Elster TC210, Operating Manual And Installation Instructions

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Temperature-Volume Corrector TC210
56 ELSTER Handel GmbH
5.2.1 Installation procedure for the device versions I to IV
The following steps must be carried out to install the device:
1. Mounting the TC210 directly onto a thermowell.
If no thermowell is available, then with turbine-wheel and diaphragm gas meters the in-
stallation must be made up to 3 D, but at most 600 mm after the meter. With rotary pis-
ton meters the distance should be 2 D in front of the meter (D = pipe diameter).
2. Connect the pulse transmitter.
3. If required, connect further equipment to the pulse/signal outputs.
F
If the TC210 is used in a hazardous area (Zone 1) , then only intrinsically safe elec-
trical circuits of certificated "associated operating equipment " must be connected .
The regulations for connecting intrinsically safe circuits must be followed. The elec-
trical data of the TC210 can be taken from the EC prototype test certificate (see Ap-
pendix A-2 ). These must be followed. The approval is only valid when electrical cir-
cuits are connected which conform to the EC prototype test certificate.
4. With any unused union glands replace the insertion seal by the enclosed blind insertion
seals.
5. Sealing of the device by the weights and measures office or test station according to the
seal layout.
6. Close the housing (battery compartment).
F
When closing the housing, make sure that no cables are pinched.
5.3 Cable connection and earthing
The TC210 housing must always be earthed in order to divert high energy and high volt-
age electromagnetic interference. For this purpose an earth connection, which has a direct
connection to the metallised interior coating, is provided on the left side of the housing.
The earthing must be low resistance. The best conditions are obtained when a direct con-
nection is provided to the local potential equalisation strip through a cable which is as short
and as thick (at least 4mm²) as possible.
All permanently connected cables have a screen which must be earthed at both ends to
prevent interference due to high frequency electromagnetic fields. The screen must be
connected all round, complete and flat. The TC210 has special EMC cable glands for this
purpose.
With correct connection of the cable screens and correct laying of the cables effects due to
circulation should not be expected. If, however, interference due to earthing points with
potential differences occur, potential equalisation lines can be laid in parallel to the cables.
These should then be connected as close as possible to the cable screen connection
points.
Additional requirements are placed on the earthing of conducting screens between Ex ar-
eas and non-Ex areas. The relevant installation requirements, e.g. EN 60079-14, must be
followed.