Krom Schroder DG**H series User manual

DK S N P GR
➔www.docuthek.com
D GB F NL I E
TR CZ PL RUS H
© 2012 Elster GmbH
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
• ,  ,  ,  ... = 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
Translation from the German
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GB-1
057 · Edition 08.
Pressure switches for gas
DG..H, DG..N
Pressure switch for gas DG..I
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
Contents

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Checking the usage
DG..H, DG..N, DG..I
For monitoring increasing and decreasing gas or
air pressure.
-6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6
Increasing
negative pressure
Decreasing
negative pressure
Increasing pressure
Decreasing pressure
Positive
pressure
Negative
pressure
Differential
pressure
DG..H,
DG..N
Gas, air, flue
gas Air, flue gas Air, flue gas
DG..I 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
GWith gold-plated contacts
-
-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
K
T
T
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
5
4
Upper housing section with cover
Lower housing section
Hand wheel
4M16 cable gland
5DG..H, DG..N with manual reset
Type label
DG

CE – 0085AP0467
2
13
D-49018 Osnabrück, Germany
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pSwill change and no longer
correspond to the scale valueSK set on the
hand wheel. Check the switching point.

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DG..H, DG..N
pS= SK pS= SK + 0.18 mbar pS= SK - 0.18 mbar
DG 18I
pS= SK pS= SK - 0.5 mbar
DG 120I, DG 450I
pS= SK pS= SK - 0.2 mbar
DG 1,5I
pS= SK
Negative pressure:
pS= SK - 0.4 mbar
Positive pressure:
pS= SK + 0.4 mbar
DG 12I
pS= SK
Negative pressure:
pS= SK - 0.5 mbar
Positive pressure:
pS= SK + 0.5 mbar
Connection facilities
2
1
3
4
1 and 2
Gas, air, flue gas
3 and 4
Air, flue gas
▷ Portsand 4are suitable for air and flue gas only.
▷ If the electrical contacts in the DG could be soiled
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.
1
2
pmax =
600 mbar
Rp 1/4
1
2
pmax =
Rp 1/4
2pmax =
600 mbar
Rp 1/4
0
Positive pressure measurement at port
5 Seal port.
1
2
pmax =
600 mbar
Rp 1/4
1
2
pmax =
Rp 1/4
2pmax =
600 mbar
Rp 1/4
0
Negative pressure measurement at port4
5 Seal port.
3
Rp 1/8 4
pmax =
-600 mbar
3
4
Rp 1/8
pmax =
-600 mbar
3
0
Negative pressure measurement at port
5 Seal port4.
3
Rp 1/8 4
pmax =
-600 mbar
3
4
Rp 1/8
pmax =
-600 mbar
3
0
Differential pressure measurement
▷Use port or for the higher absolute pressure
and port or 4for the lower absolute pressure.
5 Seal the remaining ports.
∆pmax =
600 mbar 1
3
∆pmax =
600 mbar 3
1

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Installing DG..I
▷ It is recommended that the port which is best
protected from dirt and water be left open.
Negative pressure measurement at port
5 Seal port.
1
2
pmax =
-600 mbar
Rp 1/4
1
2
pmax =
Rp 1/4
2pmax =
-600 mbar
Rp 1/4
0
–
–
Negative pressure measurement at port
5 Seal port.
1
2
pmax =
-600 mbar
Rp 1/4
1
2
pmax =
Rp 1/4
2pmax =
-600 mbar
Rp 1/4
0
–
–
Wiring
▷If the DG..G 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 amplifier 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.
CAUTION
To ensure that the DG is not damaged during opera-
tion, note the switching capacity, see page 7
(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.
NO
C = 1 µF R = 22 Ω
2
NC
1
COM
3
 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 and close when subject to increas-
ing pressure. Contacts and close when sub-
ject to falling pressure.
COM
3
NC
1
NO
2
NO
2
NC
1
COM
3
L1
DG ,5I and DG I
▷The connection of DG 1,5l and DG 12l depends
on the positive or negative adjusting range.
DG 12I DG 1,5I
-
1
2
-
1
1
-
1
0
-
9
-
8
-
7
-
6
-
5
- 4
-
3
-
2
-
1
1
2
3
4
5
6
7
1
0
0
P
a
=
1
m
b
a
r
p
s
=
-
1
2
–
-
1
;
1
–
7
m
b
a
r
-
1
,
5
-
1
-
0
,
5
0
,
5
1
1
,
5
2
2
,
5
3
p
s
=
-
1
,
5
–
-
0
,
5
;
0
,
5
–
3
m
b
a
r
1
0
0
P
a
=
1
m
b
a
r
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
▷ In the negative adjusting range, the template
which can be found in the unit displays the con-
nection diagram.
NC 1
COM
COM
N
3
3
NO
2
NC
1
NO
µ
2
▷In the positive adjusting range, remove the tem-
plate and wire the unit as shown in the engraved
connection diagram.
NO
2
NC
1
COM
3

