Thermo Fisher Scientific Alpha DO 1000 - Manual (Page 18)

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5.2 Security Codes
This controller has two levels of security protection with separate security codes.
The first level allows entry into the Calibration mode: security code = 11; the second
allows entry into the SETUP mode: security code = 22.
The security codes protect the controller from unauthorised tampering of its current
setting. The parameters cannot be changed unless the security code is entered.
5.2.1
How to enter and change parameters in Calibration mode
1. Press the CAL key. The upper display shows
“000” and the lower display shows “C.Cd” to
prompt the user to enter the Calibration security
code.
2. Press the ▲ or ▼ keys to scroll upper display
to Calibration security code “11”.
3. Press the ENTER key. The display shows “CAL
dO”.
4. Press ENTER key again to begin calibration. Refer to Section 6 for full
details on calibration.
5. Press the ▲ or ▼ keys simultaneously (escape) to return to the
Measurement mode.
NOTE: To view (not change) the SETUP parameters, push the
ENTER key when the security code reads “000”.
5.2.2
Clearing the Calibration security code from the display
The calibration security code automatically resets from “11” to “000” after you return
to Measurement mode, so you do not need to clear the security code from the
display.
5.2.3
How to enter and change parameters in Advanced Setup mode
1. Press the ENTER key once. The upper display shows “000” and the lower
display shows “S.Cd” to prompt you to enter the Advanced Setup security
code.
2. Press the ▲ or ▼ keys to scroll the display to Setup security code “22”.
NOTE: Pressing the ENTER key at a value other than “22” causes the
controller to revert to the Measurement mode.
3. Press the ENTER key.
4. The upper display reads “OFS”.
5. You are now in the Advanced Setup mode. See Section 7 for complete
instructions. To return to Measurement mode, press the ▲ or ▼ keys
simultaneously (escape).
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