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2.2 Installation example
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5
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
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 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 operating status "open" of 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 over 40 seconds.
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3
6
4
1
1a
8
9
10
7
16
18
13
12
14
Pos.
Component
11
VGS-145 chlorine gas dosing system
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
11
21
19
20
15
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