BA-CFD-RLM-ATEX 4.0
– 05/2019
English
EN-14/24
7.5 Volumeter
The fans are equipped with a volumeter as a standard. With this flow
measuring device it is possible to measure/monitor the flow easily after the
fan is installed.
-
Measuring nipple on intake cone
-
piping to connector at support unit
-
connector (external diameter 6mm) to pressure measuring device
Figure 7-4: Volumeter
q
V
volume flow [m³/h]
K
calibration factor [m²s/h]
ρ
density of media [kg/m³]
p
Dü
pressure difference at cone [Pa]
Figure 7-5 :Built in fan
When fans are built in a plenum, it is required to measure the differential
pressure between the static pressure in the plenum on the suction side and
the pressure at the inlet cone.
To ensure that the static pressure to be measured at the inlet nozzle is not
distorted by dynamic velocities, it is recommended to attach a ring-line of
measuring points on the wall as shown in the following diagram.
When using a differential pressure sensor, the signal can be used for
automatic control purpose.
For calculation of the flow rate a calibration coefficient (K-factor) for every fan
required this is determined by comparative measurement on a standard test
rig with none disturbed air flow at suction.
K-Factor deviation
Standard calibration
K10 < 10%
RLM E6- E3-G6 Calibration factor K10 RLM 56- 55-
Calibration factor K10
2225
73 m²s/h
2528
73 m²s/h
2528
79 m²s/h
2831
90 m²s/h
2831
94 m²s/h
3135
105 m²s/h
3135
106 m²s/h
3540
120 m²s/h
3540
128 m²s/h
4045
150 m²s/h
4045
155 m²s/h
4550
190 m²s/h
4550
190 m²s/h
5056
240 m²s/h
5056
242 m²s/h
5663
300 m²s/h
5663
310 m²s/h
6371
385 m²s/h
6371
385 m²s/h
7180
485 m²s/h
7180
490 m²s/h
8090
620 m²s/h
8090
628 m²s/h
9010
790 m²s/h
9010
794 m²s/h
1011
1000 m²s/h
1011
1017 m²s/h
1112
1260 m²s/h
1214
1540 m²s/h
7.6 Install Protection Devices
1.
Fit guards to protect exposed inlet openings (EN ISO 13857).
2.
Design safety devices in such a way that they prevent objects from being
sucked in or from falling in (see EN 60529).
Dü
p
K
qv
2
