Modular, Compact In-line Flow Meter for DN15 to DN50


The EE741 in-line flow meter can be easily adapted for any measuring task. It is dedicated for accurate metering and monitoring of compressed air and technical gases in DN 15 to DN50 pipes.

EE741 mass flow meter for air and gases with display

EE741 can be used for DN15 / DN20 / DN25 pipes

EE741 can be used for DN15 / DN50 pipes

EE741-N50 can be used for DN32 / DN40 / DN50 pipes

EE741-N50 gauge mounting block

EE741-N50 with gauge mounting block with flanges

The thermal measuring principle and the well proven E+E hot film sensor element lead to best long-term stability and fast response time.

Outstanding measuring accuracy, even in the lower measuring range, is achieved by an application-specific multi-point factory adjustment performed at 7 bar (102 psi). This allows reliable leak detection and corresponding energy savings. The construction of the EE741 flow meter is optimised for easy installation and maintenance.

Modular design

One and the same transmitter can be used for each of three pipe diameters:

  • EE741: DN15 (1/2″) / DN20 (3/4″) / DN25 (1″)
  • EE741-N50: DN32 (1-1/4″) / DN40 (1-1/2″) / DN50 (2″)

The pipe diameter is easily set via the display menu or the EE-PCS product configuration software.

Once the gauge mounting block is installed in the pipeline, the transmitter can be installed and removed without any pipework. As a result, the EE741 flow meter is also ideal for temporary measurement at several installed mounting blocks. The sealing plug included in the scope of supply enable the normal operation of the compressed air system when the transmitter is removed.

Display (optional)

The state-of-the-art LCD shows the current measured values and the overall consumption. The EE741 setup can be easily performed with the push buttons and intuitive menu guidance. The display can be rotated in 90° increments with a push button for convenient orientation in any mounting position of the flow meter.

Typical Applications


  • Compressed air consumption measurement
  • Monitoring of technical gases O2, N2, Ar, CO₂. Other gases upon request
  • Nitrogen generators
  • Leak detection

Key Features

  • Modular design
  • Removal without dissasembling the pipework
  • Application-specific adjustment under pressure
  • Exceptional price/performance ratio
  • Analogue, pluse and switching output
  • Modbus RTU and M-Bus
  • Integrated consumption meter


  • Standard volume flow [Nm3/h, Nm3/min, l/min, l/s, SCFM]
  • Mass flow [kg/h, kg/min]
  • Standard flow [Nm/s, SFPM]
  • Temperature [°C, °F]
  • Integrated consumption meter (totalisator) for cost-effective consumption analysis without additional data logger

Technical Data

Measured values
standardized volumetric flow, mass flow, standardised flow, temperature, consumption
Pipe diameter
DN15 / DN20 / DN25
DN32 / DN40 / DN50
Measuring range - flow
DN15: 0.2 - 76.3 Nm³/h (0.12 - 44.88 SCFM)
DN20: 0.4 - 135.6 Nm³/h (0.24 - 79.77 SCFM)
DN25: 0.6 - 212 Nm³/h (0.36 - 124.71 SCFM)
Measuring range - flow
DN32: 0.9 - 347.4 Nm³/h (0.52 - 202.06 SCFM)
DN40: 1.4 - 542.8 Nm³/h (0.81 - 315.71 SCFM)
DN50: 2.2 - 848.2 Nm³/h (1.22 - 493.35 SCFM)
Accuracy - flow (*measured value)
±(3 % of mv* + 0.3% of full scale)
Measuring range - temperature
-20...60 °C (-4...140 °F)
Accuracy - temperature
± 0.7 °C (1.26 °F)
0/4-20 mA, Pulse, Switch, Modbus RTU, M-Bus or IO-Link
18 - 30 V DC

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