Safety And Warning Notes - Elster 2 Series Commissioning And Maintenance Instructions

Safety and Warning Notes

Attention! The following safety and warning notes must be
!
observed at any rate:
•
The gas-net flow computer F1 must neither be stored at temperatures
below -20°C nor above +50°C.
•
A temperature between 0°C und +40°C must be guaranteed during
operation.
•
The electronic flow computer must be installed outside ex-zone 2.
•
The gas-net devices are equipped with hardware modules that are
approved as associated electrical apparatus of category ib according
to DIN EN 50020 with intrinsically safe circuits. The flow computer F1
is therefore suitable for being connected to sensors and pulse
generators (and encoder totalizers, respectively) that are located in
hazardous areas (e.g. zone 1).
It is not permitted to connect intrinsically safe and non-intrinsically
safe circuits to these modules together.
•
Only intrinsically safe temperature and pressure sensors of protection
class EEx ib II C should be connected. If flameproof pressure and
temperature sensors (Ex-d) are used, the connection of the gas meter
to the EXMFE5 board must be implemented via suitable isolating
switching amplifiers!
•
The power supply of the gas-net devices is implemented via 24 V DC
and must be secured externally by 1 A.
•
The earthing is connected to PE of the power supply socket for
equipotential bonding.
•
Observe the regulations of the relevant standards, in particular the
regulations of DIN EN 50014, DIN EN 50020 and DIN EN 50029.
•
Observe the limit values stated in the respective certificates of
conformity of the boards to be connected.
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gas-net F1