RMG TME400-VMF - Standards; Guidelines

1 Introduction
Manual TME400-VMF · EN02 · 2018 September 6th
29
Perforated plate straightener
The following options are available for the straighteners:
Perforated plate straightener RMG L1 - L3
according to ISO 5167-1 and DIN 1952
Perforate plate straightener RMG LP-35
Characteristics
ISO/DIN
L1-L3
RMG LP-35
Hole diameter d
d  0.05 D
0.04 D
0.13 D
Plate thickness e
e  d
e = d
0.13 D
Clearance a
0.5 D  a  1 D
0.5 D
-
Opening ratio m
0.2  m  0.4
0.3
0.6
Dynamic pressure
loss p
5 - 15 (c²  / 2)
2 - 15 (c²  / 2)
With the RMG turbine meters, these straighteners fulfill the requirements of technical
guideline G 13 and are approved with approval number D 81 / 7.211.10 for turbine
meters.
1.4.2.7.
Standards / guidelines
All RMG turbine meters have passed upstream pertubation measurements according
to OIML recommendation IR-32/89, Annex A, with slight and heavy upstream per-
tubation. Therefore, this meter design fulfills the installation conditions according to
technical guideline G 13, section 1. The PTB testing vol. 29 and 30, testing of volume
gas meters with air at atmospheric pressure and high-pressure testing rules apply as
a testing requirement. The RMG turbine meter TME400 conforms to EN12261. The
measuring accuracy in the range of 0.2 Q
max
to Q
max
is between  1.0 % to 1.5 %
(see chapter 1.4.2.9 Measuring accuracy). The TME400 has an electronic suppres-
sion by external shut-down of the totalizer of the slow down cutoff of the turbine
wheel after the flow is stopped.