Instruction Manual
D200137X012
3570 Positioners
September 2015
7
Figure 3. Diagnostic Test Connections
12B8044‐A
A6112
PIPE NIPPLE
TO BOTTOM
CYLINDER
PIPE TEE
GAUGE
ACTUATOR
377 TRIP VALVE
(OPTIONAL)
PIPE NIPPLE TO
INSTRUMENT CONNECTION
PIPE NIPPLE
TO SUPPLY
CONNECTION
3570
POSITIONER
BODY PROTECTOR
BODY
PIPE BUSHING
STEM
REQUIRED WHEN
PURCHASED WITH GAUGE
FROM 377
TRIP VALVE
Connections
Piping Sizes
All pressure connections on 3570 positioners are 1/4 NPT (internal). Use 3/8‐inch pipe or tubing for supply, cylinder
(bottom connection), and instrument (input signal) connections. For the remote vent pipe, if one is required, use 19
mm (3/4‐inch) (minimum inside diameter) pipe for runs up to 6.09 meters (20 feet). For vent piping runs from 6.09 to
30.5 meters (20 to 100 feet), use 25.4 mm (1‐inch) (minimum inside diameter) pipe. Refer to figure 4 for the locations
and sizes of connections.
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