Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

3G Electric
RFQ CartGet a QuoteSign inSign up
GEMS SENSORS Liquid Flow Switch: Brass, 1/2 in FNPT, 1/2 in Connection Size, FNPT - Flow Sights with Remote Output
GEMS SENSORSFlow Sights with Remote Output

GEMS SENSORS Liquid Flow Switch: Brass, 1/2 in FNPT, 1/2 in Connection Size, FNPT

The GEMS SENSORS Liquid Flow Switch: Brass (MPN RFS, 156268) is a flow sight with remote output featuring a 1/2 in FNPT connection. It is UL Listed with an SPDT switch type, normally closed position, and Viton wetted…

SKU 3G-OTH-90807

Brand
GEMS SENSORS
Item
Liquid Flow Switch: Brass, 1/2 in FNPT, 1/2 in Connection Size, FNPT
Category
Flow Sights with Remote Output
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineer
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Technical Specifications

GEMS SENSORS
Manufacturer Part Number
RFS, 156268
Type
FNPT, -20°F – 212°F
FNPT
1/2 in
Standards
UL Listed
Switch Type
SPDT
Connection Size
1/2 in
Connection Type
FNPT
Switch Position
Normally Closed
Wetted Material
Viton
View Full Spec Sheet

Technical Documents

No technical documents available for this product.
Request documentation →
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

GEMS SENSORS Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The GEMS SENSORS Liquid Flow Switch: Brass (MPN RFS, 156268) is a flow sight with remote output featuring a 1/2 in FNPT connection. It is UL Listed with an SPDT switch type, normally closed position, and Viton wetted material, operating in a temperature range of -20°F to 212°F.

Frequently Asked Questions

What is the GEMS SENSORS RFS 156268 liquid flow switch used for?

The GEMS SENSORS RFS 156268 liquid flow switch is used to detect flow or no-flow conditions in industrial piping systems. It provides a remote electrical output via its SPDT switch, making it suitable for process control, pump protection, and alarm systems in water, chemical, and HVAC applications.

What are the specifications of the GEMS SENSORS RFS 156268 flow switch?

The GEMS SENSORS RFS 156268 is a brass liquid flow switch with a 1/2 in FNPT connection. It features an SPDT switch type, normally closed position, and Viton wetted material. It is UL Listed and operates in a temperature range of -20°F to 212°F.

Where to buy the GEMS SENSORS RFS 156268 flow switch worldwide?

You can source the GEMS SENSORS RFS 156268 flow switch worldwide through 3G Electric. As a global industrial equipment distributor, 3G Electric handles full logistics, customs clearance, and delivery to your location. Contact us for availability and lead time.

How to install the GEMS SENSORS RFS 156268 flow switch?

Install the GEMS SENSORS RFS 156268 flow switch by mounting it in a horizontal pipe section with the flow arrow aligned to flow direction. Use PTFE tape on the 1/2 in FNPT threads. Wire the SPDT normally closed switch per your control circuit. Ensure the Viton seals are compatible with your fluid.

Used in

Common applications for GEMS SENSORS
Burner management — GEMS SENSORS FS-4 piston flow switch for monitoring cooling water flow in industrial burners
Pump protection — GEMS SENSORS FS-380 high-pressure flow switch to detect loss of flow in pump systems
Process control — GEMS SENSORS 230500 thermal-dispersion flow switch for low-flow detection in chemical processes
Cooling systems — GEMS SENSORS RFS flow sight with remote output for visual and electrical flow indication in heat exchangers
Water treatment — GEMS SENSORS FT-110 turbine flow sensor for measuring flow rates in filtration systems
Hydraulic systems — GEMS SENSORS FS-500 polypropylene piston flow switch for corrosive fluid monitoring in hydraulic circuits

GEMS SENSORS Products

3G Electric supplies GEMS SENSORS flow sights with remote output. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

