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Picture of thermal mass flowmeter Proline t-mass 65I insertion for industrial gases & compressed air

t-mass 65I

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  • Measuring principle


  • Product headline

    High-performing flowmeter with intelligent and dynamic adaptation to changing process conditions.
    Measurement of gases and gas mixtures in circular piping or rectangular ducts.

  • Sensor features

    Plant safety – high accuracy and repeatability for a wide range of utility and process gases. Cost-effective measurement – easy installation, negligible pressure loss and maintenance-free. Reliable flow trending – multivariable measurement.
    Insertion version for nominal diameter DN 80 to 1500 (3 to 60"). Medium temperature up to +130 °C (266 °F). High accuracy: ±1.5 % o.r. (10 to 100 % o.f.s.).

  • Transmitter features

    Flexible device configuration to suit the application – integrated "Gas Engine" functionality. For demanding applications – user-definable gas mixtures, high repeatability and accuracy. Automatic recovery of data for servicing.
    Device as compact or remote version. 4-20 mA HART, PROFIBUS PA/DP, Modbus RS485, FF. Worldwide approvals (Hazardous areas).

  • Nominal diameter range

    DN 80 to 1500 (3 to 60")

  • Wetted materials

    Transducer: 1.4404 (316L); Alloy C22, 2.4602 (UNS N06022)
    Insertion tube: 1.4404 (316/316L); Alloy C22, 2.4602 (on request)
    Transducer guard: 1.4404 (316L)
    Compression fitting: 1.4404 (316/316L)
    Ferrules: PEEK 450G, PVDF
    Bonded seals: EPDM, Kalrez 6375, Nitrile and 316/316L

  • Measured variables

    Mass flow, temperature, volume flow, energy flow

  • Max. measurement error

    Gas: 1.5% o.r. (10 to 100% o.f.s.), 0.15% o.f.s. (1 to 10% o.f.s.)

  • Measuring range

    20 to 720000 kg/h (44 to 1587328 lb/h)

  • Max. process pressure

    -0.5 to 20 bar gauge (-7.25 to 290 psi gauge)

  • Medium temperature range

    -40 °C to +130 °C (-40 °F to +266 °F)

  • Ambient temperature range

    -20 °C to +60 °C (-4 °F to +140 °F)
    Optional: -40 °C to +60 °C (-40 °F to +140 °F)

  • Transmitter housing material

    Transmitter housing:
    Compact: powder coated die-cast aluminium
    Wall-mount: powder coated die-cast aluminium
    Remote field: powder coated die-cast aluminium
    Connection housing (remote version): powder coated die-cast aluminium

  • Degree of protection

    IP67 (NEMA 4X) for transmitter and sensor

  • Display/Operation

    Liquid crystal: back-lit, two lines with 16 characters per line
    Configuration via local display and operating tools possible

  • Outputs

    4-20mA HART (active/passive selectable), pulse, frequency, status

  • Inputs

    4-20mA, status input

  • Digital communication

    Profibus DP, Profibus PA, Foundation Fieldbus, Modbus

  • Power supply

    85 to 260 VAC, 45 to 65 Hz
    20 to 55 VAC, 45 to 65 Hz
    16 to 62 VDC

  • Hazardous area approvals


  • Product safety

    CE, C-Tick, EAC marking