APG RP Resistive Chain user manual - Manual (Page 9)

Rev. B3, 10/09 RPE & RPX Series
9
Automation Products Group, Inc.
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• Calibration Procedure (for models equiped with 4-20mA
output option)
R4 R9
ST
I 20
01
R3
R5
J1
R7
R1
R8
D1
R2
C1
C2
D2
C3
Q1
U2
R6
U3
+24vdc
4 to 20ma Out
SPA
N
OF FS ET
RE
D
BLK
WH
OU
T
24V
Offset (20 mA)
Adjustment
Zero (4 mA)
Adjustment
1. Set DC power supply voltage at 24VDC.
2. Connect ammeter in series with loop.
3. Move float to the bottom position
4. Adjust the Offset potentiometer until meter reads 4ma
5. Move float to top position
6. Adjust the Span potentiometer until meter reads 20ma.
7. Repeat steps 3 – 6 for final adjustment.