DWR
Pressure monitors
Especially suitable as a pressure monitor
or pressure limiter for fuel gases (DVGW
Worksheet G 260) and liquid fuels (e.g. fuel oil),
as well as for steam systems according to TRD
604 and hot-water systems to DIN EN12828,
systems in accordance to DIN EN12952-11
SIL 2 according IEC 61508-2
DWR625
Technical data
Pressure connection
External thread G 1/2 (pressure gauge
connection) to DIN 16 288 and internal thread
G 1/4 to ISO 228 Part 1 (for gas applications
internal thread permissible only up to 4 bar).
Switching device
Rugged housing (200) made of seawater-
resistant diecast aluminium.
Materials
Pressure bellows: Material no. 1.4571
Sensor housing: Material no. 1.4104 Switch
housing: GD AI Si 12 (DIN 1725)
Mounting position
Vertically upright and horizontal.
Ambient temperature at switching device
–25 to +70°C,
Medium temperature –25 to +70°C. The
maximum medium temperature at the pressure
sensor must not exceed the permitted ambient
temperature at the switching device.
Temperatures may reach 85°C for short periods.
Higher medium temperatures are possible
provided the above limit values for the switching
device are ensured by suitable measures
(e.g. siphon).
Mounting
Directly on the pressure line (pressure gauge
connection) or on a flat surface with two 4 mm
Ø screws.
Calibration
The DWR series is calibrated for rising pressure.
This means that the adjustable switching pressure
on the scale corresponds to the switching point at
rising pressure. The reset point is lower by the
amount of the switching differential. (See also
page 27, 2. Calibration at upper switching point).
In version ...-203 the switching differential is
adjustable. The basic calibration is maintained.
Bursting pressure
For all types
≥
100 bar, verified by TÜV test.
Switching differential
For values see Product
Summary.
Contact arrangement
Single pole changeover
switch.
Switching
capacity
Normal
250 VAC 250 VDC 24 VDC
(ohm) (ind) (ohm) (ohm)
8A 5A
0.3 A
8A
Component tested for
Function
Direction of action
Sensor
Steam
Systems according to TRBS
Hot water
Systems according to DIN EN12828
Fuel gases
DVGW Worksheet G 260
Pressure tank
DIN EN764-7
Pressure monitor or pressure limiter
(with external interlock)
For maximum and minimum pressure monitoring
(DWFS, SDBFS)
"of special construction"
by testing with 2 million cycles.
Product Summary
Type
Setting range
Switching
differential
(mean values)
Maximum
working
pressure
Dimen-
sioned
drawing
p. 25 + 26
1 + 15
1 + 18
63 bar
1 + 16
63 bar
1 + 16
Protection class
IP 54 according to
DIN 40 050
-DWR
see page 69
s
tested
DVGW
TÜV
Protection Class:
IP 54
Accessories
Solenoid valves
Switching differential adjustable
DWR06–203
0.1…0.6 bar
0.08…0.5
DWR1–203
0.2…1.6 bar
0.15…0.6
DWR3–203
0.2…2.5 bar
0.17…1.2
DWR6–203
0.5…6 bar
0.3…1.4
DWR625–203
0.5…6 bar
0.4…2.5
DWR16–203
3…16 bar
0.75…3.15
DWR25–203
4…25 bar
1.3…6.0
DWR40–203
8…40 bar
2.3…6.6
bar
bar
bar
bar
bar
bar
bar
bar
6 bar
16 bar
25 bar
1 + 15
1 + 18
1 + 17
Flow monitors
Pressure monitors without differential adjustment
DWR06
0.1…0.6 bar
0.04 bar
DWR1
0.2…1.6 bar
0.06 bar
DWR3
0.2…2.5 bar
0.1 bar
DWR6
0.5…6 bar
0.2 bar
DWR625
0.5…6 bar
0.25 bar
DWR16
3…16 bar
0.5 bar
DWR25
4…25 bar
1.0 bar
DWR40
8…40 bar
1.3 bar
6 bar
16 bar
25 bar
1 + 17
Temperature sensors
Thermostats
Pressure transmitters
and DIN EN12953-9. The DWR is used to
monitor maximum and minimum pressures.
This pressure switch is "of special construction"
and has been tested with 2 million operating
cycles. TÜV and DVGW tests exists.
Pressure switches
Mechanical pressure switches
Tested to PE Directive 97/23/EC
59
Safety-engineered maximum
pressure monitors
Technical data
Pressure connection
External thread G 1/2 (pressure gauge
connection) according to DIN 16 288 and
interval thread G 1/4 to ISO 228 Part 1.
Switch housing 500
Diecast aluminium GD AI Si 12.
Aluminium housing coated with
resistant plastic.
Mounting position
Vertically upright.
Protection class
IP 65.
