Emerson Series 3000 MVD User Manual
Configuration and Use Manual
53
Configuring Inputs
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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.
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.
When setting cutoffs, keep the following points in mind:
•
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.
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.
•
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.
below its configured cutoff value, the volume flow rate will go to zero.
•
Both mA outputs have cutoffs (see Section 8.4.4). If the mA outputs are configured for mass or
volume flow, and these cutoffs are set to a greater value than the mass and volume cutoffs, the
flow indicators will go to zero when the mA cutoff is reached. If the mA cutoffs are 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.
volume flow, and these cutoffs are set to a greater value than the mass and volume cutoffs, the
flow indicators will go to zero when the mA cutoff is reached. If the mA cutoffs are 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.
Be sure to set cutoff values accordingly.
7.3.3
Sensor calibration data
Note: This section is not applicable to the Model 3300 or Model 3350 controller.
Sensor calibration data describe the sensor’s sensitivity to flow, density, and temperature. The term
“characterization” is frequently used to refer to the process of configuring the transmitter with this
information. The characterization procedure depends on whether or not the transmitter is currently
attached to a sensor, and if it is, the sensor type:
“characterization” is frequently used to refer to the process of configuring the transmitter with this
information. The characterization procedure depends on whether or not the transmitter is currently
attached to a sensor, and if it is, the sensor type:
T-Series
or
Other
.
•
If a sensor is currently attached, the transmitter will automatically display the appropriate
calibration parameters for the sensor type.
calibration parameters for the sensor type.
•
If no sensor is currently attached, you must select
T-Series Setup
and specify:
-
Yes
– if you want to configure T-Series calibration factors
-
No
– if you want to configure calibration factors for any other sensor
See Figure 7-1 for a list of the sensor calibration parameters required for your sensor.
Preconfigured calibration data
If the core processor and sensor in your Series 3000 system were ordered together, then the flowmeter
has already been characterized. You need to characterize the flowmeter only if the core processor and
sensor are being paired together for the first time.
has already been characterized. You need to characterize the flowmeter only if the core processor and
sensor are being paired together for the first time.
Calibration data on sensor tags
The characterization parameters are provided on the sensor tag. The format of the sensor tag varies
depending on your sensor’s date of purchase. See Figures 7-5 and 7-6 for illustrations of newer and
older sensor tags.
depending on your sensor’s date of purchase. See Figures 7-5 and 7-6 for illustrations of newer and
older sensor tags.
Note: On some sensors, the Temperature Coefficient (DT) is shown as TC.