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Reference Manual
00809-0100-4027, Rev AA
December 2005
Rosemount 4500
4-6
Zero Trim NOTE
The transmitter must be within three percent of true zero (zero-based) in order
to calibrate with zero trim function.
HART Communicator
Calibrate the sensor with a HART Communicator using the zero trim function
as follows:
1. Vent the transmitter and attach a HART Communicator to the
measurement loop.
2. From the HOME screen, follow the fast key sequence for “Zero Trim.”
3. Follow the commands provided by the HART Communicator to complete
the zero trim adjustment.
AMS
Right click on the device and select “Calibrate,” then “Zero trim” from the
menu
.
1. Click Next after setting the control loop to manual.
2. Click Next to acknowledge warning.
3. Click Next after applying appropriate pressure to sensor.
4. Select Next to acknowledge the loop can be returned to automatic
control.
5. Select Finish to acknowledge the method is complete.
Full Trim NOTE
Use a pressure input source that is at least three times more accurate than
the transmitter, and allow the input pressure to stabilize for ten seconds
before entering any values.
HART Communicator
To calibrate the sensor with a HART Communicator using the full trim
function, perform the following procedure:
1. Assemble and power the entire calibration system including a
transmitter, HART Communicator, power supply, pressure input source,
and readout device.
2. From the HOME screen, enter the fast key sequence below for “Full
Trim.”
3. Select 2: Lower sensor trim
Fast Keys
1, 2, 3, 3, 1
Fast Keys
1, 2, 3, 3