Similar products

Matched by specification & description
GEMS SENSORS Liquid Flow Switch: Polypropylene, 1/4 in FNPT, 1/4 in Connection Size, FNPT, SPDT (MPN RFS, 155425). Key specifications — Switch Type: SPDT; Switch Position: Normally Closed; Brand: GEMS SENSORS; Connection Type: FNPT; Standards: UL Listed; Wetted Material: Buna-N.
GEMS SENSORS
GEMS SENSORS Liquid Flow Switch: Polypropylene, 1/4 in FNPT, 1/4 in Connection Size, FNPT, SPDT (MPN RFS, 155425). Key specifications — Switch Type: SPDT; Switch Position: Normally Closed; Brand: GEMS SENSORS; Connection Type: FNPT; Standards: UL Listed; Wetted Material: Buna-N.
GEMS SENSORS Liquid Flow Switch: Piston, Brass, 1/4 in FNPT, 1/4 in Connection Size, FNPT, SPDT (MPN FS-926, 26939). Key specifications — Brand: GEMS SENSORS; Hazardous Location Specification: Class I, Div 2, Group A, B, C, D; Set Point Type: Fixed; Switch Position: Normally Open; Contact Rating (DC): 20 V.
GEMS SENSORS
GEMS SENSORS Liquid Flow Switch: Piston, Brass, 1/4 in FNPT, 1/4 in Connection Size, FNPT, SPDT (MPN FS-926, 26939). Key specifications — Brand: GEMS SENSORS; Hazardous Location Specification: Class I, Div 2, Group A, B, C, D; Set Point Type: Fixed; Switch Position: Normally Open; Contact Rating (DC): 20 V.
GEMS SENSORS Liquid Flow Switch: Piston, Brass, 1/4 in FNPT, 1/4 in Connection Size, FNPT, SPDT (MPN FS-926, 26938). Key specifications — Brand: GEMS SENSORS; Hazardous Location Specification: Class I, Div 2, Group A, B, C, D; Set Point Type: Fixed; Switch Position: Normally Open; Contact Rating (DC): 20 V.
GEMS SENSORS
GEMS SENSORS Liquid Flow Switch: Piston, Brass, 1/4 in FNPT, 1/4 in Connection Size, FNPT, SPDT (MPN FS-926, 26938). Key specifications — Brand: GEMS SENSORS; Hazardous Location Specification: Class I, Div 2, Group A, B, C, D; Set Point Type: Fixed; Switch Position: Normally Open; Contact Rating (DC): 20 V.
GEMS SENSORS Liquid Flow Switch: Piston, Brass, 1/4 in FNPT, 1/4 in Connection Size, FNPT, SPDT (MPN FS-926, 26941). Key specifications — Brand: GEMS SENSORS; Hazardous Location Specification: Class I, Div 2, Group A, B, C, D; Set Point Type: Fixed; Switch Position: Normally Closed; Contact Rating (DC): 20 V.
GEMS SENSORS
GEMS SENSORS Liquid Flow Switch: Piston, Brass, 1/4 in FNPT, 1/4 in Connection Size, FNPT, SPDT (MPN FS-926, 26941). Key specifications — Brand: GEMS SENSORS; Hazardous Location Specification: Class I, Div 2, Group A, B, C, D; Set Point Type: Fixed; Switch Position: Normally Closed; Contact Rating (DC): 20 V.
GEMS SENSORS Liquid Flow Switch: Piston, Brass, 1/4 in FNPT, 1/4 in Connection Size, FNPT, SPDT (MPN FS-926, 26951). Key specifications — Brand: GEMS SENSORS; Hazardous Location Specification: Class I, Div 2, Group A, B, C, D; Set Point Type: Fixed; Switch Position: Normally Open; Contact Rating (DC): 20 V.
GEMS SENSORS
GEMS SENSORS Liquid Flow Switch: Piston, Brass, 1/4 in FNPT, 1/4 in Connection Size, FNPT, SPDT (MPN FS-926, 26951). Key specifications — Brand: GEMS SENSORS; Hazardous Location Specification: Class I, Div 2, Group A, B, C, D; Set Point Type: Fixed; Switch Position: Normally Open; Contact Rating (DC): 20 V.
GEMS SENSORS Liquid Flow Switch: Piston, Brass, 1/4 in FNPT, 1/4 in Connection Size, FNPT, SPDT (MPN FS-926, 26952). Key specifications — Brand: GEMS SENSORS; Hazardous Location Specification: Class I, Div 2, Group A, B, C, D; Set Point Type: Fixed; Switch Position: Normally Open; Contact Rating (DC): 20 V.
GEMS SENSORS
GEMS SENSORS Liquid Flow Switch: Piston, Brass, 1/4 in FNPT, 1/4 in Connection Size, FNPT, SPDT (MPN FS-926, 26952). Key specifications — Brand: GEMS SENSORS; Hazardous Location Specification: Class I, Div 2, Group A, B, C, D; Set Point Type: Fixed; Switch Position: Normally Open; Contact Rating (DC): 20 V.

