Thermo Fisher Scientific Alpha pH 2000D - Manual (Page 12)

2.3.3 LED indicators
Relay indicators
If REL key is pressed the LED (A, B or W) indicates to which Relay (A, B or Wash)
the displayed limit values refer.
Relay mode indicators
Auto LED lights if relay operation is set to automatic mode. Manu LED lights if relay
operation is set to manual mode.
Relay status indicators
This LED lights if limit value is exceeded or the ATC probe fails.
This LED lights green if measured value is within the limit for Relay A or lights red if
measured value exceeds limit.
This LED lights green if measured value is within the limit for Relay B or lights red if
measured value exceeds limit.
This LED lights if cleaning cycle is on.
2.3.4 Security codes
The access to Calibration mode, Setup mode and Manual relay operation mode is protected with
security codes. The security codes are set at the factory and cannot be changed by the user. The
following security codes are used:
Security code Mode Description
000 View only mode to view actual settings
11 Calibration mode to start calibration
22 Setup mode to configure parameters
22 Manual relay operation to switch relay operation mode from automatic
to manual
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