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Appendix G. Glossary
Transport® Model PT878 Portable Liquid Flowmeter User’s Manual 259
Appendix G. Glossary
AGC — Automatic gain control, which sets the receive amplifier based on
measured signal strength. This electronic circuit automatically adjusts the
gain of the receive amplifier to maintain the correct receive signal
amplitude.
Calibration Factor — Correction factor used as a reference for the
flowmeter electronics to ensure accurate readings, and available either as a
single number or as a table.
Delta-T Offset — A programmed value of which half is added to the
upstream transit time and half is subtracted from the downstream transit
time. It can be used to offset the flow velocity reading, and is normally set
to zero.
Detection Threshold — Percent of peak the PT878 thickness gauge uses to
make measurements
Energy Option — Option that enables flow measurement in a heating or
cooling system. The option calculates the energy of a system based on the
temperature at a supply point, the temperature at a return point, and the flow
of fluid through the system.
Errors Allowed — Parameter that specifies the number of errors the meter
can record before displaying an error message. The number of errors is N
out of 16 where N equals the number of errors allowed.
Flowcell — The part of the flowmeter system, consisting of the flowcell
pipe and the transducers, that uses ultrasonic pulses to interrogate the flow.
Flowcell Pipe — A section of piping that acts as part of the flowcell; it is
either a section of existing piping with the transducers or inserted as a
substitute pipe section (spoolpiece).
Form — Software window that opens when a user enters a given menu.