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The Flexim FLUXUS G731 ST-LT is a high-performance ultrasonic clamp-on flow meter specifically designed for non-intrusive steam flow measurement at temperatures up to 180 °C (356 °F). With the capability to operate on up to two channels simultaneously, it delivers accurate and stable results—even under challenging flow conditions.

This versatile system offers a range of flexible input and output options to suit various application requirements. It is also available with a rugged stainless steel enclosure and FM Class I Division 2 certification, making it ideal for use in harsh or hazardous environments.

The meter uses the transit time difference method to provide precise readings at very low flow velocities—as low as 0.01 m/s (0.03 ft/s)—without needing to modify or constrict the pipe to achieve higher speeds. This non-invasive design reduces installation time, eliminates process interruptions, and lowers long-term operating costs, offering a cost-efficient measurement solution across the board.

Ultrasonic Clamp-On Flow Meter Rentals

Connect with our Team at Spartan Controls for a conversation about your flow application. Our team of flow experts will help you discover the optimal solution for your flow measurement needs. 

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Flexim FLUXUS G731 ST-LT Non-intrusive Steam Flow Measurement

Specs

Fluid type
Saturated and superheated steam
Accuracy
Measurement uncertainty of the measuring system (volumetric flow rate): ±0.3 % of reading ±0,005 m/s (±0.02 ft/s)
Measurement uncertainty at the measuring point (volumetric flow rate): ±1 to 3 % of reading ±0,005 m/s (±0.02 ft/s)
Repeatability
0.15 % of reading ±0,005 m/s (±0.02 ft/s)
Flow Channels
up to 2
Range
Flow Velocity Range: depending on pipe diameter and transducer
Certifications/Approvals
FM Class I /Div 2
ATEX/IECEx Zone 2
Power supply
90-264VAC
11-32VDC
Pipe size
23 to 1000 mm (0.9 to 39.4 inch)
Pressure range
3 to 10 barg (44 to 145 psig)
Temperature range (media)
+135 to +180°C (+275 to +356°F)
Output
4-20mA active/passive
4-20mA HART® active/passive
pulse/frequency/binary
Input
Temperature
4-20mA active/passive
Communication Protocol
Modbus RTU/TCP
BACnet MSTP/IP
Profibus PA
FOUNDATION Fieldbus
M-Bus

Features

  • SCA - Synchronized Channel Averaging function for difficult measuring points.
  • Transmitters available for FM Class I Division 2 and IECEx/ATEX Zone 2.
  • Stainless steel housing available.
  • Installation, commissioning and maintenance without process interruption.
  • Extremely high measuring dynamics - no need to reduce pipe diameters.
  • No flow range limitations - 0.01 to 60 m/s (0.03 to 197 ft/s).
  • Zero loss of pressure - zero loss of energy.
  • Bi-directional measurement.
  • Integrated mass flow measuring through the saturated steam curve and online measuring of temperature.
  • Advanced Meter Verification.
  • ISO 24062 compliant.
  • Flow disturbance correction to reduce required straight runs down to 2D inlet.