THERMAL MASS

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  FLOW METER
Flow Meter
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Thermal Mass Flowmeter

Thermal Mass Flowmeters - The rate of heat absorbed by a flow stream is directly proportional to its mass flow. As molecules of a moving gas come into contact with a heat source, they absorb heat and thereby cool the source. At increased flow rates, more molecules come into contact with the heat source, absorbing even more heat. The amount of heat dissipated from the heat source in this manner is proportional to the number of molecules of a particular gas (its mass), the thermal characteristics of the gas, and its flow characteristics.
Featured Thermal Mass Flowmeter Suppliers
Sierra Instruments, Inc.
We designed our Heavy-Industrial Thermal mass flow meter products for the most demanding industrial gas mass flow measurement applications. Featuring heavy-duty 316 stainless steel wetted materials, no moving parts and digital signal processing, our Heavy-Industrial Thermal line is the answer for the roughest industrial environments. Our Model 640S Steel-Trak™ is an insertion probe design and our Model 780S Flat-Trak™ is an inline design featuring an integrated dual-plate flow conditioning element (Flow=Trak™) that allows the instrument to maintain top performance in heavily constrained piping environments where long-straight pipe runs simply do not exist. Our Model 780S-UHP is an inline flow conditioned design for gas distribution in ultra clean processes. All models feature DIRECT mass flow measurement and Sierra’s Smart Electronics Package for field-rangability, flow-range adjustment, and meter validation and diagnostics.
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Sierra's Heavy-Industrial Thermal Mass Flow Meter Family
Brooks Instrument

Brooks offers three series of mass flow controllers / mass flow meters for applications requiring high leak integrity and/or ultra-high purity (UHP). These devices are designed with a 1.125” wide profile providing an efficient, space-saving footprint.
The GF Series is our newest addition to this product line. GF Series is a robust upgrade for standard high purity (HP) mass flow controllers, offering improved accuracy and cleanliness. Optional electrical adapters ensure drop in compatibility with older style analog flow controllers. Brooks’ new sensor technology with improved signal to noise performance and powerful control algorithms deliver enhanced measurement accuracy and reproducibility for optimal gas chemistry control. 
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mass flow meters
Bronkhorst High-Tech
Bronkhorst High-Tech B.V., established in 1981, offers the most extensive product range of thermal mass flow meters and controllers on the market. Numerous styles of both standard and bespoke instruments can be offered for applications in laboratory, industrial and hazardous areas.
The full scale measuring range (with 50:1 turn-down) for these instruments can be selected between 0-1 mln/min and 0-10000 m3n/h for gases and 0-30 mg/h up to 0-20 kg/h for liquids.

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Thermal mass flowmeter
Vögtlin Instruments
Vögtlin Instruments AG offers high-quality devices and solutions for your flow measurement and control tasks: Reliable & precise mass flow meters & controllers for gases (Accuracy +/- 0,3% of full scale and +/- 0,5% of reading, turndown ratio 1 : 100) – Modular & customizable variable area flowmeters for liquids and gases – High precision needle valves for fine dosages. Profit from our many years of experience as developers, manufacturers and service partners.
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Vögtlin Instruments : MASS FLOW METERS 'RED-Y COMPACT SERIES'
Aalborg Instruments & Controls, Inc.
Aalborg Instruments & Controls, Inc.
The flow rate can be displayed in 23 different volumetric flow or mass flow engineering units including user specific. Flow meters can be programmed remotely via RS-232/RS-485 or optional Profibus DP interface.XFM flow meters support various functions including: programmable flow totalizer, high and low flow alarm, automatic zero adjustment, 2 relay outputs, jumper selectable 0-5 Vdc or 4-20 mA analog outputs, status LED diagnostic, capable to store calibration for up to 10 different gases, internal or user-specific K-factors. Optional local 2 x 16 characters LCD display* with adjustable back light provides Flow, Total and diagnostic reading simultaneously. Click Here for More»
AALBORG: XFM digital mass flow meter
Thermal Mass Flowmeter

Mass Flow ONLINE B.V. is your online shop for high quality flow meters. With our high stock levels, we despatch your order in two days worldwide.
We sell: Mass flow meters and regulators [0.02 - 200 ln/min / SLM], Vortex gas meters [ 7.2 - 850 l/min / LPM],  Liquid flow meters (several technologies: vortex, elektromagnetic and ultrasonic) [0.4 - 200 l/min / LPM] and Fuel flow meters (diesel, oil, petrol) [1 - 400 l/h / LPH]. Shop with confidence because we offer:

