Dwyer 265NR - Manual

The Series 265NR PRECISOR ® II Pneumatic Positioner is
used for pneumatic valve actuators by means of pneumatic
controller or control systems with an output signal of 3 to 15 psi
or split ranges.
FEATURES
• Perform 1/2 split control without any other substitutes.
• Easy to adjust zero and span.
• Easy to convert from Reverse Action to Direct Action or vice
versa.
• Easy to protect from hunting effect by using output orifice in
small size actuator.
• Easy feedback connection.
• Fast and accurate response.
• Low air consumption.
• Easy installation.
• Designed as block build structure for maintenance and repair.
• Proved the reliability through over 500,000 times of Repeat
Test and Vibration Test.
• Superior anti-corrosion by special surface treating.
OPERATING PRINCIPLES
Increase the input signal to change lift position of valve. Force
exerted by (1) Torque Motor reduces Nozzle Back Pressure
with increase in gap between between (2) Flapper and (3)
Nozzle. Then (5) Spool moves upward and the seat opens
simultaneously. Air pressure of OUT1 pipe is discharged to (10)
Actuator. As pressure in the actuator chamber goes up, (12)
Actuator Stem start to move. The movement of (12) Actuator
Stem exerted force to the (a) Feedback Spring through
Feedback Shaft connections. Then (10) Actuator will stop at the
point of force balance exerted by the input current signal and
the feedback spring.
SPECIFICATIONS
Input Signal: 3 to 15 psig (0.2 to 1 bar).
Material: Aluminum diecasting.
Air Supply: 20 to 100 psig (1.4 to 6.9 bar).
Air Supply Connection: 1/4˝ NPT.
Gage Connection: 1/8˝ NPT.
Linearity: ±2% of FS.
Hysteresis: 1% of FS.
Sensitivity: ±0.5% of FS.
Repeatability: ±0.5% of FS.
Air Consumption: 0.10 scfm (3 LPM) at 20 psig (1.4 bar)
supply.
Flow Capacity: 28 scfm (80 LPM) at 20 psig (1.4 bar) supply.
Stroke: 0 to 90°.
Enclosure Rating: IP66.
Operating Temperature: -4 to 160°F (-20 to 70°C).
Weight: 3.1 lb (1.7 kg).
PROXIMITY DIV., DWYER INSTRUMENTS, INC.
P.O. BOX 358 • MICHIGAN CITY, INDIANA 46360 U.S.A.
Phone: 219/879-8000 www.dwyer-inst.com
Fax: 219/872-9057 e-mail: [email protected]
Series 265NR PRECISOR ® II Pneumatic Rotary Positioner
Specifications - Installation and Operating Instructions
Bulletin F-93
6-1/2
[165.51]
2-3/8
[59.99]
3/8
[10.01]
1
[25.00]
3-5/8
[91.49]
(8) M8X1.25P
(4) M8X1.25P
2-3/4
[70.00]
3-1/4
[83.01]
1-5/8
[40.00]
2-3/8
[60.01]
2-1/2
[65.02]
7-1/4
[184.00]