DL..A, DL..K · Edition 02.22
EN-2
2 CHeCKInG tHe UsAGe
DL 1,5–3A, DL 3K, DL 5–150A, DL 5–150K
For monitoring positive, negative or differential pres-
sures of air, flue gas or other non-aggressive gases.
This function is only guaranteed when used within the
specified limits – see page 7 (8 Technical data). Any
other use is considered as non-compliant.
2.1 type code
DL
Pressure switch for air
1,5
Adjusting range -0.5 – +1.5 mbar
3
Adjusting range 0.2–3 mbar
5
Adjusting range 0.4–5 mbar
10
Adjusting range 1.0–10 mbar
30
Adjusting range 2.5–30 mbar
50
Adjusting range 2.5–50 mbar
150
Adjusting range 30–150 mbar
A
Rp 1/4 connection, tube connection,
hand wheel
K
With tube connection, hand wheel
t
T-product
G
With gold contacts
-2
Electrical connection via screw terminals
(UL listed), IP 54
-3
Electrical connection via screw terminals, IP 54
-4
Electrical connection via screw terminals, IP 65
-5
Electrical connection via 4-pin plug,
without socket, IP 54
-6
Electrical connection via 4-pin plug, with
socket, IP 54
-9
Electrical connection via 4-pin plug, with
socket, IP 65
K2
Red/green pilot LED for 24 V DC/AC
t
Blue pilot lamp for 230 V AC
t2
Red/green pilot LED for 110 to 230 V
AC
n
Blue pilot lamp for 120 V AC
P
With test tapping point
1
With 1 test key
2
With 2 test keys
A
External adjustment
W
Z-angle bracket
2.2 Part designations
1
2
2
3
4
1
Upper housing section with cover
2
Lower housing section
3
Hand wheel
4
M16 cable gland/1/2" NPT conduit
2.3 type label
DL
CE
2
1
3
D-49018 Osnabrück, Germany
Max. inlet pressure = withstand pressure, mains volt-
age, ambient temperature, enclosure: see type label.
3 InstALLAtIon
CAUtIon
Please observe the following to ensure that the
unit is not damaged during installation:
– Dropping the device can cause permanent
damage. In this event, replace the entire device
and associated modules before use.
– Use approved sealing material only.
– Condensation must not be allowed to get into
the housing. If possible, install pipework with an
ascending gradient. Otherwise, there is a risk of
icing of condensation at subzero temperatures,
the switching point shifting or corrosion in the
device which can lead to malfunctions.
– Protect the connections against dirt or moisture
in the medium to be measured or the surround-
ing air. If necessary, install a filter.
– In case of highly fluctuating pressures, install a
damping nozzle/restrictor orifice.
– When installing outdoors, place the pressure
switch in a roofed area and protect from direct
sunlight (even IP 65 version). To avoid conden-
sation, the cover with pressure equalization
element can be used. See
– In the case of an uneven mounting surface,
secure the pressure switch to the mounting
plate or air duct with only two screws on the
same side in order to avoid subjecting the
pressure switch to mechanical stress.
– Vapours containing silicone can adversely affect
the functioning of electrical contacts. When
using silicone tubes, only use silicone tubes
which have been sufficiently cured.
– In the case of high humidity, we recommend
using a pressure switch with gold contact due
to its higher resistance to corrosion. Closed-cir-
cuit current monitoring is recommended under
difficult operating conditions.
➔
Ensure that there is sufficient installation space.
➔
Ensure unobstructed view of the hand wheel.
