GB-3
D
GB
F
NL
I
E
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.
NO
C = 1 µF
2
NC
1
COM
3
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.
COM
3
NC
1
NO
2
NO
2
NC
1
COM
3
L1
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-
3
Connect an ohmmeter.
NO
2
NC
1
COM
3
COM
3
NC
1
NO
2
0
1 cm = 1 mbar
4
Set the switching point using the hand wheel.
5
Connect a pressure gauge.
NO
2
NC
1
COM
3
COM
3
NC
1
NO
2
0
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
max.
= 300 mbar = withstand
pressure.
Type
Adjusting
range*
[mbar]
Reset pres-
sure** [mbar]
DL 10..H, ..N
1 – 10
0.4 – 1
DL 50..H, ..N
2.5 – 50
1 – 2
DL 150..H, ..N
30 – 150
2 – 5
* Adjusting tolerance = ± 15% of the scale value.
