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Type label
For detailed information on the adjusting range, mean
switching differential, max. inlet pressure, lock-off,
medium and switching properties, see page 5
(Technical data) and the table on page 3 (Ad-
justment).
Installation
CAUTION
Please observe the following to ensure that the
DG..T is not damaged during installation and op-
eration:
–
Continuous operation with gases containing
more than 0.1 %-by-vol. H
centrations exceeding 200 µg/m
the ageing of elastomer materials and reduce
the service life.
–
Use approved sealing material only.
–
Dropping the device can cause permanent dam-
age. In this event, replace the entire device and
associated modules before use.
–
Check max. ambient temperature – see
page 5 (Technical data).
–
When using silicone tubes, only use silicone
tubes which have been sufficiently cured.
–
Vapours containing silicone can adversely affect
the functioning of electrical contacts.
–
Condensation or vapours containing silicone
must not be allowed to get into the housing.
At subzero temperatures, malfunctions/failures
due to icing can occur.
–
When installing outdoors, place the DG..T in
a roofed area and protect from direct sunlight
(even IP 65 version).
–
Avoid strong impact on the unit.
▷ Installation position as required, preferably with
vertical diaphragm. Then the switching point p
corresponds to the scale value SK set on the
hand wheel. In other installation positions, the
switching point p
S
correspond to the scale value SK set on the
hand wheel. Check the switching point.
p s = SK
p s =SK + 0,08 "WC
Approval and type: see
type label.
S or ozone con-
2
3
accelerate
will change and no longer
p s = SK - 0,08 "WC
CAUTION
If port 4 is at the top, IP 65 will not be satisfied.
▷ The DG..T must not be in contact with masonry.
Minimum clearance 1" (25 mm).
▷ Ensure that there is sufficient installation space.
▷ Ensure unobstructed view of the hand wheel.
1 Disconnect the system from the electrical power
supply.
2 Shut off the gas supply.
3 Ensure that the pipeline is clean.
Ports
4
1
2 *
Positive
pressure
DG..T
Negative
pressure
DG..T
Differential
1 or 2* for higher absolute pressure.
pressure
4 for lower absolute pressure.
DG..T
* Port 2 only on DG..T..2 with 2x ¼" NPT connections..
CAUTION
Port 4 connects the upper diaphragm chamber
with the micro switch. Do not connect port 4 to
pipes carrying gas.
▷ The pressure switches are supplied with an inte-
grated vent limiter. In the event of a diaphragm
tear, the vent limiter limits the escape of gas
to less than 1.0 CFH of natural gas at 2.8 psi
(DG..6T) or 7 psi (DG..10T – DG..500T). If neces-
S
sary, port 4 (1/8" NPT) can be used to connect
the venting line.
▷ A filter pad at port 4 protects the electrical contacts
in the DG..T from dirt particles in the surrounding
air or in the medium.
▷ Filter pad for port 4, see PartDetective.
USA-2
4
IP 65
1 or 2 for
positive pressure (¼" NPT)
4 for
negative pressure (
/
" NPT)
1
8
Connect
Free
1 or 2*
4
4
1 or 2*
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