ST51 Mass Flow Meter
For Biogas, Digester Gas, Methane and Natural Gas
� Wastewater Treatment Plant Digester Systems
� Biogas Production and Recovery
— Anaerobic Digester Processes
— On-Farm Systems
— Fermentation Systems
� Landfill Gas Recovery Systems
� Co-Gen Power Systems
� Coal Mine and Coal Bed Methane Recovery
The Model ST51 Flow Meter is an accurate, easy to install, no moving parts
solution for measuring and controlling biogases, digester gases, methane and
natural gas flow. Model ST51 utilizes FCI proven thermal dispersion technology to
provide direct mass flow measurement resulting in higher performance at a lower
cost than orifice plates, DP, Vortex shedding and other thermal devices.
Biogas and digester gas applications are challenged by wide flow variations and
dirty, wet gas. Flow variation is experienced as these processes move from low
production start-up phases to a consistent, sustainable process and by seasonal
temperature change, where cold temperatures slow gas production and higher
temperature accelerate gas production. While the primary composition of these
gases is methane and CO
2
, residual H
2
S and wet vapor leave deposits and corrode
surfaces. ST51 provides the solution to these challenges. It features a wide-
turndown ratio, up to 100:1 and is highly sensitive to low flow measurement. To
measure correctly in fluctuating temperatures, flow meters must include temperature
compensation circuitry and it is standard in ST51. ST51 has no moving parts to foul
or clog and is easily pulled from the pipe for occasional cleaning.
Model ST51 installs in line sizes ranging from 2 inch to 24 inch [51 mm to 610 mm]
with 1/2 inch or 3/4 inch NPT.
The Model ST51 uses precision, lithography structured platinum RTD sensors
embedded in FCI’s equal mass small diameter thermowells. Combined with
microprocessor electronics and precision calibration, the Model ST51 achieves
excellent accuracy, fast response and virtually maintenance free operation.
Biogas, digester gas and landfill gas
compositions are dominated by
methane (CH
4
) and present a potentially
hazardous installation environment.
Sound engineering practice and often
regulations mandate that instrumentation
meet guidelines and have agency approvals for installation zone safety.
Depending on actual installation location, at a minimum the environment
will require Class I, Division II and often a more rigorous Class I,
Division I [Zone 1 II2GD Ex d IIC] approvals. FCI Model ST51 meets all
of these and has obtained the global agency approvals that ensure
your installation is always safe and complies with regulations. And,
unlike manufacturers who merely provide their transmitter electronics
in an approved OEM enclosure, FCI submits its entire instrument to
agency testing. FCI product approvals are different because they
are comprehensive system approvals that also take into account the
sensor and seal requirements as well the “T” (temperature) ratings.
FCI agency approvals are on the total instrument. With ST51 you are
assured of the integrity of total instrument approvals that meet or
exceed safe engineering practice for your applications.
Features
�
Triple Outputs
– Dual 4-20 mA Analog
– Pulse for Totalizer
�
No Moving Parts, Non-Clogging
�
Dual Line, Rate and Totalizer,
Digital Display
�
Small, Compact Design
�
Easy to Install
�
Hazardous Location Approved
�
Integral and Remote Mount
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