Reference Manual
00809-0100-4835 Rev BD
July 2016
Rosemount 3150 Series
3-10
Coarse Zero Select Jumper
Position Selection Procedure
The Coarse Zero Select Jumper (see Figure 3-2) is shipped from the
factory in either the Nominal position or
the position required to obtain
the calibration specified when ordered. Changes to the factory
calibration may require repositioning of the jumper. To do this, follow
the procedure below:
1. Calculate the % zero offset using the following formula:
% Zero Offset = (LRV/URV) X 100
Where:
LRV = Lower Range Value of desired calibration
URL = Transmitter Upper Range Limit
2. Consult Table 3-1 to determine recommended jumper
position.
3. If the jumper requires re-positioning, remove the electronics
housing cover opposite the “Field Terminals” label. Remove
the jumper by squeezing the sides and pulling out.
Reposition the jumper with the arrow pointing to the
recommended position and carefully push in. Ensure both
jumper clips are fully engaged and return to calibration
procedure.
If no change is required, return to calibration procedure.
Figure 3-7 contains an example of determining the recommended
position of the Coarse Zero Select Jumper. Figure 3-7a uses English
Units (inH
2
O) while 3-7b uses SI Units (kPa).
Figure 3-7a – Example for Coarse
Zero Adjustment (English Units)
Range 2 for a calibration of -175 to -125 inH
2
O
LRV = -175 inH
2
O
% Zero Offset = (-175 inH
2
O /250 inH
2
O)*100 = -70%
From Table 3-1, the recommended jumper position is MAX ZE.
Figure 3-7b – Example for Coarse
Zero Adjustment (SI Units)
Range 2 for a calibration of –43,6 to –31,1 kPa
LRV = -43,6 kPa
% Zero Offset = (-43,6 kPa /62,
2
kPa)*100 = -70%
From Table 3-1, the recommended jumper position is MAX ZE.
NOTE
If you remove either cover during the above procedures, follow the
instructions in
Section 5 Maintenance and Troubleshooting
to
reinstall the cover.
Table 3-1 – Coarse Zero Select
(1)
% Zero Offset
Range 1
% Zero Offset
Ranges 2-6
Recommended
Jumper Position
-
60% to 90%
MAX ZS
30% to 90%
20% to 60%
MID ZS
-30% to 30 %
-20% to 20 %
Nominal
-100% to -30%
-60% to -20%
MID ZE
-
-100% to -60%
MAX ZE
(1) % Zero Offset values and jumper positions indicated are
approximations. Select jumper position as needed to achieve the
desired calibration.
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