6.3.2 Decreasing The Dosing Flow; 6.4 Reading The Dosing Flow; 6.6 Switching Off; Emergency Stop - Grundfos VGA-113-110 Installations- Und Bedienungsanleitung

6.3.2 Decreasing the dosing flow

• Turn the adjustment knob of the rate valve slowly to the left.
Fig. 28 Decreasing the dosing flow

6.4 Reading the dosing flow

• Read the dosing flow at the upper edge of the ball.
lbs/day g/h
Fig. 29 Reading the dosing flow
The scale of the measuring tube is adjusted to a gas
temperature of 20 °C. In case of extremely different
Note
temperatures the dosing flow may differ from the
value being displayed.
6.5 Switching on
• Close the rate valve.
• Open the shut-off valve at the injection unit.
• Open the motive water valves.
• Switch on the motive water of the injector.
• Open the valve of the gas cylinder.
• Slowly open the rate valve until the ball in the measuring tube
shows the desired gas flow.

6.6 Switching off

6.6.1 Emergency stop

In case of gas break-out
Warning
Immediately leave the room in case of gas break-out
and put on safety equipment!
Then start counter-measures!
• Immediately leave the room!
• Start counter-measures according to local safety precautions.
In case of small leakages
• Put on safety equipment!
• Immediately close the cylinder valve.
• Let the system run until all parts are evacuated.
• Switch off the system as described in the following.
Warning
Repairs of components of the system only by
authorized personnel!

6.6.2 Switching off while the system is running

• Close the cylinder valve.
• Let the system run until the measuring tube shows no more
gas flow.
• Close the rate valve.
• Switch off the motive water of the injector.
• Close the motive water valves.
• Close the shut-off valve at the injection unit.

6.7 Changing the gas cylinder

The empty indication of the dosing unit shows when the minimum
pressure of the gas cylinder is reached. Then the cylinder must
be changed.
Warning
Put on the prescribed safety equipment!
While the system is running
• Close the cylinder valve.
• Let the system run until the measuring tube shows no more
gas flow.
• Close the rate valve at the dosing regulator.
• Switch off the motive water of the injector.
• Close the motive water valves.
• Close the shut-off valve at the injection unit.
• Unscrew the vacuum regulator from the connection of the gas
cylinder.
– If present, place it on the wall holding device.
• Screw the protective cap onto the empty cylinder, move it
away and protect it against falling down.
• Place the new gas cylinder and fix it correctly.
• Remove the protective cap from the new gas cylinder.
– All connections must be absolutely clean and dry.
Warning
Never re-use used gaskets! Replace the gaskets at
any change of gas container!
Never use the vacuum regulator without the filter!
• Insert the gasket at the pressure connection of the vacuum
regulator.
– Replace the filter, if necessary.
• Screw the vacuum regulator onto the connection of the
cylinder.
Do not align the device by turning the housing!
Caution
If necessary, hold up with a fork wrench size 13!
Warning
Before re-starting: check the tightness!
• Check the tightness.
• Re-start the system.
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