Flow Sensor for Compressed Air and Gases


The EE771 is a thermal flow sensor for compressed air and gases. Irrespective of pressure and temperature, the EE771 flow meter registers mass flow, volumetric flow or standard flow.

EE771 mass flow sensor

EE771 mass flow sensor with remote sensor probe

EE771 mass flow sensor with measurement ball valve mounting

The flow sensor can measure the consumption of compressed air, nitrogen, oxygen, CO₂, argon or other non-corrosive gases. The measurement ball valve permits easy installation and removal with only a short interruption of the flow.

EE771 flow sensor employs the well proven E+E hot-film sensor element with high immunity to contamination, which leads to outstanding long-term stability and accuracy even under harsh operating conditions.

With wide measuring range from 0.5 to 200 Nm/s (100…39370 SFPM) (1:400) and fast response time, one and the same flow meter model can be employed throughout the entire gas supply system. It records accurately even the smallest flow which represent an essential prerequisite for calculating consumption costs or for finding leaks.

Every E+E flow sensor undergoes a precise factory calibration procedure at a pressure of 7 bar (102 psi), the corresponding calibration certificate is included in the standard scope of supply.

The EE771 flow sensor is available with an additional MODBUS RTU or M-BUS (Meter-Bus) interface.

Key Features

  • Measurement ball valve for rapid installation and removal with only a short flow interruption
  • Remote, interchangeable probe for easy mounting
  • Pipe diameter DN15 – DN50 (1/2″ – 2″)
  • Pressure range up to 16 bar (232 psi) PN16
  • Wide measuring range up to 200 Nm/s (39370 SFPM)
  • Bus interface for MODBUS RTU or M-BUS

Technical Data

Measured values
standardized volumetric flow, mass flow, standardised flow, temperature, consumption
Measuring range
0.5 - 200 Nm/s (100…39370 SFPM)
±1.5 % of the measured value
Pipe diameter
DN15 up to DN50 (1/2" - 2")
0-10 V, 0/4-20 mA, Pulse, Switch, Modbus RTU or M-Bus
18 - 30 V DC

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