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Reference Manual
00809-0100-4027, Rev AA
December 2005
3-7
Rosemount 4500
CHECK OUTPUT Before performing other transmitter on-line operations, review the digital
output parameters to ensure that the transmitter is operating properly and is
configured to the appropriate process variables.
Process Variables The process variables for the 4500 provide transmitter output, and are
continuously updated. The pressure reading in both engineering units and
percent of range will continue to track with pressures outside of the defined
range from the lower to the upper range limit of the Transmitter.
HART Communicator
The process variable menu displays the following process variables:
• Pressure
• Percent of range
• Analog output
• Sensor temperature
• Scaled Variable (SV)
NOTE
Regardless of the range points, the 4500 will measure and report all readings
within the digital limits of the sensor. For example, if the 4 and 20 mA points
are set to 0 and 100 psi, and the transmitter detects a pressure of 150 psi, it
digitally outputs the 150 psi reading and a 150% of span reading. However,
there may be up to ±5.0% error associated with output outside of the
range points.
AMS
Right click on the device and select “Process Variables...” from the menu.The
process variable screen displays the following process variables:
• Pressure
• Percent of range
• Analog output
• Sensor temperature
• Scaled Variable (SV)
Sensor Temperature The 4500 contains a temperature sensor near the pressure sensor in the
Transmitter. When reading this temperature, keep in mind the sensor is not a
process temperature reading.
HART Communicator
Enter the fast key sequence for “Sensor Temperature” to view the sensor
temperature reading.
AMS
Right click on the device and select “Process Variables...” from the menu.
“Snsr Temp” is the sensor temperature reading.
Fast Keys
1, 1
Fast Keys
1, 1, 4