Endress+Hauser Proline t-mass 65I Thermal mass flowmeter

Endress+Hauser Proline t-mass 65I Thermal mass flowmeter

You are currently viewing Endress+Hauser Proline t-mass 65I Thermal mass flowmeter

High performing flowmeter with intelligent and dynamic adaptation to changing process conditions

The t-mass 65I was designed for the direct mass flow measurement of industrial gases and compressed air. With a turndown of typically 100:1 it can measure accurately operational flow rates and off line leakage. The integrated gas engine allows the customer to configure the device for 20 freely selectable gases. The t-mass 65I insertion version is suitable for large pipelines or rectangular ventilation ducts.


  • Measurement of gases and gas mixtures in circular piping or rectangular ducts
  • Highest performance – 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
  • Fast and efficient commissioning – guided operating menus
  • High plant availability – self-diagnostics and error monitoring
  • Automatic recovery of data for servicing

Field of application

  • Measuring principle is characterized by a high operable flow range and direct mass flow measurement
  • Measurement of gases and gas mixtures in circular piping or rectangular ducts.

Device properties

  • 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.)
  • Device in compact or remote version
  • 4-20 mA HART, PROFIBUS PA/DP, Modbus RS485, FF
  • Worldwide approvals (Hazardous area)
Measuring PrincipleThermal
Product headlineMass flowmeter for measurement of standard single / mixture gas applications; insertion style
Sensor featuresS-DAT, T-DAT
Quick Set-Up
Dynamic temperature compensation
20 selectable gases
Programmable gas mixture

External pressure input
2 Totalizers
For circular pipe or rectangular duct
Nominal diameter rangeDN 80…1500
Max. measured errorMass: +-1.5%
Measuring rangeGas and process condition dependent
Max. process pressure-0.5… 20 barg
-7.25… 290 psig
Medium temperature range-40… +130°C
-40… +266°F
Degree of protectionIP 67
Display/OperationTwo line backlit LCD, alphanumeric (16 characters)
Push buttons
Outputs2 x 0/4…20mA
Pulse/Frequency (1KHz, active/passive)
2 x Relays Status
Digital communicationHART
Hazardous area approvalsATEX

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