APG RPM Explosion Proof Resistive Chain user manual - Manual (Page 10)

RPM Series Rev. D6, 10/09
10
Automation Products Group, Inc.
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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 the meter reads 20ma.
7. Repeat steps 3 – 6 for final adjustment.
• Analog Calibration Procedure (for models equipped with 4-
20 mA conversion board)
Choose Loop Resistance
to match application
4.25
Ammeter
COM mA
Power Supply
(24Vdc)
+ -
R4 R9
ST I 20 01
R3
R5
J1
R7
R1
R8
D1
R2
C1
C2
D2
C3
Q1
U2
R6
U3
SPA
N
OF FSET
RED
BL K WH
OU T 24V
4 to 20ma Out
+24vdc