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.

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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

You want to know more about our products?
We are looking forward to help you.

You want to know more about our products?
We are looking forward to help you.

Key Features EE741

  • 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

Technical data EE741

  • standardized volumetric flow, mass flow, standardised flow, temperature, consumption

    Measured values
  • DN15 / DN20 / DN25

    DN32 / DN40 / DN50

    Pipe diameter
  • 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)

    Measuring range - flow
  • ±(3 % of mv* + 0.3% of full scale)

    Accuracy - flow (*measured value)
  • -20...60 °C (-4...140 °F)

    Measuring range - temperature
  • ± 0.7 °C (1.26 °F)

    Accuracy - temperature
  • 0/4-20 mA, Pulse, Switch, Modbus RTU, M-Bus or IO-Link

  • 18 - 30 V DC


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  • What is the difference between Modbus RTU and Modbus TCP/IP?

    The main difference is the hardware interface. The Modbus RTU protocol runs on RS485 Hardware while Modbus TCP/IP protocol on Ethernet hardware.

  • I mounted the mass flow transmitter against the flow direction during factory adjustment. What additional error shall I expect?

    The additional measurement error is up to 3 % of the measured value

  • What calibration certificate is included in the standard scope of supply of the E+E mass flow sensors?

    The standard scope of supply of E+E mass flow measurement devices includes an inspection certificate according DIN EN 10204 - 3.1. For details on calibration certificates please see our white paper "Calibration and Traceability in Measuring Technology".

  • Can E+E supply an accredited calibration certificate with the mass flow transmitter?

    Accredited calibration certificate formass flow is available upon request, please see our calibration website.

  • How can I adjust the mass flow transmitter?

    For readjusting the mass flow sensor you need first of all a reliable reference. In case this is not available, please return the device to E+E for service. Otherwise see the readjustment procedure in the operation manual of the specific E+E mass flow sensor available at

  • E+E mass flow measure the Normal Volume referring normal conditions 0 °C and 1.013 mbar (14,7 psi, 32 °F), according standard DIN 1343. Can I change the normalization parameters according my standard definitions?

    Yes. Use the E+E Product Configuration Software, section "Process Parameters". See operation manual of the specific E+E device.

  • What is the difference between a 2 wire and a 3 wire current output?

    Transmitter with "two-wires" technology receive the power from the process, and the signal is carry on return wire (closed current loop). With technology "three-wires" the power supply is separate from current output: 2 wires are the power supply and third carry the signal.

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