• High quality products with clear competitive pricing • Protection, your online purchase information is protected using high-grade SSL encryption and a daily security check of our site by security experts
• Easy product selection and ordering with order tracking • Privacy, we treat your private information as if it were our own and we do not share or sell it with third parties
• Guaranteed delivery to arrive as ordered and undamaged • Trust, we are a trustworthy company, authenticated and verified by Verisigns’ accountants
• Shipment in two business days  
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Mass Flow ONLINE : ‘MASS-VIEW' MASS FLOW METERS WITH OLED DISPLAY
Featured Thermal Mass Flowmeter Products
Sierra: Model 780S Flat-Trak™ Inline Mass Flow Meter with Flow Conditioning
Model 780S Flat-Trak™ Inline Mass Flow Meter with Flow Conditioning
  • 316SS construction
  • Range of process connections
  • Field Validation/Configuration
  • 2% reading accuracy
  • Very large installed base
  • Removable probe for recal/service
  • In-line flow conditioning
  • Meters all process gases

The Model 780S Flat-Trak™ offers improved measurement capabilities in installations where long straight pipe runs are not available. The meter incorporates Sierra’s unique dual-plate flow conditioning element to eliminate velocity profile distortions as well as swirl and temperature stratification in the gas stream. This product reduces piping straight run requirements to as little as three upstream diameters. As a result, you save money on installation costs when compared to an orifice-plate where at least 20 upstream piping diameters are required for optimal performance.

The Model 780S is available in pipe sizes from 1/4-inch to 8-inches in a choice of NPT, Buttweld or ANSI 150 lb. flanged design (300 lb. flanges optional). Larger sizes are available upon request. This meter features Sierra's well-known Smart Electronics Package for field-rangability, field flow-range adjustment, and field validation and diagnostics. The Model 780S has outstanding low-velocity sensitivity and exceptional accuracy.

The Model 780S is hazardous area approved for FM, CSA, EEx, PED, CE, CENELEC and is also available with a NEMA 4X (IP65) enclosure. Product accuracy is ±2% of reading, 0.2% of full scale repeatability.

Brooks: Digital Mass Flow Meters & Controllers
Digital Mass Flow Meters & Controllers

High Performance Flow Control
The Brooks Instrument GF100 is a robust upgrade for standard high purity (HP) mass flow controllers, offering improved accuracy and cleanliness. Optional electrical adapters ensure drop in compatibility with older style analog flow controllers. Brooks’ new sensor technology with improved signal to noise performance and powerful control algorithms deliver enhanced measurement accuracy and reproducibility for optimal gas chemistry control.
The GF100 is designed for long-term reliability with embedded diagnostics and automated zeroing to reduce maintenance for a lower cost of ownership.

  • High purity construction with reduced surface area and removal of unswept volumes for faster dry-down during purge
  • Surface passivated high purity wetted flow path
  • 10 μ inch Ra surface finish
  • Independent service and diagnostic port for on-tool troubleshooting and process fingerprinting and optimization
  • Integrated high visibility LCD display reports flow (%) and temperature (°C)
  • Analog and Serial (RS-485), analog 0–5 VDC and DeviceNet™ communication interfaces

Bronkhorst: IN-FLOW IP65 Mass Flow Meters
Bronkhorst: IN-FLOW IP65 Mass Flow Meters

IN-FLOW Select Series Mass Flow Meters/Controllers are thermal, bypass-type, mass flow meters of modular construction with a 'industrial style' pc-board housing. Control valves can either be integrally or separately mounted, to measure and control gas flows from: lowest range 0,014 ... 0,7 mln/min up to highest range 8 ... 1670 ln/min The control valve design distinguishes itself from competitive designs in its truly modular construction and it can be field replaced or changed by the user without any adjustment. The standard valve is normally closed and is available up to Kv-values of 6.0. Normally opened valves can also be supplied.

