Endress+Hauser promag 31, Operating Manual

Page: 15 / 60

Downward pipe (>5 m)
With the suggested installation opposite
(siphon, vent valve after the sensor) no
partial vacuum is created with such a
downward pipe >5 m long.
Installation of pumps
If possible avoid mounting the sensor on
the suction side of the pump (danger of
vacuum!). Information on the resistance
to vacuum of the measuring pipe lining
can be found on Chapter 6.2.
Adaptor pieces
The sensor can also be mounted in a
pipe with a larger nominal diameter
when suitable adaptors (reducers and
expanders) to DIN 28545 are fitted. The
resultant increase in the rate of flow
increases the accuracy of measurement
with slowly flowing fluids.
The adjacent nomogram can be used to
determine the pressure loss caused.
Procedure:
1. Determine the ratio of the diameters
d/D.
2. From the nomogram read off the
pressure loss at the flow velocity and
d/D ratio.
Note!
The nomogram applies to fluids with a
viscosity similar to that of water.
Vent valve
b
a
028y
12
>5
m
Fig. 15
b
a02
8y
1
3
Fig. 16
max. 8°
d D
b
a02
8y
1
4
Pre
s
s
u
re
lo
s
s
in
[m
ba
r]
Diameter ratio d/D
Fig. 17
Promag 31 2. Mounting and Installation
Hauser 15