Owner manual

Doc. No. 06EN003264 Rev. A

B - 1

Models 12-64/8-66 Basic Switch

APPENDIX B - GLOSSARY FLUID COMPONENTS INTL

ABBREVIATIONS

Delta R (

DR) Resistance differential

Delta T

(D(D

(DT) 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 (

DR) 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 (

DT) 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

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APPENDIX B - GLOSSARY FLUID COMPONENTS INTL Appendix B. Glossary ABBREVIATIONS DR) Delta R (D Resistance differential Delta T (D DT) 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.
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FLUID COMPONENTS INTL Models 12-64/8-66 Basic Switch APPENDIX B - GLOSSARY B-2 Doc. No. 06EN003264 Rev.