Duct Flow Meters for Air & Gas (RFQ)

High-Performance Duct Flow Meters

Rheotherm duct meters provide accurate mass flow measurement for air and gas in large pipes and ducts, offering superior sensitivity at low velocities where traditional meters fail.

• Minimal Pressure Drop: The non-intrusive, probe-style design provides an unobstructed flow path, ensuring virtually no pressure loss in your system.
• Simple Installation: Easily installs into existing ducts or large pipes with a single-probe insertion, reducing labor costs and downtime.
• No Moving Parts: Solid-state thermal technology eliminates mechanical wear, clogging, or sticking—even in “dirty” gas applications.
• Standard & Custom Sizes: Available for any duct size or shape, with probe lengths tailored to your specific application requirements. Computational Fluid Dynamic  analysis available upon request.
• Extreme Environment Durability: Options for high-temperature service and Hazardous Location (FM/cFM) certifications for explosive gas environments.
• Direct Mass Flow: Provides accurate readings without the need for separate temperature or pressure compensation.
• Low Velocity Sensitivity: Accurately measures gas flows down to 50 SFPM, making it ideal for leak detection and low-flow process monitoring.
• Proven Quality: Manufactured under an ISO-9001:2015 certified program to ensure long-term reliability in industrial settings.

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
Service	Duct & pipe gases
Pipe Sizes	1” and larger pipes
Wetted Surface	316 SS	Hastelloy C-276®; Monel®
Flow Velocity Limits	25-25,000 SFPM (0.127-127 meter/sec.)	Consult Factory
Turndown Ratio	10:1	Up to 200:1
Accuracy	+/- 1% of reading
Repeatability	+/- 0.5%
Max. Temperature	175 ºF (80 ºC)	Up to 500 ºF (260 ºC)
Max. Pressure	Depends on Fitting	Up to 4,000 PSI
	Standard	Options
Process Connection	1” MNPT	– Tri-Clover (Sanitary); – SS Flange; – Ball valve/hot tap; Most other fittings available
Outputs	4 – 20 mA (flow rate) or Serial Burst with Flow Rate, Totalizer, and Fluid Temperature	– 0 – 10 or 0 – 5 VDC; – Pulse (5 VDC open collector); – HART (4-20 mA); – SPDT relay; – 4 to 20 mA temp
Enclosure	Integrated – NEMA 4X Cast Aluminum Remote – NEMA 4	Remote electronics: – 304 Stainless steel; – NEMA 7 Explosion-proof
	Standard	Options
Display		2 X16 backlit LCD with selectable display of: – Mass/volume flow rate; – Temperature; – Total accumulated flow
Hazardous Environment		Integrated electronics: FM-Approved for: – Class I, Div. 1, Groups B,C,D; – Class I, Zone 1, IIB+H2 (US); – Class II, Div. 1, Groups E, F, G; – Class III, Div. 1 Remote electronics: Same as above except addition of Group A using ISB
Input Power	24 VDC (9 – 36  VDC) (200 mA; 300 mA w/display option)	110/230 VAC ±10V

Probe-type Sensor Flow Capacities for Gases

VELOCITY LIMITS
	feet/min	meter/sec
Maximum	25,000	127
Minimum	25	0.127

Product Brochure	Rheotherm Flow Application Data Sheet (download document)
Rheotherm Method of Operation	Standard Dimensions Insertion Probe Sensor
Rheotherm Model Selection Guide	Rheovec Sensor Head literature