Instruction Manual
D102005X012
846 Transducer
June 2017
21
3. Apply an input of 20.0 mA (Vm = 5.0 V), and adjust the span screw to achieve the desired lower limit of the output
range. The span must be at least 0.7 bar (11.0 psi). The lower limit of the 20.0 mA setting is 0.03 bar (0.5 psi). The
output increases with clockwise rotation of the span screw.
4. Repeat steps 2 and 3 to verify and complete the calibration.
Standard Performance: Split Range Input, Reverse Action
WARNING
Refer to the WARNING at the beginning of the Maintenance section.
4 to 12 mA Input Signal
Use the following procedure on reverse action units to achieve a 1.0 to 0.2 bar (15 to 3 psi) output signal for a 4 to 12
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 an output of 1.0 bar (15.0 psi).
3. Apply an input of 12.0 mA (Vm = 3.0 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.
12 to 20 mA Input Signal
Use the following procedure on reverse action units to achieve a 1.0 to 0.2 bar (15 to 3 psi) output signal for a 12 to 20
mA input signal:
Note
There may be some span interaction with zero in this range, and the following steps compensate for this.
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 action. 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 12.0 mA (Vm = 3.0 V), and adjust the span screw to achieve an output of 0.2 bar (3.0 psi).
4. Maintain the input of 12.0 mA (Vm = 3.0 V), and adjust the zero screw to achieve an output of 1.0 bar (15.0 psi). The
unit may not turn up this high; if it does not, go to step 7.
5. If the output reaches 15.0 psi in step 4, apply an input of 20 mA, and adjust the span screw to achieve a 3.0 psi
output. Apply an input of 20 mA (Vm = 5.0 V), and note the error (the actual reading versus 3.0 psi). Adjust the span
screw to overcorrect the error by a factor of two. For example, if the reading was 2.95 psi, adjust the span screw to
achieve an output of 3.05 psi.
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