Krom Schroder DGH, DGN, DGI Operating Instructions Manual

F

NL

I

E

057 · Edition 08.

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TR CZ PL RUS H

DK S N P GR

➔ www.docuthek.com

Operating instructions

Pressure switches for gas DG..H, DG..N Pressure switch for gas DG..I

Translation from the German

© 2012 Elster GmbH

Contents

Contents

Pressure switches for gas DG..H, DG..N

Pressure switch for gas DG..I .............

Contents ..............................

Safety.................................

Checking the usage .....................

Type code .............................2

Part designations ........................2

Type label.............................. 2

Installation ............................

Connection facilities ......................3

Installing DG..H, DG..N ...................3

Installing DG..I ..........................4

Wiring ................................4

Adjustment ............................5

Tightness test ..........................5

Maintenance ...........................5

Accessories ...........................5

Technical data .........................7

Designed lifetime ........................8

Declaration of conformity ................8

Contact ...............................8

Safety

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

• ,  ,  ,  ... = Action

▷ = Instruction

Liability

We will not be held liable for damages resulting
from non-observance of the instructions and non­compliant 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.

Transport

On receipt of the product, check that the delivery is
complete (see Part designations). Report any trans­port damage immediately.

Storage

Store the product in a dry place. Ambient tempera­ture: see Technical data.

GB

GB-1

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Checking the usage

-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6

Increasing

DG..H, DG..N, DG..I

For monitoring increasing and decreasing gas or
air pressure.

negative pressure
Decreasing

negative pressure

Increasing pressure

Decreasing pressure

Type label

D-49018 Osnabrück, Germany

DG


CE – 0085AP0467

2

1

3

Positive

pressure

DG..H,
DG..N

GB

DG..I Air, flue gas

Gas, air, flue
gas

Negative
pressure

Differential

pressure

Air, flue gas Air, flue gas

Gas, air, flue
gas

Air, flue gas

DG..H switches and locks off with rising pressure,

DG..N switches and locks off with falling pressure.
They can be unlocked using the manual reset.
This function is only guaranteed when used within

the specified limits– see page 7 (Technical data).

Any other use is considered as non-compliant.

Type code

Code Description

DG Pressure switch for gas
,5 – 500 Max. setting in mbar
H
N
I

Locks off with rising pressure

Locks off with falling pressure

Negative pressure for gas

G With gold-plated contacts

-

-4

-5

-6

-9
K
T
T
N

4-pin plug, with socket, IP 65

Red/green pilot LED for 24 V DC/AC

Red/green pilot LED for 230 V AC

Electrical connection

via screw terminals

via screw terminals, IP 65

4-pin plug, without socket

4-pin plug, with socket

Blue pilot lamp for 230 V AC

Blue pilot lamp for 120 V AC

A External adjustment

Part designations

2

1

5

3

4

 Upper housing section with cover

 Lower housing section

 Hand wheel

4 M16 cable gland

5 DG..H, DG..N with manual reset

Max. inlet pressure, mains voltage, ambient tem-

perature, enclosure: see type label.

Installation

CAUTION

Please observe the following to ensure that the DG
is not damaged during installation and operation:

– Continuous operation at high temperatures accel-

erates the ageing of elastomer materials. In places
where a high thermal capacity is required, thermal
equipment trips must be installed upstream of

theDG.
– Use approved sealing material only.
– Check max. ambient temperature – see

page7 (Technical data).
– When using silicone tubes, only use silicone tubes

which have been sufficiently cured.
– Vapours containing silicone must not be allowed

to get into the housing.
– Condensation must not be allowed to get into the

housing. At subzero temperatures malfunctions/

failures due to icing can occur.
– The service life will be shorter if subject to ozone

concentrations exceeding 200μg/m3. When in-

stalling outdoors, place the DG in a roofed area

and protect from direct sunlight (even IP65 ver-

sion). To avoid condensation, a cover with pres-

sure equalization element (see page6 (Pres-

sure equalization element)) can be used.
– Avoid subjecting the DG to strong or violent vibra-

tions.
– In case of highly fluctuating pressures, install a

restrictor orifice (see page6 (Restrictor orifice)).

▷

The DG must not be in contact with masonry.

Minimum clearance 20mm.

▷ Ensure that there is sufficient installation space.
▷ Ensure unobstructed view of the hand wheel.
▷ Installation position as required, preferably with

vertical diaphragm. Then the switching pointpS
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.

GB-2

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Positive pressure measurement at port

2

p

max

=

600 mbar

Rp 1/4

1

3

Rp 1/8

4

p

max

=

-600 mbar

5 Seal port.

p

= SK pS = SK + 0.18 mbar pS = SK - 0.18 mbar

S

= SK pS = SK - 0.5 mbar

p

S

= SK pS = SK - 0.2 mbar

p

S

= SK

p

S

= SK

p

S

DG..H, DG..N

DG 18I

DG 120I, DG 450I

DG 1,5I

Negative pressure:

p

= SK - 0.4 mbar

S

Positive pressure:

p

= SK + 0.4 mbar

S

DG 12I

Negative pressure:

p

= SK - 0.5 mbar

S

Positive pressure:

p

= SK + 0.5 mbar

S

Connection facilities

2

1

3

▷

Ports and 4 are suitable for air and flue gas only.

▷

If the electrical contacts in the DG could be soiled

1 and 2
Gas, air, flue gas

3 and 4

4

Air, flue gas

by dirt particles in the surrounding air or in the
medium, use a filter pad (see page5 (Filter
pad set)) at port/4. On IP65 units, the filter pad
is fitted as standard, see type label.

 Disconnect the system from the electrical power

supply.

 Shut off the gas supply.
 Ensure that the pipeline is clean.
4 Purge the pipe.

Installing DG..H, DG..N

Positive pressure measurement at port
5 Seal port.

2

1

Rp 1/4

p

=

max

600 mbar

0

2

1

Rp 1/4

2

p

=

max

600 mbar

Rp 1/4

p

=

max

Negative pressure measurement at port4
5 Seal port.

Rp 1/8
p

=

max

4

-600 mbar

3

Negative pressure measurement at port
5 Seal port4.

0

4

3

3

p

=

max

-600 mbar

Differential pressure measurement

▷ Use port  or  for the higher absolute pressure

and port  or 4 for the lower absolute pressure.

5 Seal the remaining ports.

600 mbar

∆p

max

600 mbar

∆p

=

max

=

Rp 1/8

3

1

1

3

GB

GB-3