Standard Performance: Split Range Input, Direct Action; To 12 Ma Input Signal; 12 To 20 Ma Input Signal; Standard Performance: Full Range Input, Reverse Action - Emerson Fisher 846 Instruction Manual

Instruction Manual
Form 5739
February 2002
Standard Performance: Split Range
Input, Direct Action

4 to 12 mA Input Signal

Use the following calibration procedure to produce a
0.2 to 1.0 bar (3 to 15 psi) output span 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.
2. Apply an input of 4.0 mA (V
adjust the zero screw to achieve an output of 0.2 bar
(3.0 psi).
3. Apply an input of 12.0 mA (V
adjust the span screw to achieve an output of 1.0
bar (15.0 psi).
4. Repeat steps 2 and 3 to verify and complete the
calibration.

12 to 20 mA Input Signal

Use the following calibration procedure to produce a
0.2 to 1.0 bar (3 to 15 psi) output span for a 12 to 20
mA input signal:
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.
2. Apply an input of 4.0 mA (V
adjust the zero screw to achieve an output of 0.2 bar
(3.0 psi).
3. Apply an input of 12.0 mA (V
adjust the span screw to achieve an output of 1.0
bar (15.0 psi).
4. Maintain the input of 12.0 mA (V
adjust the zero screw to achieve an output of 0.2 bar
(3.0 psi). The unit may not turn down this low; if it
does not, go to step 7.
5. If the output reaches 0.2 bar (3.0 psi) in step 4,
apply an input of 20.0 ma (V
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).
= 1.0 V), and
m
= 3.0 V), and
m
Note
= 1.0 V), and
m
= 3.0 V), and
m
= 3.0 V), and
m
= 5.0 V) and note the
m
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 6-5. Replace the module final assembly. Turn
on the air supply.
8. Apply an input of 12.0 mA (V
adjust the zero screw to achieve an output of 0.2 bar
(3.0 psi).
9. Apply an input of 20.0 mA (V
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
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 red electronic circuit board
identifies reverse-acting units. Refer to Action under
the heading Electronic Circuit Board in Section 6
for more information on reverse acting units.
2. Apply an input of 4.0 mA (V
the zero screw to achieve an output of 1.0 bar (15.0
psi).
3. Apply an input of 20.0 mA (V
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
(2)
Input , Reverse Action
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 red
Calibration
= 3.0 V), and
m
= 5.0 V), and
m
= 1.0 V), and adjust
m
= 5.0 V), and
m
3–3