Krom Schroder DG..S Series User manual

➔www.docuthek.comD GB F NL I E
© 2012 Elster GmbH · Edition 08.12
03251233 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 opera-
tor. 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 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.
Transport
On receipt of the product, check that the delivery is
complete (see Part designations). Report any trans-
port damage immediately.
Storage
Store the product in a dry place. Ambient tempera-
ture: see Technical data.
Contents
Operating instructions
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GB-1
03251233
Translation from the German
Pressure switches for gas DG..S
for NH3and O2
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
Contents

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Checking the usage
DG
To monitor rising and falling pressure.
Positive
pressure
Negative pres-
sure
Differential
pressure
DG..S NH3, O2,
air – –
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
SPositive pressure (NH3, O2)
GWith gold-plated contacts
-3
-4
-5
-6
-9
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
K2
T
T2
N
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
AExternal adjustment
Part designations
1
2
3
4
1Upper housing section with cover
2Lower housing section
3Hand wheel
4M16 cable gland
Type label
Max. inlet pressure, mains voltage, ambient tem-
perature, enclosure: see type label.
DG
2
13
D-49018 Osnabrück, Germany
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 NH3through the diaphragm also increases
which can cause corrosion of the contacts. For
this reason, query the closed contacts for opening.
– The medium NH3must not condense as this can
lead to increased corrosion of the lower section
(pressure supply can become blocked) and de-
formation 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pS
corresponds to the scale valueSK set on the
hand wheel. In other installation positions, the
switching pointpSwill change and no longer
correspond to the scale valueSK set on the
hand wheel. Check the switching point.
ps=SK
ps= SK + 0,18 mbar
ps= SK - 0,18 mbar
▷ 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.
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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1
4
1
Positive pressure
(Rp ¼)
4
Atmospheric pressure
(Rp 1
/8)
Connect Seal Free
Positive
pressure
DG..S
1– –
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.
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
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-
fier is installed upstream in the safe area as
“Ex-i” equipment pursuant to EN 60079-11
(VDE0170-7):2007.
▷
DG as “simple electrical equipment” pursuant to
EN60079-11:2007 corresponds to the Tempera-
ture 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.
M16 x 1,5:
ø 4,5–10 mm
3 42
5 6 7
M16 x 1,5:
ø 4,5–10 mm
3 42
5 6 7
▷ Contacts 3and 2close when subject to increas-
ing pressure. Contacts 1and 3close when sub-
ject to falling pressure.
NO
2
NC
1
COM
3
L1
COM
3
NC
1
NO
2
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.
NO
2
NC
1
COM
3
COM
3
NC
1
NO
2
0
1 cm = 1 mbar
4 Set the switching point using the hand wheel.
5 Connect a pressure gauge.
NO
2
NC
1
COM
3
COM
3
NC
1
NO
2
0
1 cm = 1 mbar
6 Apply pressure. In doing so, monitor the switch-
ing point on the ohmmeter and the pressure
gauge.
Type Adjusting range*
[mbar]
Switching dif-
ferential**
[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 switch-
ing point, correct the adjusting range using the
hand wheel. Relieve the pressure and repeat
the process.

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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.
Elster GmbH
Strotheweg 1, D-49504 Lotte (Büren)
Tel. [phone]
Fax [phone]
[email protected], www.kromschroeder.com
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.
N2
900 mbar
max. 2 bar
< 15 min
3 4
Maintenance
In order to ensure smooth operation: check the tight-
ness and function of the DG every year.
▷After carrying out the maintenance work, check
for tightness, see page4 (Tightness test).
Technical data
Gas type: NH3, O2and 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.
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: diam-
eters of 4 to 10mm.
Electrical connection type: screw terminals.
Weight: 270 g – 320 g.
Declaration of conformity
We, the manufacturer, hereby declare that the prod-
uct 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
Contact