Differential pressure switch for liquid, gas (DDCM)

FEMA differential pressure monitors are suitable for monitoring and controlling differential pressures, flow monitoring and automatic control of filter systems. A double chamber system with stainless steel bellows or Perbunan diaphragm detects the difference between the two applied pressures.

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For flow monitoring and differential pressure control of steam, gas, hot/cold water and automatic checking of filter plant.

 

Kind of pressure differential pressure, relative
Pressure connection internal thread G1/4
Electrical connection Plug DIN EN 175301
Protection class IP54
Housing material rugged housing of seawater resistant aluminium die casting GD Al Si 12
Media temp. -25 … 70 oC
Media temp. limit temperatures up to 85 oC are allowable for short periods. Higher temperatures are possible, provided that the limit is safeguarded by suitable measures (e.g. water tube trap, see Accessories for Pressure Switches / Transmitters)
Ambient temperature -25 … 70 oC
Ambient temp. limit at temperatures below 0 oC, ensure that no water condensation can arise in the sensor and in the switching device
Switch function/capacity SPDT Microswitch; capacity 5 A inductive, 8 A resistive
Optional functions add the type numbers below to the listed type numbers for extra functionality as described

• -301: terminal connection housing, IP65
• -205: maximum limiter with reclosing lock-out, interlocking with increasing pressure
• -206: Minimum limiter with reclosing lock-out, interlocking with falling pressure
• -307: two microswitches, switching in parallel or in succession, fixed switching interval, terminal connection case, IP65 (with the exception of DDCM252, 662, 1602, 6002)
• -217: two microswitches, 1 plug, switching in succession, adjustable switching interval (with the exception of DDCM252, 662, 1602, 6002)
• -213: gold-plated contacts, switching capacity: max. 24 Vdc, 100 mA, min. 5 Vdc, 2 mA. And others not available with adjustable switching difference.
• -351: protection class IP65 and switching housing with surface protection (chemical version)
• -513: gold-plated contacts, switching differential permanent, IP65, switching capacity: max. 24 Vdc, 100 mA, min. 5 Vdc, 2 mA; suitable isolating switching amplifier necessary, degree of protection Ex-i
Certificates SIL2 according IEC 61508-2

 

Pressure adjustment range Switching differential Max. pressure Sensing element material Type
bar bar bar
0.004 … 0.025 0.002 0.5 Perbunan + Aluminium DDCM252
0.01 … 0.06 0.015 1.5 Perbunan + Aluminium DDCM662
0.02 … 0.16 0.02 3 Perbunan + Aluminium DDCM1602
0.1 … 0.6 0.035 3 Perbunan + Aluminium DDCM6002
-0.1 … 0.4 0.15 15 1.4305 + 1.4571 DDCM014
0.2 … 1.6 0.13 15 1.4305 + 1.4571 DDCM1
1 … 4 0.2 25 1.4305 + 1.4571 DDCM4
0.5 … 6 0.2 15 1.4305 + 1.4571 DDCM6
3 … 16 0.6 25 1.4305 + 1.4571 DDCM16
Description Additional Product Type
Syphon for high temperature, steel, U-shape (for more accessories, see Accessories for Pressure Switches / Transmitters) U430B  
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