Fluid Components International ST100 Series - Manual (Page 5)

ST100 Series Flow Meter GENERAL
Fluid Components International LLC 1
1 GENERAL
Product Description
The ST100 Series is a thermal dispersion, industrial process grade air/gas flow meter. It is suitable for all air and gas flow measurement applications
in line sizes from 1” to 100” [25 to 2500 mm] and larger. The instrument provides direct mass flow measuring and measures flow rate, totalized flow
and temperature, and the STP versions add pressure measurement.
The measurements are made available to the user by way of 4-20mA analog output channels with HART or pre-selected digital bus protocols. The
optional graphics display provides real-time process variable values along with flow range and process description information.
There are no moving parts to clean or maintain. It is offered in a wide selection of process connections to fit with any process piping and versions are
available for temperature service from -40°F [-40°C] to 850°F [454°C].
ST100’s electronics/transmitter can be integrally mounted with the flow sensor or remote mounted up to 1000’ [300m] from the sensor element.
Additional patented and/or FCI exclusive features include VeriCal® in-situ calibration verification, SpectraCalTM user selectable gas mixes, Dual
sensor/single transmitter models and a built-in data logger capable of storing more than 20M readings. All ST100’s are precision calibrated in FCI’s
world-class, NIST traceable calibration facility on one of our flow stands matched to your gas application and actual installation conditions.
Theory of Operation
The instrument functionally is based on the thermal dispersion operating principal. A low powered heater produces a temperature differential
between two resistance temperature detectors (RTDs) by heating one of the RTDs above process temperature. As the process mass flow rate
changes, the differential temperature between the RTDs changes. The differential temperature between the RTDs is proportional to the process
mass flow. The flow transmitter converts the RTD differential temperature signal into a scaled flow output signal. The signal from the unheated RTD
is used to provide the process temperature value.
Safety Instructions
• Warning – Explosion Hazard. Do not disconnect equipment when flammable or combustible atmosphere is present.
• Field wiring shall be in accordance with NEC (ANSI-NFPA 70) for Division 2 hazardous locations CEC (CSA C22.1) for division 2 locations as
applicable.
• The instrument must be installed, commissioned and maintained by qualified personnel trained in process automation and control
instrumentation. The installation personnel must ensure the instrument has been wired correctly according to the applicable wiring diagram.
• All location specific installation and wiring requirements must be met and maintained. FCI recommends an input power circuit breaker be
installed between the power source and the flow meter. This facilitates easy power disconnection during commissioning and maintenance
procedures. A switch or circuit breaker is required if installation is in a hazardous area.
• The flow meter contains electrostatic discharge (ESD) sensitive devices. Use standard ESD precautions when handling the circuit board
assemblies.
• Hazardous Areas: The instrument is designed for use in hazardous areas. The approved area classification is identified on the nameplate along
with the temperature and pressure limitations. The USB port and the Serial Communication port do not support the hazardous area requirements
and should only be used when the area is declassified.
• When mounting the flow element into the process pipe, it is important that a lubricant/sealant is applied to the mating threads. A lubricant/
sealant compatible with the process conditions should be used. All connections should be tightened firmly. To avoid leaks do not overtighten or
cross- thread connections.
Order Verification
• Verify the received hardware matches the purchased hardware and application requirements. Verify the Model number part number on the
instrument I.D. tag (i.e. ST100 – 10C0…) matches the purchased Model number part number.
• Review the Calibration requirements as specified on the Engineering Data Sheet in the documentation package. Verify the flow, temperature
and pressure limits meet the application requirements.
Hardware - Model Descriptions
ST100 – Single point insertion element with flow and temperature process output
ST100L – In Line element with flow and temperature process output
ST102 – Dual point insertion elements with flow and temperature process output