Fluid Components International RF83 Manual Glossary - Manual

Doc. No. 003147 Rev. B B - 1 Model RF83 Flow Switch
APPENDIX B - GLOSSARY FLUID COMPONENTS INTL
ABBREVIATIONS
Delta R ( D D D D D R) Differential Resistance
Delta T (D (D (D (D (D T) Differential Temperature
DMM Digital Multimeter
FCI Fluid Components Intl
HTR Heater
LED Light Emitting Diode
RA Repair Authorization
RTD Resistance Temperature Detector
DEFINITIONS
Active RTD The flow element part that senses the fluid flow rate.
Balance A number that is used to balance or match the
active and reference RTDs when the heater is off.
Control circuit The portion of the flow switch that conditions, converts, and scales
the flow element signal.
Differential resistance
Delta -R (
D D D D D R) The flow element signal.
Differential temperature
Delta -T (
D D D D D T) The difference in temperature between the active and
reference RTDs.
Flow element The portion of the flow switch that contains the thermowells, RTDs,
and produces a signal with a defined relationship to the flow rate.
Heater (HTR) The flow element part that heats the active RTD.
Local enclosure The enclosure attached to the flow element
(contains the wiring terminal block when a remote enclosure is used).
Reference RTD The flow element part that senses the fluid temperature.
Remote enclosure The enclosure that contains the control circuit, and is
connected to the local enclosure by an electrical cable.
Resistance Temperature
Detector (RTD)
A sensor whose resistance changes proportionally to detector
temperature changes.
Thermowell The flow element part that protects the heater and RTD's
from the process fluid.
Appendix B. Glossary