Emerson 3051S Specifications Page 103

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13
Reference Manual
00809-0100-4803, Rev DA
Section 4: Operation and Maintenance
April 2013
Operation and Maintenance
4.3.3 Differential pressure sensor calibration
The Differential Pressure Calibration Tab allows the user to complete a zero trim procedure or a
full DP sensor trim, see Figure 4-2.
Figure 4-2. Calibration - differential pressure calibration tab
Zero trim
To perform a DP sensor zero trim, click on the Zero Trim button under the Differential Pressure
Sensor Trim heading and follow the on-screen prompts. The transmitter must be within five
percent or less of the maximum span of true zero (zero-based) in order to calibrate with zero
trim function.
Note
When performing a DP sensor zero trim, ensure that the equalizing valve is open and all wet legs
are filled to the correct levels.
Upper and lower sensor trim
A reference pressure device is required to perform a full sensor trim. Use a reference pressure
device that is at least three times more accurate than the transmitter and allow the pressure
input to stabilize for ten seconds before entering any values. It is possible to degrade the
performance of the transmitter if the full sensor trim is done improperly or with inaccurate
calibration equipment.
To perform a DP full trim, first click on the Lower Sensor Trim button and follow the on-screen
prompts. Next, click on the Upper Sensor Trim button and follow the on-screen prompts.
Mass and Energy Flow Fast Keys 1, 2, 5, 3
Direct Process Var. Output Fast Keys 1, 2, 4, 3
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