Connecting The Control Medium; Optical Position Indicator; Stroke Limiter; Commissioning - GEM 650 Special function J Operating Instructions Manual

15.2 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 connector:
GEMÜ 650
diaphragm size 10, 40: G1/4
GEMÜ 687
diaphragm size 25, 40, 50: G1/4
Control function
1 Normally closed (NC)
For connector 2, see figures

15.3 Optical position indicator

Valve open

15.4 Stroke limiter

NOTICE
▶ For GEMÜ 687, there must not be a stroke limiter fitted.
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Connector 2
Control medium (open)
Valve closed
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16 Commissioning

Corrosive chemicals!
▶ Risk of caustic burns
Wear appropriate protective gear.
●
Completely drain the plant.
●
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. Commissioning of actuators in accordance with the en-
closed instructions.

17 Operation

Operate the product according to the control function (see
also chapter "Pneumatic connections").
17 Operation
WARNING
CAUTION
CAUTION
GEMÜ 650 / 687 Special function
J