User manual HANNA INSTRUMENTS HI 98143-20

[. . . ] Any defective item must be returned in its original packing. POWER CONNECTION · Connect a 2-wire cable to the 12÷24 VDC power source paying attention to its polarity. GENERAL DESCRIPTION HI 98143 is a pH/EC transmitter specially designed for long distance measurements of pH and Electrical Conductivity in industrial applications. The pH and EC signals are isolated to avoid any interference with the receiving device. Probes connectors, power supply, contacts and calibration trimmers are easy to reach directly on the front panel. For in-line applications the recommended pH electrode is the HI1001 while the conductivity probe is the HI3001. [. . . ] Reproduction in whole or in part is prohibited without the written consent of the copyright owner, Hanna Instruments Inc. , Woonsocket, Rhode Island, 02895 , USA. Hanna Instruments reserves the right to modify the design, construction and appearance of its products without advance notice. OPERATIONAL GUIDE · To minimize thermal drifts due to extreme temperature fluctuations and in case of outdoors measurements, it is recommended to protect the transmitter with a proper casing. Connect pH electrode, EC probe, power supply and receiving devices to the transmitter by following the previous instructions. Remove the protective cap from the pH electrode and immerse it into the sample, at least 4 cm. When using the matching pin, dip it together with the pH electrode; otherwise, connect its terminal to the reference with a jumper wire. 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. SPECIFICATIONS Range Accuracy (@25°C/77°F) Typical EMC Deviation Output Temp. Compensation Automatic from 0 to 60°C with ß=2%/°C Manual with two trimmers Calibration Offset: ±2pH; Slope: 80÷110% pH EC Slope: ±20% HI1001 pH electrode (suggested) and pH Probes HI1283 Potential Matching Pins (not included) HI3001 (not included) with cell constant 2. 1 ECProbe Power supply External, 12 to 24 VDC (not included) pH EC pH EC pH EC pH EC 0. 0 - 14. 0 0 - 10 mS ±0. 5% f. s ±2% f. s. 4÷20 mA (isolated) 4÷20 mA (isolated) · · · · · Dimensions Weight 160 x 105 x 31mm (6. 2 x 4. 1 x 1. 2") 280 g (9. 9 oz) · Rinse the pH electrode and the grounding probe, and immerse them in pH 4. 0 (or pH 10. 0) buffer. Stir gently and wait for a couple of minutes. · Adjust the pH Slope Trimmer until the multimeter shows the corresponding mA value of the second buffer (8. 57 mA for pH 4 and 15. 43 mA for pH 10 solution). Note: to prevent damage to the electrode, disconnect the pH electrode before turning the meter off. MAINTENANCE pH ELECTRODE MAINTENANCE · Do not be alarmed if white crystals appear around the electrode protective cap. This is normal with pH electrodes and they dissolve when rinsed with water. · When not in use, rinse the electrode with tap water to minimize contamination and store it with a few drops of storage (HI 70300) or pH 7 (HI 7007) solution in the protective cap. DO NOT USE DISTILLED OR DEIONIZED WATER FOR STORAGE PURPOSES. · If the electrode has been left dry, soak the tip in a storage (HI 70300) or pH 7 (HI 7007) solution for at least one hour to reactivate it. · To minimize clogging and provide longer life for the pH electrode, it is recommended to clean it monthly. Immerse the tip of the electrode in HI 7061 for one hour and then rinse it with tap water. CE DECLARATION OF CONFORMITY CALIBRATION For better accuracy, frequent calibration of the instrument is recommended. In addition, the instrument must be recalibrated for pH: a) Whenever the electrode is replaced. b) At least once a month. The pH calibration is now complete. EC CALIBRATION · Connect a multimeter to the EC output terminals and set it to Voltage readings. · The HI3001 EC probe must be dry. · Adjust the EC Offset Calibration Trimmer with a small screwdriver until the multimeter displays 4. 00 mA. EC PROBE MAINTENANCE · Remove the conductivity probe and rinse it with tap water. [. . . ] 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. ACCESSORIES HI 1283 HI 1001 HI 3001 Stainless steel grounding probe with 2 m (6. 6') cable "flow-thru" double junction pH electrode with 3 m (6. 6') cable and BNC connector "flow-thru" 4-platinum ring EC probe with 3 m (6. 6') cable and temperature sensor · Pour a small quantity of 5. 00 mS/cm calibration solution in a beaker. · Immerse completely the tip of the EC probe in the conductivity solution. · Tap the probe and stir it to ensure that no air bubbles are trapped inside the sleeve. [. . . ]