Low Flow Liquid Meters (RFQ)

Precision Low-Flow Measurement Solutions

Rheotherm thermal flow meters provide repeatable, maintenance-free measurement for the most challenging low-flow liquid applications.

• Extreme Low-Flow Range: Measures from 1 gallon/year up to several GPM.
• Maintenance-Free Design: Unobstructed flow path with no moving parts to wear, stick, or break.
• Media Versatility: Accurately measures low or high-viscosity liquids, slurries, liquefied gases, and corrosive chemicals (e.g., Acids, NaOCl, NaOH).
• Built for Extremes: Options for Hazardous Locations (Intrinsically Safe/Explosion-Proof) and compatibility with most fluids via various tube materials.
• High Turndown: Typical 10:1 range, with custom options up to 200:1.
• Smart Diagnostics: Includes self-diagnostics and optional LCD display for flow rate, temperature, and totals.
• Proven Quality: Manufactured by Bionetics since 1978 under an ISO-9001:2015 certified 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 send it to sales-flow@bionetics.com.

You can also 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)	-20 – 350°F (-30 – 175°C)
Pressure	0 – 1,000 PSI	Up to 30,000 PSI
Calibration Ranges	– 10:1 Turndown – 0.007 cc/min to 20 GPM	– Up to 200:1 turndown; – Four calibration channels available (for multiple flow ranges or fluids using the same sensor)
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 (flow range dependent)	Capillary; 1/16”; 1/8”; 3/16”; 1/4”; 3/8”; 1/2”: 5/8”; 3/4”; 1”	Other sizes via fittings/adapters
Process Connection	Plain tube stubs suitable for compression fittings	– 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
Display		2 X16 backlit LCD with selectable display of: – Mass/volume flow rate – temperature – total accumulated flow
	Standard	Options
Enclosure	Sensor: PVC Integrated Electronics:  NEMA 4X Cast Aluminum Remote Electronics: NEMA 4	Sensor: Stainless steel Remote electronics: – Stainless steel – NEMA 7 Explosion-proof
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
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
Input Power	24 VDC ±4V (200 mA – blind unit; 300 mA w/display option)	110/230 VAC ±10V

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

Product Brochure	Rheotherm Flow Application Data Sheet (download document)
Rheotherm Method of Operation	Rheotherm Sensor Selection Guide
Rheotherm Model Selection Guide	Standard Dimensions Inline (TU/TUL) Sensor
	Rheotherm Model 210 Product Manual