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MPR180416 Rev. B
2.6 Analog Output Scaling
•
Level, space and distance have different reference points (See page 21 for reference diagram)
•
Use caution when changing Current Output Function while the device is connected to a HART network. Current
Output Function will update the mA Setpoints.
•
Current Output Function also affects the secondary, tertiary and quaternary variables in a HART network.
Options
Reference Point
Description
Level
Low Calibration Point
Measured as a percentage of the different between High
Calibration Point and Low Calibration Point
Space
High Calibration Point
Distance
Sensor Reference Point
Measured as a percentage of Low Calibration Point
2.6.2 4 mA Setpoint: Sets the process level corresponding to the 4mA value. 4 mA always defaults to 0, and Current
Output Function (2.6.1) determines whether this is a Level, Space or Distance measurement.
Value Range: -999999 to +999999; Defualt 0.00 m
• Enter the reading that is to correspond to 4 mA output
• Units are defined in Units (2.2.1)
2.6.3 20mA Setpoint: Sets the process level corresponding to the 20 mA value. 20 mA always defaults to 100%, and
Current Output Function (2.6.1) determines whether this is a Level, Space or Distance measurement.
Value Range: -999999 to +999999; Defualt 40.00 or 100.0 m
• Enter the reading that is to correspond to 20 mA output
• Units are defined in Units (2.2.1)
2.6.4 Min. mA Limit: Prevents the mA output from dropping below this minimum level for a measurement value. This
does not restrict the Fail-Safe or Manual settings.
Value Range: 3.56 to 22.6 mA; Default 3.80 mA
2.6.5 Max mA Limit: Prevents the mA output from dropping below this maximum level for a measurement value. This
does not restrict the Fail-Safe or Manual settings.
Value Range: 3.56 to 22.6 mA; Default 20.50 mA
2.6.6 mA Output Mode: Can be set to Manual or Auto
Options
Description
Manual
User can enter mA value for loop current.
Auto*
Loop current will follow measurement value.
Fixed
Read only. Loop current is set to the multidrop level of 4 mA. Can
be selected or cancelled only via HART command 6.
2.6.7 Manual Value: Allows you to use a simulated value to test the functioning of the loop. You can enter 4 mA, 20
mA or any other user-defined value within the range.
Value Range: 3.56 to 22.6 mA
1. First set mA Output Mode (2.6.6) to Manual
2. Enter the desired mA value in mA Output Value
3. After completing the test, remember to reset mA Output Mode (2.6.6) to previous setting.
