Thermo Fisher Scientific Alpha pH 500 - Manual (Page 15)

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5.3 Relative mV Calibration
1. From the ORP MEAS mode, press CAL key.
CAL indicator appears at top of LCD. Primary
display shows relative mV reading and
secondary display shows absolute mV value.
2. NOTE: If you have never calibrated relative mV
or if the transmitter has been reset, the value
shown in the primary display is the same as the
absolute mV value.
3. Press ▲ or ▼ keys to enter the relative mV
value that matches your desired reading (only
the readings in the primary display changes).
4. Press ENTER key to confirm. Transmitter will
now display the offset in the readings.
5. Press ENTER key to return to MEAS mode.
5.4 Temperature Calibration
Temperature calibration is available only in the pH measurement mode and when
ATC probe is available.
Calibrate temperature probe only if temperature value displayed on transmitter is
different from that of a calibrated thermometer. Please refer to section 6.3.1 for
further information.
CAL
HOLD
READY
R.mV
CAL
HOLD
READY
CAL
HOLD
READY
R.mV
R.mV