User manual HANNA INSTRUMENTS HI 8614L

[. . . ] GENERAL DESCRIPTION HI 8614 - HI 8614L (pH) and HI 8615 HI 8615L (ORP) are 2-wire water-resistant transmitters designed specially for long distance measurement of pH or ORP for use in industrial applications. Two versions are available: the standard HI 8614 or HI 8615 and HI 8614L or HI 8615L with an LCD. The LCD versions allow easy verification and monitoring of measured values and are easier to calibrate and maintain. The pH or ORP signal is transmitted in a 2wire current loop in the range of 4 to 20 mA. [. . . ] 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. 12 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°. PROBE" terminals (see page 6) depending on the temperature of the calibration solution. 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 °C · · 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 13 ORP CALIBRATION (HI8615 & HI8615L) Initial preparation: Disconnect the +ve supply cable from the "+VE LOOP" terminal and connect a 20 mA f. s. With HI 8615L the instrument display can be used during calibration without the need to connect the ammeter. 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). This sets the zero point for the transmitter. 20 70 HI SLOPE ADJUSTMENT OFFSET ADJUSTMENT mA · Connect the ORP electrode to the transmitter and immerse the tip of the electrode into a beaker of HI 7020 ORP calibration solution, and check that the ammeter reading lies between 13. 6 and 14. 2 mA or the instrument reading is between 200 and 275 mV at 25°C (HI 8615L). mA HI 7020 14 If the reading lies outside this range, adjust the slope adjustment trimmer on the transmitter for a reading just within this range. The unit is now calibrated. · SLOPE ADJUSTMENT OFFSET ADJUSTMENT A complete calibration of the transmitter module is advised periodically. This calibration procedure requires the HI 8427 or the HI 931001 pH and ORP simulator to simulate the ORP electrode. HI 8427 or HI 931001 produce a known signal into the system so that the faults of the system can be isolated. This is normal with electrodes and they will disappear when rinsed with water. During transport tiny bubbles of air may have formed inside the glass bulb. These bubbles can be removed by "shaking down" the electrode as you would 19 do with a glass thermometer. If the bulb and/or junction are dry, soak the electrode in HI70300 or HI 80300 Storage Solution for at least one hour. For refillable electrodes: If the fill solution (electrolyte) is more than 1 cm (½") below the fill hole, add HI 7082 or HI 8082 3, 5M KCl Electrolyte Solution for double junction or HI 7071 or HI 8071 3, 5M KCl+AgCl Electrolyte Solution for single junction electrodes. For a faster response unscrew the fill hole screw during measurements. For AmpHel electrodes: If the electrode does not respond to pH changes, the battery is run down and the electrode should be replaced. Immerse the tip (4 cm / 1½") in the sample and stir gently for approx. For a faster response and to avoid cross contamination of the samples, rinse the electrode tip with a few drops of the solution to be tested, before taking measurements. STORAGE To minimize clogging and assuring a quick response time, the glass bulb and the junction should be kept moist and not allowed to dry out. Replace the solution in the protective cap with a few drops of HI 70300 or HI 80300 Storage Solution or, in its absence, Filling Solution (HI 7071 or HI 8071 for single junction or HI 7082 or HI 8082 for double junction electrodes). [. . . ] Obtain a Returned Goods Authorization from the Customer Service department first and then return the instrument with the Authorization # included along with shipment costs prepaid. If the repair is not covered by the warranty, you will be notified of the charge for repair or replacement. When shipping any instrument, make sure it is properly packaged for complete protection. To validate your warranty, fill out and return the enclosed warranty card within 14 days from the date of purchase. [. . . ]