Optional Configuration
Table 8-2 Cutoff default values
Cutoff type | Default | Comments |
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Mass flow | 0.0 g/s | Recommended setting: 5% of the sensor’s rated maximum flowrate |
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Liquid volume flow | 0.0 L/s | Limit: the sensor’s flow calibration factor in liters per second, multiplied by 0.2 |
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Gas standard volume | 0.0 | No limit |
flow |
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Density | 0.2 g/cm3 | Range: |
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To configure cutoffs:
•Using ProLink II, see Figure
•Using a DeviceNet tool, see Tables
Note: This functionality is not available via the display menus.
8.3.1Cutoffs and volume flow
If you are using liquid volume flow measurement:
•The density cutoff is applied to the volume flow calculation. Accordingly, if the density drops below its configured cutoff value, the volume flow rate will go to zero.
•The mass flow cutoff is not applied to the volume flow calculation. Even if the mass flow drops below the cutoff, and therefore the mass flow indicators go to zero, the volume flow rate will be calculated from the actual mass flow process variable.
If you are using gas standard volume flow measurement, neither the mass flow cutoff nor the density cutoff is applied to the volume flow calculation.
8.4Configuring the damping values
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.
Damping can be configured for flow, density, and temperature.
When you change the damping value, the specified value is automatically rounded down to the nearest valid damping value. Valid damping values are listed in Table
Note: For gas applications, Micro Motion recommends a minimum flow damping value of 2.56.
Before setting the damping values, review Section 8.4.1 for information on how the damping values affect other transmitter measurements.
Using a DeviceNet Tool
Required Configuration
Using the Transmitter
Optional Configuration
Configuration and Use Manual | 59 |
