Model P91PA Poweractor Power Positioner - Invensys

PSS 4-10A1 B
Page 2
REVERSIBLE POSITIONER OUTPUT
Positioner output may be reversed from increasing
output to decreasing output by simply inverting the
positioner and changing the length of the spring
holder and stud.
SMOOTH, FAST OPERATION
The close tolerance, micro-finished pilot valve
provides the smooth operation required for fast
action, with a minimum of moving parts.
Accuracy
Positions to better than 1% of total stroke
Sensitivity
Response to signal pressure change of less than 1inch
water pressure
Temperature Limits
–29 to +320°C (–20 to +160°F)
Ambient Temperature Effect
1/2% on output for 55°C (100°F) change
Input Signal
20 to 100 kPa (3 to 15 psi)
Air Supply
1035 kPa (150 psi) maximum
Output Signal
Up to maximum air supply pressure
Relay Bleed Rate
1.3 m 3 /h (0.75 scfm) at 350 kPa (50 psi)
Air Delivery at Standard Conditions (See Table
Below)
For an Air Supply
Pressure of The Air Delivery is
KPa psi m 3 /h scfm
410
620
60
90
12.6
17
STANDARD SPECIFICATIONS
7.4
10
RUGGED CONSTRUCTION
Stroke-force spring is high-quality spring steel wire,
cadmium plated for corrosion resistance. Mechanism
is completely enclosed in weatherproof, gasketed
case.
EASY STROKE AND ZERO ADJUSTMENT
Only a screwdriver is required to change the ratio of
piston movement to input signal, or to adjust zero.
Stroke
Up to 762 mm (30 in)
Case
Cast aluminum
Cover
Cast aluminum, gasketed
Finish
Black enamel, infrared baked
Mounting
FACTORY
With plate bracket and actuating arm for assembly
to MAC Series cylinder
FIELD
With clamp bracket for 25 mm (1 in) hexagonal
column, or 33.3 mm (1.31 in) diameter rod
Stud Length
54 mm (2.125 in), other lengths available to 305 mm
(12 in)
Connections
1/4 NPT
Weight
Approximately 3.2 kg (7 lb)