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6.7
WHG Proof Test
The implementation of the WHG proof test is done in accordance with the documentation
"Technical Description" for WHG, Annex 8, Proof Test, by following possibilities:
Filling the vessel
Filling the vessel until the switchpoint is reached and monitoring the correct reaction of the
system
Simulation of the level
Suitable simulation of the level or of the physical measurement effect
This can be done for example by dismounting the sensor and immersion into the original
medium.
Interruption of the supply voltage
Interruption of the supply voltage of LCS100 for > 2 sec and monitoring the correct reaction
of the system
With connection of an additional signal conditioning instrument, which meets the
requirements of clause 3 and 4 of the ZG-ÜS.
The LCS100 starts a self diagnostics routine when the power supply is applied with a defined
startup behaviour, see Diagnostics/Remote function test (Page 60). Possible functional
failures can be monitored by the reaction of the system.
Pushing the Test Key on a signal conditioning instrument
Pushing the Test Key on a signal conditioning instrument and monitoring the status indicator
on the signal conditioning instrument
With connection of an additional signal conditioning instrument, which meets the
requirements of clause 3 and 4 of the ZG-ÜS.
This possibility is described with use of the signal conditioning instrument Siemens SITRANS
SCSC or TCSC as follows:
Use of signal conditioning instrument with Test Key: Siemens SITRANS SCSC or TCSC
SITRANS SCSC/ TCSC
The signal conditioning instrument is available as single channel SCSC (connection of one
LCS100) or double channel TCSC (connection of two LCS100).
The operation manual of SITRANS SCSC or SITRANS TCSC is mandatory. Following notes give
support for the connection with LCS100.
Function of the Test Key
The Test Key on the SITRANS signal conditioning instrument interrupts the supply voltage of
the LCS100. When the supply voltage is applied, the LCS100 starts a self diagnostics routine
with a defined startup behaviour (see Diagnostics/Remote function test (Page 60).). Possible
functional failures will be evaluated by the signal conditioning instrument, which switches to
the overflow state and indicates the failure by a LED
SITRANS LCS100 2-wire mA and Relay Version
Operating Instructions, 05/2023, A5E52142831-AA
Operating
6.7 WHG Proof Test
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