Ex protective category
Ex-i (only when used in conjunction with
suitable isolating amplifier).
Component testing
See table on page 52.
Pressure sensor materials
Housing: 1.4104
Pressure bellows: 1.4571
All parts fully welded.
Ambient temperature
DWAM: –20°C to +60°C, DWR: –25°C to
+60°C. At ambient temperatures at or below
0°C, ensure that condensation cannot occur in
the sensor or in the switching device.
Max. temperature of medium at sensor
+ 60°C.
Outdoor installations
Protect the device against direct atmospheric
influences. Provide a protective cover.
Max. working pressure
See Product Summary
Switching pressure setting
Adjustable with the setting spindle after
removing the terminal box.
Mounting
With suitable weld-on connections and union
nuts or with pressure gaugescrew union G 1/2.
Power supply circuit
Ui 14 V DC
Ri 1500 Ohm
Ci 1 nF
Li 100 µH
Connection diagrams
Sensor "of special construction", self-monitoring via safety diaphragm, type-tested according to
VdTÜV Memorandum "Pressure 100".
SIL2 according IEC 61508-2
Type
Setting range
Switching
differential
(mean values)
Max.
Dimen-
permissible sioned
pressure
drawing
page 25 + 26
DWAM06-576
DWAM1-576
DWAM2,5-576
DWAM6-576
DWAM625-576
DWAM16-576
DWAM32-576
0.1…0.6
0.2…1.6
0.4…2.5
1.2…6
1.2…6
3…16
6…32
bar
bar
bar
bar
bar
bar
bar
0.04
0.05
0.07
0.2
0.25
0.4
1.2
bar
bar
bar
bar
bar
bar
bar
5
5
5
10
20
20
45
bar
bar
bar
bar
bar
bar
bar
2+
15
2+
19
Versions:
ZF 577: Maximum pressure limiter (with internal interlock)
Microswitch not positive opening, contacts: silver alloy other equimpent like DWAM…576.
Max. pressure limiter DWAM1-577 (isn´t in article master data). Please use DWAM2,5-577.
Sensor "of special construction" made from stainless steel. (Component testing with 2 million
operating cycles). Component tests: VdTÜV Memorandum "Pressure 100", DIN EN1854 (fuel gases),
DIN EN764-7, systems in accordance to DIN EN12952-11 and DIN EN12953-9.
SIL 2 according ICE 61508-2
Type
Setting range
Switching
differential
(mean values)
Max.
permissible
pressure
Dimen-
sioned
drawing
page 25 + 26
2+
15
2+
18
2+
17
2+
16
Versions:
ZF 577: Maximum pressure limiter (with internal interlock)
Microswitch not positive opening, contacts: silver alloy other equimpent like DWR… 576
…576
Calibration
Devices of the
DWR-576
and
DWAM-576
series are calibrated for rising pressure. This means that
the adjustable switching pressure on the scale corresponds to the switching point at rising pressure.
The reset point is lower by the amount of the switching differential. (See also page 27, 2. Calibration
at upper switching point).
…577
s
tested
DVGW
TÜV
Protection Class:
IP 65
Accessories
Solenoid valves
Flow monitors
DWR06-576
DWR1-576
DWR3-576
DWR6-576
DWR625-576
DWR16-576
DWR25-576
DWR40-576
0,1…0,6
0,2…1,6
0,2…2,5
0,5…6
0,5…6
3…16
4…25
10…40
bar
bar
bar
bar
bar
bar
bar
bar
0,04
0,06
0,1
0,2
0,25
0,5
1,0
1,3
bar
bar
bar
bar
bar
bar
bar
bar
6
6
16
16
25
25
63
63
bar
bar
bar
bar
bar
bar
bar
bar
Temperature sensors
Maximum pressure monitors
Thermostats
Pressure transmitters
Maximum pressure monitors
Pressure switches
Mechanical pressure switches
Tested to PE Directive 97/23/EC
55
56
Mechanical pressure switches
Tested to PE Directive 97/23/EC
Safety-engineered minimum pressure monitors
Sensor "of special construction made from stainless steel. (self-monitoring and component testing
with 2 million operating cycles). Component tests: VdTÜV Memorandum "Pressure 100", DIN EN3398
(fuel gases) DIN EN764-7, systems in accordance to DIN EN12952-11 and DIN EN12953-9
SIL2 according IEC 61508-2
Technical data
Switching element
See table opposite.
