Emerson 3051S Specifications download pdf (Page 91)

Reference Manual

00809-0100-4001, Rev JA

Section 4: Operation and Maintenance

November 2012

Operation and maintenance

AMS Device Manager

Right click on the device and select Calibrate, then Recall Factory Trim from the menu.

1. Click Next after setting the control loop to manual.

2. Select Analog output trim under Trim to recall and click Next.

3. Click Next to acknowledge restoration of trim values is complete.

4. Select Next to acknowledge the loop can be returned to automatic control.

5. Select Finish to acknowledge the method is complete.

4.5 Sensor trim

4.5.1 Sensor trim overview

Trim the sensor using either sensor or zero trim functions. Trim functions vary in complexity and

are application-dependent. Both trim functions alter the transmitter’s interpretation of the

input signal.

Zero trim is a single-point offset adjustment. It is useful for compensating for mounting position

effects and is most effective when performed with the transmitter installed in its final mounting

position. Since this correction maintains the slope of the characterization curve, it should not be

used in place of a sensor trim over the full sensor range.

When performing a zero trim, ensure that the equalizing valve is open and all wet legs are filled

to the correct levels.

Note

Do not perform a zero trim on Rosemount 3051T Absolute pressure transmitters. Zero trim is

zero based, and absolute pressure transmitters reference absolute zero. To correct mounting

position effects on a 3051T Absolute Pressure Transmitter, perform a low trim within the sensor

trim function. The low trim function provides an offset correction similar to the zero trim

function, but it does not require zero-based input.

Sensor trim is a two-point sensor calibration where two end-point pressures are applied, and all

output is linearized between them. Always adjust the low trim value first to establish the correct

offset. Adjustment of the high trim value provides a slope correction to the characterization

curve based on the low trim value. The trim values allow you to optimize performance over your

specified measuring range at the calibration temperature.

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Emerson 3051S Specifications Page 91