Hanna Instruments HI 253 - Manual (Page 7)

7
O P E R A T I O N A L G U I D E
POWER CONNECTION
Plug 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 CONNECTIONS
For pH or ORP measurements connect an electrode with internal reference to
the BNC connector on the back of the instrument.
For electrodes with a separate reference connect the electrode’s BNC to the BNC
connector and the reference electrode plug to the reference socket.
For temperature measurements and automatic temperature compensation
connect the temperature probe to the appropriate socket.
INSTRUMENT START-UP
• Turn the instrument on by pressing the ON/OFF switch.
• All LCD tags are displayed and a beep is sounded while
the instrument performs a self test.
pH MEASUREMENTS
Make sure the instrument has been calibrated before taking
pH measurements.
• Submerge the electrode tip and the temperature probe
approximately 4 cm (1½”) into the sample to be tested
and stir gently. Allow time for the electrode to stabilize.
• The pH is displayed on the primary LCD and the temperature on the
secondary LCD.
• If the reading is out of range, the closest full-scale value will be displayed
blinking on the primary LCD.
pH
C
C
CAL
CFM
READY 1
2
3
BUF WRONG
LOG mV pH TIME % DATE INTV
BUFFER pH
ppm
pH
C