Kromschroeder DG S Series User manual

CONTENTS
· Edition 02.24 · EN · 03251233
DE, EN, FR, NL, IT, ES – www.docuthek.com
Pressure switches for gas DG..S for NH3and O2
1 Safety ................................1
2 Checking the usage .....................2
3 Installation ............................2
4 Wiring................................3
5 Adjustment............................3
6 Tightness test..........................4
7 Maintenance...........................4
8 Accessories ...........................4
9 Technical data .........................6
10 Designed lifetime ......................6
11 Certification ..........................7
12 Logistics .............................7
13 Disposal .............................7
1 SAFETY
1.1 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.
1.2 Explanation of symbols
1, 2, 3, a, b, c = Action
➔= Instruction
1.3 Liability
We will not be held liable for damage resulting from
non-observance of the instructions and non-com-
pliant use.
1.4 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.
1.5 Conversion, spare parts
All technical changes are prohibited. Only use OEM
spare parts.
OPERATING INSTRUCTIONS

DG..S · Edition 02.24
EN-2
2 CHECKING THE USAGE
To monitor rising and falling pressure.
Positive pressure
Nega-
tive
pres-
sure
Differ-
ential
pres-
sure
DG..S NH3, O2, air – –
This function is only guaranteed when used within
the specified limits– see page 6 (9 Technical
data). Any other use is considered as non-compliant.
2.1 Type code
DG Pressure switch for gas
6
Adjusting range 40–600Pa (0,4–6mbar)
10 Adjusting range 100–1000Pa (1–10mbar)
50 Adjusting range 0,25–5 kPa (2,5–50mbar)
150 Adjusting range 3–15 kPa (30–150mbar)
500 Adjusting range 10–50 kPa (100–500mbar)
SPositive pressure for oxygen and ammo-
nia
GWith gold-plated contacts
-3 Electrical connection via screw terminals
-4 Electrical connection via screw terminals,
IP 65
-5 Electrical connection via 4-pin plug,
without socket, IP 54
-6 Electrical connection via 4-pin plug, with
socket, IP 54
-9 Electrical connection via 4-pin plug, with
socket, IP 65
K2 Red/green pilot LED for 24V DC/AC
TBlue pilot lamp for 230V AC
T2 Red/green pilot LED for 110 to 230V AC
NBlue pilot lamp for 120V AC
AExternal adjustment
2.2 Part designations
1
2
3
4
1 Upper housing section with cover
2 Lower housing section
3 Hand wheel
4 M16 cable gland
2.3 Type label
DG
CE 2
13
Made in Germany
Max. inlet pressure = withstand pressure, mains
voltage, ambient temperature, enclosure: see type
label.
3 INSTALLATION
CAUTION
Please observe the following to ensure that the
unit is not damaged during installation:
– Dropping the device can cause permanent
damage. In this event, replace the entire device
and associated modules before use.
– Use approved sealing material only.
– Check max. ambient temperature– see page
6 (9.1 Ambient conditions).
– 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 deformation of the diaphragm (causing the
switching point to shift).
– Continuous operation at high temperatures
accelerates the ageing of elastomer materials. In
places where a high thermal capacity is
required, thermal equipment trips must be
installed upstream of theDG.
– The service life will be shorter if subject to ozone
concentrations exceeding 200μg/m3.
– When installing outdoors, place the pressure
switch in a roofed area and protect from direct
sunlight (even IP65 version). To avoid conden-
sation, the cover with pressure equalization
element can be used. See accessories.
– Condensation or vapours containing silicone
must not be allowed to get into the housing. If
possible, install pipework with an ascending
gradient. Otherwise, there is a risk of icing of
condensation at subzero temperatures, the
switching point shifting or corrosion in the
device which can lead to malfunctions.
– Avoid strong impact on the unit.
➔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.
3.1 Installation position
Installation in the vertical or horizontal position, or
sometimes upside down, preferably with vertical
diaphragm. If installed in a vertical position, the
switching pointpSwill correspond to the scale
valueSK set on the hand wheel. If installed in
another position, the switching pointpSwill change
and no longer correspond to the set scale valueSK.
Switching pointpSmust be checked.

