TFA Flowmeters

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Our innovative TFA flowmeter is designed to meet the challenges of economically monitoring steam flow in small line sizes, so you can accurately assess energy use to help reduce consumption and improve performance in every area of your plant.

TFA Flowmeter

TFA Flowmeter

The TFA flowmeter is designed for use on saturated steam only and operates on the target principle, by measuring the force produced on a target by the fluid flow. This force is then converted into density compensated mass flowrate or power and is transmitted via a single loop powered 4-20 mA and pulsed output.
TFA flowmeters also incorporate a totalised flow function and EIA 232C (RS232) or EIA 485C (RS485) Modbus communications.

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Technical Information

Sizes and pipe connection



DN25, DN32, DN40 and DN50


Flowmeter body

Stainless steel 300 series

Flanged EN 1092-1 PN16, PN25 and PN40



Stainless steel 431 S29 / 300 series            

Japanese Industrial Standard JIS 20 and Korean Standard KS 20


1", 1¼", 1½" and 2"  
Flanged ASME B 16.5 Class 150 and Class 300   Flowmeter stem  Stainless steel 300 series

Note: The Spirax Sarco TFA flowmeter should be installed in pipework manufactured to BS 1600, ASME B 36.10 Schedule 40 or EN 10216-2 / N 10216-5 equivalent. For systems with different standards / schedules, please contact Spirax Sarco.


Electronics housing

Aluminium LM25



Technical data

IP rating

IP65 with correct cable glands

Power supply

Loop powered

with optional RS485: 24VDC

Outputs - proportional to mass flow or power

4-20mA (not available with RS485 option)

Pulsed output: Vmax 28 Vdc Rmin 10 kW

Communication port

Modbus EIA 232C (RS 232C)

with optional RS485: EIA 485 (RS 485C)

Technical Documentation


TFA Flowmeter for Saturated Steam Service

reference number





  1. Description
  2. Sizes and pipe connections
  3. Technical data
  4. Materials


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Installation Documentation

document language reference number download
TFA Flowmeter Commissioning Flow Chart English IM-P193-04 Download PDF
TFA Flowmeter for Saturated Steam Service English IM-P193-02 Download PDF
TFA Flowmeter for Saturated Steam Service Essential Installation Guide English IM-P193-03 Download PDF

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