Gems Sensors RFO Series Flow Sensor to 5gal/min, Female, 1/2 in, 3/4 in, 1 in, 9/16 in, NPT

RS Stock No.:: 907-3953
Distrelec Article No.:: 137-59-547
Mfr. Part No.:: 155421
Brand:: Gems Sensors

Gems Sensors RFO Series Flow Sensor to 5gal/min, Female, 1/2 in, 3/4 in, 1 in, 9/16 in, NPT

Subtotal (1 unit)*

£133.17

(exc. VAT)

£159.80

(inc. VAT)

FREE delivery for orders over £60.00

In Stock

Plus 63 unit(s) shipping from 27 April 2026
Plus 11 unit(s) shipping from 27 April 2026
Plus 165 unit(s) shipping from 04 May 2026

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Units	Per unit
1 +	£133.17

*price indicative

RS Stock No.:: 907-3953
Distrelec Article No.:: 137-59-547
Mfr. Part No.:: 155421
Brand:: Gems Sensors

Specifications

Technical Reference

Legislation and Compliance

Product Details

Find similar products by selecting one or more attributes.

Select all	Attribute	Value
	Brand	Gems Sensors
	Product Type	Flow Sensor
	Connection Thread Size	1/2 in, 3/4 in, 1 in, 9/16 in
	Connection Thread Standard	NPT
	Connection Gender	Female
	Body Material	Polypropylene
	Maximum Operating Temperature	82°C
	Standards/Approvals	RoHS, File No. E45168
	Series	RFO
	Maximum Flow Rate	5gal/min

	Select all
	Brand Gems Sensors
	Product Type Flow Sensor
	Connection Thread Size 1/2 in, 3/4 in, 1 in, 9/16 in
	Connection Thread Standard NPT
	Connection Gender Female
	Body Material Polypropylene
	Maximum Operating Temperature 82°C
	Standards/Approvals RoHS, File No. E45168
	Series RFO
	Maximum Flow Rate 5gal/min

Datasheet

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

Applications

Visual flow confirmation on heat exchangers

Plastic injection moulding equipment

Certifications

CE certified

cRUus certified