Mechanical pressure switches
59
Tested to PE Directive 97/23/EC
DWR
Pressure monitors
Especially suitable as a pressure monitor and DIN EN12953-9. The DWR is used to
or pressure limiter for fuel gases (DVGW monitor maximum and minimum pressures.
Worksheet G 260) and liquid fuels (e.g. fuel oil), This pressure switch isof special constructio
as well as for steam systems according to TRD and has been tested with 2 million operating
604 and hot-water systems to DIN EN12828, cycles. TV and DVGW tests exists.
systems in accordance to DIN EN12952-11
SIL 2 according IEC 61508-2
DWR625
Technical data Component tested for Steam Systems according to TRBS
Hot water Systems according to DIN EN12828
Pressure connection
Fuel gases DVGW Worksheet G 260
External thread G 1/2 (pressure gauge
connection) to DIN 16 288 and internal thread
Pressure tank DIN EN764-7
G 1/4 to ISO 228 Part 1 (for gas applications
Function Pressure monitor or pressure limiter
internal thread permissible only up to 4 bar).
(with external interlock)
Switching device
Direction of action For maximum and minimum pressure monitoring
Rugged housing (200) made of seawater-
(DWFS, SDBFS)
resistant diecast aluminium.
Sensorof special constructio by testing with 2 million cycles.
Materials
Pressure bellows: Material no. 1.4571
Sensor housing: Material no. 1.4104 Switch
housing: GD AI Si 12 (DIN 1725)
Mounting position
Product Summary
Vertically upright and horizontal.
Ambient temperature at switching device
Type Setting range Switching Maximum Dimen-
25 to +70C,
differential working sioned
Medium temperature 25 to +70C. The
maximum medium temperature at the pressure (mean values) pressure drawing
sensor must not exceed the permitted ambient
temperature at the switching device.
Pressure monitors without differential adjustment p. 25 + 26
Temperatures may reach 85C for short periods.
Higher medium temperatures are possible
DWR06 0.10.6 bar 0.04 bar 6 bar 1 + 15
provided the above limit values for the switching
DWR1 0.21.6 bar 0.06 bar
device are ensured by suitable measures
DWR3 0.22.5 bar 0.1 bar 16 bar 1 + 18
(e.g. siphon).
DWR6 0.56 bar 0.2 bar
Mounting
DWR625 0.56 bar 0.25 bar 25 bar 1 + 17
Directly on the pressure line (pressure gauge
connection) or on a flat surface with two 4 mm
DWR16 316 bar 0.5 bar
screws.
DWR25 425 bar 1.0 bar 63 bar 1 + 16
Calibration
DWR40 840 bar 1.3 bar
The DWR series is calibrated for rising pressure.
This means that the adjustable switching pressure
on the scale corresponds to the switching point at Switching differential adjustable
rising pressure. The reset point is lower by the
DWR06203 0.10.6 bar 0.080.5 bar 6 bar 1 + 15
amount of the switching differential. (See also
DWR1203 0.21.6 bar 0.150.6 bar
page 27, 2. Calibration at upper switching point).
In version ...-203 the switching differential is
DWR3203 0.22.5 bar 0.171.2 bar 16 bar 1 + 18
adjustable. The basic calibration is maintained.
DWR6203 0.56 bar 0.31.4 bar
Bursting pressure
DWR625203 0.56 bar 0.42.5 bar 25 bar 1 + 17
For all types 100 bar, verified by TV test.
DWR16203 316 bar 0.753.15 bar
Switching differential For values see Product
DWR25203 425 bar 1.36.0 bar 63 bar 1 + 16
Summary.
DWR40203 840 bar 2.36.6 bar
Contact arrangement Single pole changeover
switch.
