±0.02 pH ±0.02 pH II 1012 Ohm Offset: ±2 pH through Offset trimmer Slope: 80 to 110% through slope trimmer 4-digit LCD plus graphic symbols 0 to 20mA or 4 to 20mA (not isolated) Isolated, 2A, max 240 V, resistive load, 1.000.000 strokes 115±10% or 230±10% VAC, 50/60 Hz or 15-24VDC (according to the model) -10 to 50°C (14 to 122°F) 130 g (4.58 oz) Front view of the panel-mounted unit. Dimensions show the cutout size for the installation and also the outside dimensions of the panel. 73mm 2.87" 79mm 3.11" Readout Recorder Output Set Point Relay Power Supply 42mm 1.65" 49mm 1.93" Environment Weight Side view of the panel-mounted unit. 0.25/4mm 0.01/0.160" ADJUSTABLE LOCATION BRACKET SPECIFICATIONS HI 932700 HI 932700 Range -1000 to +1000 mV 1 mV ±5 mV ±2 mV II 1012 Ohm Slope: 90 to 110% through slope trimmer 4-digit LCD plus graphic symbols 0 to 20 mA or 4 to 20 mA (not isolated) Isolated, 2 A, max 240 V, resistive load, 1.000.000 strokes 115±10% or 230±10% VAC, 50/60 Hz or 15-24VDC (according to the model) -10 to 50°C (14 to 122°F) 130 g (4.58 oz) Resolution Accuracy Typical EMC Deviation Installation Cat. 79mm 3.11" 76mm 3" 95mm MIN 3.74" Input Calibration Readout Recorder Output Set Point Relay Power Supply Environment Weight Adjustable location brackets (supplied with the meter) allow the controller to slide into the cutout and will hold the unit securely in place. 95 mm (3.74") is the minimum amount of space required to install the controller with the cables connected. 8 9 INITIAL PREPARATION Connect a 3-wire (115 or 230VAC versions) or 2-wire (15-24VDC version) power cable to the terminal strip paying attention to the correct live, earth and neutral (115 or 230VAC version) or positive and negative (15-24VDC version) terminal connections. · Connect the pH or ORP electrode to the BNC connector marked "INPUT ELECTRODE". · 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 (# 6 at pages 5 and 7). Note: When it is not possible to immerse the Potential Matching Pin together with the electrode in the solution, disable the differential input by connecting the connection for Potential Matching Pin with the connection for Electrode Reference with a jumper wire. · Recorder Terminals: these contacts are the output terminals for connection to a recorder. The output is from 0 to 20 mA or 4 to 20 mA as indicated and is proportional to the measured pH or ORP value. Note: Calibrate the external recorder to be in accordance with the display reading (consult recorder manufacturer instruction manual). Earth P1 · · Neutral P2 P3 Live M1 M2 HI 931700 and HI 932700 are single set point dosing controllers for dosing respectively acid or alkaline / reducing or oxidizing products. HI 931700: If you plan to dose acid (e.g. in hexavalent chromium reduction), make an open circuit between terminals marked "S1" and "S2" on the rear panel (description on page 3). If you plan to dose base (e.g. in cyanide oxidation), short terminals "S1" and "S2". HI 932700: If you plan to dose oxidants (e.g. in cyanide oxidation), make a short circuit between terminals marked "S1" and "S2" on the rear panel (description at page 5). If you plan to dose reductants (e.g. in hexavalent chromium reduction), make an open circuit across terminals "S1" and "S2". · Set Contacts: these contacts (maximum 2A, 220 V) are used for connection to dosing pumps. Use HI 931700 for dosage of acidic or alkaline reagents, and HI 932700 for dosage of oxidizing or reducing reagents. Both units act as a switch for power to the control element (e.g. pump). Note: all external cables connected to the rear panel should end with cable lugs. S1 S2 S1 S2 S1 S2 S1 S2 C1 C2 10 11 OPERATIONAL GUIDE The setting of the various parameters are made via the front panel keys and trimmers. When each key is pressed the LED is lighted indicating to the user that the function is in operation. Make sure that the meters and electrodes are calibrated before operating the instruments (see page 13). To set the working point of pH or ORP dosage, press