Flow Switches (RFQ)

High-Reliability Flow & Level Switches

Rheotherm flow switches offer a robust, solid-state solution for detecting flow/no-flow conditions and liquid levels with extreme precision and zero maintenance.

• No Moving Parts: The sensor is entirely solid-state; it will not stick, wear, or break, even in slurries or high-viscosity fluids.
• Extreme Sensitivity: Capable of detecting liquid flow rates as low as one gallon per year and gas flow at very low velocities.
• Versatile Media Handling: Successfully monitors everything from clean liquids and gases to corrosive chemicals and thickened slurries.
• Hazardous Area Ready: Available with FM approvals for intrinsically safe installations.
• Durable Construction: Standard 316 stainless steel wetted parts, with options for Hastelloy C, Monel, and other alloys to match your process chemistry.
• Application Specific: Specialized designs available
• ISO 9001:2015 Certified: Backed by decades of manufacturing expertise and a rigorous Quality Assurance program.

How to Request a Quote:

1. Submit Online: Complete the form on this page with your process details or upload your datasheets for review.
2. Email Us: Download and complete the Flow Application Data Sheet and email it to us at sales-flow@bionetics.com.

You can also call or visit our Contact Us page for telephone, fax, and email information.

• SPECIFICATIONS
• FLOW RANGES
• DOCUMENTATION

 

 

	Standard	Options
Temperature	Process: 0 – 140°F (-18 – 60°C) Environment: 0 – 120°F (-18 – 50°C)	Inline: -20 – 350°F (-30 – 175°C) Probe: -20 – 400 °F (-30 – 200 °C)
Pressure	0 – 1,000 PSI	Up to 30,000 PSI
Calibration Accuracy	± 1% of reading typical
Response Time	1 sec. ; 3 – 5 sec. typ. (63% of range);	Time constant/delay option
Repeatability	± 0.5% of reading
	Standard	Options
Line Sizes	Inline sensor (flow range dependent): – Capillary; – 1/16”; 1/8”; 3/16”; 1/4” – 3/8”; 1/2”; 5/8”; 3/4”; 1” Probe sensor: Pipe/Duct from 1.5” – 72” (round, square, rectangular)	Other sizes via fittings/adapters
Process Connection	Inline sensor: Plain tube stubs suitable for compression fittings Probe sensor: 1″ MNPT	– MNPT; – Tri-Clover (Sanitary); – SS Flange (1/2” – 2”); Most other fittings available
Wetted Material	316 SS	– Hastelloy C-276®; – Monel®; – Alloy 20; – Titanium; – Tantalum; – Inconel
	Standard	Options
Enclosure	Sensor: – Inline – PVC – Probe – NEMA 4X (junction box) Electronics: – Integrated – NEMA 4X Cast Aluminum – Remote – NEMA 4	Inline sensor: Stainless steel Remote electronics: – Stainless steel – NEMA 7 Explosion-proof
Hazardous Environment		Remote electronics with 100FS only FM Approved for: – Class I, Div. 1, Groups A,B,C,D – Class I, Zone 1, IIB+H2 (US) – Class II, Div. 1, Groups E, F, G – Class III, Div. 1
Outputs	Single SPDT Form C relay (10A, 125 VAC)	Remote electronics with 100FS only – Second independent SPDT relay – DPDT relay – Time delay on switch
Input Power	110/230 VAC ±10V	24 VDC ±4V (200 mA)

Inline Sensor Flow Capacities for Liquids

	TUBE SIZE
FLOW RATE LIMITS	C	1/16	1/8	3/16	1/4	3/8	1/2	5/8*	3/4*	1*
Extended Maximum	2	60	500	0.4	1	2.5	4.6	8	10	20
Normal Maximum	1	30	250	0.25	0.5	1	2	3.5	4.5	8
Normal Minimum	0.03	0.8	6	0.008	0.01	0.03	0.05	0.2	0.3	0.5
Extended Minimum	0.007	0.05	3	0.002	0.006	0.01	0.02	0.07	0.1	0.2
	cc/min			GPM

*Limited applications. Consult Factory

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Inline Sensor Flow Capacities for Gases

	TUBE SIZE
FLOW RATE LIMITS	C	1/16	1/8	3/16	1/4	3/8	1/2	5/8	3/4	1
Extended Maximum	0.027	1.25	5	11	20	45	80	125	180	320
Normal Maximum	0.017	0.75	3	7	15	34	70	109	160	280
Normal Minimum	0.0017	0.02	0.1	0.2	0.4	0.9	1.6	2.5	3.6	6.4
Extended Minimum	0.0009	0.0017	0.05	0.1	0.2	0.5	0.8	1.2	2	3.2
	SCFM

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Probe-type Sensor Flow Capacities for Gases

	NPT/2I
VELOCITY LIMITS (ft/min)	Liquid*	Gas
Maximum	150	25,000
Minimum	0.5	25

*Liquid Applications limited to Flow Switches only

 

Product Brochure	Rheotherm Flow Application Data Sheet (download document)
Rheotherm Method of Operation	Standard Dimensions Insertion Probe Sensor
Rheotherm Sensor Selection Guide	Standard Dimensions Inline (TU/TUL) Sensor
Rheotherm Model Selection Guide