Thermo Fisher Scientific Alpha DO 1000 User Manual

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NOTE: If you want to view (not change) set up parameters, push the

ENTER key when the security code reads “000”.

5.2.4

Clearing the Advanced Setup Security Code from the Display

After you have entered the security code and returned to the Measurement mode,
the security code “22” still appears on the display whenever you press the ENTER
key. To conceal the security code, you must manually reset the code. To clear the
Advanced Setup security code from the display:

1. Press the ENTER key in the Measurement mode.

2. Set to any security code (not 11 or 22) and complete by pressing ENTER.

NOTE: When you enter the Calibration mode with code “11” or

Advanced Setup mode with security code “22”, the unit
automatically enters into the HOLD mode until you return back to
Measurement mode. The HOLD annunciator is displayed at the
upper left of the display. While on HOLD, the current output is
frozen and set point relays are deactivated.