USA-2
USA
CAN
MEX
D
Type label
DG T
Approval and type: see
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
2
S or ozone con-
centrations exceeding 200 µg/m
3
accelerate
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
– 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
S
corresponds to the scale value SK set on the
hand wheel. In other installation positions, the
switching point p
S
will change and no longer
correspond to the scale value SK set on the
hand wheel. Check the switching point.
ps = SK
ps =SK + 0,08 "WC ps = SK - 0,08 "WC
CAUTION
If port
4
is at the top, IP 65 will not be satisfied.
4
IP 65
▷
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
2 *
1
4
1
or
2
for
positive pressure (¼" NPT)
4
for
negative pressure (
1
/
8
" NPT)
Connect
Free
Positive
pressure
DG..T
1
or
2*
4
Negative
pressure
DG..T
4
1
or
2*
Differential
pressure
DG..T
1
or
2*
for higher absolute pressure.
4
for lower absolute pressure.
* 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-
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.
