Hanna Instruments HI 253 Instruction Manual

Contents

7OPERATIONAL GUIDEPOWER CONNECTIONPlug the 12 VDC adapter into the power supply socket.Note: This instrument uses non volatile memory to retain the pH, mV,temperature calibrations and all other settings, even when unplugged.Note: Make sure a fuse protects the main line.ELECTRODE AND PROBE CONNECTIONSFor pH or ORP measurements connect an electrode with internal reference tothe BNC connector on the back of the instrument.For electrodes with a separate reference connect the electrodeís BNC to the BNCconnector and the reference electrode plug to the reference socket.For temperature measurements and automatic temperature compensationconnect the temperature probe to the appropriate socket.INSTRUMENT START-UPï Turn the instrument on by pressing the ON/OFF switch.ï All LCD tags are displayed and a beep is sounded whilethe instrument performs a self test.pH MEASUREMENTSMake sure the instrument has been calibrated before takingpH measurements.ï Submerge the electrode tip and the temperature probeapproximately 4 cm (1Ωî) into the sample to be testedand stir gently. Allow time for the electrode to stabilize.ï The pH is displayed on the primary LCD and the temperature on thesecondary LCD.ï If the reading is out of range, the closest full-scale value will be displayedblinking on the primary LCD.pHCCCALCFMREADY 123BUFWRONGLOG mV pH TIME% DATE INTVBUFFER pHppmpHC