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Adjustment
▷ The switching point is adjustable via hand wheel.
 Disconnect the system from the electrical power
supply.
 Detach the housing cover, see page7 (Tech-
nical data).
 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]
Reset pressure**
[mbar]
DG 10H, ..N 1 – 10 0.4 – 1
DG 50H, ..N 2.5 – 50 1 – 2
DG 150H, ..N 30 – 150 2 – 5
DG 500H, ..N 100 – 500 4 – 17
Type Adjusting range*
[mbar]
Switching
differential***
[mbar]
DG 1,5I -1.5 to -0.5 and
+0.5 to +3 0.2 – 0.5
DG 12I -12 to -1 and
+1 to +7 0.5 – 1
DG 18I -2 to -18 0.5 – 1.5
DG 120I -10 to -120 4 – 11
DG 450I -80 to -450 10 – 30
* Adjusting tolerance = ± 15% of the scale value.
** Difference between switching pressure and pos-
sible reset.
*** Mean switching differential at min. and max. setting.
▷ Deviation from the switching point during testing
pursuant to EN1854:
Gas pressure switches: ± 15%.
Air pressure switches:
Deviation
DG..H, ..N, ..I ± 15%
DG 1,5I ± 15% or ± 0.4 mbar
DG 12I ± 15% or ± 0.5 mbar
DG 18I ± 15% or ± 0.5 mbar
▷
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.
Tightness test
 Shut off the downstream gas pipeline close to
the valve.
 Open the valve and the gas 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, or every
six months if operated with biologically produced
methane.
▷A function check can be carried out in case of
decreasing pressure control e.g. with the PIA.
▷After carrying out the maintenance work, check
for tightness, see page5 (Tightness test).
Accessories
Connecting set
For monitoring a minimum and maximum inlet pres-
sure puwith two pressure switches attached to one
another.
Order No.: 74912250
1
2
3
2
2
1
1
4
1
Remove from
both pressure
switches.
Install on one
pressure
switch.
Filter pad set
To protect the electrical contacts in the DG from dirt
particles in the surrounding air or in the medium, use
a filter pad at the 1/8" negative pressure port. As
standard on IP 65 units.
5-piece filter pad set, Order No.: 74916199

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External adjustment
In order to set the switching pressure from the outside,
the cover for external adjustment (6mm Allen key)
for DG..I can be retrofitted.
Order No.: 74916155
2 31
4
Pressure equalization element
To avoid the formation of condensation, the cover
with pressure equalization element can be used. The
diaphragm in the screw connector is designed to
ventilate the cover, without allowing water to enter.
Order No.: 74923391
Restrictor orifice
In the case of high pressure fluctuations, we recom-
mend using a restrictor orifice (contains non-ferrous
metals).
R
¼
Rp
¼
Hole diameter 0.2 mm, Order No.: 75456321,
hole diameter 0.3 mm, Order No.: 75441317.
Test key PIA
To test the min. pressure switch, the DG can be
vented in its switched state using the PIA test key
(contains non-ferrous metals).
Click
TEST
R
¼
Rp
¼
Order No.: 74329466
Fastening set with screws, U-shape bracket
M4 x 10
M4 x 12
50 (1.97")
47,5 (1.87")
75 (2.95")
30 (1.18")
20
(0.79")
25 (0.98")
45 (1.77")
20
(0.79")
24 (0.94")
43 -0,3 (1.69")
64 (2.52")
40 (1.57")
6 (0.24")
16
(0.63")
39 (1.53")
4,20 +0,1
(0.17")
5,2
(0.2") 10
(0.4")
Order No.: 74915387
Tube set
To be used with air only.
Order No.: 74912952
Standard socket set
1
3
2
L1
N
N
NO
NO
12
COM
L1
3333333
3
Order No.: 74915388

