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General Purpose Flowmeters

    Thermal Mass Flow Meters Designed for Gas Flow Measurement

    Whether measuring gas flows in a laboratory or manufacturing setting, TSI thermal mass flow meters provide accurate results with multiple data output options. TSI flow meters incorporate a proprietary platinum film sensor designed for measuring gas flows. This enables their use in applications that demand fast response and high accuracy over a wide flow range.

    Our flow meters have turn-down ratios greater than 1000:1, due to our thermal flow sensing technology and extensive gas calibration process. The TSI 4000 Series was designed for ultra-low pressure loss to minimize minimize flow circuit back pressure and its impact on the system.

    TSI air mass flow sensors are specified as 2% of reading. One TSI mass flow sensor covers the same range as 3% (or more) full scale devices, with better accuracy at most points.

    The four millisecond response time of the TSI mass air and gas mass sensor is ideal for closed-loop control systems and integrated volume measurements, and it ensures accuracy in fluctuation flows. 

    Features and Benefits

    • Accuracy of two percent of reading (not full scale)
    • High turndown ratio
    • Multi-gas, user-selectable
    • 4 ms response to changes in flow
    • Ultra-low pressure drop
    • RS 232 interface for digital outputs and configurable device options
    • Voltage output of flow rate
    • Measure flow rate, temperature, and pressure (display unit only) in one instrument
    • Temperature and pressure compensation are built-in
    • Calibration certificate is NIST-traceable and included with purchase

    Choosing the right mass flow meter for your application

    Flow Meter Model Mass Flow Meter 40401 Mass Flow Meter 4040 Mass Flow Meter 4043 Mass Flow Meter 4045 Mass Flow Meter 41401 Mass Flow Meter 4140 Mass Flow Meter 4143 Mass Flow Meter 41403 Mass Flow Meter 41433
    Medical Design / R&D Applications x x x x x x
    Industrial Applications x x x x x x x
    Calibrated for Air Air Air Air Air Air Air Air Air Air
    Calibrated for Oxygen O2 O2 O2 O2 O2 O2 O2 O2
    Calibrated for Nitrogen N2 N2 N2 N2 N2 N2 N2
    Calibrated for Nitrous Oxide N2O N2O N2O
    Connection tube size 22mm ISO 22mm ISO 1/2" 3/4" 1/4" 1/4" 3/8" 1/4" 3/8"
    Range L/min 0-300 0-300 0-200 0-300 0.01-20 0.01-20 0.01-20 0.01-20 0.01-20


    • Laboratory
    • R&D
    • Product development
    • Quality assurance
    • Product testing
    • Metrology
    • Medical and hospital
    • Environmental
    • OEM




    Purchase any one of our general purpose flowmeters with the guarantee that you can return it for a full refund if not entirely happy with its performance.

    Need Help Finding a Flow Meter Product?

    1. 1 What gas type are you trying to measure?
    2. 2 What flow range are you looking for?
    3. 3 What is the end configuration you need?
    4. 4 Do you want to display the values?
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