User manual HANNA INSTRUMENTS HI 981406

[. . . ] 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. If the repair is not covered by warranty, you will be notified of the charges incurred. [. . . ] 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. IS981406R2 06/02 OPERATIONAL GUIDE pH and ORP Electrodes Connection In order to protect the instrument against vapors and humidity, the BNC connectors are shielded behind waterproof sheaths. · Slide the protective sheaths down. Connect the pH and the ORP electrodes to the BNC connectors and then slide the protective sheaths back up to the casing. For maximum waterproof protection, make sure the connectors are completely covered. · Do not be alarmed if white crystals appear around the electrode protective cap. This is normal with pH and ORP electrodes and they dissolve when rinsed with water. Taking Measurements · Turn the meter on by connecting the 12VDC power adapter to the meter and the mains. · Remove the protective cap from the pH and ORP electrodes. · Immerse the tips (4cm/1½") of pH, ORP electrodes and ground probe in the sample. In order not to affect the accuracy of measurements, electrodes should not touch or stand close to the vessel's walls or bottom. · The 2 LCDs will show the pH and ORP values. Adjusting the Setpoint With HI981406 you can select your own setpoints and be alerted through two independent pH and ORP alarm LEDs when an abnormal situation arises. · Unscrew and remove the rear panel and gasket seal to access the MEASURE/SET switches and move them to the left (SET). · With a small screwdriver adjust the setpoint trimmers to display the desired value shown on the LCD. You can choose to adjust one or both setpoints at once inside the following ranges: pH: from 5. 0 to 9. 0 ORP: from 350 to 850 mV The pH LED blinks when the pH is higher than the setpoint. The ORP LED blinks when the ORP is lower than the setpoint. pH CALIBRATION The instrument must be recalibrated whenever: a) The pH electrode is cleaned or replaced. [. . . ] The pH calibration is now complete. CE DECLARATION OF CONFORMITY · Move the switches back to MEASURE and secure the rear panel properly replacing the gasket. Electrode Maintenance · When not in use, rinse the electrodes with water to minimize contamination and store them with a few drops of storage (HI 70300) solution in the protective cap. Always replace the protective cap when not in use. DO NOT USE DISTILLED OR DEIONIZED WATER FOR STORAGE PURPOSES. · If the electrodes have been left dry, soak the tips in a storage (HI 70300) solution overnight to reactivate them. [. . . ]