Hanna Instruments HI 110 - Manual (Page 10)

10
RELATIVE mV MEASUREMENTS (HI 111 and HI 113)
• Press RANGE until “rEL” message will be displayed on the secondary LCD line
for about one second and “mV” tag will blink. After one second the
temperature will be displayed on the secondary LCD.
The reading displayed by the instrument is equal to the difference between
the current mV input value and relative mV offset established in the relative
mV calibration.
TEMPERATURE MEASUREMENTS
Connect the HI 7669/2Wtemperature probe to the appropriate
socket and turn the instrument on.
Immerse the temperatureprobeinto the sample and allow
the reading on the secondary LCD to stabilize.
MEMORY FUNCTION
Press and hold down MEM. The last reading will appear
on the LCD along with “MEM” tag until MEM is released.
Press MR and the previously memorized reading will be
displayed on the LCD with “MEM” tag.
pH CALIBRATION
Calibrate the instrument frequently, especially if high accuracy is required.
The instrument should be recalibrated:
• Whenever the pH electrode is replaced.
• At least once a week.
• After testing aggressive chemicals.
• If “CAL” “INTV” tags are blinking during measurement.
Every time you calibrate the instrument use fresh buffers and perform an
electrode Cleaning Procedure (see page 30).
MR
mV
MEM
pH
MEM