Doc. No. 06EN003291 Rev. A
B - 1
Model ST98 Flow Meter
APPENDIX B - GLOSSARY
FLUID COMPONENTS INTL
Appendix B. Glossary of Terms
A/D number
Analog to Digital number.
Area
Cross-sectional area for a process line.
( )
2
2
I.D.
or
2
r
=
duct
Circular
a
of
Area
π
π
Area of rectangular duct = Length x Width
COM1
COM2
Serial ports located on a personal computer.
DelR
The active RTD A/D number minus the reference RTD A/D number.
DVM
Digital Voltmeter.
EPROM
Erasable Programmable Read Only Memory.
Firmware
Software plus hardware. The software is written and then stored in a hardware
EPROM chip.
Flow Element
The portion of the flow meter that is contains the thermowells, RTDs, and
produces a signal with a defined relationship to the flow rate.
Flow Transmitter
The portion of the flow meter that conditions, converts, and scales the flow
element signal.
RefR
The A/D number corresponding to the reference RTD resistance.
RTD
A Resistance Temperature Detector operates on the principle of change in
resistance as a function of temperature.
SFPS
Standard Feet Per Second.
∆
∆∆
∆∆
R
The difference between two resistance values.
∆
∆∆
∆∆
T
The difference between two temperature values.
ST98 Parameter Definitions
A. ANALOG INPUT
Menu Function.
Channel 0 - 7
Analog signals describing inputs to the electronics.
B. SENSOR BALANCE
Menu Function.
Code
A passcode (942) is required to continue into the menu selection.
Balance#
A number found in the D portion of the menu. This number electronically matches
the active and reference RTD's when the heater is off.
C. CALIBRATE DISPLAY
Menu Function.
d=xxx
The display of Delta-R in the Calibrate Display menu.
r=xxx
The display or Ref-R in the Calibrate Display menu.
