Emerson Rosemount 2151N Reference Manual page 36

Rosemount 2151N
Figure 3-5b – Example for Elevated Zero
Calibration (SI Units)
27
Range 2 with Zero Elevation for a calibration of
–29,9 to –5,0 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 = (-29,9 kPa /62,2 kPa)*100 = -48%
Position the jumper to the MID ZE position.
3. Apply -29,9 kPa to the high side process connection
(as marked on the transmitter sensor module) and
adjust the zero until the transmitter output reads 4mA.
DO NOT USE THE SPAN ADJUSTMENT.
NOTE
Applying 29,9 kPa to the low side process connection (as
marked on the transmitter module) will give the same result.
4. Apply -5,0 kPa to the high side process connection
(as marked on the transmitter sensor module). Verify
the output reads 20 mA. If necessary, adjust the
span. Recheck the zero after any span adjustment.
NOTE
Applying 5,0 kPa to the low side process connection (as
marked on the transmitter module) will give the same result.
Reference Manual
00809-0000-4851 Rev AD
December 2023
Calibration