Instruction Manual
D200137X012
3570 Positioners
September 2015
6
Figure 2. Bias and Range Springs for Zero and Span Adjustments
AJ7270‐C
1H8907‐C
1J2233‐C
B2402
ZERO ADJUSTMENT
EFFECTIVE LENGTH
EFFECTIVE LENGTH
OVERALL
LENGTH
SPRING LOCK
BELLOWS
BEAM TRAVEL
STOP (E‐RING)
BEAM
SPRING RETAINER SPACER
SPRING RETAINER SPACER
(IF REQUIRED) (KEY 235)
SPRING RETAINER
(KEY 19)
RANGE SPRING
(KEY 18)
(OPTIONAL)
PISTON ROD EXTENSION
LOCKNUTS
SPRING
RETAINER
BIAS SPRING
BIAS SPRING POST
NOTE:
BOTTOM OF BIAS SPRING POST THREAD MUST BE POSITIONED
AS SHOWN FOR PROPER POSITION OF E‐RING TRAVEL STOPS.
Diagnostic Test Connectors (Optional)
Diagnostic test connectors are available from the factory, when the unit is ordered, or they can be installed on an
existing control valve assembly in the field. These connectors are especially useful for “quick” connections when using
the FlowScannert valve diagnostic system. The FlowScanner is a portable, microprocessor‐based diagnostic and
calibration system specifically designed for use with pneumatically‐operated control valves.
To support diagnostic testing of the control valve assembly, the connectors, piping, and other hardware can be
installed between the 3570 positioner and the actuator. A typical connector installation is shown in figure 3. For
connectors, refer to the FlowScanner Diagnostic Connection kit listing in the parts list.
The hardware used includes 3/4 NPT pipe nipple, pipe tee, and pipe bushings with a 1/8 NPT pipe bushing for the
connector. The connector consists of 1/8 NPT body and body protector (see figure 3).
1. Before assembling the pipe nipple, pipe tee, pipe bushings, actuator piping, and connector body, apply sealant to
all threads.
2. Position the pipe tee, connector body, and body protector for easy access when doing diagnostic testing.
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