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2.2 Installation example
2
6
19
5
1
18
Installation example of a chlorine gas dosing system with a
change-over device
Pos.
Component
1
Chlorine drum
1a
Chlorine drum scale
2
Controller for the pneumatic shut-off valve
3
Chlorine drum lifting device
4
185 change-over device
5
Nitrogen rinsing device
6
Expansion tank with bursting disc
7
RV171(W) evaporator
8
LiquFilt 524 heated liquid chlorine trap with filter
9
544 pressure reducing valve
10
VGA-148 vacuum regulator
11
VGS-145 chlorine gas dosing system
2.3 Operating principle
If one of the gas container batteries connected to the 185 change-
over device becomes empty, the contact manometer triggers the
change-over process. The respective motor valve closes the
connection to the empty container battery automatically. When the
closing motor valve reaches its end position, the second motor
valve opens the connection to the second container battery.
Signal lamps indicate the position of the valves at the control
cabinet.
The change-over device can be switched from automatic to manual
operation mode by means of the operation mode switch. In manual
operation mode, the motor valves are opened and closed with the
keys at the control cabinet.
In case of a failure of the motor valves, the additional bypass line of
the 185-2 change-over device permits operation by manual ball
valves.
Two potential-free contacts enable the transmission of the operating
status "open" for both motor valves to a control room.
Two potential-free contacts enable the indication of the valve
operation mode "man" or "auto" in a control room.
An additional contact transmits an alarm signal, if the pressure
remains below the contact manometer setting for more than 40
seconds.
6
3
6
4
1a
18
13
8
9
10
11
7
16
12
14
15
Pos.
Component
12
VGS injector
13
CR booster pump
14
Flowmeter with 4-20 mA signal
15
Injection unit
16
Gas sensor
17
Horn and flashlight
18
Vent to a Grundfos chlorine gas neutralisation system
19
Ventilation of the building
20
Central control cabinet (SCADA)
21
Conex DIA-G gas warning system
17
21
19
20
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