Instruction Manual
D102005X012
846 Transducer
June 2017
20
6. Repeat steps 4 and 5 to verify and complete the calibration.
7. Turn off the air supply. Remove the module final assembly from the housing. Place the range jumper in the Lo
position for Low Range, as indicated in figure 18. Replace the module final assembly. Turn on the air supply.
8. Apply an input of 12.0 mA (Vm = 3.0 V), and adjust the zero screw to achieve an output of 0.2 bar (3.0 psi).
9. Apply an input of 20.0 mA (Vm = 5.0 V), and note the error (the actual reading versus 15.0 psi). Adjust the span
screw to overcorrect the error by a factor of two. For example, if the reading was 0.9 bar (14.95 psi), adjust the span
screw to achieve an output of 1.1 bar (15.05 psi).
10. Repeat steps 8 and 9 to verify and complete the calibration.
Standard Performance: Full Range Input, Reverse Action
WARNING
Refer to the WARNING at the beginning of the Maintenance section.
Use the following procedure on reverse action units to achieve a 1.0 to 0.2 bar (15 to 3 psi) output span for a 4 to 20
mA input signal:
1. Perform steps 1 through 9 under Standard Performance: Full Range Input, Direct Action, except for step 2. In place
of step 2, confirm that the unit is reverse acting. A blue electronic circuit board identifies reverse‐acting units. Refer
to Action
under the heading Electronic Circuit Board in the Maintenance section for more information on reverse
acting units.
2. Apply an input of 4.0 mA (Vm = 1.0 V), and adjust the zero screw to achieve an output of 1.0 bar (15.0 psi).
3. Apply an input of 20.0 mA (Vm = 5.0 V), and adjust the span screw to achieve an output of 0.2 bar (3.0 psi).
4. Repeat steps 2 and 3 to verify and complete the calibration.
Multirange Performance: Full Range Input, Reverse Action
WARNING
Refer to the WARNING at the beginning of the Maintenance section.
Note
Consult your Emerson sales office
or Local Business Partner for calibration of multirange performance units with split range input.
Use the following procedure with a multirange unit to achieve the desired reverse action output span for a 4 to 20 mA
input signal:
1. Perform steps 1 through 9 of the calibration procedure for Standard Performance: Full Range Input, Direct Action,
except for step 2. In place of step 2, confirm that the unit is reverse acting. A blue electronic circuit board identifies
reverse‐acting units. Refer to Action under the heading Electronic Circuit Board in the Maintenance section for more
information on reverse acting units.
2. Apply an input of 4.0 mA (Vm = 1.0 V), and adjust the zero screw to achieve the desired upper limit of the output
range. The 4 mA point must be between 0.6 and 2.0 bar (9.0 and 30.0 psi). The output increases with clockwise
rotation of the zero screw.
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