More from GEMS SENSORS

View all GEMS SENSORS parts →
GEMS SENSORS Liquid Flow Switch: Polypropylene, 1/2 in FNPT, 1/2 in Connection Size, FNPT, SPDT (MPN RFS, 155485). Key specifications — Switch Type: SPDT; Switch Position: Normally Open; Brand: GEMS SENSORS; Connection Type: FNPT; Standards: UL Listed; Wetted Material: Ceramic.
GEMS SENSORS
GEMS SENSORS Liquid Flow Switch: Polypropylene, 1/2 in FNPT, 1/2 in Connection Size, FNPT, SPDT (MPN RFS, 155485). Key specifications — Switch Type: SPDT; Switch Position: Normally Open; Brand: GEMS SENSORS; Connection Type: FNPT; Standards: UL Listed; Wetted Material: Ceramic.
GEMS SENSORS Liquid Flow Switch: Brass, 1 in FNPT, 1 in Connection Size, FNPT, -20°F – 212°F, SPDT (MPN RFS, 181688). Key specifications — Switch Type: SPDT; Switch Position: Normally Open; Brand: GEMS SENSORS; Connection Type: FNPT; Standards: CE Certified; Wetted Material: Ceramic.
GEMS SENSORS
GEMS SENSORS Liquid Flow Switch: Brass, 1 in FNPT, 1 in Connection Size, FNPT, -20°F – 212°F, SPDT (MPN RFS, 181688). Key specifications — Switch Type: SPDT; Switch Position: Normally Open; Brand: GEMS SENSORS; Connection Type: FNPT; Standards: CE Certified; Wetted Material: Ceramic.
GEMS SENSORS Flow Indicator: Rotor, 316 Stainless Steel, 1 in FNPT, 1 in Connection Size, FNPT (MPN RFO, 194762). Key specifications — Brand: GEMS SENSORS; Sight Material: Polysulfone; Connection Type: FNPT; Flow Direction: Horizontal Left; Seal Material: Viton; Wetted Material: Viton.
GEMS SENSORS
GEMS SENSORS Flow Indicator: Rotor, 316 Stainless Steel, 1 in FNPT, 1 in Connection Size, FNPT (MPN RFO, 194762). Key specifications — Brand: GEMS SENSORS; Sight Material: Polysulfone; Connection Type: FNPT; Flow Direction: Horizontal Left; Seal Material: Viton; Wetted Material: Viton.
GEMS SENSORS Liquid Flow Switch: Brass, 3/4 in FNPT, 3/4 in Connection Size, FNPT, -20°F – 212°F (MPN RFS, 180395). Key specifications — Switch Type: SPDT; Switch Position: Normally Closed; Brand: GEMS SENSORS; Connection Type: FNPT; Standards: UL Listed; Wetted Material: Ceramic.
GEMS SENSORS
GEMS SENSORS Liquid Flow Switch: Brass, 3/4 in FNPT, 3/4 in Connection Size, FNPT, -20°F – 212°F (MPN RFS, 180395). Key specifications — Switch Type: SPDT; Switch Position: Normally Closed; Brand: GEMS SENSORS; Connection Type: FNPT; Standards: UL Listed; Wetted Material: Ceramic.
GEMS SENSORS Flow Indicator: Rotor, Brass, 1/2 in FNPT, 1/2 in Connection Size, FNPT, Polysulfone (MPN RFO, 156262). Key specifications — Brand: GEMS SENSORS; Sight Material: Polysulfone; Connection Type: FNPT; Flow Direction: Horizontal Right; Seal Material: Viton; Wetted Material: Brass.
GEMS SENSORS
GEMS SENSORS Flow Indicator: Rotor, Brass, 1/2 in FNPT, 1/2 in Connection Size, FNPT, Polysulfone (MPN RFO, 156262). Key specifications — Brand: GEMS SENSORS; Sight Material: Polysulfone; Connection Type: FNPT; Flow Direction: Horizontal Right; Seal Material: Viton; Wetted Material: Brass.
GEMS SENSORS Flow Indicator: Rotor, Polypropylene, 1/4 in FNPT, 1/4 in Connection Size, FNPT, Buna-N (MPN RFO, 155421). Key specifications — Brand: GEMS SENSORS; Sight Material: Polysulfone; Connection Type: FNPT; Flow Direction: Horizontal Right; Seal Material: Buna-N; Wetted Material: Polypropylene.
GEMS SENSORS
GEMS SENSORS Flow Indicator: Rotor, Polypropylene, 1/4 in FNPT, 1/4 in Connection Size, FNPT, Buna-N (MPN RFO, 155421). Key specifications — Brand: GEMS SENSORS; Sight Material: Polysulfone; Connection Type: FNPT; Flow Direction: Horizontal Right; Seal Material: Buna-N; Wetted Material: Polypropylene.
GEMS SENSORS Flow Indicator: Rotor, Brass, 1/4 in FNPT, 1/4 in Connection Size, FNPT, Polysulfone (MPN RFO, 156261). Key specifications — Brand: GEMS SENSORS; Sight Material: Polysulfone; Connection Type: FNPT; Flow Direction: Horizontal Right; Seal Material: Viton; Wetted Material: Ceramic.
GEMS SENSORS
GEMS SENSORS Flow Indicator: Rotor, Brass, 1/4 in FNPT, 1/4 in Connection Size, FNPT, Polysulfone (MPN RFO, 156261). Key specifications — Brand: GEMS SENSORS; Sight Material: Polysulfone; Connection Type: FNPT; Flow Direction: Horizontal Right; Seal Material: Viton; Wetted Material: Ceramic.
GEMS SENSORS Liquid Flow Switch: Brass, 1/4 in FNPT, 1/4 in Connection Size, FNPT, -20°F – 212°F (MPN RFS, 156265). Key specifications — Switch Type: SPDT; Switch Position: Normally Open; Brand: GEMS SENSORS; Connection Type: FNPT; Standards: UL Listed; Wetted Material: Viton.
GEMS SENSORS
GEMS SENSORS Liquid Flow Switch: Brass, 1/4 in FNPT, 1/4 in Connection Size, FNPT, -20°F – 212°F (MPN RFS, 156265). Key specifications — Switch Type: SPDT; Switch Position: Normally Open; Brand: GEMS SENSORS; Connection Type: FNPT; Standards: UL Listed; Wetted Material: Viton.