Micro Motion RFT9709 Manual de instrucciones Pagina 142

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128
Using ProLink
®
Software with Micro Motion
®
Transmitters
Configure Menu: Events
continued
Configuring event parameters
Figure 12-1. Configure Events dialog box
Process variables
Any process variable, including a mass or volume total or inventory, can
control the state of an event indicator. To select a process variable for an
event, open the Event 1 or Event 2 variables list box.
When outputs function as event indicators, the transmitter periodically
compares the measured value of the assigned process variable against
the setpoint. The process variable determines the rate of the
comparison.
Table 12-1
summarizes rates of comparison between the
measured value and the setpoint, based on the process variable
assigned to the event.
Table 12-1. Event setpoint and process variable comparison
Low and high alarms
Event 1 or Event 2 can serve as a low or high process alarm. Use the
Type list boxes to configure alarms.
With any process variable except a total or inventory assigned to an
event, the following conditions determine the alarm state:
A high alarm is ON if the measured value is equal to or greater than
the setpoint. Otherwise, the alarm is OFF.
A low alarm is ON if the measured value is equal to or less than the
setpoint. Otherwise, the alarm is OFF.
Process variable assigned to event
Frequency of comparison
between setpoint and measured value of variable
Mass total (mass inventory)
Volume total (volume inventory)
1000 comparisons per second
Mass flow
Volume flow
1 comparison every 2 tube cycles, or approximately 20 to 80 comparisons per second,
depending on sensor size, flow tube construction material, and process fluid density
Density 10 comparisons per second
Temperature 1 comparison every 0.8 seconds, or 1.25 comparisons per second
Differential pressure
Viscosity
1 comparison per second
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