  • High accuracy (standard 0,5% of Rd plus 0,1% of FS)
  • Rangeability in digital mode up to 187,5 : 1
  • Optional Multi-Gas / Multi-Range functionality: freely programmable ranges and gas types
  • Pressure rating 64 /100 bar (Multi-Gas / Multi-Range functionality up to 10 bar)
  • High pressure versions available (up to 700 bar)
  • Rugged, weatherproof housing (IP65, dust and waterproof)
  • Option: ATEX approval for Zone 2
  • Analog or digital communication (RS232 or fieldbus interface)
  • High flow versions available (up to 11000 m3n/h)

AALBORG: XFM digital mass flow meter
AALBORG: XFM digital mass flow meter
  • Supports up to 23 Engineering Units (including User Defined).
  • Stores calibration data for up to 10 gases.
  • Programmable Totalizer indicates total gas quantity.
  • High and low gas flow Alarm limits with preset delay interval.
  • Two sets of user-programmable electromechanical SPDT relays with latch option.
  • User-selectable analog 0-5 Vdc or 4-20mA outputs.
  • Internal Conversion factors for up to 32 gases.
  • Digital Interface (RS-232 / RS-485, Profibus DP available).
  • Multi-Drop Capability of up to 256 units (RS-485 option).
  • Optional Profibus DP interface with I&M functionality.
  • Automatic sensor zero offset adjustment (via digital interface or local push button).
  • Self-Diagnostic Tests.
  • Local 2 x 16 characters LCD display* with adjustable back light (optional).

Vögtlin Instruments : MASS FLOW METERS 'RED-Y COMPACT SERIES'
Vögtlin Instruments : MASS FLOW METERS 'RED-Y COMPACT SERIES'
  • First mass flow meter with battery power
  • At least two years of autonomy
  • CMOS sensor technology
  • On-the-spot direct reading, including bar graph
  • Extremely compact unit
  • Insensitive to pressure and temperature changes
  • High accuracy and turndown ratio
  • No moving parts
  • Resistant to pressure bumps
  • No restriction on installation position
  • No inlet section required
  • Optional 24 Vdc supply, manual valve & switch
  • 3-year warranty

Mass Flow ONLINE : ‘MASS-VIEW' MASS FLOW METERS WITH OLED DISPLAY
Mass Flow ONLINE : ‘MASS-VIEW' MASS FLOW METERS WITH OLED DISPLAY

This Multi Gas / Multi Range instrument has the following features

  • Clear indication in:
    • actual flow rate (bar graph and value)
    • desired flow units (59 units selectable)
    • type of gas (standard 10 pre-installed)
    • totalized flow (in several units)
    • Bright, wide-angle OLED display
  • Low pressure drop
  • Virtually independent of pressure and temperature variations
  • High accuracy and turndown ratio (1:100)
  • No moving parts in the flow channel
  • High and low alarm settings with programmable delay with 2 integrated relays
  • Batch counter function
  • Analog (0..5 Vdc) and digital communication (Modbus-RTU, RS-232 interface)
  • Configurable password protection
  • 10 pre-installed gases (Air N2 O2 CO Ar CO2 CH4 C3H8 C4H10 N2O) available or He or H2
  • 4 selectable ranges (100%, 50%, 25% and 10% of maximum fullscale range)
  • Digitally calibrated
  • Zero offset adjustment per gas
  • Installable in any position (flipscreen function available)
  • 3 years warranty

The Thermal Mass flow meters has many uses and probably too many to be listed on Flow Meter Directory. From applications which involve detecting leaks in compressed air flow systems to natural gas systems billing and demand control. In a natural gas line the thermal mass flow meter can also be applied to “leak checking” applications downstream of a shut off valve. In these cases it is practical to use a non custody transfer type meter . Specialty Gas is a huge industry which requires accurate mass flow meters but also at an affordable price. Applications might include for example the need for a reliable nitrogen , argon  or Hydrogen flow meter.  In the case of hazardous gas, the manufacturers have certain models which are approved for use in certain gas groups.

The industry is also adopting the thermal mass meter into stack gas flow applications and even digester flow regimes which require the thermal mass meter to measure methane mixtures. One of the components in that kind of flow measurement is carbon dioxide and the metering is necessary for those involved in Biogas with concerns of meeting government mandates requiring emission monitoring and so the thermal mass flow meter may be a key element in a design following environmental engineering standards .

The thermal mass flowmeter is also very useful to those in the incineration business or some form of combustion control. Whatever control system is being implemented, there are large volumes or mass of gas involved – these could involve the need for a thermal type natural gas flow meter, oxygen flowmeter or general air flow control for optimization of the plant combustion processes where ratio control is critical to profitability levels and avoidance of energy wastage. Coming back to the ability of the thermal mass flow meter to measure methane /carbon dioxide mixes – this is going to be an excellent choice for applications that have to deal with land fill gas.

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