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RCM Flow Meter Transmitters

Our 4-20 mA Transmitters (option W2 and W3) are now CSA Approved for Hazardous Locations Ex ia IIC: Class I, Zone 0
Economical single package solution includes sensor and transmitter:
  • Differential Pressure measuring principle avoids problems associated with sticking floats and plugging passages.
  • Solid state strain gauge senses differential pressure directly
  • Low maintenance design with no moving parts.
  • Designed for use with computer control systems or remote readouts
  • Signal is proportional to flow rate squared (r²). (Square root extraction is required in the receiving device.)
  • Intrinsic safety option for Class I Div. I, Groups A,B,C,D; Class II Div 1, Groups E,F,G; EExia IIc T4 (CSA and Cenelec approvals pending).
W2 Option


The W2 option includes a mechanical analog indicator with the solid state strain gauge mounted on top sensing the differential pressure directly and providing a loop powered 4-20mA signal proportional to flow squared (r²).

RW3 Option


The New digital display flow meter is a 2 wire loop powered 4-20mA DC indicator that displays a flow rate and total. On-screen engineering units are easily configured. Password protection and 16 bit A/D resolution. A New built in wet/wet differential pressure sensor is protected by an isolated stainless steel diaphragm and provides a 4-20mA DC signal to the display. The enclosure is IP67 / NEMA 4X rated which further enhances this models capability. Available in threaded or flanged connection and bronze or stainless steel construction.

W3 Option


Economical single package solution for monitoring flow to a remote control room. A solid state strain gauge senses the differential pressure directly which provides a loop powered 4-20mA signal proportional to flow squared (r²).

WXYZ Option


The flow meter is available with either a 4-20mA output (Option W), a 0-1000 Hz frequency (Option Y), set point switching (Option X) and Option Z which combines W, X, & Y for interfacing with controllers, computers and alarms. The output signal is linear.

Option 4-wire (option W, Y, Z) 2-wire (option W2, W3)
Accuracy Horizontal Flow ±3% F.S. above 30% F.S. ±3% F.S. above 15% F.S.
Accuracy Vertical Flow ±5% F.S. above 30% F.S. ±3% F.S. above 15% F.S.
Ambient temp limit 120°F | 50°C 120°F | 50°C
Current output 4-20 mA into 800 ohms max. (linear with flow) 4-20 mA into 650 ohms max. (350 ohms with option R) (current proportional to flow rate squared)
Contact rating (option X, Z) 3.0 amp @ 24 V, 1.0 amp @ 117 V, 0.5 amp @ 230 V n/a
Frequency output (option Y) 1000 Hz F.S. 5 V peak, 270 us on time

CSA Approved Intrinsically Safe Entity

Electrical rating General Purpose

Ex ia IIC: Class I, Zone 0: Cl. I, Groups A,B,C,D; Cl. II, Groups E,F G. Temp Code T3 at Tamb 50o C

Power input 24 Vdc, 100 mA 24 Vdc, 25 mA
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