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FCI ST100L thermal mass air/gas flow meter for municipal water disinfection

AMS Instrumentation and Calibration introduces a range of flow meters from Fluid Components International (FCI) designed for cramped chlorine equipment in municipal water systems.

FCI’s Model ST100L air/gas inline thermal mass flow meters with Vortab flow conditioner provide accurate flow measurement without the long straight pipe runs required by other meters.

Disinfection systems are used by all municipal water system operators to kill germs and provide a safe source of clean drinking water. Operators use different methods of disinfection treatment such as chlorine and ozone; however, chlorine remains a popular disinfectant choice around the world. Accurate chlorine gas measurement is essential for disinfection and safe operation of the system where chlorine systems are in use.

Chlorine measurement presents a challenge for flow meter manufacturers since they are unable to calibrate chlorine gas flow meters accurately because of safety hazard regulations applicable on the use of chlorine gas at their facilities. Research has additionally shown that the theoretical ‘air equivalency’ calibrations for chlorine gas are inaccurate and inadequate. To address this problem, certified FCI field technicians perform on-site calibration adjustments to match the site-specific installation.

FCI’s Model ST100L is an inline, spool piece gas mass flow meter suitable for chlorine gas service and available with an optional Vortab flow conditioner. The inline flow meter is designed specifically for line sizes of 1, 1.5 or 2 inches (DN25, DN40 or DN50). The built-in Vortab flow conditioner overcomes any lack of available straight-run pipe in the installation and eliminates both swirl and profile disturbances throughout the full flow range to produce a repeatable flow profile for accurate, highly repeatable flow measurement.

The ST100L flow meter is typically installed in a water disinfection system’s chlorine gas inlet line to the chlorinator panel.

Key features of FCI’s ST100L flow meters include wetted material comprising of sensor element, inline flow body, flow conditioner and process connections fabricated from Hastelloy C-276 for corrosion protection and long life in corrosive chlorine gas environments; choice of multiple communication options from 4-20 mA analogue, frequency/pulse, or certified digital bus communications such as HART, Foundation Fieldbus, Profibus PA or Modbus RS485; and graphical, multivariable backlit LCD display with readout continuously displaying process measurements and alarm status for easy on-site viewing by technicians.

Constant power thermal mass flow sensing technology measures flow with 100:1 turndown in ranges from 0.01 to 3140 NCMH. The transmitter/electronics can be integrally mounted with the flow body or remote mounted up to 305m away. The transmitter enclosure is NEMA4X/IP67 rated and available in painted aluminium or stainless steel.

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