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The Flexim FLUXUS G731 ST-HT delivers reliable, non-intrusive flow measurement of superheated steam at extreme temperatures—up to 630 °C (1166 °F)—without penetrating the pipe. Utilizing a correlation-based ultrasonic method, this advanced system achieves high measurement accuracy with excellent dynamic response, regardless of flow direction.

Designed for bi-directional flow measurement, the G731 ST-HT supports a wide turndown ratio of up to 10:1, ensuring precision across varying flow rates. Since it operates entirely from the pipe’s exterior and contains no moving components, it eliminates wear-related maintenance and offers long-term operational savings.

Installation is quick and non-disruptive, requiring no shutdowns or process interruptions. This makes the FLUXUS G731 ST-HT an ideal, cost-effective upgrade for existing steam systems where performance, reliability, and minimal maintenance are critical.

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 Winterization Enclosure Datasheet
FLEXIM Winterization Enclosure Datasheet
FLEXIM Start-Up Service Prerequisites Brochure
FLEXIM Start-Up Service Prerequisites Brochure
FLEXIM Rental Process
FLEXIM Rental Process
Flow Measurement Services
Flow Measurement Services
Flexim FLUXUS G731 ST-HT High-temperature Steam Measurement

Specs

Fluid type
Saturated and superheated steam
Accuracy
Measurement uncertainty at the measuring point (volumetric flow rate): ±3 to 4 % of reading
Repeatability
± 1 to 3 % of reading
Flow Channels
2
Range
Flow Velocity Range: depending on the application
Certifications/Approvals
FM Class I /Div 2
ATEX/IECEx Zone 2
Power supply
90-264VAC
11-32VDC
Pipe size
10 to 900 mm (0.39 to 35.4 inches)
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

  • No pressure loss, no pipe modification, no process interruption.
  • High dynamic flow range.
  • Easy and cost-efficient retrofit.
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