User manual HANNA INSTRUMENTS HI 9125

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[. . . ] SALES AND TECHNICAL SERVICE CONTACTS Australia: Tel. (03) 9769. 0666 · Fax (03) 9769. 0699 Instruction Manual China: Tel. (10) 88570068 · Fax (10) 88570060 HI 9124 HI 9125 Portable Waterproof pH Meters Egypt: Tel. & Fax (02) 2758. 683 Germany: Tel. [. . . ] 7 Submerge the ORP electrode 4cm (1½") into the sample to be tested and wait a few minutes for the reading to stabilize. Measurements within the ±699. 9 mV range are displayed with 0. 1 mV resolution, while outside this range the resolution automatically switches to 1 mV. For accurate ORP measurements, the surface of the electrode must be clean and smooth. Pretreatment solutions are available to condition the electrode and improve its response time (see "Accessories" section). Notes: · When the reading is out of range, the display will flash the closest full-scale value. TROUBLESHOOTING GUIDE SYMPTOMS Slow reponse/excessive drift. SOLUTION The electrode needs to be cleaned. Follow the cleaning procedure on page 20. Refill with fresh electrolyte (refillable electrodes only). Check that the sample is within measurable range. Soak electrode in HI 70300 storage solution for at least 30 minutes. Replace temperature probe. Reading fluctuates up and down (noise). Clogged/dirty junction. Low electrolyte level (refillable electrodes only). Reading out of range. D isplay shows blinking full scale value. mV scale out of range. D ry membrane or dry junction. · If using pH electrode while in mV mode, the meter will measure the mV generated by the pH electrode. MEM & MR FUNCTIONS The instrument allows the user to store the current measurement (pH and temperature, or mV and temperature) into internal memory by pressing the MEM key. The MEMORIZE tag lights up on display. D isplay shows blinking "°C" or "°F". Meter does not work with temperature probe. Meter fails to calibrate or gives faulty readings. "WRONG CALIBRATION" is displayed during pH calibration procedure. Meter shuts off. Broken temperature probe. Low battery level. Recharge batteries. Broken pH electrode. Replace electrode. Wrong or contaminated buffer. Check that buffer solution is correct and fresh. Stored value can be recalled by pressing MR: the display will show the value as long as the button is pressed, and the MEMORIZE tag. Dead batteries; Auto-off feature is enabled: in this case, meter shuts off after 20 min of non-use. Loaded default pH calibration values. Recharge batteries; Press ON/OFF. "E r0, E r1, E r2" message at start up. [. . . ] To enter the Menu mode, while in measurement mode, press and hold the SETUP key for about 5 seconds. Once the menu is entered, each parameter can be changed by using the arrow keys; then pressing the CFM key will confirm the value and scroll to the next parameter. Acoustic signal: On (default) or Off · Insert four new 1. 2V AAA 1000 mAh NiMH rechargeable batteries in the battery compartment while paying attention to the correct polarity. Make sure that the "Battery type" switch is in NiMH position. [. . . ]

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