Thermo Fisher Scientific Alpha pH 2000 - Manual (Page 24)

7. Press the ENT key to return to the Measurement mode.
Note: If you entered the Calibration mode from the Setup mode, the controller
will return to the setup menu.
Note: If there is a calibration error the transmitter displays “ERR”. In
this case, press the
▲ and ▼ keys simultaneously (escape) to
restart the calibration beginning from step 1.
Note: When calibrating with manual temperature compensation, the
controller automatically changes from the preset process temperature
to the calibration temperature. After leaving the Calibration mode, the
controller switches back to the process temperature (for setting the
calibration temperature and the process temperature, see section 6.3).
5.3 ORP–mV Calibration
If controller is configured for ORP-mV measuring you can perform only a
one-point calibration.
meas
SETUP
HOLD
CAL
HOLD
M V
CAL
HOLD
M V
CAL
250 250
1. Enter Calibration mode as described in section 5.1. The display
should read “CAL ORP”.
Note: If the display reads “CAL PH”, see section 6.9 for procedures on
how to switch from pH to ORP-mV readings.
2. Place sensor in the ORP solution.
3. Press the ENT key to start calibration. The “ CAL ” indicator appears on
the display. The display shows the current mV output of the electrode
without any offset adjustment.
4. Press the
▲ or ▼ key to match the mV value to your exact reading.
5. Press the ENT key to confirm. The controller calculates the correction
factor and returns to the Measurement mode.