Connecting The Control Medium; Operation; Commissioning - GEM 687 Operating Instructions Manual

12 Operation

The product has 2 control medium connectors.
Control function Control medium
connector 2 (open)
1 (NC)
2 (NO)
3 (DA)
+ = available
– = not available

11.2 Connecting the control medium

1. Use suitable connectors.
2. Connect the control medium lines tension-free and
without any bends or knots.
Thread size of the control medium connectors: G1/4
Control function
1 Normally closed (NC)
2 Normally open (NO)
3 Double acting (DA)
For connectors 2 / 4 see figure above
GEMÜ 687
Connector 2
Control function 1
Connector 4
Connector 2
Control function 2 + 3
Control medium
connector 4 (close)
+ -
– +
+ +
Connectors
2: Control medium (open)
4: Control medium
(close)
2: Control medium (open)
4: Control medium
(close)
12 Operation
Optical position indicator
▶ Control function 1: As standard
▶ Control function 2+3: optional
Optical position indicator
Valve open

13 Commissioning

Corrosive chemicals!
▶ Risk of caustic burns
●
●
Leakage
▶ Emission of dangerous materials.
Provide precautionary measures against exceeding the
●
maximum permitted pressures caused by pressure
surges (water hammer).
Cleaning agent
▶ Damage to the GEMÜ product.
The plant operator is responsible for selecting the clean-
●
ing material and performing the procedure.
1. Check the tightness and the function of the product (close
and reopen the product).
2. Flush the piping system of new plant and following repair
work (the product must be fully open).
ð Harmful foreign matter has been removed.
ð The product is ready for use.
3. Commission the product.
4. Commission actuators in accordance with the enclosed
instructions.
14 Operation
Flow direction
▶ The flow direction of the product is optional.
Operate the product according to the control function (see
also chapter "Pneumatic connections").
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NOTICE
Valve closed
WARNING
Wear appropriate protective gear.
Completely drain the plant.
CAUTION
CAUTION
NOTICE
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