Emerson 1154 manual Section Calibration, Overview Calibration, Span Adjustment Zero Adjustment

Reference Manual

00809-0100-4514, Rev BA January 2008

Rosemount 1154

Section 3 Calibration

OVERVIEW

CALIBRATION

Span Adjustment

Zero Adjustment

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3-1 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3-1 Calibration Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . page 3-2

Each transmitter is factory calibrated to the range specified by the customer.

This section contains the following transmitter calibration information:

•Calibration

Span Adjustment

Zero Adjustment

•Calibration Procedures

Zero and Span Adjustment

Linearity Adjustment

Damping Adjustment

Correction for High Line Pressure

The Rosemount 1154DP, HP, and GP transmitters are factory calibrated to the range shown on the nameplate. This range may be changed within the limits of the transmitter. Zero may also be adjusted to elevate or to suppress. The span and zero adjustments are external and located under

the nameplate.

The span on any Rosemount 1154 transmitter is continuously adjustable to allow calibration anywhere between maximum span and 1/6 of maximum span (1/4 of maximum span for Range Code 0). For example, the span on a Range Code 4 transmitter can be continuously adjusted between 0–150 and 0–25 inH2O.

The zero can be adjusted for up to 500 percent of span suppression (300 percent for Range Code 0) or 600 percent of span elevation (400 percent for Range Code 0) (see Figure 3-1 on page 3-2).

The zero may be elevated or suppressed to these extremes with the limitation that no applied pressure within the calibrated range exceeds the full-range pressure limit. For example, a Range Code 4 transmitter cannot be calibrated for 150 to 200 inH2O (only 300 percent zero suppression) because the 200 inH2O exceeds the 150 inH2O upper range pressure limit of a Range Code 4.

The transmitter may be calibrated to cross zero, (e.g., –75 to 75 inH2O) but this may result in a slight loss of linearity.

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