User Manual CWD2005 Plus
Protection system
5. Protection system
The enclosure of the analyzer is purged by compressed air with a min. consumption of 35
m³/h and a pre-pressure of 101.5 psi.
Within the container there's an overpressure of 1 InWc. The air flows through the enclosure
and rinse the analyzer. It is ensured by the overpressure that possibly accumulated gas is
led to the outside.
The overpressure is monitored by the pressure switch -Q2- in reference for environment. The
reference to the outside is located at bottom of the case.
If the pressure in the enclosure drops the pressure switch will be tripped and the relay K1
goes dead and drops out. An error signal is triggered and can be transmitted to a PLC. The
signal can be gripped at pins -x101/1-2-.
Ref.doc.: Wiring diagram
5.1 Gas flow restriction
A regulator with inner diameter of 0.5 mm is installed in the process gas and calibration gas
input. This is relevant in the case of a gas leak to limit the gas flow. The regulator is installed
by the manufacturer and may not be removed in any case.
5.2 Special feature of the safety system
In case of a system-fault occurs, it is possible to avoid a complete shutdown of the system
and the analyzer produce an error signal instead. This signal can be gripped at pins -x101/1-
2-.
To use this function, the pins -x100/S-S must be by-passed.
For safety reason, the manufacturer recommends the bypass is performed only during
service or maintenance work. Afterwards it must be completely removed.
Warning!
Terminals marked with "S" are for service only!
Remove jumper from both terminals after any local service work
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