User manual HANNA INSTRUMENTS HI 981404

[. . . ] Damages due to accident, misuse, tampering or lack of prescribed maintenance are not covered. If service is required, contact the dealer from whom you purchased the instrument. If under warranty, report the model number, date of purchase, serial number and the nature of the failure. [. . . ] 11. Liquid Crystal Displays pH 4. 0/10. 0 calibration trimmer pH 7. 0 calibration trimmer BNC connector Protective sheath HI 1286 pH electrode HI 1283 grounding probe HI 7632 TDS probe or HI 7634 EC probe 12 VDC power adapter Power supply connector EC/TDS calibration trimmer Probe HI 981405 only Range Resolution Accuracy (@ 25°C/77°F) Temp. Compensation Calibration Probe Recommendations for Users Before using this product, make sure that it is entirely suitable for the environment in which it is used. Operation of this instrument in residential areas could cause unacceptable interferences to radio and TV equipment. The glass bulb at the end of the electrode 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 voltage at the measurement surface exceeds 24 VAC or 60 VDC. To avoid damage or burns, do not perform any measurement in microwave ovens. OPERATIONAL GUIDE pH ELECTRODE CONNECTION In order to protect the instrument against vapors and humidity, the BNC connector is shielded behind a waterproof sheath. Connect the pH electrode to the BNC connector and then slide the protective sheath back up all the way up to the casing. For maximum waterproof protection, make sure the connector is completely covered. · 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. pH ELECTRODE MAINTENANCE · When not in use, rinse the electrode with water to minimize contamination and store it with a few drops of storage (HI 70300) or pH7 (HI 7007) solution in the protective cap. · If the electrode has been left dry, soak the tip in a storage (HI 70300) or pH7 (HI 7007) solution overnight to reactivate it. · To minimize clogging and provide longer life for the pH electrode, it is recommended to clean it at least once a month. Immerse the tip of the electrode in HI 7061 cleaning solution for half an hour and then rinse it with tap water. Note: the electrode should be submerged approximately 4 cm (1½") in the solution. · Adjust the right hand trimmer (pH 7) with the calibration screwdriver until the LCD shows pH 7. 0. · Rinse and immerse the pH electrode in pH 4. 0 buffer and stir gently. · Wait a couple of minutes and then adjust the left hand trimmer (pH 4) until the LCD shows the value of the second buffer. [. . . ] Any initial variation in readings may be due to the pH electrode conditioning and EC/TDS temperature compensation. Allow the readings to stabilize. EC/TDS PROBE MAINTENANCE The following cleaning procedure is recommended at least once a month: · Immerse the tip of the electrode in HI 7061 Cleaning Solution for half an hour. · If a more thorough cleaning is required, brush the metal pins with very fine sandpaper. [. . . ]