User manual HANNA INSTRUMENTS HI 9124

[. . . ] (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. (662) 619. 0708. 11 · Fax (662) 619. 0061 MAN9125R2 02/08 United Kingdom: Tel. (401) 765. 7500 · Fax (401) 765. 7575 For e-mail contacts and a complete list of Sales and Technical offices, please see www. hannainst. com. w w w. [. . . ] If the sample temperature is different from the temperature at which the pH electrode was kept, allow a few minutes for thermal equilibrium. To use the meter's Automatic Temperature Compensation feature, submerge the temperature probe into the sample as close to the electrode as possible and wait for a few minutes. If manual temperature compensation is desired the temperature probe must be disconnected from the instrument. The display will show the default temperature of 25 °C, or the last temperature set with the "°C" (or "°F") indicator blinking. The temperature can now be adjusted with the UP and DOWN arrow keys. ORP MEASUREMENTS (HI 9125 only) To perform ORP measurements, connect an optional ORP electrode (see "Accessories" section) to the meter and turn it ON. If necessary, enter the "mV" mode by pressing RANGE until the display changes to mV. 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. Replace temperature probe. Reading fluctuates up and down (noise). Clogged/dirty junction. 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". "WRONG CALIBRATION" is displayed during pH calibration procedure. 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. "Clr" message at start up. Contact your dealer or any Hanna Service Center. Perform pH calibration. 8 21 For refillable electrodes, if the refill solution (electrolyte) is more than 2½ cm (1") below the fill hole, add the appropriate Electrolyte Solution. MEASUREMENT Rinse the electrode tip with distilled water, immerse it 4 cm (1½") in the sample and stir gently for a few seconds. For a faster response and to avoid cross contamination of the samples, rinse the electrode tip with the solution to be tested, before taking any measurements. [. . . ] WAIT NOT READY blinking: buffer has been recognized, but reading is not stable. WRONG and WRONG blinking alternatively: wrong buffer, value not recognized. During calibration the instrument will display the pH buffer value at 25 °C. To replace the rechargeable batteries, follow the next steps: · Turn OFF the instrument. · Unscrew the screws from the bottom sides of the instrument. SETUP MENU The instrument allows the user to configure several parameters through the Setup Menu. [. . . ]