GB-2
D
GB
F
NL
I
E
Installation
CAUTION
Please observe the following to ensure that the DG
is not damaged during installation and operation:
– Continuous operation with gases containing
more than 0.1 %-by-vol. H
2
S or ozone con-
centrations exceeding 200 µg/m³ accelerate
the ageing of elastomer materials and reduce
the service life.
– Use approved sealing material only.
–
Dropping the device can cause permanent dam-
age. In this event, replace the entire device and
associated modules before use.
– Check max. ambient temperature – see
– When using silicone tubes, only use silicone
tubes which have been sufficiently cured.
– Vapours containing silicone can adversely affect
the functioning of electrical contacts.
– Condensation or vapours containing silicone
must not be allowed to get into the housing.
At subzero temperatures malfunctions/failures
due to icing can occur.
–
When installing outdoors, place the DG in a
roofed area and protect from direct sunlight
(even IP 65 version). To avoid condensation, a
cover with pressure equalization element (Order
No. 74923391) can be used.
– Avoid strong impact on the unit.
– In case of highly fluctuating pressures, install a
restrictor orifice (Order No. 75456321).
▷
Installation position as required, preferably with
vertical diaphragm. Then the switching point p
S
corresponds to the scale value SK set on the
hand wheel. In other installation positions, the
switching point p
S
will change and no longer
correspond to the scale value SK set on the
hand wheel. Check the switching point.
ps = SK
ps =SK + 0,18 mbar ps = SK - 0,18 mbar
▷
The DG must not be in contact with masonry.
Minimum clearance 20 mm.
▷
Ensure that there is sufficient installation space.
▷
Ensure unobstructed view of the hand wheel.
1
Disconnect the system from the electrical power
supply.
2
Shut off the gas supply.
3
Ensure that the pipeline is clean.
2
1
3
4
1
and
2
Positive pressure (Rp ¼)
3
and
4
Negative pressure (Rp
1/8
)
Connect
Seal
Free
Positive pres-
sure DG..U
1
2
3
or
4
2
1
3
or
4
Negative pres-
sure DG..U
3
4
1
or
2
4
3
1
or
2
Differential pres-
sure DG..U
1
or
2
for higher absolute pressure.
3
or
4
for lower absolute pressure.
Seal the ports that are not in use.
Positive pressure
DG..B
1
–
–
4
If the electrical contacts in the DG could be soiled
by dirt particles in the surrounding air or in the
medium, use a filter pad (Order No. 74946199)
at port
3
/
4
. On IP 65 units, the filter pad is fitted
as standard, see type label.
Wiring
▷
If the DG..G has switched a voltage > 24 V and a
current > 0.1 A at cos φ = 1 or > 0.05 A at cos φ =
0.6 once, the gold plating on the contacts will have
been burnt through. It can then only be operated at
this power rating or higher power rating.
▷
Pressure switch DG can be used in Zone 1
(21) and 2 (22) hazardous areas if an isolating
amplifier is installed upstream in the safe area
as “Ex-i” equipment pursuant to EN 60079-11
(VDE 0170-7):2012.
▷
DG as “simple electrical equipment” pursuant to
EN 60079-11:2012 corresponds to the Tempera-
ture class T6, Group II. The internal inductance/
capacitance is Li = 0.2 μH/Ci = 8 pF.
CAUTION
Please observe the following to ensure that the DG
is not damaged during operation:
– Note the switching capacity, see page 3
▷
In the case of low switching capacities, such as
24 V, 8 mA, for example, we recommend using an
RC module (22 Ω, 1 μF) in air containing silicone or oil.
1
Disconnect the system from the electrical power
supply.
M16 x 1,5:
ø 4–10 mm
3
4
2
5
6
7
▷
Contacts
3
and
2
close when subject to increas-
ing pressure. Contacts
1
and
3
close when sub-
ject to falling pressure.
