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9 Installation in piping
▶ If the device is to be installed with the pressure connec-
tion at the top, make sure that no liquid flows away along
the housing as this could result in moisture and dirt
blocking the gauge reference in the housing and, in turn,
to the equipment malfunctioning. Where necessary, re-
move dust and dirt from the edge of the electrical con-
nection's union.
▶ Make sure that you do not remove the packaging and
protection caps from the device until you are just about
to install it, so that you do not damage the diaphragm or
the threads.
▶ Keep the protection caps. Dispose of packaging properly.
9.2 Installing outdoors and in damp conditions
1. Electrically connect the device as soon as it is installed, or
take measures to prevent the ingress of moisture, e.g. us-
ing a suitable protection cap. (The stated protection class
applies to the device once it is connected.)
2. When installing the device, position it such that splashed
water and condensation can drain away. Liquid must not
be allowed to accumulate on sealing surfaces.
3. For devices with a cable outlet, the outgoing cable must
be routed downwards. If the cable has to be routed up-
wards, this must be implemented in an elbow that is dir-
ected downwards.
4. Install the device such that it is protected from direct
sunlight. In the worst case scenario, exposure to direct
sunlight can result in the permissible operating temperat-
ure being exceeded. This must be completely avoided
when using the device in Ex areas.
5. Install devices with a gauge reference in the housing
(small hole next to the electrical connection) such that
the gauge reference needed for the measurement is pro-
tected from dirt and moisture. If the measuring trans-
ducer is exposed to liquid, the gauge reference will be-
come blocked, preventing the air pressure from equaliz-
ing. It is not possible to measure accurately in this situ-
ation, and the measuring transducer may be damaged as
a result.
GEMÜ 3140 ... X
NOTICE
NOTICE
9.3 Installation steps for connections in accordance
with DIN 3852
▶ Do not use any additional sealing material such as
oakum, hemp or Teflon tape.
The O-ring must sit in the groove provided.
The O-ring is not damaged.
The sealing surface of the part that accommodates it must
be free of defects. (R
1. Screw the device onto the mounting thread by hand.
2. Devices with a knurled collar must be screwed on tightly
by hand
3. Devices with a wrench surface must be tightened with a
suitable open-end wrench.
Steel wrench surface:
G1/4": Approx. 5 Nm
G1/2": Approx. 10 Nm
Plastic wrench surface:
Max. 3 Nm
9.4 Installation steps for connections in accordance
with EN 837
A suitable seal that is compatible with the measurement me-
dium and the pressure that is to be measured must be
provided (e.g. a copper gasket).
The sealing surface of the part that accommodates it must
be free of defects (R
1. Screw the device onto the mounting thread by hand.
2. Then tighten it with the open-end wrench:
G1/4": Approx. 20 Nm
G1/2": Approx. 50 Nm
▶ Observe the permissible pressures in accordance with
EN 837
G1/4" EN 837
G1/2" EN 837
G1/4" EN 837
G1/2" EN 837
12 / 20
NOTICE
3.2)
Z
6.3).
Z
NOTICE
P
≤ 600 bar
The counterpart
N
must be made from
P
≤ 1000 bar
N
steel in accordance
with DIN 17440
with a strength of
R
p0.2
P
> 600 bar,
The counterpart
N
P
≤ 1000 bar
must be made from
N
steel in accordance
P
> 1000 bar,
N
with DIN 17440
P
≤ 1600 bar
N
with a strength of
R
p0.2
www.gemu-group.com
2
≥ 190 N/mm
.
2
≥ 260 N/mm
.
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