FCI ST100A Series, Инструкция по установке, эксплуатации и обслуживанию, Страница: 157 / 170

ST100A Series Flow Meter APPENDIX C – GLOSSARY
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APPENDIX C GLOSSARY
Abbreviations
AST™ Adaptive Sensing Technology
Delta- R (ΔR) Resistance differential
Delta- T (ΔT) Temperature differential
DMM Digital Multimeter
ESD Electrostatic discharge
FCI Fluid Components International
HTR Heater
GND Ground
LCD Liquid crystal display
LED Light Emitting Diode
OIS Ordering Information Sheet
RTD Resistance Temperature Detector
Definitions
Active RTD The flow element part that senses the fluid flow rate.
Adaptive Sensing
Technology (AST™)
An FCI exclusive flow measurement technique that combines both constant
Delta T and constant power measuring techniques in a single device.
Resistance Differential
Delta- R (ΔR)
The difference in resistance between the active and reference RTDs.
Temperature Differential
Delta- T (ΔT)
The difference in temperature between the active and reference RTDs.
Flow Transmitter The portion of the flow meter that conditions, converts and scales the flow signal.
Heater (HTR) The flow element part that heats the active RTD.
Local Enclosure The enclosure attached to the flow element (usually contains the wiring
terminal block).
Reference Flat A flat part on the sensor head that helps to orient the sensor head to the flow.
Reference RTD The flow element part that senses the fluid temperature.
Remote Enclosure The enclosure that houses the flow transmitter remotely from the sensor head.
Resistance Temperature
Detector (RTD)
A sensor whose resistance changes proportionally to temperature changes.
Sensing Element The transducer portion of the instrument. The sensing element produces an
electrical signal that is related to the flow rate, density (level sensing), and
temperature of the process media.
Thermowell The flow element part that protects the heater and RTDs from the process media.
Turndown The ratio of minimum flow rate to maximum flow rate.