8100/8200 Monitor Instruction Manual
5.3.2 Blanket continually detected
If the sensor is continually detecting the sludge interface and the red ALARM LED stays on when the sensor is above
the sludge blanket the following action should be taken:
• With the sensor above the sludge blanket, set the delay to the minimum, then the alarm point control should be
slowly turned clockwise until the green OK LED illuminates. This indicates that the sensor is correctly, not
detecting the sludge blanket.
Note: If the setpoint control is turned fully clockwise and the detector continually indicates the presence of the sludge
blanket when the sensor is above the blanket, the sensor that is fitted is too sensitive and an alternative sensor will
have to be fitted
For accurate adjustment of the setpoint to a required level:
1. Immerse the sensor fully in a known sample of the required value.
2. Turn the alarm point control fully anti-clockwise; the green OK LED should illuminate.
3. The alarm point control should be turned clockwise until the red ALARM LED illuminates.
The desired alarm point has now been set and the controller will now detect sludge blankets of this value or higher.
Note: In the event of the sensor being changed, it will be necessary to repeat the above alarm point adjustment in
order to obtain accurate results
168270IM-02 Issue Date 05/01/2010 Page 10 of 14
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