Elevated Or Suppressed Zero Calibration Procedure - Emerson Rosemount 2151N Reference Manual

Rosemount 2151N
Figure 3-4b – Example for Zero Based
Calibration (SI Units)
Elevated or Suppressed Zero
Calibration Procedure
25
Range 2 for a calibration of 0 to 24,9 kPa (24,9 kPa span)
1. Adjust the zero: With 0 kPa applied to the transmitter,
turn the Zero adjustment until the transmitter reads 4
mA.
2. Adjust the span: Apply 24,9 kPa to the transmitter
high side connection. Turn the Span adjustment until
the transmitter output reads 20 mA.
3. Check to assure desired outputs are achieved and
repeat steps 1 and 2 if necessary.
The easiest way to calibrate a 2151N pressure transmitter with
an elevated or suppressed zero is to perform a zero-based
calibration and then elevate or suppress the zero by adjusting
the zero adjustment screw and, if necessary, the coarse zero
select Jumper.
NOTE
For large amounts of elevation or suppression, it may be
necessary to reposition the coarse zero select jumper.
Procedures for re-positioning the jumper are described in the
Coarse Zero Select Jumper Position Selection Procedure.
Figures 3-5 and 3-6 contain examples of calibrating a
transmitter with an Elevated Zero and Suppressed Zero
calibration respectively. Figures 3-5a and 3-6a use English
units (inH2O) while Figures 3-5b and 3-6b use SI units (kPa).
Reference Manual
00809-0000-4851 Rev AD
December 2023
Calibration