Emerson Rosemount 2151N Reference Manual page 37

Reference Manual
00809-0000-4851 Rev AD
December 2023
Figure 3-6 – Suppressed Zero
Calibration Example
Figure 3-6a – Example for Suppressed Zero
Calibration (English Units)
Figure 3-6b – Example for Suppressed Zero
Calibration (SI Units)
Calibration
Range 2 with Zero Suppression for a calibration of
20 to 120 inH O (100 inH
2
1. Calibrate the transmitter to 0 to 100 inH
described in the Zero Based Calibration Procedure.
2. Consult Figure 3-8b to help determine typical coarse
zero select jumper position. If necessary, reposition
jumper using the Coarse Zero Select Jumper
Position Selection Procedure.
For this example:
% Zero Offset = (20 inH
Position the jumper to the NOMINAL position.
3. Apply 20 inH O to the high side process connection,
2
and adjust the zero until the transmitter output reads 4
mA. DO NOT USE THE SPAN ADJUSTMENT.
4. Apply 120 inH O to the high side process connection.
2
Verify the output reads 20 mA. If necessary, adjust
the span. Recheck the zero after any span
adjustment.
Range 2 with Zero Suppression for a calibration of
5,0 to 29,9 kPa (24,9 kPa span)
1. Calibrate the transmitter to 0 to 24,9 kPa as described
in the Zero Based Calibration Procedure.
2. Consult Figure 3-8b to help determine typical coarse
zero select jumper position. If necessary, reposition
jumper using the Coarse Zero Select Jumper
Position Selection Procedure.
For this example:
% Zero Offset = (5,0 kPa /62,2 kPa)*100 = 8%
Position the jumper to the NOMINAL position.
3. Apply 5,0 kPa to the high side process connection,
and adjust the zero until the transmitter output reads 4
mA. DO NOT USE THE SPAN ADJUSTMENT.
4. Apply 29,9 kPa to the high side process connection.
Verify the output reads 20 mA. If necessary, adjust
the span. Recheck the zero after any span
adjustment.
Rosemount 2151N
O span)
2
O as
2
O /250 inH O)*100 = 8%
2 2
28