User Manual

Doc. No. 06EN003250 Rev. N/C B - 1 FLT
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Series FlexSwitch
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Rack Mount
APPENDIX B - GLOSSARY FLUID COMPONENTS INTL
ABBREVIATIONS
Delta-R (∆R) Differential Resistance
Delta-T (∆T) Differential Temperature
DMM Digital Multimeter
DPDT Double Pole Double Throw
FCI Fluid Components Intl
HTR Heater
LED Light Emitting Diode
POT Potentiometer
RA Return Authorization
RTD Resistance Temperature Detector
SFPS Standard Feet Per Second
SPDT Single Pole Double Throw
DEFINITIONS
Active RTD The of the sensing element that is heated by the heater. The active RTD
is cooled due to increases in the process fluid flow rate or density (level sensing).
Differential resistance
Delta-R (∆R) The difference in resistance between the active and reference RTDs.
Differential temperature
Delta-T (∆T) The difference in temperature between the active and reference RTDs.
Heater (HTR) The part of the sensing element that heats the active RTD.
Local enclosure The enclosure attached to the sensing element.
Reference RTD The part of the sensing element that senses the process media temperature.
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 part of the sensing element that protects the heater and RTDs
from the process fluid.
Turndown The ratio of the upper to lower flow rate values.
Appendix B. Glossary