Functional Check - Grundfos DID Montage- Und Betriebsanleitung

10.2 Functional check

A functional check can be required for one of the following
reasons:
• Initial startup
• Routine
• Malfunction
• Modification of the DID setup (e.g. integration of an additional
sensor)
• Change of measuring location.
We recommend to perform a regular functional check as
described in the table below. The functional check should be
carried out monthly or weekly, depending on the application
(water quality), the sensors connected and the environmental
conditions.
For the functional check of the sensors, see the manual
"Sensors" supplied with the sensor. Find the manual "Sensors for
DID" on Grundfos Product Center: (http://net.grundfos.com/Appl/
ccmsservices/public/literature/filedata/Grundfosliterature-
6119622.pdf).
Component Functional check
CU 382 control The green LED is on and the text is visible on
unit the display.
CU 382 control The displayed system time is correct and the
unit time is updated every second.
CU 382 control No error messages or error symbols are
unit displayed.
DID All hoses and fittings are tight.
CU 382 control
The digital output of the flow detector is ok.
unit
Water is flowing out of the outlet hose.
Outlet
Water is visible within the hoses.
Water is flowing out of the outlet hose.
Flow cell
Water is flowing out of the sampling point.
The water flow is continuous, no air bubbles
Hoses
are visible in the hoses.
No "NaN", no "- - - -,- -" or "++++,++" is
CU 382 control displayed. No Parameter name is flashing. All
unit and readings are plausible.
sensors Scroll through the displayed parameters with
the [Up], [Down], [Left] and [Right] buttons.
CU 382 control
The chronological sequence looks plausible,
unit and
with daily or seasonal fluctuation.
sensors
CU 382 control
All readings are within the specified and
unit and
calibrated measuring range.
sensors
There is a difference between the laboratory
values and the readings of the sensor.
CU 382 control • If the difference is significant, perform a
unit and local calibration.
sensors
• Use a reliable and validated comparison
method to verify the accuracy of the
displayed readings.
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