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Reference Manual
00809-0100-4665, Rev AA
August 2010
Rosemount 8732
4-14
Time Limit
0 to 256 Seconds
The time limit parameter forces the output and running average values to the
new value of an actual flow rate change that is outside the percent limit
boundaries. It thereby limits response time to flow changes to the time limit
value rather than the length of the running average.
For example, if the number of samples selected is 100, then the response
time of the system is 10 seconds. In some cases this may be unacceptable.
By setting the time limit, you can force the 8732E to clear the value of the
running average and re-establish the output and average at the new flow rate
once the time limit has elapsed. This parameter limits the response time
added to the loop. A suggested time limit value of two seconds is a good
starting point for most applicable process fluids. The selected signal
processing configuration may be turned ON or OFF to suit your needs.
Coil Drive Frequency
Coil drive frequency allows pulse-rate selection of the sensor coils.
5 Hz
The standard coil drive frequency is 5 Hz, which is sufficient for nearly all
applications.
37 Hz
If the process fluid causes a noisy or unstable output, increase the coil drive
frequency to 37 Hz. If the 37 Hz mode is selected, perform the auto zero
function with no flow and a full sensor.
Low Flow Cutoff
Low flow cutoff allows you to specify the flow rate, between 0.01 and 38.37
feet per second, below which the outputs are driven to zero flow. The units
format for low flow cutoff cannot be changed. It is always displayed as feet per
second regardless of the format selected. The low flow cutoff value applies to
both forward and reverse flows.
Device Info Information variables are used for identification of flowmeters in the field and
to store information that may be useful in service situations. Information
variables have no effect on flowmeter output or process variables.
Device ID
This function displays the Device ID of the transmitter. This is one piece of
information required to generate a license code to enable diagnostics in the
field.
PV Sensor S/N
The PV sensor serial number is the serial number of the sensor connected to
the transmitter and can be stored in the transmitter configuration for future
reference. The number provides easy identification if the sensor needs
servicing or for other purposes.
Sensor Tag
Sensor tag is the quickest and shortest way of identifying and distinguishing
between sensors. Sensors can be tagged according to the requirements of
your application. The tag may be up to eight characters long.