Fluid Components International MT86, MT86HT Glossary

APPENDIX B - GLOSSARY FLUID COMPONENTS INTL

Appendix B. Glossary

ABBREVIATIONS

ACT EXC Active excitation
ACT SEN Active sense
Delta R (DR) Differential resistance
Delta T (DT) Differential temperature
ESD Electrostatic discharge
FCI Fluid Components Intl
GND Ground
GND SEN Ground sense
LCD Liquid crystal display
LED Light emitting diode
REF EXC Reference excitation
REF SEN Reference sense
RTD Resistance Temperature Detector

DEFINITIONS

Active excitation ACT EXC: The active RTD supply current.

Active RTD The flow element part that senses the fluid flow rate.

Active sense ACT SEN: The active RTD voltage measurement.

Differential resistance Delta -R (DR): The flow element signal.

Differential temperature Delta -T (DT): The difference in temperature between the active and

reference RTDs.

Flow arrow An indication mark used to properly orient the flow element in relation to the “

fluid flow direction.

Flow transmitter The portion of the flowmeter that conditions, converts and scales the flow signal.

Ground sense GND SEN: The ground voltage measurement.

Heater HTR: The flow element part that heats the active RTD.

Local enclosure The enclosure attached to the flow element (usually contains the wiring

terminal block).

Orientation Flat A datum plane used to properly orient the flow element in the fluid conduit.

Range The flow rate measurement region as defined by the lower and upper limits.

Reference excitation REF EXC: The reference RTD supply current.

Reference RTD The flow element part that senses the fluid temperature.

Reference sense REF SEN: The reference RTD voltage measurement.

Remote enclosure The enclosure that protects the flow transmitter.

Doc. No. 003162 Rev. F B - 1 Models MT86, MT86HT

FLUID COMPONENTS INTL APPENDIX B - GLOSSARY

Resistance Temperature RTD: A sensor whose resistance changes proportionally to
Detector detector temperature changes.

Span An adjustment that establishes at what flow rate the

flow transmitter's output is full scale.
(Also, the difference between the upper and lower flow rate values.

Thermal flowmeter An instrument that uses thermal technology to measure fluid flow rate.

Thermowell The flow element part that protects the heater and RTDs from the process fluid.

Turn down The ratio of the upper to lower flow rate values.

Zero An adjustment that establishes at what flow rate the flow transmitter's

output is zero.

Models MT86, MT86HT B - 2 Doc. No. 003162 Rev. F