Dwyer 265NR User Manual download pdf

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: info@dwyermail.com

Series 265NR PRECISOR

II Pneumatic Rotary Positioner

Specifications - Installation and Operating Instructions

Bulletin F-93

-1/2

[

165.51]

-3/8

[

59.99]

3/8

[10.01]

[25.00]

-5/8

[

91.49]

(

8) M8X1.25P

(

4) M8X1.25P

2-3/4

[70.00]

3-1/4

[83.01]

-5/8

[

40.00]

-3/8

[

60.01]

2-1/2

[65.02]

7-1/4

[184.00]

1 2

Series 265NR PRECISOR 1

Summary of Contents

Page 1 - Series 265NR PRECISOR

The Series 265NR PRECISOR®II Pneumatic Positioner isused for pneumatic valve actuators by means of pneumaticcontroller or control systems

Page 2

BLOCK DIAGRAMINSTALLATIONConnection with Feedback Shaft - Attach to the position at whichthe positioner feedback shaft and the rotary actuator main sh

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Dwyer 265NR User Manual

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