User manual HANNA INSTRUMENTS HI 991401

[. . . ] This warranty is limited to repair or replacement free of charge. 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. [. . . ] 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 voltages at the measurement surface exceed 24 VAC or 60 VDC. To avoid damages or burns, do not perform any measurement in microwave ovens. ISTR991401R1 05/03 OPERATIONAL GUIDE To turn the meter on Connect the pH electrode to the meter. Connect the 12VDC adapter to the meter and to the mains; the display will lit. Press and hold the MODE button for 23 seconds. All the used segments on the LCD will be visible for a few seconds. 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. Use the SET/HOLD button to change the temperature unit, and then press MODE button twice to return to normal measurement mode. To freeze the display Press and hold the SET/HOLD button for 2-3 seconds until HOLD appears on the secondary display. Press either button to return to normal mode. Taking measurements Immerse the electrode and the temperature probe in the solution to be tested. In order to ensure better accuracy, the electrode should not touch or stand close to the walls or bottom of the sample vessel. The pH value automatically compensated for temperature is shown on the primary LCD while the secondary LCD shows the temperature of the sample. The measurements should be taken when the stability symbol on the top left of the LCD disappears. Note: Measurements have to be taken with both probes (pHelectrode and temperature probe) immersed in the same vessel. To turn the meter off Press the MODE button while in normal measurement mode. OFF will appear on the lower part of the display. The display still lit, until the power supply is connected. 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. The CAL symbol on the LCD will disappear. The meter will be reset to the default calibration. [. . . ] Rinse the electrode thoroughly to eliminate cross-contamination. Place the electrode in the second buffer value (pH 4. 01 or 10. 01, or, if using NIST, pH 4. 01 or 9. 18). When the second buffer is recognized, the LCD will display OK for 1 second and the meter will return to the normal mode. Note: for storing calibration data in the non-volatile memory, turn the meter OFF and then ON again through the MODE button. [. . . ]