DWAM, DWAMV, SDBAM
Pressure monitors / pressure limiters
These series are particularly suitable for
maximum pressure monitoring in steam and
hot-water systems. The pressure switch is
"of special construction", with a self-monitoring
pressure sensor, built in accordance with
Pressure Equipment Directive PED 97/23/EC.
It can be used as a pressure monitor or
a pressure limiter for maximum pressure
monitoring (systems in accordance with
TRD 604 DIN EN12828) systems in
accordance with DIN EN12952-11 and
DIN EN12953-9 and is available with or
without adjustment.
SIL 2 according IEC 61508-2
DWAM1
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.
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
according to DIN 1725
Mounting position
Vertically upright and horizontal.
Ambient temperature at switching device
–20 to +70°C.
Medium temperature
–20 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 upper limit at the
switching device is 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 for maximum pressure switch
The pressure monitors and safety pressure
limiting devices are calibrated so that,
under
rising pressure,
switching takes place at the
defined switching pressure. The reset point
under falling pressure is lower by the amount of
the switching differential, or, in the case of
pressure limiting devices, by the fall in pressure
specified in the table. The scale value
corresponds to the upper switching point.
Switching differential
See Product Summary.
Contact arrangement
Single-pole changeover switch.
Switching
250 VAC 250 VDC 24 VDC
capacity
(ohm) (ind) (ohm) (ohm)
Normal
8A 5A
0.3 A
8A
Sealing P2
Generally available for SDBAM limiters.
Bursting pressure
For all types
≥
100 bar.
Verified by TÜV test.
Component tested for
Testing basis
Function
Directing of action
Sensor
Pressure monitor / Pressure limiter
For maximum pressure monitoring only
"Of special construction"
(self-monitoring sensor with
safety diaphragm)
Product Summary Maximum pressure monitoring ( )
(for other pressure ranges see DWR series)
Type
Setting range
Switching
Max.
Dimen-
differential
permissible
sioned
(mean values)
pressure
drawing
Pressure monitors without differential adjustment
for max. pressure monitoring
page 21 + 22
DWAM06
0.1…0.6 bar
0.04 bar
5 bar
DWAM1
0.2…1.6 bar
0.05 bar
5 bar
1 + 15
DWAM6
1.2…6 bar
0.2
bar
10 bar
DWAM625
1.2…6 bar
0.25 bar
20 bar
DWAM16
3…16 bar
0.4
bar
20 bar
1 + 19
DWAM32
6…32 bar
1.2
bar
45 bar
Pressure monitors with differential adjustment for max. pressure monitoring
DWAMV1
0.2…1.6 bar
0.12…0.6 bar
5 bar
1 + 15
DWAMV6
1.2…6 bar
0.4…1.5 bar
10 bar
DWAMV16
3…16 bar
0,8…2,5 bar
20 bar
1 + 19
DWAMV32
6…32 bar
2.5…6.0 bar
45 bar
Pressure limiters for maximum pressure monitoring (with internal interlock)
Pressure change
for unlocking
SDBAM1
0.2…1.6 bar
0.12 bar
5 bar
SDBAM2,5
0.4…2.5 bar
0.15 bar
5 bar
1 + 15
SDBAM6
1.2…6 bar
0.4 bar
10 bar
SDBAM625
1.2…6 bar
0.6 bar
20 bar
SDBAM16
3…16 bar
0.8 bar
20 bar
1 + 19
SDBAM32
6…32 bar
3.0 bar
45 bar
* If a downstream external interlock is added, DWAM... pressure monitors can also be used
as pressure limiters (see page 51).
· Sealing device P2 is included for SDBAM limiters and can also be retrofitted to pressure monitors on
request. See sealing P2.
