Reference Manual
00809-0100-4690, Rev FC
June 2011
4-9
Rosemount 2088 and 2090
Zero Trim NOTE
The transmitter must be within three percent of true zero (zero-based) in order
to calibrate with zero trim function.
Field Communicator
Calibrate the sensor with a Field Communicator using the zero trim function
as follows:
1. Vent the transmitter and attach a Field Communicator to the
measurement loop.
2. From the HOME screen, follow the fast key sequence “Zero Trim.”
3. Follow the commands provided by the Field 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.
Sensor 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.
Field Communicator
To calibrate the sensor with a Field Communicator using the sensor trim
function, perform the following procedure:
1. Assemble and power the entire calibration system including a
transmitter, Field Communicator, power supply, pressure input source,
and readout device.
2. From the HOME screen, enter the fast key sequence under “Sensor
Trim.”
3. Select 2: Lower sensor trim. The lower sensor trim value should be the
sensor trim point that is closest to zero.
Examples:
Calibration: 0 to 100 inH
2
O - lower trim = 0, upper trim = 100
Calibration: -100 to 0 inH
2
O - lower trim = 0, upper trim = -100
Calibration: -100 to 100 inH
2
O - lower trim = -100 or 100,
upper trim = -100 or 100
4-20 mA Fast Keys
1, 2, 3, 3, 1
4-20 mA Fast Keys
1, 2, 3, 3
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