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Reference, Installation, and Operations Manual Section 6: Meter operation
3-9000-743 Rev S June 2013
Flow-condition pressure and temperature 207
Data updates
When the Option Board is used, the Daniel Mark III Ultrasonic Gas Flow Meter samples the input
analog signal(s) and updates the corresponding data point(s)
(LiveFlowPressure, LiveFlowTemperature) once per second regardless of the input selection
(disabled, live, or fixed).
Every five seconds, the meter updates the “in-use” flow-condition pressure and temperature
values (FlowPressure, AbsFlowPressure, FlowTemperature) depending upon the input
selection, validity of the input data, and the selected data source upon alarm according to
Tab le 6 -6.
Table 6-6 Flow-condition pressure and temperature data source
Input Type
(EnablePressureInput or
EnableTemperatureInput)
Data Validity
(PressureValidity or
TemperatureValidity)
Data Source Upon Alarm
(FlowPOrTSrcUponAlarm)
“In-Use” Data Source
(FlowPressure or
FlowTemperature)
Disabled N/A N/A “In-Use” value unchanged
Live Valid N/A Average of live values
(LiveFlowPressure or Live-
FlowTemperature)
Invalid* Last good value “In-Use” value unchanged
Fixed Fixed data point
(SpecFlowPressure or Spec-
FlowTemperature)
Fixed Valid N/A Fixed data point
(SpecFlowPressure or Spec-
FlowTemperature)
Invalid Last good value “In-Use” value unchanged
Fixed Fixed data point
(SpecFlowPressure or Spec-
FlowTemperature)
*Live input can be invalid due to (a) one or more live values is/are at or outside the alarm limits, or (b) the input is being cali-
brated.