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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 3 (Tech-
nical data).
3 Connect an ohmmeter.
NO
2
COM
2
NO
3
NC
NO
2
1
COM
2
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 ohm-
meter and the pressure gauge.
Adjusting
Type
range*
[mbar]
DG 6
0.4 – 6
DG 10
1 – 10
DG 30
2.5 – 30
DG 50
2.5 – 50
DG 150
30 – 150
DG 400
50 – 400
DG 500 100 – 500
*
Adjusting tolerance = ± 15% of the scale value.
**
Mean switching differential at min. and max. setting.
▷ Deviation from the switching point during test-
ing pursuant to EN 1854 Gas and air pressure
switches: ± 15%. For DG 6: EN 1854 Air pressure
switches: ± 15% or ± 0.1 mbar.
▷ If the DG does not trip at the desired switching
point, correct the adjusting range using the hand
wheel. Relieve the pressure and repeat the process.
Tightness test
1 Shut off the downstream gas pipeline close to
the valve.
2 Open the valve and the gas supply.
▷ Check all used ports for tightness.
1
3
2
NC
COM
NO
1
3
NC
COM
1
3
NC
COM
Switching
Max. inlet
differential**
pressure
[mbar]
p
[mbar]
max
0.2 – 0.3
100
0.25 – 0.4
500
0.35 – 0.9
500
0.8 – 1.5
500
3 – 5
600
5 – 15
600
8 – 17
600
3
N
2
900 mbar
max. 2 bar
< 15 min
Maintenance
In order to ensure smooth operation: check the tight-
ness and function of the DG every year, or every six
months if operated with biogas.
▷ A function check can be carried out in case of
decreasing pressure control e.g. with the PIA.
▷ After carrying out the maintenance work, check
for tightness, see page 3 (Tightness test).
Technical data
Gas type: natural gas, town gas, LPG (gaseous),
flue gas, biogas (max. 0.1 %-by-vol. H
Max. inlet pressure p
see page 3 (Adjustment). Max. test pressure
for testing the entire system: temporarily < 15 min-
utes 2 bar.
Switching capacity:
U
DG
24 – 250 V AC 0.05 – 5 A
5 – 250 V AC 0.01 – 5 A
DG..G
5 – 48 V DC
Maximum medium and ambient temperatures:
-20 to +80°C.
Long-term use in the upper ambient temperature range
accelerates the ageing of the elastomer materials and
reduces the service life (please contact manufacturer).
Storage temperature: -20 to +40°C.
Diaphragm pressure switch, silicone-free.
Diaphragm: NBR.
Housing: glass fibre reinforced PBT plastic with
low gas release.
Lower housing section: AlSi 12.
Enclosure: IP 54 or IP 65. Safety class: 1.
Line diameter: 0.5 to 1.8 mm (AWG 24 to AWG 13).
Line entrance: M16 x 1.5, clamping range: diam-
eters of 4 to 10 mm.
Electrical connection type: screw terminals.
Max. tightening torque, see Technical Information
bulletin DG (D, GB, F) – www.docuthek.com.
Weight: 270 to 320 g.
Safety information, see Safety manual DG
(D, GB) – www.docuthek.com.
Designed lifetime
This information on the designed lifetime is based on
using the product in accordance with these operat-
ing instructions. Once the designed lifetime has been
reached, safety-relevant products must be replaced.
Designed lifetime (based on date of manufacture) in
accordance with EN 13611, EN 1854 for pressure
switches:
GB-3
4
S) and air.
2
= withstand pressure,
max
I (cos φ = 1) I (cos φ = 0,6)
0.05 – 1 A
0.01 – 1 A
0.01 – 1 A
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