Emerson 00809-0100-4514, 1154 manual Calibration Procedures, Zero and Span Adjustment

Rosemount 1154

Reference Manual

00809-0100-4514, Rev BA January 2008

Figure 3-1. Zero Adjustment Range.

						20
		600% Zero Elevation				Output
						(mA)
						4
–150	–125	–100 –75	–50	–25	0	25

Pressure (inH2O)

600% Zero Elevation➀

20

Output (mA)

4

0 25

Pressure (inH2O)

No Zero Elevation or Suppression➀

	20
Output
(mA)	4
	0	25	50	75	100	125	150

Pressure (inH2O)

500% Zero Suppression➀

➀Graphs based on a Range Code 4 (0–25 to 0–150 inH2O) Rosemount 1154 with a calibrated span of 25 inH2O.

CALIBRATION PROCEDURES

Zero and Span Adjustment

NOTE

The Rosemount 1154 Pressure Transmitter contains electronic circuit boards which may be static sensitive.

NOTE

Covers need not be removed for zero and span adjustment.

The zero and span adjustment screws are accessible externally. They are located behind the nameplate on the side of the electronics housing (see Figure 3-2 on page 3-3). The transmitter output increases with clockwise rotation of the adjustment screws.

The zero adjustment screw has very little effect on the span. The span adjustment, however, does affect the zero. The effect of interaction is more apparent with suppression or elevation. The span adjustment changes the zero output and the full-scale output by approximately the same percentage. Therefore, it is best to calibrate the transmitter from zero to the desired span and finish the calibration by adjusting the zero screw to achieve the desired elevation or suppression.

3-2