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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
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
page 3 (Technical data).
–
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
corresponds to the scale value SK set on the
hand wheel. In other installation positions, the
switching point p
S
correspond to the scale value SK set on the
hand wheel. Check the switching point.
p s = SK
p s =SK + 0,18 mbar p s = 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.
1 and 2
2
Positive pressure (Rp ¼)
1
3
3 and 4
4
Negative pressure (Rp
S or ozone con-
2
will change and no longer
)
1 /8
Positive pres-
sure DG..U
Negative pres-
sure DG..U
Differential pres-
sure DG..U
Positive pressure
DG..B
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
S
is not damaged during operation:
–
Note the switching capacity, see page 3
(Technical data).
▷
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.
2
5
M16 x 1,5:
ø 4–10 mm
▷ Contacts 3 and 2 close when subject to increas-
ing pressure. Contacts 1 and 3 close when sub-
ject to falling pressure.
GB-2
Connect
Seal
1
2
2
1
3
4
4
3
1 or 2 for higher absolute pressure.
3 or 4 for lower absolute pressure.
Seal the ports that are not in use.
1
–
3
4
6
7
Free
3 or 4
3 or 4
1 or 2
1 or 2
–
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