Gems Sensors RotorFlow Electronic Flow Sensor, 0.1 gal/min → 5 gal/min, RFO Series

  • RS Stock No. 907-3953
  • Mfr. Part No. 155421
  • Manufacturer Gems Sensors
Technical data sheets
Legislation and Compliance
RoHS Certificate of Compliance
Product Details

Gems Sensors Flow Sensor

The Gems Sensors RFO series rotor flow electronic sensor sense a liquid flow rate of 0.5gal/min to 5gal/min. The sensors popularised the rotor flow paddle wheel design by combining high visibility rotors with solid-state electronics packaged into a compact, panel mount housings. It provides an accurate flow rate output with an integral visual confirmation and an unprecedented price/ performance ratio. The output signal for RFO is an on/off the pulse of the DC voltage supplied to the unit, it is compatible with all digital logic families. The frequency of the output pulse is proportional to the flow rate and ranges from approximately 15Hz to 180Hz.

Features and Benefits

Pipe diameter range is 1/4in
Accurate flow rate indication with integral visual confirmation
It is available in polypropylene body material
The pulsed output is 4.5VDC to 24VDC
Connection type is 1/4 NPT female
Maximum operating pressure is 6.9bar
Maximum operating temperature is 80°C


Visual flow confirmation on heat exchangers
Plastic injection moulding equipment


CE certified
cRUus certified

Attribute Value
Media Monitored Liquid
Device Type RotorFlow Electronic
Minimum Flow Rate 0.1 gal/min
Maximum Flow Rate 5 gal/min
Supply Voltage 4.5 → 24 V dc
Pipe Diameter Range 1/4 in
Connection Type 1/4 NPT Female
Maximum Pressure 6.9bar
Material Ploypropylene
Maximum Media Temperature +21°C
Minimum Operating Temperature -29°C
Maximum Operating Temperature +82°C
Series RFO
Current Rating 8 mA
4 In stock for delivery within 4 working days
Price Each
SGD 223.22
(exc. GST)
SGD 238.85
(inc. GST)
Per unit
1 +
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