Flow Measurement Instruments
- Flow Meter Calibration Services
- Rheotherm Flow Instruments – Model 210R
- Rheotherm Flow Instruments – Model 210
- Low Flow Liquid Flowmeters — Thermal Mass Measurement from 1 Gallon/Year
- Space-Qualified Flow Meter Electronics
- Thermal Mass Low Flow Gas Meters
- Thermal Duct Flow Meters for Air & Gas
- MaxExtractor Extraction Monitor
- Multi-Variable Process Meter
- Bidirectional Flow Meters
- RheoVac ® Multisensor Flow Monitors
- Flow Switches
- Flow Meters & Switches for Hazardous Locations
- In-Stock Rheotherm Instruments
- Custom Process Measurement
- Electronics Options
- Low Flow Controller
Flow Meters & Switches for Hazardous Locations
Bionetics Rheotherm flow meters and switches are designed and FM-certified for use in explosive, flammable, and corrosive atmospheres. Available in both explosion-proof and intrinsically safe configurations, they meet Class I Division 1 and Division 2 requirements straight out of the box.
For Class I Div. 1 installations specifically, Rheotherm instruments can be deployed using four proven approaches: FM-approved integrated explosion-proof designs, FM-approved intrinsically safe barriers (ISB) that isolate the sensor from the electronics, NEMA 7 explosion-proof enclosures, and purged enclosures for areas requiring the highest level of protection.
Explosion-Proof Flow Meters — FM Approved
The Rheotherm Model 210 Flow Meter is available in an FM-approved explosion-proof configuration for measuring liquids and gases in hazardous areas. Key features include:
- Explosion-proof NEMA 4X electronics enclosure
- FM and cFM approved for Class I, Division 1, Groups B, C, D
- Available as inline sensor or insertion probe
- Optional integrated LCD display showing flow rate, temperature, and totalized flow
- Self-diagnostic capability for continuous performance monitoring
Where space is limited or remote mounting is preferred, the Model 210 is also available in a remote electronics configuration. The sensor can be located up to 200 feet from the electronics, connected via an ISB isolation barrier — ideal when AC power or specific output types are required, or when electronics need to be housed outside the hazardous zone.
Intrinsically Safe Flow Meters — Remote Electronics Configuration
For applications requiring intrinsically safe operation, Rheotherm flow meters are available with a remote electronics configuration using Bionetics’ proprietary FM-approved intrinsically safe barrier (ISB). This isolates the electrical components from the hazardous zone, allowing the sensor to operate safely in explosive atmospheres while the electronics are housed remotely — in a non-hazardous area or in an explosion-proof NEMA 7 enclosure within the hazardous zone.
Flow Switches for Hazardous Locations
The Rheotherm Model 100FS Flow Switch is certified for installation in hazardous areas using Bionetics’ FM-approved intrinsically safe barrier. Configuration options include:
- Sensor installed in the hazardous location with electronics remotely sited in a safe area
- Electronics housed in a NEMA 7 explosion-proof enclosure within the hazardous zone
- Purged enclosure option available for areas requiring maximum explosion protection
Area Classifications for Rheotherm Instruments
FM – For US and Canada
| Model 210 Flow Meters | ||
| Integrated Electronics ▪ 210-X (no display) ▪ 210-XDT (local display) | Explosion proof | Class I, Division 1, Groups B, C, and D Class II, Division 1, Groups E, F, and G Class III, Division 1 |
| Remote Electronics ▪ 210R-I-ISB (no display) ▪ 210R-IDT-ISB (local display) | Intrinsically safe* | Same as above, except Group A is included |
| Model 100FS Flow Switches (US Only) | ||
| Remote Electronics ▪ 100FS-I-ISB | Intrinsically safe* | Class I, Division 1, Groups A, B, C, and D Class II, Division 1, Groups E, F, and G Class III, Division 1 |
* Remote electronics supplied in NEMA 4 enclosure with Intrinsic Safety Barrier which must be located outside of hazardous area. Optional NEMA 7 enclosure available for electronics location within hazardous area
Industries We Serve
Rheotherm hazardous location instruments are used across industries where flammable, explosive, or toxic gases and liquids are present, including:
- Oil and gas production — flare gas monitoring, wellhead injection
- Chemical and petrochemical processing
- Pharmaceutical manufacturing — flammable solvent handling
- Ethanol production and distillation
- Coal mining — methane monitoring and ventilation
- Battery rooms — hydrogen gas ventilation monitoring
- Wastewater treatment — digester and biogas measurement
Request a Quote for Hazardous Location Flow Meters
Not sure which configuration is right for your application? Our flow application specialists can help you select the correct approval class, enclosure type, and sensor configuration for your specific environment. Contact us today or submit a Request for Quote and we’ll respond promptly.
Hazardous Environment Standards
Applicable to Bionetics Flow Meters and Switches
FM and ANSI – For US
| Model 210 Flow Meters and Model 100FS Flow Switches | |
| Title | Standard Number |
| Electrical Equipment for Use in Hazardous (Classified) Locations – General Requirements | FM Class 3600:2011 |
| Intrinsically Safe Apparatus and Associated Apparatus for Use in Class I, II & III, Division I, Hazardous (Classified) Locations | FM Class 3610:2010 |
| Explosion Proof Electrical Equipment General Requirements | FM Class 3615:2006 |
| Electrical Equipment for Measurement, Control and Laboratory Use | FM Class 3810:2005 |
| Enclosures For Electrical Equipment (1000 Volts Maximum) | ANSI/NEMA-250:2014 |
CSA – For Canada
| Model 210 Flow Meters | |
| Title | Standard Number |
| Bonding and Grounding of Electrical Equipment (Protective Grounding) | CSA-C22.2 No. 0.4:1982 |
| Threaded Conduit Entries | CSA-C22.2 No. 0.5:1982 |
| Enclosures for Use in Class II Groups E, F, and G Hazardous Locations | CSA-C22.2 No. 25:1966 |
| Explosion-Proof Enclosures for Use in Class I Hazardous Locations | CSA-C22.2 No. 30:1988 |
| Special Purpose Enclosures; Industrial Products | CSA-C22.2 No. 94:1991 |
| Process Control Equipment | CSA-C22.2 No. 142:1990 |
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