Thermal Mass Flow Meter for Liquid and Gas

Thermal Mass Flowmeter

Thermal Mass Flow Meters have two sensors constructed of reference grade platinum windings (RTDs). The two RTDs are clad in a protective 316SS sheath and are driven by a proprietary sensor drive circuit. One sensor is self-heated (flow sensor), and the other (temperature / reference sensor) measures gas temperature. The pair is referred to as the sensing element, and is either installed in a probe as an Insertion style, or inserted into a pipe section as an In-Line style flow meter. As gas flows by the flow sensor, the gas molecules carry heat away from the surface, and the sensor cools down as it loses energy. The sensor drive circuit replenishes the lost energy by heating the flow sensor until it reaches the desired temperature differential above the reference sensor. The electrical power required to maintain a constant temperature differential is proportional to the gas mass flow rate and is linearized to be the output signal of the meter.

 


Thermal Mass Flowmeter Working Principle


Features

  • Dirt Insensitive

  • No Moving Parts

  • Ease of Installation

  • Negligible pressure drop

  • Wide turndown capability of 100 to 1

  • Economical solution for large diameters

  • Output both flow rate and temperature simultaneously

  • Accurate measurement and operation at very low gas pressures and flow rates

  • Measures mass flow directly - without additional pressure and temperature inputs


Applications

  • Water and Waste Water

  • Compressed Air

  • Natural Gas (Fuel Gases)

  • Metals/ Furnaces/ Smelters

  • Building Automation Contractors

  • Landfill

  • Glass and Fiberglass

  • Food and Beverage

  • Pulp and Paper

  • Pharmaceutical and Biotech

  • Oil and Gas

  • Power

  • Others


Specifications

Technical Details
iSOLV Thermal Mass Flowmeter 30 Series
Type In-line Integral Insertion Integral In-line Remote Insertion Remote
Model FGL30 FGI30 FRL30 FRI30
Sensor Two reference grade platinum RTD clad in 316SS sheath
Wetted Part SS316
Power 24VDC / 115VAC / 230VAC changeable
Power Dissipation <2.5 W
Electronics Microprocessor based Remote-style Microprocessor based
Electronics Enclosure
Integral mount, NEMA 4 enclosure
N/A
Flow Body / Probe
Enclosure
N/A Junction Box is indoor/outdoor enclosure (no electronics)
Transmitter Enclosure N/A Remote mount, NEMA 4 enclosure 
Display High contrast photo-emissive OLED graphical display
(Flow rate, Totalizer, Temperature)
Turn Down 100 to 1
Resolution 1000 to 1
Low End Sensitivity 5 SFPM
Field Calibration Check Yes - Digital system allows raw signal validation (milli-watts)
Communications Optional Modbus®
Approvals Not Available
Field Configurable Please contact Flotech
Flow Accuracy +/- 0.5% of Full Scale +/- 1% of reading
Flow Repeatability 0.20%
Respond Time 1 second
Gas Temperature Range -40°C to 90°C Standard
(for higher temperature options, contact Flotech)
Gas Pressure 500 PSIG (if higher pressure needed, contact Flotech)
Flow Output 4 to 20 mA for Rate; 24VDC pulse for Totalized value
Temperature Output N/A
Ambient Temperature -20°C to 65°C
Flow Body SS316 Schedule 40 Flow Bodies sized from 1/4" x 6" long to 4" x 12" long. Male NPT ends standard (Flanges and other options available) N/A SS316 Schedule 40 Flow Bodies sized from 1/4" x 6" long to 4" x 12" long. Male NPT ends standard (Flanges and other options available) N/A
Probe Style / Length N/A 1/2" OD Probe (3/4" optional) Lengths 6" to 36" N/A 1/2" OD Probe (3/4" optional) Lengths 6" to 36"
Relays Not Available
Cable Length Not Applicable 7.5 m Standard
(max. length 300 m)
Flow Conditioning Flow Conditioners are built in to In-Line Style Flow Bodies from 1/2" to 4" Captive Flow Conditioners available upon request with meter purchase Flow Conditioners are built in to In-Line Style Flow Bodies from 1/2" to 4" Captive Flow Conditioners available upon request with meter purchase
iSOLV Thermal Mass Flowmeter 90 Series - ATEX Approval
Type In-line Integral Insertion Integral In-line Remote Insertion Remote
Model FGL90 FGI90 FRL90 FRI90
Sensor Two reference grade platinum RTD clad in 316SS sheath
Wetted Part SS316
Power 24VDC (115 / 230VAC optional)
Power Dissipation <2.5 W (for 24 VDC models)
Electronics Microprocessor based Remote-style Microprocessor based
Electronics
Enclosure
 
Integral mount, Explosion Proof, Class I, Groups B, C, D, Class II, Groups E,F,G, Class III, Type 4X - Class 1, Zone 1, Groups IIB+H2, IP66
N/A
Flow Body / Probe
Enclosure
N/A Junction Box is Explosion Proof, Class 1, Group B, C, D; Class II Groups E, F, G; Class III, Type 4; Class I, Zone 1, AEX, d IIC, Ex d, IIC, IEC, 60526, IP66
Transmitter Enclosure N/A Remote mount, Explosion Proof, Class I, Groups B, C, D, Class II, Groups E, F, G, Class III, Type 4X - Class 1, Zone 1, Group IIB+H2, IP66 
Display Two line, backlit display with keypad
(Flow Rate, Totalized Flow, Temperature displayed)
Turn Down 100 to 1
Resolution 1000 to 1
Low End Sensitivity 5 SFPM
Field Calibration Check Yes - Digital system allows raw signal validation (milli-watts)
Communications Modbus® compliant RS485 RTU communications
(Optional HART™ communication)
Approvals ATEX Zone I, Ex II 2 G Ex d IIB+H2 T6 Gb
Field Configurable Please contact Flotech
Flow Accuracy +/- 0.5% of Full Scale +/- 1% of reading
Flow Repeatability 0.20%
Respond Time 1 second
Gas Temperature Range -40°C to 90°C Standard
(for higher temperature options, contact Flotech)
Gas Pressure 500 PSIG (if higher pressure needed, contact Flotech)
Flow Output 4 to 20 mA for Rate; 24VDC pulse for Totalized value
Temperature Output Through Modbus® only
Ambient Temperature -20°C to 65°C
Flow Body SS316 Schedule 40 Flow Bodies sized from 1/4" x 6" long to 4" x 12" long. Male NPT ends standard (Flanges and other options available) N/A SS316 Schedule 40 Flow Bodies sized from 1/4" x 6" long to 4" x 12" long. Male NPT ends standard (Flanges and other options available) N/A
Probe Style / Length N/A 1/2" OD Probe Lengths 6" to 36" N/A 1/2" OD Probe  Lengths 6" to 36"
Relays Not Available
Cable Length Not Applicable 7.5 m Standard
(max. length 300 m)
Flow Conditioning Flow Conditioners are built in to In-Line Style Flow Bodies from 1/2" to 4" Captive Flow Conditioners available upon request with meter purchase Flow Conditioners are built in to In-Line Style Flow Bodies from 1/2" to 4" Captive Flow Conditioners available upon request with meter purchase
Note: Specifications are subject to change without notice

Enquiry

For all inquiries, you may contact us through Telephone, Email or Live Chat Support.

Operating Hours

Monday to Friday: 8.00am to 5.30pm

Technical Support (After Office Hours)

Tel: (65) 9876 6258

Contact Information

By Phone / FaxBy Email
Tel: (65) 6553 0366
Fax: (65) 6553 0828
info@flotech.com.sg

Flotech Approvals