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Standard coupler plug
Order No.: 74920412
Pilot lamp set, red or blue
Pilot lamp, red:
110/120 V AC, I = 1.2 mA, Order No.: 74920430;
220/250 V AC, I = 0.6 mA, Order No.: 74920429.
Pilot lamp, blue:
110/120 V AC, I = 1.2 mA, Order No.: 74916121;
220/250 V AC, I = 0.6 mA, Order No.: 74916122.
2 31
4
NC
1
COM
3
NO
NO 2
N
NO
2
NC
1
COM
3
L1
N
NC
1
COM
3
NO
NC
2
N
NO
2
NC
1
COM
3
L1
N
LED set, red/green
24 V DC, I = 16 mA; 24 V AC, I = 8 mA,
Order No.: 74921089;
230 V AC, I = 0.6 mA, Order No.: 74923275.
2 31
4
NC
1
COM
3
NO
2
N
NO
21 NC
3 COM
+
–
Technical data
Gas type: natural gas, town gas, LPG (gaseous),
flue gas, biologically produced methane (max.
0.1%-by-vol. H2S) and air.
Max. test pressure for testing the entire system:
temporarily <15minutes 2mbar.
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.
U = 5 – 48 VDC,
I = 0.01 – 1 A.
Maximum medium temperature:
DG..H, DG..N: -15 to +60°C,
DG..I: -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: NBR.
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.
Type of connection: screw terminals.
Weight: 270 to 320g depending on equipment.

Elster GmbH
Postfach 28 09, D-49018 Osnabrück
Strotheweg 1, D-49504 Lotte (Büren)
T [phone]
F [phone]
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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. [e-mail], www.kromschroeder.com
Contact
Designed lifetime
The Pressure Equipment Directive (PED) and the
Energy Performance of Buildings Directive (EPBD)
demand regular checks on and maintenance of heat-
ing systems in order to ensure a high level of use
in the long term, a clean method of operation and
safe function.
The service life on which the construction is based,
hereinafter referred to simply as the “designed
lifetime”, is compiled from the relevant standards.
You can find further explanations in the applicable
rules and regulations and on the afecor website
(www.afecor.org).
This information on the designed lifetime is based on
using the product in accordance with these operat-
ing instructions.
The product must be serviced at regular intervals.
Once the specified designed lifetime has been
reached, the safety-related functions must be
checked in accordance with the section entitled
“Maintenance”.
If the product passes the aforementioned function
tests, you can continue to use it until the next sched-
uled maintenance operation. At this point, these tests
must be repeated.
If the product fails one of the aforementioned tests,
it must be replaced immediately.
This procedure applies to heating systems. For
thermoprocessing equipment, observe national
regulations.
Designed lifetime (based on date of manufacture) in
accordance with EN13611, EN1854 for pressure
switches:
Medium Designed lifetime
Switching cycles Time [years]
Gas 50,000 10
Air 250,000 10
Long-term use in the upper ambient temperature
range accelerates the ageing of the elastomer ma-
terials and reduces the service life (please contact
manufacturer).
Declaration of conformity
We, the manufacturer, hereby declare that the product
DG, marked with product ID No. CE-0085AP0467,
complies with the requirements of the listed Direc-
tives and Standards.
Directives:
– 2009/142/EC
– 2006/95/EC
Standards:
– EN 13611
– EN 1854
The relevant product corresponds to the type tested
by the notified body 0085.
The production is subject to the surveillance proce-
dure pursuant to annex II, paragraph 3 of Directive
2009/142/EC and to the Quality System pursuant to
DIN EN ISO 9001:2008.
Elster GmbH
Scan of the Declaration of conformity (D, GB) – see
www.docuthek.com
SIL, PL
Suitable for Safety Integrity Level SIL1 and2, in the
case of 2DG also for SIL3, and Performance Level
PLa, b, c, d,e, depending on the demand ratenop
(mean number of annual operations).
B10d value (mean number of cycles until 10% of the
components fail dangerously)= operating cycles.
U I B10d value
24 V DC 10 mA 6,689,477
230 V AC 4 mA
24 V DC 70 mA 3,887,652
230 V AC 20 mA
230 V AC 2 A 974,800
RoHS compliant
RoHS
2002/95/EC