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Negative pressure measurement
▷ 3 or 4 = negative pressure port (-).
▷ 1 or 2 = remains open to ventilate the upper
diaphragm chamber.
Differential pressure measurement
▷ 1 or 2 = port for the higher positive pressure or
lower negative pressure (+).
▷ 3 or 4 = port for the lower positive pressure or
higher negative pressure (-).
3 Seal the ports that are not in use.
Wiring
▷ If the DL..G has switched a voltage > 24 V and
a current > 0.1 A 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 DL can be used in Zone 1 (21)
and 2 (22) hazardous areas if an isolating am-
plifier is installed upstream in the safe area as
"Ex-i" equipment pursuant to EN 60079-11
(VDE 0170-7):2012.
▷ DL 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
To ensure that the DL is not damaged during opera-
tion, note the switching capacity, see page 5
(Technical data).
▷ In the case of low switching capacities, such as
24 V, 8 mA, for example, we recommend us-
ing an RC module (22 Ω, 1 μF) in air containing
silicone or oil.
C = 1 µF
NO
2
NC
1
1 Disconnect the system from the electrical power
supply.
COM
3
GB-3
2
3
5
6
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.
L1
3
COM
2
1
NO
NC
Adjustment
▷ The switching point is adjustable via hand wheel.
1 Disconnect the system from the electrical power
supply.
2 Detach the housing cover, see page 5 (Tech-
nical data).
3 Connect an ohmmeter.
NO
2
COM
2
NO
3
NC
NO
1
2
2
COM
NO
3
NC
1
4 Set the switching point using the hand wheel.
5 Connect a pressure gauge.
0
0
1 cm = 1 mbar
1 cm = 1 mbar
6 Apply pressure. In doing so, monitor the switching
point on the ohmmeter and the pressure gauge.
▷ Max. inlet pressure p
pressure.
Adjusting
Type
range*
[mbar]
DL 10..H, ..N
1 – 10
DL 50..H, ..N
2.5 – 50
DL 150..H, ..N
30 – 150
* Adjusting tolerance = ± 15% of the scale value.
4
7
1
3
2
NC
COM
NO
1
3
NC
COM
1
3
NC
COM
= 300 mbar = withstand
max.
Reset pres-
sure** [mbar]
0.4 – 1
1 – 2
2 – 5
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