Fluid Components International 8-66B_12-64B Series Manual Glossary - Manual

Doc. No. 06EN003264 Rev. A B - 1 Models 12-64/8-66 Basic Switch
APPENDIX B - GLOSSARY FLUID COMPONENTS INTL
ABBREVIATIONS
Delta R ( D D D D D R) Resistance differential
Delta T (D (D (D (D (D T) Temperature differential
DMM Digital Multimeter
FCI Fluid Components Intl
HTR Heater
LED Light Emitting Diode
RA Repair Authorization
RTD Resistance Temperature Detector
DEFINITIONS
Active RTD The sensing element part that senses the fluid flow rate or wet/dry condition.
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 sensing element signal.
Heater (HTR) The sensing element part that heats the active RTD.
Local enclosure The enclosure attached to the sensing element.
Reference RTD The sensing element part that senses the fluid temperature.
Resistance differential
Delta -R (
D D D D D R) The sensing element signal.
Resistance Temperature
Detector (RTD)
A sensor whose resistance changes proportionally to detector
temperature changes.
Sensing element The portion of the flow switch that contains the thermowells, RTDs,
and produces a signal with a defined relationship to the
flow rate or wet/dry condition.
Temperature differential
Delta -T (
D D D D D T) The difference in temperature between the active and
reference RTDs.
Thermowell The sensing element part that protects the heater and RTD's
from the process fluid.
Appendix B. Glossary