Application for Rheotherm and RheoVac Instruments

Instruments for Hazardous Locations

Model 210 Flow Meters for Hazardous LocationsBionetics offers a line of flow meters and switches in a variety of configurations to meet the most demanding industry needs. Rheotherm instruments are commonly installed in hazardous (classified) areas through Factory Mutual (FM) approved integrated designs, FM-approved intrinsically safe barriers (ISB) to isolate the flow sensors, NEMA 7 enclosures, and purged enclosures.

Flow Meters for Hazardous Locations

The Model 210 Flow Meter is available with an FM-approved explosion-proof design for use in measuring both liquids and gases. In this configuration, the flow sensor is integrated with the flow meter electronics. The Rheotherm sensor is designed for operation in hazardous environments and the electronics is supplied in an explosion-proof NEMA 4X enclosure. The unit is available with or without an integrated LCD display and in both insertion probe and inline sensor configurations.

Model 210 Flow Meters with ISBRheotherm Flow Meters for hazardous locations are also available in a remote electronics configuration where the electronics can be remotely located from the sensor by up to 200 feet. The sensor is connected to the electronics through an ISB which provides the necessary isolation of the electrical components. It is also available with or without an LCD display and with both insertion probe and inline sensors. This configuration is often required where space is limited or when instrument options such as AC power and certain other types of outputs are desired.

Flow Switches for Hazardous Locations

Rheotherm Flow Switches can also be installed in hazardous areas using Bionetics’ proprietary, FM-approved intrinsically safe barrier. The sensor of the Model 100FS Flow Switch is installed in the hazardous location with the electronics and the ISB located either in a non-hazardous remote area, or within the hazardous area if installed in a NEMA 7 explosion-proof housing. A purged enclosure may also be used in areas which require 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
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

Need Additional Information?
If you have additional questions regarding the use of Bionetics systems in hazardous locations, use the form on this page to submit your questions, or visit our contact us page for telephone, fax and email information.

pdf (1) Options for Hazardous Locations (US & CA)
pdf (1) FM Approval Documents for Model 210


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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