Thermo Fisher Scientific Alpha pH 2000 - Manual (Page 22)

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 access 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”, 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, 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▼ key
simultaneously (escape). The controller returns to the Measurement
mode and the old calibration values remain active. The calibration
security code automatically resets from “11” to “000” after the controller
returns to Measurement mode.