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38 Micro Motion
®
Model 1500 Transmitters with the Filling and Dosing Application
Optional Transmitter Configuration
8. Define the standard density to be used in calculations.
• To use a fixed standard density, click the top radio button, enter a value for standard
density in the
Standard Density textbox, and click Next.
• To use a calculated standard density, click the second radio button and click
Next. Then
enter values for
Reference Temperature, Reference Pressure, and Specific Gravity on
the next panel, and click
Next.
9. Check the values displayed.
• If they are appropriate for your application, click
Finish. The special unit data will be
written to the transmitter.
• If they are not appropriate for your application, click
Back as many times as necessary to
return to the relevant panel, correct the problem, then repeat the above steps.
6.5 Configuring cutoffs
Cutoffs are user-defined values below which the transmitter reports a value of zero for the specified
process variable. Cutoffs can be set for mass flow, volume flow, or density.
See Table 6-1 for cutoff default values and related information. See Sections 6.5.1 and 6.5.2 for
information on how the cutoffs interact with other transmitter measurements.
6.5.1 Cutoffs and volume flow
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.
However, the density cutoff is applied to the volume flow calculation. Accordingly, if the density
drops below its configured cutoff value, both the reported density and the reported volume flow rate
will go to zero.
6.5.2 Interaction with the AO cutoff
The mA output also has a cutoff – the AO cutoff. If the mA output is configured for mass or volume
flow:
• And the AO cutoff is set to a greater value than the mass and volume cutoffs, the flow
indicators will go to zero when the AO cutoff is reached.
• And the AO cutoff is set to a lower value than the mass or volume cutoff, the flow indicator
will go to zero when the mass or volume cutoff is reached.
See Section 4.5.3 for more information on the AO cutoff.
Table 6-1 Cutoff default values
Cutoff type Default Comments
Mass flow 0.0 g/s Recommended setting: 0.5–1.0% of the sensor’s rated maximum flowrate
Volume flow 0.0 L/s Lower limit: 0
Upper limit: the sensor’s flow calibration factor, in units of L/s, multiplied by 0.2
Density 0.2 g/cm
3
Range: 0.0–0.5 g/cm
3