3 Types of totalizers
Manual TRZ 03· EN08 ·2018 September, 10th
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3.8 Temperature measurement
In order to measure the gas temperature, a resistance thermometer can be used
in a thermowell in a fitting downstream of the gas meter. It is recommended that a
second thermowell, e.g. for a monitoring thermometer, be used. If such thermo-
wells are not provided for in the meter housing, temperature measurement must
be performed at a distance of up to 3 x DN or a maximum of 600 mm downstream
of the turbine meter.
All turbine meters of types TRZ 03 and TRZ 03-K from the nominal diameter of
DN 80 (3") upwards can be fitted with a thermowell for a PT100 resistance ther-
mometer. Due to their short size, turbine meters of type TRZ 03-K cannot be fitted
with a thermowell.
Notice
The measuring elements of the temperature sensors located outside the
gas line must be appropriately insulated against the weather.
In order to achieve optimum thermal conduction, oil as a heat transfer
liquid should be filled in the thermowells in any case.
Operating temperatures prevailing at outdoor metering stations in winter or at nat-
ural gas metering stations downstream of regulating stations are usually in the
range of -5°C to +10°C. By comparison, higher operating temperatures prevail at
metering stations located downstream of compressor stations.