User manual HANNA INSTRUMENTS HI 931700

[. . . ] 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. [. . . ] 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. Oxidizing pre-treatment: immerse the electrode for a few minutes in HI 7092. If pre-treatment is not performed, the electrode will take a significantly longer time to respond. When working with electrodes of the refilling type, the electrolyte used for filling must be constantly kept at an adequate level (no less than 2½ centimeters from the filling hole) and topped up if necessary with HI 7071 refilling solution. 17 16 In the event that measurements are performed with solutions containing sulfides or proteins, the cleaning of the diaphragm of the reference electrode must be performed (see page 21, "Cleaning Procedure"). In order to have a correct functioning of the ORP electrode, immerse it into HI 7020 and measure the response; the obtained value should be within 200 and 275 mV. After this functional test, it is suggested to wash the electrode thoroughly with water and proceed to the oxidizing or reducing pre-treatment before taking measurements. When not in use, the electrode tip should be kept moist and far from any type of mechanical stress which might cause damage. [. . . ] Large currents can disturb the calibration of the electrode for many hours. For these reasons high humidity environments, short circuits and static discharges are detrimental for a stable pH reading. The pH electrode's life also depends on the temperature. If constantly used at high temperatures, the electrode life is drastically reduced. 24 25 SUGGESTED INSTALLATIONS SHORT DISTANCE, INDOOR INSTALLATION Due to the high impedance of the pH and ORP electrode's glass membrane (usually more than 100 M), a very high grade of insulation is required. A dry environment is needed in order to obtain a level of insulation not lower than 1012 . MAXIMUM 10 METERS MAXIMUM 50 METERS WET ENVIRONMENT RELATIVE HUMIDITY UP TO 100% pH METER WITH AN AmpHel ® ELECTRODE MEASUREMENTS CAN BE TAKEN FROM DISTANCES UP TO 50 METERS (165 FEET) DRY ENVIRONMENT LESS THAN 80% RELATIVE HUMIDITY AmpHel® electrodes have a micro-amplifier in the electrode cap to boost the signal, drastically reducing susceptibility to noise and drift. With all of the components sealed in the electrode body, moisture up to 100% RH will not effect the signal. pH METER WITH CONVENTIONAL ELECTRODES MEASUREMENTS CAN BE TAKEN FROM DISTANCES UP TO 10 METERS (33 FEET) This type of connection is very delicate and requires constant attention to maintain proper operating conditions. [. . . ]