B - Glossary - Partlow MRC 7800 Installation, Wiring, Operation Manual

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Appendix B
Glossary
Display Filter Factor
This parameter is adjustable from 1 to 20 which represents the number of scans of the
process variable that are averaged together before updating the displayed and recorded
value, and process value for retransmission. The factory default is 1=no filtering. Display
code dFF.
Flow Time Base
Specifies whether the displayed process value is in units/second, units/minute, units/hour or
units/day, such that the flow rate can be converted to flow for totalization. Factory default = 1,
units/second. Display code Ftb.
Hysteresis
The paramter is adjustable from 0 to 1000 units representing the width of the band (half above
and half below alarm setting). Factory default =10. Display code HyAo.
Input Correction
This parameter is adjustable from -1000 to 1000 units and is used as a method to compen-
sate for a linear sensor error. Factory default is 0=no correction. Display code iCor.
Platen
The flat surface in the instrument upon which the chart rotates.
Process Filter Factor
This parameter is adjustable from 1 to 20 which represents the number of scans per second
of the process variable that are averaged together before updating the process value used for
alarm, presets. The factory default value is 1=no filtering. Display code PFF.
Process Output
Allows retransmisstion of the process variable. Factory default is 0=not selected. Display
code Pout. If selected, a current output must be assigned to it and scaled using Process
Output upper and lower values.
Process Output Upper and Lower Values
(used in conjunction with process output)
These parameters specify the process value range over which the assigned current output will
decrease linearly from 100% to 0%. If the process value is greater than Pou the output will
be 100%. If the process value is less than PoL the output will be 0%. Factory default values
are 100.0 for the upper value and 0 for the lower value. Display codes Pou (upper) and PoL
(lower).
Process Rounding
This parameter is adjustable from 0 to 1000 units and is used to round the process value to
the nearest value specified. Intended for use where the engineering units span is large, to
reduce fluctuation. Factory default is 0=no rounding. Display code Prnd (e.g.Prnd=3,
Process Value=-6, -3, 0, 3, 6, 9 ...).