DG..S · Edition 02.24
EN-3
pS= SK
pS=
SK + 18Pa
(0.18mbar)
pS=
SK - 18Pa
(0.18mbar)
3.2 Connection options
1
4
1= Rp ¼
DG..S Connect Seal Free
Positive
pressure 1– –
➔If the electrical contacts in the pressure switch
could be soiled by dirt particles in the surround-
ing air or in the medium, use a filter pad (Order
No.74916199) at port 4. On IP65 units, the
filter pad is fitted as standard, see type label.
4 WIRING
Pressure switch DG..S can be used in Zone1(21)
and2(22) hazardous areas if an isolating amplifier is
installed upstream in the safe area as “Ex-i”appara-
tus pursuant to EN60079-11 (VDE0170-7):2012.
DG..S as “simple electrical apparatus” pursuant to
EN60079-11:2012 corresponds to the Temperature
classT6, GroupII. The internal inductance/capaci-
tance is Li= 0.2μH/Ci= 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.
NO
C = 1 µF
R = 22 Ω
2
NC
1
COM
3
➔If the pressure switch has switched a volt-
age >24V (>30V) and a current >0.1A at
cosφ=1 or >0.05A at cosφ=0.6 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.
CAUTION
– To ensure that the DG..S is not damaged during
operation, note the switching capacity, see
page 6 (9 Technical data).
1 Disconnect the system from the electrical power
supply.
2 3 4
5 M16 x 1,5:
ø 4–10 mm
6 Wire as shown on the connection diagram.
7 Tighten the M16 gland) (1/2" NPT conduit).
➔Contacts 3 and 2 close when subject to in-
creasing pressure. Contacts 1 and 3 close when
subject to falling pressure. With the NO contact,
the NC contact is omitted.
COM
3
NC
1
NO
2
NO
2NC
1
COM
3
L1
5 ADJUSTMENT
➔The switching point is adjustable via hand wheel.
1 Disconnect the system from the electrical power
supply.
2 Unscrew the housing cover.
➔Once the settings have been adjusted success-
fully, fit the housing cover again. Note the tight-
ening torques, see page 6 (9 Technical data).
3 Connect an ohmmeter.
COM
3
NC
1
NO
2
NO
2
NC
1
COM
3
4 Set the switching point using the hand wheel.
5 Connect a pressure gauge.
6
0
1 cm = 1 mbar
(0.4"= 0.4"WC)
7 Apply pressure. In doing so, monitor the
switching point on the ohmmeter and the
pressure gauge.
8 If the DG..S does not trip at the desired
switching point, correct the adjusting range
using the hand wheel. Relieve the pressure and
repeat the process.

DG..S · Edition 02.24
EN-4
5.1 Adjusting range
DG..S Adjusting range1) Switching
differential2)
DG6 40–600Pa
(0.4–6mbar)
10–25Pa
(0.1–0.25mbar)
DG10 100–1000Pa
(1–10mbar)
15–40Pa
(0.15–0.4mbar)
DG50 0.25–5 kPa
(2.5–50mbar)
0.05–0.12 kPa
(0.5–1.2mbar)
DG150
3–15 kPa
(30–150mbar)
0.22–0.55 kPa
(2.2–5.5mbar)
DG500
10–50 kPa
(100–500mbar)
0.8–1.5 kPa
(8–15mbar)
1) Adjusting tolerance = ±15% of the scale value.
2) Mean switching differential at min. and max. setting.
6 TIGHTNESS TEST
Check all gas ports used for tightness.
1 Shut off the downstream gas pipeline close to
the valve.
2 Open the valve and the gas supply.
➔N2= 900mbar, max. 2bar (13psi, max. 29psi)
<15min.
3 N
2
4
7 MAINTENANCE
In order to ensure smooth operation, check the
tightness and function of the pressure switch every
year.
➔After carrying out the maintenance work, check
for tightness, see page 4 (6 Tightness test).
8 ACCESSORIES
8.1 Filter pad set
To protect the electrical contacts in the DG..S 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
8.2 External adjustment
In order to set the switching pressure from the out-
side, the cover for external adjustment (6mm Allen
key) for DG..S can be retrofitted.
Order No.: 74916155
1 2 3
8.3 Weather protection cover
B
A
C
D
G
E
F
When the DG is installed outdoors, the weather pro-
tection cover provides permanent protection against
condensation and weathering of housing parts.
The weather protection cover is made of 1mm-thick
stainless steel.
The enclosed filter pad is designed to protect the
open 1/8" port from the ingress of dirt or insects.
Scope of delivery:
A1 x covers, 100 x 100 x 100mm
B2 x M4 x 16 screws
C4 x nuts
D2 x washers
E2 x cap nuts
F1 x filter pad (1/8" port)
G1 x grip plug
Order No.: 74924909
Installation position: vertical, with the cable gland
pointing downwards.

DG..S · Edition 02.24
EN-5
8.4
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
8.5 Pressure equalization element
For CE certified pressure switches.
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
8.6 Restrictor orifice
R
¼
Rp
¼
For CE certified pressure switches.
In the case of high pressure fluctuations, we recom-
mend using a restrictor orifice (contains non-ferrous
metals).
Hole diameter 0.2mm, Order No.: 75456321
Hole diameter 0.3mm, Order No.: 75441317
8.7 Tube set
To be used with air only.
Tube set with 2m PVC tube (Ø4,75x 1mm), 2duct
connection flanges with screws, R1/4 and R1/8
connecting nipples.
Order No.: 74912952.
8.8 Standard coupler plug
Order No.: 74920412
8.9 Standard coupler plug set
For CE certified pressure switches, Order No.:
74915388
1
3
2
L1
N
N
NO
NO
1 2
COM
L1
3
8.10 Pilot lamp, red/blue
Pilot lamp, red
110/120V AC, I = 1.2mA, Order No.: 74920430.
230V AC, I = 0.6mA, Order No.: 74920429.
Pilot lamp, blue
110/120V AC, I = 1.2mA, Order No.: 74916121.
230V AC, I = 0.6mA, Order No.: 74916122.

