FCI MT86 - Appendix Bglossary

MT86/MT86HT Flow Meter APPENDIX B – GLOSSARY
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APPENDIX B GLOSSARY
Abbreviations
Delta-R (ΔR)
Resistance differential
Delta-T (ΔT)
Temperature differential
ESD
Electrostatic discharge
FCI
Fluid Components International
HTR
Heater
GND
Ground
LCD
Liquid crystal display
LED
Light Emitting Diode
RTD
Resistance Temperature Detector
SFPS
Standard Feet Per Second
Definitions
Active RTD
The flow element part that senses the fluid flow rate.
Differential
Resistance
Delta -R (DR): The flow element signal.
Differential
Temperature
Delta -T (DT): 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 is used to orient the sensor head to the flow.
Reference RTD
The flow element part that senses the fluid temperature.
Remote Enclosure
The enclosure that protects the flow transmitter.
Resistance
Temperature
Detector
RTD: A sensor whose resistance changes proportionally to detector temperature
changes.
Span
An adjustment that establishes at what flow rate the flow transmitter's output is full
scale.
Also, the difference between the upper and lower flow rate values.
Thermowell
The flow element part that protects the heater and RTDs from the process fluid.
Turn down
The ratio of the upper to lower flow rate values.
Zero
An adjustment that establishes at what flow rate the flow transmitter's output is zero.