User manual HANNA INSTRUMENTS HI 8614

[. . . ] Instruction Manual HI 8614 - HI 8614L HI HI 8615 - HI 8615L pH and ORP ransmitters Transmitters pH pH INDIC ITTER SM & TRAN L HI 8614OR AT These Instruments are in Compliance with the CE Directives http://www. hannainst. com Dear Customer, Thank you for choosing 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 the directives EN 50081-1 and EN 50082-1. TABLE OF CONTENTS Preliminary Examination . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Dip the HI 7004 electrode and the temperature probe into pH 4. 01 (or 10. 01) calibration buffer solution, shake briefly and wait for a few minutes for reading to stabilize. Adjust the slope trimmer until the ammeter reads 8. 58 mA or the display shows "4. 01" at 25°C. For other buffer temperatures, refer to page 11 for the appropriate mA / pH reading (HI 8614L). · SLOPE ADJUSTMENT OFFSET ADJUSTMENT mA If you are using pH 10. 01 buffer solution adjust the slope trimmer until the ammeter read 15. 43 mA at 25°C (77°F) or the value indicated at page 11. mA FOR HI 8614L ONLY: The Display Module is factory calibrated, so that the LCD display results are referred to the 4-20 mA loop current (e. g. LCD displays 0. 00 pH when loop current is 4. 00 mA and displays 14. 00 pH when current is 20. 00 mA). 9 Under normal application, adjustment on this module may not be necessary. If routine check is required, the following procedures shall be performed. · Follow the procedure at page 7 to perform calibration on the transmitter module (using a ammeter). Simulate a 4. 00 mA loop current for the transmitter (i. e. pH 0. 00 as Electrode input) and check for display reading. Simulate a 20. 00 mA loop current for the transmitter (i. e. pH 14. 00 as Electrode input) and check for display reading. · · Note: when the instrument is used in conjunction with the Hanna indicator HI 8510T or controllers HI 8710T, HI 8711T, the calibration can also be performed on the indicator/controller. In this case slight calibration adjustment can be made on the indicator/ controller even if the whole system calibration is advised, always starting from the transmitter. 10 pH CALIBRATION WITH FIXED TEMPERATURE COMPENSATION (HI 8614 & HI 8614L only) · Take the temperature of the buffer solutions using a Checktemp or a thermometer with a resolution of at least 1°. Connect the appropriate resistor to the "TEMP. PROBE" terminals (see page 6) depending on the temperature of the calibration solution. TEMP. PROBE °C · +VE LOOP -VE LOOP INPUT · Follow the procedure as outlined in the calibration with automatic temperature compensation and use the thermometer reading to adjust the trimmer until the ammeter reads the value according to the following table. 4. 01 pH Buffer 7. 01 pH Buffer 10. 01 pH Buffer Temperature °C 0 5 10 15 20 25 30 35 40 45 50 55 60 °F 32 41 50 59 68 77 86 95 104 113 122 131 140 pH 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 mA 8. 576 8. 565 8. 565 8. 565 8. 565 8. 576 8. 587 8. 599 8. 610 8. 622 8. 633 8. 645 8. 667 pH 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 mA 12. 137 12. 103 12. 069 12. 034 12. 023 12. 000 11. 989 11. 977 11. 966 11. 966 11. 966 11. 966 11. 966 pH 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 mA 15. 789 15. 697 15. 629 15. 560 15. 491 15. 434 15. 377 15. 331 15. 285 15. 251 15. 217 15. 182 15. 159 11 ORP CALIBRATION (HI8615 & HI8615L) Initial preparation: Disconnect the +ve supply cable from the "+VE LOOP" terminal and connect a 20 mA f. s. ammeter between the +ve cable and the "+VE LOOP" terminal. With HI 8615L the instrument display can be used during calibration without the need to connect the ammeter. In this case the values are directly expressed in mV units. Pour a small quantity of HI 7020 ORP solution into a beaker. Procedure: · Connect the shorting BNC connector to the ORP transmitter. · Adjust the OFFSET ADJUSTMENT trimmer on the module for a display of 12 mA on the ammeter or 0 mV on the instrument display (HI 8615L only). +1000 mV at Electrode input) and check display reading. +VE LOOP -VE LOOP mV INPUT HI931001 pH/mV Calibrator 15 Please note: -1000 0 1000 350 200 275 1 mV mV mV mV mV mV mV = = = = = = = 4 12 20 14. 8 13. 6 14. 2 12. 008 mA mA mA mA mA mA mA Note: when the meter is used in conjunction with the Hanna indicator HI 8512T, or the controller HI 8720T, the calibration can also be performed on the indicator/controller. In this case slight adjustment can be made on the indicator/controller even if the whole system calibration is advised, always starting from the transmitter. 16 ELECTRODE CONDITIONING AND MAINTENANCE Reference Filling Hole Reference Filling Hole Sensitive Wire Reference Wire Reference Junction Glass Bulb Plastic Body pH Electrode Reference Wire Sensitive Wire Reference Junction Glass Bulb Glass Body pH Electrode Reference Wire Reference Junction Platinum or Gold tip Reference Wire Reference Junction Platinum or Gold tip Glass Body ORP Electrode Plastic Body ORP Electrode PREPARATION Remove the protective cap. DO NOT BE ALARMED IF ANY SALT DEPOSITS ARE PRESENT. [. . . ] The lower the temperature, the higher the resistance. It takes longer time for the reading to stabilize if the resistance is higher. In addition, the response time will suffer to a greater degree at temperatures below 10°C. 2x109 -10 1x109 -10 -10 2x108 1x108 -10 2x107 -10 1x107 -10 -20 -20 0 +10+20 +30+40 +50+60+70 +80+90 ° C Since the resistance of the pH electrode is in the range of 200 Mohm, the current across the membrane is in the pico Ampere range. 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. [. . . ]