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10. Servicing the product
10.1 Cleaning
The following DID parts require periodical checks and cleaning,
the interval depends on the particular water in which they are
applied. It is suggested to initially check these components on a
monthly basis, reducing the frequency if possible depending on
the actual water composition.
10.1.1 Inlet strainer
The strainer includes a sieve that will collect coarse material and
can foul. Therefore, a periodical check of the strainer is
necessary. Cleaning of the sieve is recommended at the indicated
monthly interval or when the flow through the station drops below
the optimal flow, although all valves are set in the open position
and the pump (if installed) if working as specified and inlet
pressure is correct.
Cleaning can be performed after switching off the water flow
through the station. Unscrew the cap from the strainer, take out
the filter and rinse it with drinking water. Remove any coarse
materials from the strainer housing. Then reinsert the sieve and
attach the screw cap.
10.1.2 Flow detector
As the line strainer removes larger sediment from the influent
water stream, it is not expected that the flow detector will require
maintenance. However, the flow detector contains moveable
internals that respond to the flow. These can be affected by
fouling. In case the flow detection does not respond to flow
changes, it can be dismounted from the station and carefully
rinsed with water and a soft brush.
10.1.3 Sensor
Refer to sensor documentation
10.1.4 Control unit CU 382
If necessary, clean all control unit CU 382 surfaces with a damp
and clean cloth.
10.2 Functional check
A functional check might be required for one of the following
reasons:
• Initial startup
• Routine functional check
• Suspicion of DID malfunction
• Modification of DID (e.g. integration of additional sensor or
device)
• Change of measuring location
Depending on the application (water composition), the sensors
connected and the environmental conditions a regular functional
check (weekly to monthly) is recommended. The following table
provide an overview of all the actions that have to be performed
to check the DID. Regarding the functional check of the individual
sensors, please refer to the sensor manual.
Check Part What and how to check
Power supply CU 382 Green LED is on and text is visible on the display
System running (up-to-date) CU 382
Displayed system time is current and is updated every second?
Use arrow buttons
System status CU 382 No error messages or error symbol displayed?
Tightness / leaks DID All tubes and fittings are tight, no water is leaking
Water discharge CU 382 Digital output of flow detector is ok
Water discharge Outlet Water is flowing from the outlet tub, water is visible within the tubes
Sensors submersed Flow cell
Water is flowing from the outlet tube, water is flowing from the sampling
tube
Air bubbles Tubes Water flow is continuous, no air bubbles are passing the tubes
Current parameter readings CU 382 and Sensors
No NaN and no dashes (- - - -,- -) or plus sign (++++,++) displayed. No
Parameter name is flashing. Readings are plausible.
Use arrow buttons to scroll through all displayed parameters.
Plausibility of readings CU 382 and Sensors Time series look plausible with daily or seasonal fluctuation.
Measuring range CU 382 and Sensors Readings are within the specified and calibrated measuring range?
Accuracy of readings CU 382 and Sensors
Difference between laboratory values and readings of the sensor. In
case of significant difference a local calibration has to be performed. To
verify the accuracy of the displayed readings only a reliable and
validated comparison method has to be used.
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