Ex-DWR pressure monitors / pressure limiters

The Ex-DWR pressure monitors are particularly suitable as pressure monitors or pressure limiters for fuel gases according to DVGW worksheet G 260, liquid fuels, steam systems according to TRD 604 and hot-water systems according to DIN EN 12828. They can also be used in systems according to DIN EN 12952-11 and DIN EN 12953-9.

Ex-DDCM differential pressure switches are suitable for monitoring and controlling differential pressures, for flow monitoring and for the automatic control of filter systems. A dual-chamber system with a stainless-steel bellows or Perbunan diaphragm detects the difference between the two applied pressures. The required switching pressure is continuously adjustable within the listed ranges. All differential pressure monitors can also be used in the vacuum range. The switching differential is not adjustable.

The devices feature a robust housing made of seawater-resistant die-cast aluminium GD Al Si 12. Mounting is carried out directly on the pressure line or on a flat surface using two Ø 4 mm screws.

Pressure line connection: P (+) = high pressure, S (-) = low pressure.

Features and benefits

• The Ex-DDCM series is calibrated for falling pressure.
• 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.

Certifications

• SIL2 according to IEC 61508-2
• IBExU12ATEX1040 according to ATEX 2014/34/EU
• IECEx IBE 14.0077

Technical data

• Minimum operating ambient temperature: -20 °C
• Maximum operating ambient temperature: 60 °C
• Brand: FEMA | Honeywell
• Switch configuration: SPDT microswitch 250 V; switching capacity 2 A inductive, 3 A resistive
• Scale calibration: rising pressure
• Approvals: DIN EN 12828, DIN EN 12952-11, DIN EN 12953-9, DIN 16 288, ISO 228 Part 1, DIN EN 764-7, TRD 604, G 260
• Pressure type: relative overpressure
• Mounting type: pressure line or flat surface
• Connection type: internal thread G 1/4″, external thread G 1/2″