User manual HANNA INSTRUMENTS HI 98130

[. . . ] 100 hours after 8 minutes of non-use 163 x 40 x 26 mm (6. 4 x 1. 6 x 1. 0") 100 g (3. 5 oz. ) WARRANTY HI 98129 and HI 98130 are warranted for one year against defects in workmanship and materials when used for their intended purpose and maintained according to instructions. 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. [. . . ] 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. IST98129R4 07/05 OPERATIONAL GUIDE To turn the meter on and to check battery status Press and hold the /MODE button for 2-3 seconds. All the used segments on the LCD will be visible for a few seconds, followed by a percent indication of the remaining battery life (Eg. To change the temperature unit To change the temperature unit (from °C to °F), from measurement mode, press and hold the /MODE button until TEMP and the current temperature unit are displayed on the lower LCD (E. g. Use the SET/HOLD button to change the temperature unit, and then press the /MODE button twice to return to normal measuring mode. To freeze the display Press the SET/HOLD button for 2-3 seconds until HOLD appears on the secondary display. To turn the meter off Press the /MODE button while in normal measurement mode. Notes: · Before taking any measurement make sure the meter has been calibrated. · To clear a previous calibration, press the /MODE button after entering the calibration mode. The lower LCD will display ESC for 1 second and the meter will return to normal measurement mode. · If measurements are taken in different samples successively, rinse the probe thoroughly to eliminate cross-contamination; and after cleaning, rinse the probe with some of the sample to be measured. · Press the SET/HOLD button to change the buffer value. · Press the /MODE button to return to the normal measuring mode. Calibration procedure From measurement mode, press and hold the / MODE button until CAL is displayed on the lower LCD. The LCD will display pH 7. 01 USE or pH 6. 86 USE (if you have selected the NIST buffer set). For a single-point pH calibration, place the electrode in any buffer from the selected buffer set (eg. If using pH 4. 01 or pH 10. 01, the meter will display OK for 1 second and then return to the normal measuring mode. If using pH 7. 01, after recognition of the buffer the meter will ask for pH 4. 01 as second calibration point. Press the /MODE button to return to measurement mode or, if desired, proceed with the 2-point calibration as explained below. Note: It is always recommended to carry out a twopoint calibration for better accuracy. For a two-point pH calibration, place the electrode in pH 7. 01 (or 6. 86 if you have selected the NIST buffer set). The meter will recognize the buffer value and then display pH 4. 01 USE. [. . . ] Afterwards, rinse it thoroughly with tap water and recalibrate the meter. · The pH electrode can be easily replaced by using the supplied tool (HI 73128). Insert the tool into the electrode cavity as shown below. Once the top has been removed, carefully replace the 4 batteries located in the compartment while paying attention to their polarity. Replace the top, making sure that the gasket is properly seated in place, and tighten the screws to ensure a watertight seal. pH MEASUREMENTS & CALIBRATION Taking measurements Select the pH mode with the SET/HOLD button. [. . . ]