Switching 250 VAC 250 VDC 24 VDC
capacity (ohm) (ind) (ohm) (ohm)
Normal 8 A 5 A 0.3 A 8 A
Protection class IP 54 according to
DIN 40 050
-DWR
see page 69
DVGW
Protection Class:
s IP 54
tested
TV
Accessories Solenoid valves Flow monitors Temperature sensors Thermostats Pressure transmitters Pressure switchesMechanical pressure switches
55
Tested to PE Directive 97/23/EC
Safety-engineered maximum
pressure monitors
Maximum pressure monitors
Technical data
Sensorof special constructio, self-monitoring via safety diaphragm, type-tested according to
Pressure connection
VdTV MemorandumPressure 100". SIL2 according IEC 61508-2
External thread G 1/2 (pressure gauge
connection) according to DIN 16 288 and
Type Setting range Switching Max. Dimen-
interval thread G 1/4 to ISO 228 Part 1.
differential permissible sioned
Switch housing 500
(mean values) pressure drawing
Diecast aluminium GD AI Si 12.
Aluminium housing coated with
resistant plastic.
page 25 + 26
DWAM06-576 0.10.6 bar 0.04 bar 5 bar
Mounting position
Vertically upright. DWAM1-576 0.21.6 bar 0.05 bar 5 bar
DWAM2,5-576 0.42.5 bar 0.07 bar 5 bar 2 +
Protection class IP 65.
DWAM6-576 1.26 bar 0.2 bar 10 bar 15
Ex protective category
DWAM625-576 1.26 bar 0.25 bar 20 bar
Ex-i (only when used in conjunction with
DWAM16-576 316 bar 0.4 bar 20 bar 2 +
suitable isolating amplifier).
DWAM32-576 632 bar 1.2 bar 45 bar 19
Component testing See table on page 52.
Versions:
Pressure sensor materials
Housing: 1.4104 ZF 577: Maximum pressure limiter (with internal interlock)
Pressure bellows: 1.4571
Microswitch not positive opening, contacts: silver alloy other equimpent like DWAM576.
All parts fully welded.
Max. pressure limiter DWAM1-577 (isnt in article master data). Please use DWAM2,5-577.
Ambient temperature
DWAM: 20C to +60C, DWR: 25C to
+60C. At ambient temperatures at or below
Maximum pressure monitors
0C, ensure that condensation cannot occur in
the sensor or in the switching device.
Sensorof special constructio made from stainless steel. (Component testing with 2 million
operating cycles). Component tests: VdTV MemorandumPressure 100", DIN EN1854 (fuel gases),
Max. temperature of medium at sensor
+ 60C. DIN EN764-7, systems in accordance to DIN EN12952-11 and DIN EN12953-9.
SIL 2 according ICE 61508-2
Outdoor installations
Protect the device against direct atmospheric
Type Setting range Switching Max. Dimen-
influences. Provide a protective cover.
differential permissible sioned
Max. working pressure
(mean values) pressure drawing
See Product Summary
Switching pressure setting page 25 + 26
Adjustable with the setting spindle after
DWR06-576 0,10,6 bar 0,04 bar 6 bar 2 +
removing the terminal box.
DWR1-576 0,21,6 bar 0,06 bar 6 bar 15
Mounting
DWR3-576 0,22,5 bar 0,1 bar 16 bar 2 +
With suitable weld-on connections and union
DWR6-576 0,56 bar 0,2 bar 16 bar 18
nuts or with pressure gauge screw union G 1/2.
DWR625-576 0,56 bar 0,25 bar 25 bar 2 +
Power supply circuit
DWR16-576 316 bar 0,5 bar 25 bar 17
U 14 V DC
i
DWR25-576 425 bar 1,0 bar 63 bar 2 +
R 1500 Ohm
i
C 1 nF DWR40-576 1040 bar 1,3 bar 63 bar 16
i
L 100 H
i
Connection diagrams
Versions:
ZF 577: Maximum pressure limiter (with internal interlock)
Microswitch not positive opening, contacts: silver alloy other equimpent like DWR 576
Calibration
Devices of the DWR-576 and DWAM-576 series are calibrated for rising pressure. This means that
576
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
DVGW
Protection Class:
s IP 65
tested
TV
Accessories Solenoid valves Flow monitors Temperature sensors Thermostats Pressure transmitters Pressure switches