Linearity - Emerson Rosemount 2151N Reference Manual

Rosemount 2151N
Figure 3-12 – High Static Line
Pressure Zero Correction Example

Linearity

39
d. Apply the intended line pressure to high and
low sides (zero differential pressure).
e. Record the output reading.
f. Subtract the reading in step e from the reading
in step c. Note the sign associated with the
calculated value, as the sign is maintained for
the adjustment in step i.
g. Calibrate the transmitter to the desired
calibration using the Elevated or Suppressed
Zero Calibration Procedure.
h. For range codes 4 and 5 only, correct for
static pressure span effect as described in
Static Pressure Span Correction for Range
Code 4 and 5 DP Transmitters.
i. Apply pressure equal to the LRV (zero line
pressure), adjust the zero by the amount
calculated in step f.
Figure 3-12 outlines an example of a Zero Correction for High
Static Line Pressure for a transmitter with a non-zero based
calibration.
If -0.007 mA was calculated in step f and the LRV reads 4.002
mA, adjust the zero until the LRV reads 3.995 mA. DO NOT
ADJUST THE SPAN. When static pressure is applied, the
output should read 4.002 mA.
Linearity is factory optimized and requires no field adjustment.
Reference Manual
00809-0000-4851 Rev AD
December 2023
Calibration