the "SET" key. The display will show the set value for the dosage. CALIBRATION Make sure the meter is in the measurement mode (MEASURE LED light is on) before starting the calibration procedure. SLOPE pH SET SET MEA Use a small screwdriver to adjust the "SET" trimmer until the desired set value is displayed. SLOPE pH SET SET MEA After setting the pH or ORP value immerse the electrode in the test solution and press the "MEASURE" key. The actual pH or ORP value of the test solution is displayed. When the chemicals are dosed, the "SET ON" LED will be lit. SLOPE SET SET MEA SET ON OFFSET SLOPE SET SET MEA HI 931700: Note the temperature of the buffer solution using a thermometer. Immerse the electrode and the Potential Matching Pin in pH 7.01 buffer solution (HI 7007). Note: When it is not possible to immerse the Potential Matching Pin together with the electrode in the solution, disable the differential input by connecting the connection for Potential Matching Pin with the connection for Electrode Reference with a jumper wire. Shake briefly and wait one minute before adjusting the Offset trimmer to display pH 7.01 on the LCD if the temperature of the buffer solution is at 25°C. If the buffer solution temperature is not 25°C, refer to Table 1 for the appropriate buffer value to adjust at the noted temperature. Rinse the electrode and the Potential Matching Pin thoroughly in water and immerse them in 4.01pH (HI7004) or 10.01pH (HI7010) buffer solution. Shake briefly and wait one minute before adjusting the slope trimmer to display pH 4.01 (or 10.01) on the LCD if the temperature of the buffer solution is at 25°C, if not refer to Table 1 for appropriate buffer value at the corresponding temperature. SET ON OFFSET pH SLOPE SET SET MEA SET ON OFFSET pH SLOPE SET SET MEA 12 13 Temperature Buffer Buffer Buffer Buffer Buffer °C °F pH 4.01 pH 6.86 pH 7.01 pH 9.18 pH 10.01 HI 932700: Immerse the electrode and the Potential Matching Pin in HI 7020 ORP solution. Note: When it is not possible to immerse the Potential Matching Pin together with the electrode in the solution, disable the differential input by connecting the connection for Potential Matching Pin with the connection for Electrode Reference with a jumper wire. Adjust the slope trimmer until an ORP value from 200 mV and 275 mV is displayed. SET ON 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 32 41 50 59 68 77 86 95 104 113 122 131 140 149 158 167 176 185 194 203 4.01 4.00 4.00 4.00 4.00 4.01 4.02 4.03 4.04 4.05 4.06 4.07 4.09 4.11 4.12 4.14 4.16 4.17 4.19 4.20 6.98 6.95 6.92 6.90 6.88 6.86 6.85 6.84 6.84 6.83 6.83 6.84 6.84 6.85 6.85 6.86 6.86 6.87 6.88 6.89 7.13 7.10 7.07 7.04 7.03 7.01 7.00 6.99 6.98 6.98 6.98 6.98 6.98 6.99 6.99 7.00 7.01 7.02 7.03 7.04 9.46 9.39 9.33 9.27 9.22 9.18 9.14 9.10 9.07 9.04 9.01 8.99 8.97 8.95 8.93 8.91 8.89 8.87 8.85 8.83 10.32 10.24 10.18 10.12 10.06 10.01 9.96 9.92 9.88 9.85 9.82 9.79 9.77 9.76 9.75 9.74 9.73 9.74 9.75 9.76 OFFSET SLOPE mV SET SET MEA Table 1 Note: For better accuracy, calibrate the meter using a calibration solution at the same temperature of the liquid to be measured. If calibration is performed at a different temperature, the error is approx. 0.0035pH for each 1°C difference multiplied by the difference between the pH of the measured liquid and pH7; e.g. meter calibrated at 25°C/measured liquid: pH 4 / liquid temperature: 35°C; the error is approx.: 0.0035x(35-25)x(7-4) = 0.10 pH. The error is added or subtracted to the reading according to table 2. Temp.above 25°C Temp. below 25°C pH above 7 pH below 7 Subtract Add Add Subtract The calibration is now complete and the instrument is ready for use. Table 2 14 15 TAKING REDOX MEASUREMENTS Redox measurements allow the quantification of the oxidizing or reducing power of a solution, and are commonly expressed in mV. Oxidation may be defined as the process during which a molecule (or an ion) loses electrons and reduction as the process by which electrons are gained. Oxidation is always coupled tog ...