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42 Micro Motion
®
Series 3000 MVD Transmitters and Controllers
Configuring Inputs
7.3.1 Enabling and disabling core processor inputs
Core processor inputs are enabled by default. By disabling the core processor, you disable all core
processor input signals and alarms. Disabling them might be desirable while you are connecting the
sensor, or if you are using only the frequency input to measure flow.
Table 7-1 describes the core processor input options.
7.3.2 Configuring process variables
Process variables include mass flow, volume flow, density, and temperature. For each process
variable, several parameters can be configured.
Mass flow and volume flow parameters
Mass flow and volume flow parameters are listed and defined in Table 7-2. Note that you can
configure the transmitter to measure either liquid volume flow or gas standard volume flow,
depending on the setting of Volume Flow Type.
Details about the Flow Direction parameter are provided in Table 7-3. Units for mass flow and
volume flow parameters are listed in Tables 7-4 through 7-6. Special units for mass and volume are
defined and described in the section entitled Special units later in this chapter.
Table 7-1 Enabling or disabling inputs and alarms
Variable Default Description
Enable core processor Yes If set to No:
• The platform will not use input signals from the sensor to measure flow,
density, or temperature.
• The platform will not produce the following alarms: warming up, cal in
progress, drive overrange, temperature overrange, temperature failure,
sensor failure, transmitter failure, density overrange, density failure, mass
flow overrange, volume overrange, calibration failure, calibration complete,
calibration aborted, RTD failure, charize required, slug flow, slug timeout
(1)
.
(1) For more information about alarms, see Chapter 22.
Table 7-2 Flow parameters
Variable Default Description
Flow damping 0.8 sec • Damping filters out noise or the effects of rapid changes in the flow rate
without affecting measurement accuracy. See the section entitled Damping
later in this chapter. For gas applications, Micro Motion recommends a
minimum flow damping value of 2.56 seconds. Range is 0.0–51.2 seconds.
• Milliamp outputs have an additional damping parameter. See Section 8.4.4.
Flow direction Forward • Controls how flow through the sensor will affect outputs and totalizers.
• For the effect of flow direction on milliamp outputs, see Figure 7-3 if the 4 mA
value of the milliamp output is set to 0, and see Figure 7-4 if the 4 mA value
of the milliamp output is set to a negative value. For a discussion of these
figures, see the examples following the figures. For information on setting the
4 mA value, see Section 8.4.4.
• For the effect of flow direction on frequency outputs, totalizers, and flow
values reported via digital communication, see Table 7-3.
Mass units g/s • Select the desired unit of mass flow. See Table 7-4.
• Mass flow outputs and displays will indicate mass flow in the selected unit.
The mass totalizer and inventory will use the corresponding mass unit.
Mass low flow cutoff 0.00000 g/s • Enter the mass flow rate below which mass flow outputs and displays will
indicate zero flow. See the section entitled Cutoffs later in this chapter.
• Milliamp outputs have an additional cutoff parameter. See Section 8.4.4.