Connecting diagrams
Type
Setting range
Switching
differential
(mean values)
0.04
0.06
0.1
0.2
0.25
0.5
1.0
1.3
bar
bar
bar
bar
bar
bar
bar
bar
Max.
permissible
pressure
6
6
16
16
25
25
63
63
bar
bar
bar
bar
bar
bar
bar
bar
…574
…575
DWR06-574
DWR1-574
DWR3-574
DWR6-574
DWR625-574
DWR16-574
DWR25-574
DWR40-574
0.1…0.6
0.2…1.6
0.2…2.5
0.5…6
0.5…6
3…16
4…25
8…40
bar
bar
bar
bar
bar
bar
bar
bar
Dimen-
sioned
drawing
page 25 + 26
2+
15
2+
18
2+
17
2+
16
The other technical data correspond to the
devices for maximum pressure monitoring
(page 51).
For the power supply circuit:
Ui 14 V DC
Ri 1500 Ohm
Ci 1 nF
Li 100 µH
Calibration
The
DWR-574
series is calibrated for falling pressure. This means that the adjustable switching pressure
on the scale corresponds to the switching point at falling pressure. The reset point is higher by the
amount of the switching differential. (See also page 27, 1. Calibration at lower switching point).
Versions:
ZF 575: Minimum pressure limiters (with internal interlock)
Switching contacts: silver alloy
other equipment like DWR… 574
Features of safety-engineered pressure monitors and pressure limiters
Devices
Component
testing
1 = VdTÜV Memorandum "Pressure 100"
Features
Options
Resistor combination for line break and
4 = DIN EN12952-11/DIN EN12953-9
Ex-ia-version for intrinsically safe
Limiter with internal interlock
short-circuit monitoring
Plastic-coated housing
3 = DIN EN764-7
Chemical version
Positive opening
microswitches
Gold-plated
contacts
n
n
n
n
n
n
n
n
n
n
n
n
n
Maximum pressure monitoring
FD16-326
FD16-327
DWAM…576
DWAM…577
DWR…576
1+
DWR…577
1+
1
1
1
1
2
2
+
+
+
+
+
+
3
3
4
4
3+4
3+4
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
Minimum pressure monitoring
DWR…574
1+2+3+4
DWR…575
1+2+3+4
n
n
n
n
s
tested
DVGW
TÜV
Protection Class:
IP 65
Chemical version
n
n
n
n
2 = DIN EN1854
pressure sensor
Self-monitoring
control circuits
Mechanical pressure switches
Technical features / Advantages
Diecast aluminium housing
IP 54 or IP 65
version also available
Wall mounting
or directly on the pressure line
Switching element (microswitch)
Lead sealable setpoint adjustment
Setting spindle locking element
Stainless steel sensor housing
Stainless steel bellows
with internal stop
Pressure connection
G 1/2" external
G 1/4" internal
Centring pin
Accessories
Solenoid valves
Flow monitors
Terminal connection
or plug connection to
DIN EN175301 Form A
Temperature sensors
Thermostats
Pressure transmitters
Pressure switches
Mechanical pressure switches
Technical features/Advantages
19
20
Mechanical pressure switches
Definitions
Definitions
Pressure data
Overpressure
Pressure
over
the relevant atmospheric pressure. The reference point is
atmospheric pressure.
Pressure
under
the relevant atmospheric pressure. The reference point is
atmospheric pressure.
Overpressure relative to absolute vacuum.
Vacuum
Absolute pressure
Differential pressure
Difference in pressure between 2 pressure measuring points.
Relative pressure
Overpressure or vacuum relative to atmospheric pressure.
Pressure data in all FEMA documents refers to relative pressure.
That is to say, it concerns pressure differentials relative to atmospheric pressure.
Overpressures have a positive sign, vacuums a negative sign.
Permissible working pressure
(maximum permissible pressure)
The maximum working pressure is defined as the upper limit at which the operation, switching reliability
and water tightness are in no way impaired (for values see Product summary).
Bursting pressure (test pressure)
Type-tested products undergo a pressure test certified by TÜV affirming that the bursting pressure
reaches at least the values mentioned in the Product summary. During the pressure tests the measuring
bellows are permanently deformed, but the pressurized parts do not leak or burst. The bursting pressure
is usually a multiple of the permissible working pressure.
Setting range
Pressure range in which the cutoff pressure can be set with the setting spindle.
Pressure units
Unit
bar
mbar
Pa
kPa
MPa
(psi) Ib/m
2
1
1
1
1
1
bar
mbar
Pa
kPa
MPa
1
0.001
10
-5
0,01
10
1000
1
0.01
10
10
4
10
5
100
1
1000
10
6
100
0.1
0.001
1
1000
0.1
10
-4
10
-6
0.001
1
14.5
0.0145
1.45 · 10
-4
0,145
145
In FEMA documents pressures are stated in
bar
or
mbar.
Pressure data for a pressure
switchbased on the example
of DWR625:
Setting range: 0.5-6 bar
Perm. working pressure: 20 bar
Bursting pressure: >100 bar
Important:
All pressure data refers to overpressures or vacuums relative to atmospheric pressure.
Overpressures have a positive sign, vacuums a negative sign.
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