Emerson 3051S Especificações descarregar pdf (Página 105)

Reference Manual

00809-0100-4803, Rev DA

Section 4: Operation and Maintenance

April 2013

Operation and Maintenance

Figure 4-3. Calibration - static pressure calibration tab

Zero trim and lower sensor trim

The type of static pressure sensor equipped in the transmitter can be determined by referring to

the Static Pressure Sensor Type heading. This determines whether a zero trim (gage sensor) or

lower sensor trim (absolute sensor) required to correct for mounting position effects.

To perform a zero trim on a gage static pressure sensor, click on the Zero Trim button under the

Static 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.

To correct for mounting position effects on transmitters equipped with an absolute static

pressure sensor, perform a lower sensor trim. This is accomplished by clicking on the Lower

Sensor Trim button and following the on-screen prompts. The lower sensor trim function

provides an offset correction similar to the zero trim function, but it does not require a

zero-based input.

Upper and lower sensor trim

To perform a Static Pressure Full Sensor 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.

Note

It is possible to degrade the performance of the transmitter if the full sensor trim is done

improperly or with inaccurate calibration equipment. Use a pressure input source 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.

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Emerson 3051S Especificações Página 105