Thermo Fisher Scientific Alpha pH 2000D - Manual (Page 17)

5 Calibration Mode
You can access the Calibration mode directly from the Measurement mode by pressing the CAL key
and entering the Calibration security code “11”. Calibration mode may also be accessed via the Setup
mode (see section 6.1).
5.1 Entering Calibration mode
ENTER ENTER
ENTER ENTER
ENTER ENTER
ENTER ENTER
MEAS
P H
O C
CAL
SETUP
HOLD
SETUP
HOLD
pH calibration
ORP-mV calibration
ORP-% calibration see section 5.2
see section 5.3
see section 5.4
1. While in Measurement mode press the CAL key (direct access) or ENT key (access via Setup mode).
2. If CAL key was pressed: The display prompts you to enter the calibration security code. Press the ▲ or
▼ key to set the calibration security code to “11”, and then press the ENT key to confirm the calibration
security code.
3. If ENT key was pressed: The display prompts you to enter the security code. Press the ▲ or ▼ key to
set the security code to “22”. Press the ENT key to confirm the security code, and then press the ▲ or
▼ key to select the calibration sub-function.
If configured for pH control, the display shows “CAL PH”. If configured for ORP control, the display
shows “CAL ORP”. To start calibration, refer to the corresponding section (see illustration above).
Note: to exit Calibration mode at any time press the ▲ and ▼ keys simultaneously
(escape). The transmitter returns to the Measurement mode and the old calibration values
remain active. The calibration security code automatically resets from “11” to “000” after the
transmitter returns to Measurement mode.
Note: The calibration is always carried out in the units (pH or mV or %) selected in setup
mode. The pH controller/transmitter allows a 1-point or 2-point calibration.
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