IM-P736-02 EMM Issue 3
30
VLM30 In-Line Vortex Flowmeter
3.9 Installing the sensor
Observe the following points during installation:
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For devices with a remote mount design, make sure that the sensor and transmitter are assigned correctly.
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The flow direction must correspond to the marking, if present.
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The maximum torque must be observed for all flanged connections.
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The devices must be installed without mechanical tension (torsion, bending).
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Wafer type devices with plane parallel counter flanges should be installed with suitable gaskets only.
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Use gaskets made from a material that is compatible with the measuring medium and measuring medium
temperature.
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The piping may not exert any inadmissible forces or torques on the device.
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Do not remove the sealing plugs in the cable glands until you are ready to install the electric lines.
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Make sure the gaskets for the housing cover are seated correctly. Carefully seal the cover. Tighten the
cover fittings.
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Do not expose the transmitter to direct sunlight and provide for appropriate sun protection where
necessary.
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When selecting the installation location, make sure that moisture cannot penetrate into the terminal box
or the transmitter housing.
Installation of the flowmeter
The device can be installed at any location in a pipeline under consideration of the installation conditions.
1. Position the meter tube coplanar and centered between the piping.
2. Install gaskets between the sealing surfaces.
Note:
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To achieve the best results, make sure that the gaskets and meter tube fit concentrically.
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To guarantee that the flow profile is not distorted, the gaskets must not protrude into the piping.
3. Use the appropriate screws for the holes.
4. Slightly grease the threaded nuts.
5. Tighten the nuts in a crosswise manner as shown in the figure.
First tighten the nuts to approximately 50% of the maximum torque, then to approximately 80%, and
finally a third time to the maximum torque.
Note: Torques for screws depend on temperature, pressure, screw and gasket materials. The relevant
applicable regulations must be taken into consideration.
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