Astra Automation > Products > Sensors and transducers > Pressure sensors > Explosion-proof pressure switch for steam, hot water, gas and fuel DWR-574 FEMA
Explosion-proof pressure switch for steam, hot water, gas and fuel DWR-574 FEMA

FEMA DWR-574 explosion-proof pressure switch. Equipped with a monitoring and limiting function. For use with steam, hot water, gas and fuel.


Product selection table
Model Setting range Hysteresis Pressure
maximum
DWR06-574 0,1… 06 bar 0,04 bar 6 bar
DWR06-574-S 0,1… 06 bar 0,04 bar 6 bar
DWR1-574 0,2… 1,6 bar 0,06 bar 6 bar
DWR1-574-S 0,2… 1,6 bar 0,06 bar 6 bar
DWR3-574 0,2… 2,5 bar 0,1 bar 16 bar
DWR3-574-S 0,2… 2,5 bar 0,1 bar 16 bar
DWR6-574 0,5… 6 bar 0,2 bar 16 bar
DWR6-574-S 0,5… 6 bar 0,2 bar 16 bar
DWR625-574 0,5… 6 bar 0,25 bar 25 bar
DWR625-574-S 0,5… 6 bar 0,25 bar 25 bar
DWR16-574 3… 16 bar 0,5 bar 25 bar
DWR16-574-S 3… 16 bar 0,5 bar 25 bar
DWR25-574 4… 25 bar 1,0 bar 63 bar
DWR25-574-S 4… 25 bar 1,0 bar 63 bar
Explosion-proof pressure switch for steam, hot water, gas and fuel DWR-574 FEMA

The pressure regulators of the DWR-574 FEMA series have been designed in such a way as to guarantee the highest level of safety. Therefore, they can be successfully used in chemical process engineering and thermal installations where safety in pressure monitoring is a particularly important factor. The pressure switches can also be used in hazardous areas (zones 0, 1, 2 and 20, 21, 22). In all cases, they require an isolation amplifier. The amplifier is responsible for monitoring the line for a short circuit and therefore provides additional safety, even in non-Ex zones. For Ex applications, the isolating amplifier must be installed outside the Ex zone. The lines between the isolation amplifier and the pressure switch are monitored for short circuit and line break.
Explosion proof code: Ex II 1 / 2G Ex ia IIC T6 Ga / Gb, Ex II 1 / 2D Ex ia IIIC T80oC.

Parameter Value
Type of pressure relative
Pressure connection internal thread G¼, external thread G½
Electrical connection M16x1,5
Protection class IP65
Case material - durable housing resistant to sea water GD Al Si 12
- aluminum housing covered with plastic
Material of the measuring element 1.4104 + 1.4571
Temperature of the medium -25 ... 60 ° C
Medium temperature limitation 65 ° C - higher temperatures are possible, but appropriate protection should be taken
Ambient temperature -25 ... 60 ° C
Limitation of the ambient temperature at temperatures below 0 ° C, make sure that there is no condensation in the sensor and switching device
Capacity power circuit: Ui = 14 V DC Ri = 1500 Ohm Ci = 1 nF Li = 100 MikroH
Certificates • TV.DWFS (SDBFS) .12-281 complies with VdTUEV Memorandum Pressure July 2006, DIN EN 12952-11 and DIN EN 12953-9: 2007
• ID 0000035004 in accordance with DIN EN 764-7: 2002 and DIN EN 13611: 2008
• CE-0085CL0343 according to DIN EN 1854, July 2006.
• 01 202 931-B-11-0003 in accordance with Directive 97/23 EC
• IBExU12ATEX1040 conforms to ATEX 94/9 / EG
• IECEx IBE 14.0077
• SIL2 according to IEC 61508-02