Honeywell DG-T Series, Operating Instructions Manual

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DG..T · Edition 01.22
EN-2
2 CHeCKInG tHe UsAGe
Gas pressure switches DG..T for monitoring increasing
and decreasing gas or air pressure.
type Positive pressure
negative
pressure
DG..T,
DG..FT
Gas, air, flue gas,
biogas
Air, flue gas
DG..HT,
DG..NT
Gas, air, flue gas,
biogas
Air, flue gas
DG..ST NH
3
, O
2
, air –
DG..NT and DG..HT lock off after switching. They can
be unlocked using the manual reset.
This function is only guaranteed when used within the
specified limits – see page 5 (10 Technical data).
Any other use is considered as non-compliant.
2.1 type code
DG
Pressure switch for gas
6 Adjusting range 0.2–2.4 “WC (0.5-6 mbar)
10 Adjusting range 0.4–4 “WC (1-10 mbar)
50 Adjusting range 1–20 “WC (2.5-50 mbar)
150 Adjusting range 12–60 “WC (30-150 mbar)
500
Adjusting range 40–200 “WC (100-500 mbar)
H Switches and locks off with rising pressure
n Switches and locks off with falling pressure
F Switches with falling positive pressure
s Switches with rising and falling positive
pressure; for O
2
, NH
3
and air; without approval
t T-product
G With gold-plated contacts
-2 Electrical connection via screw terminals,
1/2" NPT Conduit, NEMA 4 (IP 65)
-4
Electrical connection via screw terminals,
cable gland, NEMA 4 (IP 65)
-9 Electrical connection via 4-pin plug, with
socket, NEMA 4 (IP 65)
1 NPT connection 1x 1/4"
2
NPT connection 2x 1/4"
n Blue pilot lamp for 120 V AC
t2 Red/green pilot LED for 110 to 230 V AC
K2 Red/green pilot LED for 24 V DC/AC
A External adjustment
Letter H, N, F, S omitted = DG..T switches with rising pressure
2.2 Part designations
1
2
3
4
5
1 Upper housing section with cover
2 Lower housing section
3 Hand wheel
4 1/2" conduit coupling
5 Manual reset (DG..NT and DG..HT only)
2.3 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, me-
dium and switching properties, see page 5 (10
Technical data) und and the table on page 3 (5
Adjustment).
3 InstALLAtIon
CAUtIon
Please observe the following to ensure that the
DG..T is not damaged during installation and
operation:
– Dropping the device can cause permanent
damage. In this event, replace the entire device
and associated modules before use.
– Use approved sealing material only.
– Continuous operation with gases containing
more than 0.1 %-by-vol. H
2
S or ozone
concentrations exceeding 200 µg/m 3 accelerate
the ageing of elastomer materials and reduce
the service life.Check max. ambient temperature
– see page 5 (10 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
ps = SK ps =SK + 0,08 "WC ps = SK - 0,08 "WC
➔
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.