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

Appendix b. glossary

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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