· DWAM... also available in Ex-i equipment. See DBS series.
s
tested
Protection Class:
IP 54
Accessories
Minimum pressure controls
– Minimum pressure monitor: DWR… page 50
– Minimum pressure limiter: DWR…-206 page 56
Solenoid valves
Flow monitors
Temperature sensors
Thermostats
Steam
Systems according to TRD 604
Hot water
Systems according to DIN EN12828
VdTÜV Memorandum "Pressure 100"
Pressure transmitters
Pressure switches
Mechanical pressure switches
Tested to PE Directive 97/23/EC
49
50
Mechanical pressure switches
Tested to PE Directive 97/23/EC
DBS
Pressure monitors / pressure limiters
In many aspects, safety-engineered pressure
limiters offer a higher degree of safety compared
with normal pressure switches and are therefore
especially suitable for chemical process
engineering and thermal installations in which
safety is an especially critical factor in pressure
monitoring. Pressure switches can also be used
in Ex- zones (zone 0, 1, 2 and 20, 21, 22) and,
in all cases, require an isolating amplifier.
The isolating amplifier is also responsible for
monitoring lines for short-circuit and line
break and therefore offers an additional safety
advantage – even in non-Ex-zones. For
Ex-applications, the isolating amplifier must be
installed outside the Ex-zone. The lines between
the isolating amplifier and the pressure switch
are monitored for short-circuit and line break.
SIL 2 according IEC 61508-2
DWAM6-576
Technical data
Greater safety
· in process engineering and chemical
installations,
· in gas and liquid gas installations
Basic features:
– "Of special construction" according to VdTÜV
Memorandum "Pressure 100"
– Line break and short-circuit monitoring-
between pressure switch and isolating
amplifier
– Suitable for Ex areas (zone 0, 1 & 2 or 20, 21
& 22) (explosion protection Ex-ia)
– Degree of protection IP 65
– Plastic-coated housing (chemical version)
Options:
– Limiter with internal interlock
Type-specific features:
– Self-monitoring sensors
– Positive opening microswitches
– Gold-plated contacts
– TÜV, DVGW component tests
Safety requirements for pressure limiters
Pressure limiters "of special construction" (DBS) must fulfil additional safety requirements, i.e. breakage
or leakage in the mechanical part of the sensor must lead to shutdown to the safe side. The pressure
limitermust respond as if the system pressure had already exceeded the maximum limit. The control
circuit for the pressure limiter must also be considered from the point of view of safety, as short-circuits
in the supply lines or other faults in the control current circuit can lead to dangerous conditions.
Switching element with positive opening operation and gold-plated contacts
The microswitch is equipped with positive opening operation. Rather than transmitting the plunger force
via a spring, which is the usual method with most microswitches, this newly developed microswitch has
an additional lever which transmits the movements of the pressure bellows positively to the contact lever.
If the spring breaks, the contact lever is moved directly.
Line break and short-circuit monitoring in the control circuit
The resistor connected in series with the switching contact limits the current to a defined value with the
switch closed. In the event of short-circuit in the area between the isolating amplifier and the series
resistor, the current rises above the predetermined limit value, the relay of the isolating amplifier drops
out, the output current circuit is interrupted and thus the safe condition is achieved. In the event of a line
break, the current flow is interrupted, the relay drops to the safe side and interrupts the output current
circuit (safety sequence). Furthermore, the isolating amplifier is designed so that, if faults occur in the
electronics (conductor interruption, component defect etc.) and in the resulting situations, the safe
shutdown condition is assured. These characteristics of the safety-engineered isolating amplifier,
including line break and short-circuit monitoring, satisfy the requirements of DIN/VDE 0660, Part 209.
Connection diagram
For pressure monitoring in Ex areas, the isolating amplifier must be installed outside the Ex-zone.
The pressure limiter has an intrinsically safe control current circuit (Ex-ia). This arrangement is suitable
for zones 0, 1 and 2, 20, 21 and 22.
Safety-engineered maximum
pressure monitors
Technical data
Pressure connection
External thread G 1/2 (pressure gauge
connection) according to DIN 16 288.
Switch housing 500
Diecast aluminium GD AI Si 12.
Aluminium housing coated with
resistant plastic.
Degree of protection
IP 65.
Ex protective category
Ex-ia (only when used in conjunction with
suitable isolating amplifier).
Component testing
See table on page 46.
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 21 + 22
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
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 21 + 22
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 23, 2. Celebration
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
51
52
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 21 + 22
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 23, 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
15
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