Honeywell DG T, DG NT, DG FT, DG ST Operating Instructions Manual

USA

CAN

MEX

D

03251549

USA CAN MEX

➔ www.docuthek.com

Operating instructions

Pressure switches for gas DG..T

© 2018 Elster GmbH · Edition 09.18

Cert. version 05.18

Translation from the German

Safety

Please read and keep in a safe place

Please read through these instructions
carefully before installing or operating. Following the
installation, pass the instructions on to the opera­tor. This unit must be installed and commissioned
in accordance with the regulations and standards
in force. These instructions can also be found at
www.docuthek.com.

Explanation of symbols

• , 1 , 2 , 3 ... = Action

▷ = Instruction

Liability

We will not be held liable for damage resulting from
non-observance of the instructions and non-com­pliant use.

Safety instructions

Information that is relevant for safety is indicated in
the instructions as follows:

DANGER

Indicates potentially fatal situations.

WARNING

Indicates possible danger to life and limb.

CAUTION

Indicates possible material damage.

All interventions may only be carried out by qualified
gas technicians. Electrical interventions may only be
carried out by qualified electricians.

Conversion, spare parts

All technical changes are prohibited. Only use OEM
spare parts.

Checking the usage

Gas pressure switches DG..T for monitoring increas­ing and decreasing gas or air pressure.

DG..T,
DG..FT

DG..HT,
DG..NT

DG..ST NH

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 (Technical data). Any
other use is considered as non-compliant.

Type code

Code Description

DG Gas pressure switch
6 – 500 Max. setting in mbar

F*
H*
N*
S*

T T-product
G With gold-plated contacts

-2

-4

-9
1
2
K2
T2

Red/green pilot LED for 110 to 230 V AC

N
A External adjustment

* If “none”, this specification is omitted; DG..T

switches with rising pressure.

Part designations

1 Upper housing section with cover
2 Lower housing section
3 Hand wheel
4 ½" NPT conduit coupling
5 Manual reset

(DG..NT and DG..HT only)

Positive

pressure

Gas, air, flue gas,
biogas

Gas, air, flue gas,
biogas

, O2, air –

3

Negative
pressure

Air, flue gas

Air, flue gas

Switches with falling pressure

Locks off with rising pressure

Locks off with falling pressure

Switches with rising and falling pressure;

for NH

, O2 (without approval)

3

Electrical connection

via screw terminals

via screw terminals, IP65

4-pin plug, with socket, IP65

1x ¼" NPT connection

2x ¼" NPT connections

Red/green pilot LED for 24 V DC/AC

Blue pilot lamp for 120 V AC

2

1

5

3

4

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Type label

4

USA

Approval and type: see

DG T

type label.

CAUTION

If port 4 is at the top, IP65 will not be satisfied.

IP 65

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. H2S or ozone con­centrations exceeding 200µg/m3 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

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pS will change and no longer
correspond to the scale valueSK set on the
hand wheel. Check the switching point.

▷ 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

1 or 2 for

-

4

1

2 *

positive pressure (¼" NPT)

4 for
negative pressure (

Connect Free
Positive
pressure

1 or 2* 4

DG..T
Negative
pressure

4 1 or 2*

DG..T
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

S

(DG..6T) or 7 psi (DG..10T – DG..500T). If neces­sary, 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.

1

/8" NPT)

ps = SK

ps =SK + 0,08 "WC ps = SK - 0,08 "WC

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3 42

NO

NO

2

NC

1

COM

3

COM

3

NC

1

NO

2

Wiring

CAUTION

To ensure that the DG..T is not damaged during op-

eration, note the switching capacity, see page5
(Technical data).

▷ In the case of low switching capacities, such as

24V, 8mA, for example, we recommend using
an RCmodule (22 Ω, 1μF) in air containing
silicone or oil.

1 Disconnect the system from the electrical power

supply.

5

½" NPT Conduit:

ø 0.4" (10 mm)

2

NO

NC

1

3

COM

2

NO

1

NC

3

COM

½" NPT

▷

DG..FT, DG..NT: the NO-to-COM connection
is interrupted if the pressure drops (contacts 3
and 2 open).

DG..T, DG..HT: the NC-to-COM connection is

interrupted if the pressure rises (contacts 3 and

1 open).

Adjustment

▷

The switching point is adjustable via hand wheel.

1 Disconnect the system from the electrical power

supply.

2 Detach the housing cover.

▷

Tightening torques, see Technical Information

bulletin DG at www.docuthek.com.

3 Connect an ohmmeter.

NO

NC

COM

2

3

1

2

NC

1

3

COM

6 Apply pressure. In doing so, monitor the ohm-

Pressure switches without manual reset
(DG..T, DG..FT, DG..ST)

Pressure switches with manual reset
(DG..HT, DG..NT)

1)

* Adjusting tolerance = ±15% of the scale value.
** Difference between switching pressure and pos-

0

0.4" = 0.4"WC
(1 cm = 1 mbar)

meter and the pressure gauge.

Type

DG 6T

DG 10T

DG 50T

DG 150T

DG 500T

Adjusting

range*

"WC

(mbar)

0.2 – 2.4
(0.5 – 6)

0.4 – 4

(1 – 10)

1 – 20

(2.5 – 50)

12 – 60

(30 – 150)

40 – 200

(100 – 500)

Mean

switching

differential

at min.

and max.

setting

"WC

(mbar)

0.08 – 0.12
(0.2 – 0.3)

0.1 – 0.16
(0.25 – 0.4)

0.4 – 0.8
(1 – 2)

1.2 – 2
(3 – 5)

3.2 – 6.8
(8 – 17)

Max. inlet

pressure p

psi (mbar)

No

venting

line

2.4 psi
(165)

7 psi
(480)

max.

