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Required Transmitter Configuration
Multiple cutoffs
Cutoffs can also be configured for the mass flow and volume flow process variables (see Section 8.4).
If mass flow or volume flow has been assigned to the mA output, a non-zero value is configured for
the flow cutoff, and the AO cutoff is also configured, the cutoff occurs at the highest setting, as shown
in the following examples.
Example
Example
6.5.4
Configuring added damping
A damping value is a period of time, in seconds, over which the process variable value will change to
reflect 63% of the change in the actual process. Damping helps the transmitter smooth out small,
rapid measurement fluctuations:
•
A high damping value makes the output appear to be smoother because the output must change
slowly.
•
A low damping value makes the output appear to be more erratic because the output changes
more quickly.
The Added Damping parameter specifies damping that will be applied to the mA output. It affects the
measurement of the process variable assigned to the mA output, but does not affect the frequency or
digital outputs.
Note: For most applications, the default added damping value is used. Contact Micro Motion
customer support before changing the Added Damping parameter.
46
Configuration:
•
mA output: Mass flow
•
Frequency output: Mass flow
•
AO cutoff for mA output: 10 g/sec
•
Mass flow cutoff: 15 g/sec
As a result, if the mass flow rate drops below 15 g/sec, all outputs
representing mass flow will report zero flow.
Configuration:
•
mA output: Mass flow
•
Frequency output: Mass flow
•
AO cutoff for mA output: 15 g/sec
•
Mass flow cutoff: 10 g/sec
As a result:
•
If the mass flow rate drops below 15 g/sec but not below 10 g/sec:
•
The mA output will report zero flow.
•
The frequency output will report nonzero flow.
•
If the mass flow rate drops below 10 g/sec, both outputs will report
zero flow.
Micro Motion
®
Model 2400S Transmitters with Analog Outputs
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