RMG TME400-VM, Operating Manual

Page: 36 / 137

1 Introduction
Manual TME400-VMF · EN07 · December, 7
th
2020
30
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
³
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
D
p
5 - 15 (c²
r
/ 2) 2 - 15 (c²
r
/ 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 perturbation measurements accord-
ing to OIML recommendation IR-32/89, Annex A, with slight and heavy upstream per-
turbation. 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.