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40 Micro Motion
®
Model 1500 Transmitters with the Filling and Dosing Application
Optional Transmitter Configuration
6.6.3 Interaction with the update rate
Flow and density damping values depend on the configured Update Rate (see Section 6.7). If you
change the update rate, the damping values are automatically adjusted. Damping rates for Special are
20% of Normal damping rates. See Table 6-2.
Note: The specific process variable selected for the Special update rate is not relevant; all damping
values are adjusted as described.
6.7 Configuring the update rate
The update rate is the rate at which the sensor reports process variables to the transmitter. This affects
transmitter response time to changes in the process.
There are two settings for Update Rate:
Normal and Special.
• When
Normal is configured, most process variables are polled at the rate of 20 times per
second (20 Hz).
• When
Special is configured, a single, user-specified process variable is reported at a faster
rate, and all others are reported at a slower rate. If you set the update rate to
Special, you must
also specify which process variable will be updated at 100 Hz. Polling for some process
variables and diagnostic/calibration data is dropped (see Section 6.7.1), and the remaining
process variables are polled a minimum of 6 times per second (6.25 Hz).
Not all process variables can be used as the 100 Hz variable. Only the following process variables can
be selected:
• Mass flow rate
• Volume flow rate
For the Model 1500 transmitter with the filling and dosing application,
Special is the default, and the
100 Hz variable is automatically set to the variable configured as the fill flow source (mass flow rate
or volume flow rate).
For filling and dosing applications, Micro Motion recommends:
•Use
Special for all “short” applications (fill duration less than 15 seconds).
•Use
Normal for all “long” applications (fill duration of 15 or more seconds).
For all other applications, Micro Motion recommends using the
Normal update rate. Contact Micro
Motion before using the
Special update rate for other applications.
Note: If you change the Update Rate setting, the setting for damping is automatically adjusted. See
Section 6.6.3.