With

venting

line

8.5 psi
(600)

Max. inlet

pressure p

psi (mbar)

No

venting

line

7 psi
(480)

max.

With

venting

line

8.5 psi
(600)

Type

DG 10T

DG 50T

DG 150T

DG 500T

Adjusting

range*

"WC

(mbar)

0.4 – 4
(1 – 10)

1 – 20

(2.5 – 50)

12 – 60

(30 – 150)

40 – 200

(100 – 500)

Reset

pressure**

"WC

(mbar)

0.16 – 0.4
(0.4 – 1)

0.4 – 0.8
(1 – 2)

0.8 – 4.8

(2 – 12)

2 – 7.2

(5 – 18)

Connect the venting line to port 4. Connections,

see page 2 (Installation).

sible reset.

▷ If the DG..T does not trip at the desired switch-

ing point, correct the adjusting range using the
hand wheel. Relieve the pressure and repeat
the process.

USA

1)

1)

4 Set the switching point using the hand wheel.
5 Connect a pressure gauge.

USA-3

CAN

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Pressure switches with manual

1

reset

USA

▷

DG..NT locks off if the pressure drops to the

value set using the hand wheel.

▷

DG..HT locks off if the pressure rises to the value
set using the hand wheel.

1 Reset the pressure switch using the manual reset.

▷ Requirement for reset:

DG..NT: the pressure must have risen at least
to the set switching point plus the pressure dif­ferential between the switching pressure and
possible lock-off.

DG..HT: the pressure must have dropped at least

to the set switching point minus the pressure
differential between the switching pressure and
possible lock-off.

▷ For details of the pressure differential between

the switching pressure and possible reset, see
table on page3 (Adjustment).

Accessories

LED set, red/green

2

+

NO

2

3 COM

1 NC

NO

3

1

2

NC

4

3

COM

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.

3 4

N

2

13 psi
max. 29 psi
< 15 min

Maintenance

In order to ensure smooth operation, check the tight­ness and function of the DG..T every year, or every
six months if operated with biogas

.

–

N

24 V DC, I = 16 mA; 24 V AC, I = 8 mA,
Order No.: 74921089.

110 to 230 V AC,

Order No.: 74923275.

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Pilot lamp set, blue

1

2

COM

N

NO

NO

2

3

L1

3

2

1

NC

L1

3

COM

1

NC

N

NO

NC

NO

NO

1

2

NC

1

2

NC

4

3

COM

N

3

COM

N

110/120 V AC, I = 1.2 mA,

Order No.: 74916121.

Further information about accessories can be found
in Technical Information bulletin DG (identical to
DG..T)– www.docuthek.com

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).

= withstand pressure,

max.

Max. test pressure for testing the entire system: tem­porarily (<15minutes) 29psi (2bar).
Switching capacity:

DG..T

U I (

max. 240 V AC max. 5 A max. 0.5 A

cos φ = 1)

DG..TG* < 30 V AC/DC max. 0.1 A max. 0.05 A

*

With gold contacts

Maximum medium and ambient temperatures:

-40 to +140°F (-40 to +60°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).

The set switching point may palpably change in me-

dia and ambient temperatures below -22°F (-30°C).
Storage temperature: -4 to +104°F
(-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65. Safety class: 1.
Cable diameter: AWG24 to AWG13
(0.02 to 0.07" (0.5 to 1.8mm)).
Line entrance: ½" NPT conduit.
Electrical connection type: screw terminals.
Max. tightening torque, see Technical Information
bulletin DG.
Safety information, see Safety manual DG (identi­cal to DG..T)– www.docuthek.com.
Weight: 9.5 to 11.3 oz (270 to 320 g).

Dimensions

S) and air.

2

I (

cos φ = 0.6)

USA

2.76"

(70 mm)

0.43"
(11 mm)

3"

(76 mm)

1/2" NPT

USA-5

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Logistics

Transport

USA

Protect the unit from external forces (blows, shocks,
vibration). On receipt of the product, check that the
delivery is complete, see page1 (Part designa­tions). Report any transport damage immediately.

Storage

Store the product in a dry and clean place.
Storage temperature: see page5 (Technical data).

Packaging

The packaging material is to be disposed of in

accordance with local regulations.

Disposal

Components are to be disposed of separately in
accordance with local regulations.

Certification

Directive on the restriction of the use of
hazardous substances (RoHS) in China

Scan of the Disclosure Table China RoHS2– see
certificates at www.docuthek.com

FM approved

Factory Mutual Research Class: 3510 Flow and pres­sure safety switches.
Designed for applications pursuant to NFPA 85 and
NFPA 86.

UL listed

UL 353 Limit control.
Underwriters Laboratories

Contact

If you have any technical questions, please contact
your local branch office/agent. The addresses are
available on the Internet or from ElsterGmbH.

We reserve the right to make technical modifications
in the interests of progress.

Strotheweg 1, D-49504 Lotte (Büren)

Elster GmbH

Tel. [phone]

Fax [phone]

[e-mail], www.kromschroeder.com

USA-6