User manual HANNA INSTRUMENTS HI 98143

[. . . ] These instruments are in compliance with the FUNCTIONAL DESCRIPTION Range pH EC SPECIFICATIONS 0 to 14 pH 0 to 10 mS/cm ±0. 5% f. s. ±2% f. s Accuracy(@ 25°C/77°F) pH EC Typical EMC Deviation pH EC PRELIMINARY EXAMINATION Remove the instrument from the packing material and examine it carefully. If any damage has occurred during shipment, immediately notify your Dealer or the nearest Hanna Customer Service Center. Note: Conserve all packing material until the instrument has been observed to function correctly. [. . . ] The glass bulb at the end of the electrode is sensitive to electrostatic discharges. The metal band at the end of the EC probe is sensitive to electrostatic discharges. During operation, ESD wrist straps should be worn to avoid possible damage to the electrode by electrostatic discharges. Any variation introduced by the user to the supplied equipment may degrade the instrument's EMC performance. To avoid electrical shock, do not use this instrument when voltages at the measurement surface exceed 24 Vac or 60 Vdc. To avoid damages or burns, do not perform any measurement in microwave ovens. IST98143 07/05 Hanna Instruments reserves the right to modify the design, construction and appearance of its products without advance notice. CONNECTIONS pH ELECTRODE CONNECTION · Connect the pH electrode to the BNC connector (#3) and the Matching pin to the PM terminal. EC PROBE CONNECTION · Probe wires are colour coded for an easy installation: Terminal Probe Wire Color EC probe #1 Green EC probe #2 White EC probe #3 Red EC probe #4 Blue Temperature sensor #1 Brown Temperature sensor #2 Grey Shield Yellow-green POWER CONNECTION · Connect a 2-wire cable to the 12-24 Vdc power source, while paying careful attention to its polarity. OUTPUT CONNECTION · Connect a 2-wire cable from the pH output terminals (#8) to the pH receiver, and another 2-wire cable from the EC output terminals to the EC receiver, while paying attention to the polarity. Outputs vary proportionally to the measured pH and EC values in the range of 0-1 V (for HI 98143-01), 0-4 V (for HI 98143-04) or 4-20 mA (for HI 98143-20 and HI 98143-22). · For continuous flow-thru measurements, the probes can be easily installed in any standard ½" pipe tee. Use Teflon ® tape between the probe and the pipe to ensure a leak free joint. Take care not to overtighten it, as excessive pressures can cause probe damage. CALIBRATION For better accuracy, frequent calibration of the instrument is recommended. Calibration should also be performed whenever the pH electrode is replaced, after testing aggressive chemicals or at least once a month. OUTPUT HI 98143-01 and HI 98143-04: The input is isolated from output and power supply. The outputs aren't isolated from power supply. pH CALIBRATION Pour small quantities of pH 7. 0 (HI 7007) and pH 4. 0 (HI 7004) or pH 10. 0 (HI 7010) solutions into two clean beakers. Use pH 4. 0 solution as second calibration buffer if you are measuring acidic samples, while pH 10. 0 solution is recommended for alkaline solutions. · Connect a multimeter to the pH output terminals and set it to voltage (HI 98143-01 and HI 98143-04) or current (HI 98143-20 and HI 98143-22) readings. Rinse and immerse pH electrode and matching pin (if used) in pH 7. 0 buffer. · Adjust the pH offset calibration trimmer with a small screwdriver until the multimeter displays: 500 mV for HI 98143-01 2. 00 V for HI 98143-04 12. 00 mA for HI 98143-20 and HI 98143-22. · Rinse and immerse pH electrode and matching pin (if used) in pH 4. 0 (or pH 10. 0) buffer and stir gently. · Wait a couple of minutes and then adjust the pH slope trimmer until the multimeter shows the value of the second buffer: model pH 4 buffer pH 10 buffer HI 98143-01 286 mV 714 mV HI 98143-04 1. 14 V 2. 86 V HI 98143-20 8. 57 mA 15. 43 mA HI 98143-22 8. 57 mA 15. 43 mA The pH calibration is now complete. Note: To prevent any damage, disconnect the pH electrode before turning the meter off. HI 98143-20: The output must be feed by an external power supply, which can be the same used for the meter. If an additional power supply is used to feed the inputs, follow the second connection schema. [. . . ] Connect probes, power supply and receiving devices to the HI 98143 as explained in the previous section. Remove the protective cap from the pH electrode and immerse it at least 4 cm into the sample. If the matching pin is used, dip it together with the pH electrode; if it is not used, connect the matching pin terminal to the reference with a jumper wire. Immerse the EC probe in the sample. Matching Pin Reference EC PROBE MAINTENANCE · When calibration can no longer be achieved, remove conductivity probe from the system for maintenance. [. . . ]