Published 22-02-2022
| Article appears in February Issue

Precision Compressed Air Thermal Flow


The advanced FS10i Series Compressed Air Flow Meters from Fluid Components International(FCI) helps process and manufacturing engineers responsible for compressed air systems improve productivity. They do this by measuring accurately and quickly detecting system leaks, which improves overall process quality while simultaneously reducing system energy costs. 

According to AMS Instrumentation & Calibration, the compact FS10i Flow Meter Series is a “dependable, economical and easy to install solution” to measure the flow rate of compressed air, air and natural gas.

Go anywhere

They are accurate to ± 1.5% of reading, ±0.5% of full scale, with repeatability of ± 0.5% of reading and have a response time of 4 seconds (1 time constant). Their go anywhere small size, plug-in wiring and inline or insertion style threaded connection into plant piping ensures quick and effective installation. They are also SIL-2 rated for safety instrumented system (SIS) critical processes. 

Providing precision direct mass flow measurement, the FS10i Flow Meters require no additional pressure or temperature sensors or other components to infer flow measurement. Their sealed and no-moving parts sensor does not foul or clog and requires no routine maintenance that ensures years of trouble-free, continuous operation. 

Utilising decades-long, applications-proven thermal dispersion flow sensing technology, the FS10i Flow Meters provide a fluid-matched, calibrated and linearised 4-20mA output of flow rate, and a user programmable high or low flow alarm/trip point with a 1A SPDT relay output. For visual indication, the FS10i Flow Meters include a 10-segment LED array. This display illuminates proportionally to the flow rate and flashes if an alarm trip occurs.

The FS10i Flow Meters are available in both in-line and insertion style configurations to support installation in line sizes from DN25 to DN500. They operate over a wide, 100:1 turndown from 1,6 to 122 NCMH depending on the fluid media and line size. Their 316L stainless steel construction ensures superior corrosion resistance in the pipe. An aluminium housing, and protective, rubber boot surrounding the display area make the FS10i suitable for IP64 installations. 

The FS10i also carries global approvals: FM, FMc, ATEX, IECEx, and EAC/TR CU (Div 2) and Zone 2/Zone 2 installations. 

For line sizes of DN25 or DN50, the FS10i is built as an in-line solution with a stainless steel, female NPT pipe tee to ensure the instrument’s accuracy and repeatability in the installation. For line sizes 63,5 mm or larger, users can select the insertion-style configuration in either a 152 or 305 mm length. The insertion-style configurations are outfitted with a 0.5-inch compression fitting, with either a Teflon or stainless steel ferrule to adjust the actual insertion depth to be compatible with a range of pipe diameters and achieve inserting the sensor element to the center-point of the pipe. 

User set-up is performed using a PC connection to the instrument’s serial port, included computer interface dongle and using FCI’s free software utility program. 

User set-up functions include scaling of the 4-20mA output to the desired flow range and engineering units, setting the relay trip point and adding hysteresis or time delay to the relay’s action. 

Each meter is precision calibrated on FCl’s air and gas flow stands, which are outfitted with NIST and ISO/IEC 17025 traceable equipment to ensure accuracy and measurement repeatability. 


  1. The MAPT is a multiport self-averaging flow meter with a design based on the classical pitot tube concept of fluid flow measurement. It produces an averaged differential pressure (DP) signal proportional to the square of the flow rate. The DP output is normally piped to a Differential Pressure...
  2. Expanded ranges of high-ambient heat cabling are being stocked locally by LAPP Australia to assist companies in their Industry 4.0 digital transformation by shortening delivering times and increasing technical backup services for the globally respected ÖLFLEX® range.
    The LAPP ÖLFLEX® Expanded...
  3. A new line of industrial monitors that can help machine builders differentiate their machines and meet a wide range of application needs has been released by Rockwell Automation
    The new Allen-Bradley® ASEM 6300M industrial monitors, part of the product family formerly known as VersaView® 6300,...