Checking The Tightness; Startup And Function Test - Grundfos 189 Notice D'installation Et De Fonctionnement

4.2 Checking the tightness

This section refers to fig. 3.
Check the tightness of the whole system before startup.
Warning
The device must be commissioned only by qualified
staff.
Observe the material safety data sheets (MSDS) of
the handled chemicals!
Wear protective clothing and a gas mask when
carrying out work at the system!
4.2.1 Leak test of vacuum side
Warning
For the leak test the gas dosing unit must be
evacuated and free of gas. The injector must be
ready for operation.
1. Close the connecting valves of all drums or cylinders.
2. Start injector (8). The vacuum lines are evacuated. In this
operating state the change-over device (4) switches
uncontrollably.
3. After about 10 minutes (depending on the length of the
vacuum lines and the setting of the adjusting valve at the gas
dosing unit (7)) the variable area flowmeter (9) must indicate
no flow.
– If no flow is indicated, proceed as described in section
4.2.2 Leak test of pressure
If the variable area flowmeter (9) indicates a flow, check the
complete system for leaks:
1. Disconnect the vacuum lines between vacuum regulators (3)
and gas dosing unit (7) one after the other.
2. Close each disconnected line tight with the finger.
– If the variable area flowmeter (9) stops indicating a flow, the
disconnected component is leaky.
3. Repair or exchange the leaky component and check the
tightness again.
8
side.
4.2.2 Leak test of pressure side
For details on the leak test, see separate installation and
operating instructions of the Vaccuperm system.
For this test, ammonia water in a flexible plastic bottle is required
(must be purchased from local chemical supplier).
1. Stop injector (8).
2. Open the connecting valves of the drums or cylinders by
about one revolution.
3. Check the connecting parts and inlet valves of the vacuum
regulators for leaks:
– Open the flexible plastic bottle filled with ammonia water.
– Slightly press the bottle in a pumping manner, allowing the
ammonia mist to rise up. Slowly pass the open ammonia
bottle along gas-leading parts.
– White mist indicates a leak.
– Repair or exchange the leaky component and check the
tightness again.
Warning
All leaks have to be removed immediately.

4.3 Startup and function test

This section refers to fig. 3.
Prior to startup, all gas-carrying parts have to be
checked for leaks. See section
Note
tightness.
After the leak tests have been completed successfully, the
vacuum change-over device (4) can be commissioned.
1. Entirely open the connecting valves of the drums or cylinders.
2. Start injector (8).
– Gas is dosed.
– The position of the indicator pin at the change-over device
shows which battery supplies the gas.
To complete startup, the change-over function must be tested as
described in the following section.
4.3.1 Test of change-over function
1. Open the connecting valves of all drums or cylinders.
2. Start injector (8).
3. Close the connecting valves of the drums or cylinders of the
supply battery.
4. The change-over device switches over to the standby battery
after a short period of time.
5. Reopen the connecting valves of the supply battery and close
the connecting valves of the standby battery.
6. The change-over device switches over to the supply battery
after a short period of time.
7. Open the connecting valves of all drums or cylinders.
– The vacuum change-over device is ready for operation.
4.2 Checking the