DL..H, DL..N · Edition 05.22
EN-4
4 WIRInG
Pressure switch DL..H, DL..N 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” apparatus pursuant to EN 60079-11 (VDE 0170-
7):2012.
DL..H, DL..N as “simple electrical apparatus” pursuant
to EN 60079-11:2012 corresponds to the Temperature
class T6, Group II. The internal inductance/capacitance
is Li = 0.2 μH/Ci = 8 pF.
➔
If the pressure switch has switched a voltage > 24 V
(> 30 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.
CAUtIon
– To ensure that the DL..H, DL..N is not damaged
during operation, note the switching capacity,
see page 6 (8 Technical data).
In the case of low switching capacities, such as 24 V,
8 mA, for example, we recommend using an RC mod-
ule (22 Ω, 1 μF) in air containing silicone or oil.
NO
C = 1 µF
R = 22 Ω
2
NC
1
COM
3
1
Disconnect the system from the electrical power
supply.
2
3
4
5
M16 x 1,5:
ø 4–10 mm
6
Wire as shown on the connection diagram.
7
Tighten the M16 gland) (1/2" NPT conduit).
➔
Contacts 3 and 2 close when subject to increasing
pressure. Contacts 1 and 3 close when subject
to falling pressure. With the NO contact, the NC
contact is omitted.
COM
3
NC
1
NO
2
NO
2
NC
1
COM
3
L1
5 ADJUstMent
➔
The switching point is adjustable via hand wheel.
1
Disconnect the system from the electrical power
supply.
2
Unscrew the housing cover.
➔
Once the settings have been adjusted successfully,
fit the housing cover again. Note the tightening
torques, see page 6 (8 Technical data).
3
Connect an ohmmeter.
COM
3
NC
1
NO
2
NO
2
NC
1
COM
3
4
Set the switching point using the hand wheel.
5
Connect a pressure gauge.
6
0
1 cm = 1 mbar
(0.4" = 0.4"WC)
7
Apply pressure. In doing so, monitor the switching
point on the ohmmeter and the pressure gauge.
8
If the DL..H, DL..N does not trip at the desired
switching point, correct the adjusting range using
the hand wheel. Relieve the pressure and repeat
the process.
5.1 Adjusting range
type
Adjust-
ing
range
1)
[mbar]
Max.
inlet
pres-
sure
2)
[mbar]
Reset
pres-
sure
3)
[mbar]
DL 10..H,
DL 10..N
1–10
300
0.4–1
DL 50..H,
DL 50..N
2.5–50
300
1–2
DL 150..H,
DL 150..N
30–150
300
2–5
type
Adjust-
ing
range
1)
["WC]
Max.
inlet
pres-
sure
2)
["WC]
Reset
pres-
sure
3)
["WC]
DL 10..H,
DL 10..N
0.4–4
117
0.16–
0.4
DL 50..H,
DL 50..N
1–20
117
0.4–0.8
DL 150..H,
DL 150..N
12–60
117
0.8–2
1) Adjusting tolerance = ± 15% of the scale value.
2) Max. inlet pressure = withstand pressure.
3) Difference between switching pressure and possible
reset.
Deviation from the switching point during testing pur-
suant to EN 1854 Air pressure switches: ± 15%.
