Krom Schroder DG..S Operating Instructions Manual

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03251233

03251233

➔ www.docuthek.comD GB F NL I E

Operating instructions

Pressure switches for gas DG..S for NH3 and O2

© 2012 Elster GmbH · Edition 08.12

Translation from the German

Contents

Contents

Pressure switches for gas DG..S for NH3

and O2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Checking the usage . . . . . . . . . . . . . . . . . . . . . 2

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

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

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

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Tightness test . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Technical data . . . . . . . . . . . . . . . . . . . . . . . . . 4

Declaration of conformity . . . . . . . . . . . . . . . . 4

Contact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Safety

Safety

Please read and keep in a safe place

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 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:

Please read through these instructions

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.

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Checking the usage

DG

To monitor rising and falling pressure.

DG..S

This function is only guaranteed when used within

the specified limits– see page4 (Technical data).
Any other use is considered as non-compliant.

Type code

Code Description

DG Gas pressure switch
6 – 500 Max. setting in mbar
S Positive pressure (NH
G With gold-plated contacts

-3

-4

-5

-6

-9
K2
T
T2
N
A External adjustment

Part designations

1 Upper housing section with cover

2 Lower housing section
3 Hand wheel
4 M16 cable gland

Positive

pressure

NH

3

air

, O2,

Negative pres-

sure

– –

Electrical connection

via screw terminals

via screw terminals, IP 65

4-pin plug, without socket

4-pin plug, with socket

4-pin plug, with socket, IP 65

Red/green pilot LED for 24 V DC/AC

Blue pilot lamp for 230 V AC

Red/green pilot LED for 230 V AC

Blue pilot lamp for 120 V AC

3

2

1

4

Differential

pressure

, O2)

3

Installation

CAUTION

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

– As the temperature increases, the diffusion rate

of NH3 through the diaphragm also increases
which can cause corrosion of the contacts. For
this reason, query the closed contacts for opening.

– The medium NH3 must not condense as this can

lead to increased corrosion of the lower section
(pressure supply can become blocked) and de­formation of the diaphragm (causing the switching
point to shift).

– 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4 (Technical data).
– Condensation or vapours containing silicone 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, the cover with pres-

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

tions.

▷ 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.

S

Type label

Max. inlet pressure, mains voltage, ambient tem­perature, enclosure: see type label.

D-49018 Osnabrück, Germany

DG

2

3

1

ps = SK

▷

The DG must not be in contact with masonry.

ps = SK + 0,18 mbar

ps = SK - 0,18 mbar

Minimum clearance 20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 medium supply.
3 Ensure that the pipeline is clean.

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3 42

▷

NO

2

NC

1

COM

3

COM

3

NC

1

NO

2

Contacts 3 and 2 close when subject to increas-

1

Positive pressure

1

(Rp ¼)

4

4

Atmospheric pressure

1

(Rp

/8)

ing pressure. Contacts 1 and 3 close when sub­ject to falling pressure.

NO

L1

3

COM

2

1

NC

1

2

NC

NO

COM

3

Positive
pressure

1 – –

DG..S

4 If the electrical contacts in the DG..S could be

soiled by dirt particles in the surrounding air or
in the medium, use a filter pad at port4.

Adjustment

▷

The switching point is adjustable via hand wheel.

1 Disconnect the system from the electrical power

supply.

2 Detach the housing cover, see page3 (Wir-

ing).

3 Connect an ohmmeter.

Connect Seal Free

Wiring

▷

If the DG..SG has switched a voltage >24V
and a current >0.1A once, the gold plating
on the contacts will have been burnt through. It

NO

NC

COM

2

3

1

NO

1

2

NC

3

COM

can then only be operated at this power rating
or higher power rating.

▷

Pressure switch DG can be used in Zone1
and2 hazardous areas if an isolating ampli-

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

fier is installed upstream in the safe area as

“Ex-i” equipment pursuant to EN 60079-11

0

(VDE0170-7):2007.
DG as “simple electrical equipment” pursuant to

▷

EN60079-11:2007 corresponds to the Tempera­ture classT6, GroupII. The internal inductance/
capacitance is Lo = 0.2μH/Co = 8 pF.

▷ 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.

CAUTION

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

– Note the switching capacity, see page4 (Tech-

nical data).

1 Disconnect the system from the electrical power

supply.

3 42

5 6 7

1 cm = 1 mbar

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

ing point on the ohmmeter and the pressure
gauge.

Switching dif-

ferential**

[mbar]

Type

Adjusting range*

[mbar]

DG 6 0.4 – 6 0.2 – 0.3
DG 10 1 – 10 0.25 – 0.4
DG 30 2.5 – 30 0.35 – 0.9
DG 50 2.5 – 50 0.8 – 1.5
DG 150 30 – 150 3 – 5
DG 400 50 – 400 5 – 15
DG 500 100 – 500 8 – 17

* Adjusting tolerance = ± 15% of the scale value.
** Mean switching differential at min. and max. setting.

▷

If the DG does not trip at the desired switch­ing point, correct the adjusting range using the
hand wheel. Relieve the pressure and repeat
the process.

ø 4,5–10 mm

M16 x 1,5:

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Tightness test

1 Shut off the downstream pipeline close to the

valve.

2 Open the valve and the medium supply.

▷ Check all used ports for tightness.

3 4

N2
900 mbar
max. 2 bar
< 15 min

Maintenance

In order to ensure smooth operation: check the tight­ness and function of the DG every year.

▷ After carrying out the maintenance work, check

for tightness, see page4 (Tightness test).

Max. medium temperature: -15to+80°C.
Storage and transport temperature: -40to+80°C.
RoHS compliant pursuant to 2002/95/EC.
Diaphragm pressure switch, silicone-free.
Diaphragm: IIR.
Housing: glass fibre reinforced PBT plastic with
low gas release.
Lower housing section: AlSi 12.
Enclosure: IP54 or IP65.
Safety class: 1.
Line entrance: M16 x 1.5, clamping range: diam­eters of 4 to 10mm.
Electrical connection type: screw terminals.
Weight: 270 g – 320 g.

Declaration of conformity

Technical data

Gas type: NH3, O2 and air.
Max. test pressure for testing the entire system:
temporarily <15minutes 2bar.
Switching capacity:
DG, U = 24 – 250 V AC:
I = 0.05 – 5 A at cos ϕ = 1,
I = 0.05 – 1 A at cos ϕ = 0.6.

DG..G, U = 5 – 250 V AC:
I = 0.01 – 5 A at cos ϕ = 1,
I = 0.01 – 1 A at cos ϕ = 0.6.

DG..G, U = 5 – 48 V DC:
I = 0.01 – 1 A.

Contact

Contact

We, the manufacturer, hereby declare that the prod­uct DG..S complies with the essential requirements
of the following Directive:

– 2006/95/EC

The production is subject to the Quality System pur-

suant to DIN EN ISO 9001:2008, TÜV NORD CERT.
Elster GmbH

Scan of the Declaration of conformity (D, GB) – see
www.docuthek.com

RoHS compliant

RoHS

2002/95/EC

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

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