Installation - RMG TERZ 94 Operating Instructions Manual

INSTALLATION

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The pressure loss coefficient ZP is constant for all volumeters of the types TERZ 94 and TERZ 94-S.
It is:
Z = 5040
This is an approximate mean value. The exact value is calculated from the pressure loss which is
P
determined on testing the volumeter.
Example of calculation:
10
Q = 650 m
M
Therefore, the pressure loss ∆p with a volumeter of the type TERZ 94 is 5.5 mbar in this case.
Installation
The gas flow must be free of shocks and pulsations as well as free of foreign particles, dust and
liquids. Any components affecting the gas flow must absolutely be avoided directly upstream of the
TERZ 94 volumeter.
To achieve the highest possible accuracy (measuring error <1%), an inlet pipe of 2 DN in length with
a perforated-plate straightener should be installed upstream of the meter.
You can install the meters in any position (vertical or horizontal) up to and including the nominal
diameter of DN 200. From the nominal diameter of DN 250, only the position stated in the
purchase order is possible.
When you install the volumeter, please observe the direction of flow indicated on the case!
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/h; DN 150; ρ = 1.3 kg/m
3 Q
∆ p = Z ⋅ ⋅ ρ 2 =
DN
M
4
P
[natural gas, 600 mbar]
3
650
5040 ⋅ 1 3 . ⋅ = 5 5 .
2
150
4
mbar
Manual TERZ 94 · EN09a · 2017-11