ParTech SludgeWatch 8200w2 - Blanket Not Detected; Blanket Continually Detected

8200w² Monitor Instruction Manual
the Alarm x Set Delay and Alarm x Reset Delay are set to zero so the current alarm status is
accurately reported in real time.
7.3.1 Blanket not detected
If the sensor is not detecting the sludge blanket and the OK status remains asserted when the sensor
is in the blanket, take the following action:
With the sensor in the sludge blanket, take note of the % solids value on the display. Enter the Alarm
Config menu and choose the appropriate Alarm x Config option. Set the Alarm x Value to 5% less
than the recorded value. This will ensure the alarm will trigger at the desired % solids. It may also be
advisable to set the Alarm x Hysteresis value to about 5% in order to emphasise a clear boundary
layer.
7.3.2 Blanket continually detected
If the sensor is continually detecting the sludge interface and the ALARM stays on when the sensor is
above the sludge blanket the following action should be taken:
With the sensor above the sludge blanket, take note of the % solids value on the display. Enter the
Alarm Config menu and choose the appropriate Alarm x Config option. Set the Alarm x Value to 5%
greater than the recorded value. This will ensure the alarm will clear at the desired % solids.
Note: If the Alarm x Value is set to 100% 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 an accurate adjustment of the Alarm x Value to a required level:
1. Immerse the sensor fully in a known sample of the required value.
2. Record the % solids value on the display.
3. Enter the Alarm Config menu and choose the appropriate Alarm x Config option. Set the Alarm x
Value to 5% less than the recorded value.
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
229844IM Issue 01 Issue Date 24/06/2019 ` Page 27 of 34