RMG TME400-VM, Operating Manual

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1 Introduction
Manual TME400-VMF · EN07 · December, 7
th
2020
20
1.3.5.1. Suitability and compatibility for natural gas containing H
2
The TME400 can be used in hydrogen-containing natural gas up to pure hydrogen.
There are no safety-related concerns for this use.
Notice
In accordance with the German TR-G19 – the TME400 is suitable and ap-
proved for use in custody transfer applications – in natural gases with a
maximum hydrogen content of 10 mol-%, with the accuracy specified in
chapter 1.4.2.9 Measuring accuracy .
Since there are currently no certified test rigs in Germany to calibrate meters with
higher hydrogen-containing gases, an accuracy above 10 mol-% cannot be tested or
certified.
Not custody transfer measurements are of course possible in natural gases with a hy-
drogen content above 10 mol%. However, a reduced measuring range must be taken
into account if applicable. Please contact RMG for further information.
1.4. Areas of application
The following chapter provides handling instructions for the TME400 turbine meter for
the purpose of safe and reliable operation of the device.
Note
Some of the settings described below must not be made until you have read
the explanations in
chapter4 Operation .
1.4.1.
Working principle of the TME400
The working principle of a mechanical turbine meter is based on the measurement of
the gas velocity of the flowing gas which powers a turbine wheel. The speed of the
turbine within the measuring range (Q
min
- Q
max
) is approximately proportional to the
mean gas velocity and thus the flow rate. The number of rotations, therefore, is a
measurement for the gas volume flowing through.