DG..S · Edition 02.24
EN-6
1 2 3
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
2NC
1
COM
3
L1
N
8.11 Red/green LED for 24VDC/AC or
110–230VAC
24V DC, I = 16mA; 24V AC, I = 8mA, Order No.:
74921089.
110 to 230V AC, Order No.: 74923275.
1 2 3
4
NC
1
COM
3
NO
2
N
NO
21 NC
3 COM
+
–
9 TECHNICAL DATA
9.1 Ambient conditions
Max. medium and ambient temperatures:
-15 to +80°C (5 to 176°F),
-20 to +80°C (-4 to +176°F).
Storage and transport temperatures: -20 to +40°C
(-4 to +104°F).
Icing, condensation and dew in and on the unit are
not permitted.
Enclosure: IP54 or IP65. Safety class: 1.
This unit is not suitable for cleaning with a high-pres-
sure cleaner and/or cleaning products.
9.2 Mechanical data
Gas type: NH3, O2and air.
Max. inlet pressure pmax. = withstand pressure:
600mbar.
Max. test pressure for testing the entire system:
temporarily (<15minutes) 2bar.
Diaphragm pressure switch, silicone-free.
Diaphragm: IIR.
Housing: glass fibre reinforced PBT plastic with low
gas release.
Lower housing section: AlSi 12.
Weight: 270to320g.
9.3 Electrical data
Switching capacity:
UI
(cosφ=1)
I
(cosφ=0.6)
DG 24–
250VAC 0.05–5A 0.05–1A
DG..G 5–250V AC 0.01–5A 0.01–1A
DG..G 5–48V DC 0.01–1A 0.01–1A
Conductor diameter: 0.5 to 1.8mm (AWG24 to
AWG13).
Line entrance: M16x1.5, clamping range: 4 to
10mm.
Type of connection: screw terminals.
10 DESIGNED LIFETIME
This information on the designed lifetime is based
on using the product in accordance with these
operating instructions. Once the designed lifetime
has been reached, safety-relevant products must be
replaced.
Designed lifetime (based on date of manufacture):
10 years.
You can find further explanations in the applicable
rules and regulations and on the afecor website
(www.afecor.org).
This procedure applies to heating systems. For ther-
moprocessing equipment, observe local regulations.

DG..S · Edition 02.24
EN-7
11 CERTIFICATION
11.1 Certificate download
Certificates – see www.docuthek.com
11.2 Declaration of conformity
We, the manufacturer, hereby declare that the
products DG..S comply with the requirements of the
listed Directives and Standards.
Directives:
– 2014/35/EU
– 2014/30/EU
– 2011/65/EU – RoHS II
– 2015/863/EU – RoHS III
Standards:
Based on
– EN1854:2010
Elster GmbH
11.3 Eurasian Customs Union
The products DG..S meet the technical specifica-
tions of the Eurasian Customs Union.
11.4 REACH Regulation
The device contains substances of very high con-
cern which are listed in the Candidate List of the
European REACH Regulation No.1907/2006. See
Reach list HTS atwww.docuthek.com.
11.5 China RoHS
Directive on the restriction of the use of hazardous
substances (RoHS) in China. Scan of the Disclo-
sure Table China RoHS2, see certificates at www.
docuthek.com.
12 LOGISTICS
Transport
Protect the unit from external forces (blows, shocks,
vibration).
Transport temperature: see page 6 (9 Technical
data).
Transport is subject to the ambient conditions
described.
Report any transport damage on the unit or packag-
ing without delay.
Check that the delivery is complete.
Storage
Storage temperature: see page 6 (9 Technical data).
Storage is subject to the ambient conditions
described.
Storage time: 6months in the original packaging
before using for the first time. If stored for longer
than this, the overall service life will be reduced by
the corresponding amount of extra storage time.
13 DISPOSAL
Devices with electronic components:
WEEE Directive 2012/19/EU – Waste Electrical
and Electronic Equipment Directive
At the end of the product life (number of operat-
ing cycles reached), dispose of the packaging and
product in a corresponding recycling centre. Do not
dispose of the unit with the usual domestic refuse.
Do not burn the product.
On request, old units may be returned carriage paid
to the manufacturer in accordance with the relevant
waste legislation requirements.

DG..S · Edition 02.24
EN-8
© 2024 Elster GmbH We reserve the right to make technical modifications in the interests of progress.
The Honeywell Thermal Solutions family of products includes
Honeywell Combustion Safety, Eclipse, Exothermics, Hauck,
Kromschröder and Maxon. To learn more about our products, visit
ThermalSolutions.honeywell.com or contact your Honeywell Sales
Engineer.
Elster GmbH
Strotheweg 1, D-49504 Lotte
T [phone]
[email protected]
www.kromschroeder.com
Global centralized service deployment coordination:
T [phone] or -555
[email protected]
Translation from the German
FOR MORE INFORMATION