ST75V flow meter for accurate gas flow monitoring in heat treating processes

AMS Instrumentation and Calibration introduces a new direct mass flow meter from Fluid Components International (FCI) designed
to improve process control, reduce gas costs and
increase throughput in heat treating process applications.

Poor fuel-to-air ratio mixing control and monitoring
of consumable gases in heat treating processes is a common issue. Many existing
flow measurement and control technologies fall short in terms of accuracy,
capability to measure over a broad flow range and suitability for various gases.
These shortcomings result in a continuous series of compromises that negatively
affect heat treating process quality and consumable cost objectives.

However, not all
air/gas flow meter sensing technologies can provide the proper air-to-gas
mixture ratio within the typically required 4:1 turndown range and maintain the
accuracy necessary for optimum heat treating processes. Orifice plates, for instance,
which operate with differential pressure sensing technology, use additional
pressure and temperature sensors to provide mass flow (rather than volumetric)
measurement. They also require longer piping straight runs for accurate
measurement, which is a problem when designing small footprint heat treating
process production lines.

FCI’s compact ST75V air/gas
flow meter offers an alternative solution for heat treating process control
that provides direct mass flow measurement for accuracy, operates over a wide
turndown range and supports all common and speciality fuel gases. It features
integral advanced flow sensing electronics with the necessary measurement
accuracy and repeatability for heat treating processes.

Key features of the ST75V
flow meters include in-line (spool-piece) design with no moving parts; available
for use in pipe diameters from 6mm to 51mm; male NPT, female NPT, and flanged process
connection options; wide 100:1 turndown with ability to measure from 0.01 NCMH
to 950 NCMH; and Vortab flow conditioner built into the spool-piece providing
accurate and repeatable flow measurement for installations with limited pipe straight-runs
and/or for operating in transitional flow ranges.

The sensing element
is designed with precision platinum RTDs in small diameter, ‘equal-mass’,
all-metal thermowells for high accuracy, repeatability and fast response. Standard
accuracy is ±1% reading, ±0.5% full scale. The ST75V’s electronics are housed
in a rugged, IP67 rated enclosure with dual conduit ports in either NPT or M20
threading. The instrument comes standard with dual 4-20 mA outputs and a 500 Hz
pulse output.

FCI’s Model ST75AV flow
meter includes HART as well as NAMUR compliant 4-20 mA outputs and SIL
compliance rating. The flow meter’s transmitter/electronics can be integrally
mounted with the flow element (probe) or remote mounted to best match the
installation. The complete instrument carries global Ex agency approvals for
Division 1/ Zone 1 installations.

The ST75V meter’s
fully scalable dual 4-20mA standard outputs are user assignable to flow rate
and/or temperature and a 0-1kHz pulse output of total flow. The instrument can
be ordered for input power with either 18 to 36 Vdc or 85 to 265 Vac, with or
without a built-in LCD digital display.

The durable ST75V flow
meter withstands process temperatures from -18¡C to 121¡C; operates at
pressures up to 16.5 bar (g) with a standard t-fitting (NPT female) process
connection; and withstands 41 bar (g) with a tube process connection.

Please visit the AMS Instrumentation & Calibration website at for more information or
call 03-9017 8225, or Freecall (NZ) 0800 442 743.

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