Dwyer 265NR User Manual

Bulletin F-93

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59.99]

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8) M8X1.25P

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40.00]

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Series 265NR PRECISOR®II Pneumatic Rotary Positioner

Specifications - Installation and Operating Instructions

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.

PROXIMITY DIV., DWYER INSTRUMENTS, INC.

P.O. BOX 358 • MICHIGAN CITY, INDIANA 46360 U. S . A.

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).

Phone: [phone] www.dwyer-inst.com
Fax: [phone] e-mail: [e-mail]

BLOCK DIAGRAM

INSTALLATION
Connection with Feedback Shaft - Attach to the position at which

the positioner feedback shaft and the rotary actuator main shaft are
almost concentric (range in which the spring pin of feedback shaft
edge enters the hole of fork assembly shaft edge).

Cam Attaching Procedure - Use the DA face of cam to turn the
actuator main shaft clockwise (viewed from the positioner front cover
side) at the time of input use the RA face to turn it counterclockwise
(reverse action). Correctly attach the cam to the flange part of
feedback shaft. Attach the cam in the procedure of loosening the
hexagonal nut with flange first, setting the using actuator to the
starting position and then setting the cam reference line and the
bearing contact point of span adjusting arm unit to the matching
position. DO NOT apply the supply pressure when attaching the cam
as otherwise it is very dangerous. When the positioner is shipped
out, the cam is tentatively tightened to the shaft. Be sure to firmly
lock the cam to the lock nut [tightening torque 2.0 to 2.5 Nm (20 to
25 kgfcm)].

of a Series AFR Air Filter Regulator connects to actuator. After using,
return switch to “A”. Not available for single acting - OUT2 and
double acting.

Seat Adjuster - No need to adjust in the field because seat adjuster
is to be adjusted before shipment for balanced pressure point of
output pressure. Seat adjuster is always used for double-acting. If
need to change balanced pressure point of output pressure, use
seat adjuster. If the sensitivity is poor because of the actuator type
of load condition, turn the seat adjuster screw clockwise. (The
amount of turning varies by actuators. Do not loosen the stopper
screw at this time since it is set to avoid the screw coming off.)

AIR PIPING CONDITIONS

Fully purge the pipe to remove foreign matter. Use a clean air supply
fully removed of humidity and dust. Use a Series AFR filter regulator
to keep supply air pressure constant. When using the double acting
type as the single acting type, blind either OUT1 or OUT2 and also
remove the pressure gauge to close its connection.

AIR PIPING DIAGRAM

ADJUSTMENT PROCEDURE
Zero Adjustment - Set input signal to the Stroke starting signal (3

psi) then turn the zero adjuster clockwise or counterclockwise. In
case of spring actuator, check if it is set to standard pressure in zero
point. If not, repeat zero adjustment.

Span Adjustment - Turn and adjust span adjustment screw so that
indicator reaches at final stroke point by final input signal. Check
zero point and repeat zero span adjustment. 1/2 split range can be
used by zero and span adjustment. After setting, tighten up lock
screw of span adjustment.

Auto/Manual Switch - This is a switch for changing auto and
manual. Shipped products are set for auto. To use manual operation,
turn A/M switch counterclockwise. In manual operation, the pressure

©Copyright 2014 Dwyer Instruments, Inc. Printed in U.S.A. 4/14 FR# RV-443333-30 Rev. 3

MAINTENANCE

If the supply air is fouled, the positioner may not operate normally.
Periodically check the compressed air cleaning system and make
sure that clean air is always supplied. When disassembling the pilot
valve, coat grease to the O-ring of the sliding section. When the fixed
orifice is clogged with the carbon particles or others, remove the pilot
valve auto/manual changeover screw (built-in fixed aperture) and
clean it by inserting a 0.2 mm wire into the aperture. If it must be
replaced with a new one, stop the supply pressure and remove the
stopper screw of the pilot valve. Check the positioner once a year.
Treatment at an early stage is especially important if the positioner
is used in severe environments, like coastal areas.

In the unlikely event the 265NR Series Positioner should fail, the unit
can be returned to the factory for warranty repair if the warranty
period has not expired. Contact our customer service department for
a return goods authorization (RGA) number and to setup the return.

WARNING: Do not apply large vibration or impact to the positioner.
The positioner must be handled very carefully during transportation
and operation. If the positioner is used at temperatures outside of
the specification, the sealing materials deteriorate quickly and also
the positioner may not operate normally. Use clean supply air fully
removed of humidity and dust. Do not remove the terminal cover at
a dangerous position during power conduction. Be sure that the
terminal cover and body cover are installed during the operation. If
you leave the positioner at the operation site for a long time without
using it, put the cover on it so that rain water does not enter the
positioner. If the atmosphere is of high temperature or high humidity,
take measures to avoid condensation inside. The condensation
control measures must be taken thoroughly for export shipment.

PROXIMITY DIV., DWYER INSTRUMENTS, INC.

P.O. BOX 358 • MICHIGAN CITY, INDIANA 46360 U. S . A.

Phone: [phone] www.dwyer-inst.com
Fax: [phone] e-mail: [e-mail]