Robertshaw P2 Quick Start Manual

GENERAL DESCRIPTION
The Model P2 Pilot Positioner is a positive positioning relay
for use with pneumatically operated valves and actuators.
This unit positions the valve, correcting for such factors as
stem friction or valve loading by sensing the true stem
position through the feedback lever and utilizing as much of
its independent air supply as is necessary to achieve the true
valve position represented by a 3 to 15 psig (0.2 to 1.0 bar)
instrument pressure.
The positioner is sturdily constructed of aluminum and
stainless steel with Buna-N nylon diaphragms to ensure a
long, trouble-free operating life.
SPECIFICATIONS
Action: ...................................... Proportional, Direct-Acting.
Supply Air Pressure:
Nominal ................................................18 psig (1.25 bar)
Maximum ...............................................30 psig (2.0 bar)
Instrument Pressure: .................. 0 to 15 psig (0 to 1.0 bar)
Adjustments:
Throttling Range ................. Field adjustable 3 to 12 psig
Start Point ........................... Field adjustable 3 to 12 psig
Repeatability: ......................................... 0.9% of full range.
Maximum Air Consumption: .............................3.5 SCFH.
GENERAL INSTRUCTIONS
TO BE USED ON CONTROL AIR ONLY. DO NOT
USE ANY OTHER MEDIUM.
1. This positioner will operate properly when mounted
in any position.
2. Do not remove the protective plastic plugs until
just before making the connections.
3. Feedback springs are designed for specific valve strokes
(See table below). If it should be necessary to move this
positioner to a valve having a different stroke, care
should be taken to use the correct spring. Springs may
be obtained from the factory by ordering part number
listed.
VALVE STROKE
SPRING
COLOR CODE
(0.2 to 0.8 bar)
(0.2 to 0.8 bar)
1/4" to 3/8" 7/16" to 5/8"
(6.4 to 9.5 mm) (11 to 15.9 mm)
29448-A1 29448-B1
BLACK NONE
PRODUCT SPECIFICATION P2
ORDERING INFORMATION
Specify:
1. Model Number.
2. Serial Number of Control Valve to
which it is mounted.
11/16" to 1" 1-1/16" to 1-7/16"
17.5 to 25.4 mm) (27 to 36.5 mm)
29448-C1
ORANGE
1
Sales Manual Section 170
Side Mounted
Valve Positioner
Model P2
1-1/2" to 2"
(38 to 50.8 mm)
29448-D1 29448-E1
RED WHITE