AP Pneumatic Positioner

The AP pneumatic positioner combines the smoothness and accuracy of Kinetrols’proven mechanical postioner technology (using a proportional spool valve driven bya simple, accurate and robust force balance mechanism) with new advances inconvenience and simplicity of use, derived from the unique innovative design bothof the internal mechanism and of the overall package.The result is a positioner with unparalleled performance and real industrialrobustness, sweet and easy to calibrate and characterize, and adaptable to thewhole range of applications with its unbeatable list of options – highflow valves, direct mount or industry standard discrete mounthousings, 4-20mA angle retransmit, limit switches, Clear Coneposition monitor and I/P convertors (either simple or withvarious explosion proof options).

AP Pneumatic Positioner

INTERCHANGEABLE PORTPLATES – easily convertible fordifferent flowrate options.

GAUGE PORT –as standard.

EXHAUST SNUBBER SCREWS – allow travel speed reduction downto 1/ 3 x full speed, independently in each direction, by screwing into restrict exhaust air flow.

INTERNAL ANGLE SCALE – with adjustable indicator foreasy field calibration.

SPAN ADJUSTMENT –quick and easythumbwheel setting withslotted locking screw.

FEEDBACK POT DRIVE – zero backlash,proven trouble free for life.

OPTIONAL ANGLE RETRANSMIT CIRCUIT –externally powered (8–30v DC) linear 4-20mAfeedback, rangable down to 30º for full 4-20mA span. Easily accessible zero and spanadjustment.

RETRANSMIT POT – high quality conductive plastic servo–type with ballbearings. Proven long life and high precision.

ACTUATOR INTERFACE– options include NAMURstandard (shown), Kinetrolmale square or Kinetroldirect mount femalesquare. Quick externalconversion allows bracketmounting to any rotary orlinear actuator.

CARRIER PLATE ASSEMBLIES – integratedassemblies carrying the feedback shaft and camplus angle retransmit drive and pot (when specified).Easily removed for conversion or maintenance.

AIRFLOW CHANGEOVER BLOCK – allows selection of direction in which positionermoves (for direct mount models).

LID – shown with optional Clear Cone sealed anglemonitor. Epoxy coated die–cast metal held on by fourcaptive screws gives quick access to the interior.

SPOOL VALVE– highly reliable,all metal, 5 portproportionalvalve controlsthe air flow.Three versions,with differentflowrates, areeasilyinterchangable.

3–TERMINAL DIN PLUG – retrofitable option availablefor 4-20mA angle retransmit. Allows fully externalconnection with rapid connect/disconnect capability.

UNIT IDENTIFICATION – eachpositioner carries a unique serialnumber and is CE marked.

ZERO ADJUSTMENT – quick and easy thumbwheelsetting with slotted locking screw.

STRAIGHT–LINE MECHANISM –unique geometry allows cw/ccwchange over by simple cam inversion.

FEEDBACK SHAFT –innovative colletconnection permits quick–fit/release of the actuatorinterface and eliminatesbacklash.

FEEDBACK CAM –quick and easyreversal ( for rotationalsense handing) orreplacement (tochange the responsecharacteristic) of thecam is facilitated by aspring loadedretention device.

SEALING CAP

ENCLOSURE – robust die-cast metal withtough corrosion-resistant epoxy coating andO-ring sealing. Layout gives easy access toall adjustments on removal of lid.

OPERATING PRINCIPLES• The AP positioner is designed to drive a

rotary or linear actuator to a position set bya 3-15 psi (0.2 - 1.0 bar) signal and hold itthere until the signal changes.

• When a signal pressure is applied to thediaphragm it moves the force balance leverclockwise against the tension of thefeedback spring. This moves the spoolvalve, supplying air pressure to one side ofthe actuator while exhausting trapped airfrom the other side. The feedback shaftfollows the movement of the actuator andturns the cam counter clockwise, pushingthe cam follower and increasing the tensionon the feedback spring until it balances theforce on the diaphragm and moves thespool valve to its central ‘hold’ position.

• The relationship between the input signaland desired position (the ‘characteristic’) isdetermined by the cam profile. A linear 3-15psi (0.2 - 1.0 bar) signal / 0-90° outputmovement cam is standard. Split range, fastopening, equal percentage or customizedcharacteristic cams are available.

ORDERING CODES

SCHEMATIC FUNCTIONALDIAGRAM

Key Features

• FAST, SMOOTH AND ACCURATERESPONSE From stepless cam drive and proportionalspool valve.

• UNIVERSAL APPLICATIONMount on any quarter - turn or linearactuator, simple or double acting, in anyorientation. Adjustable span may be setanywhere within the 100° range.

• HIGH FLOW / GAIN VERSIONS93 nl/min (3.3 scfm), 283 nl/min (10 scfm)and 764 nl/min(27 scfm) models areavailable.

• INTEGRAL OPTIONS – EASILYRETROFITTED MODULES– two wire 4–20mA angle retransmit insideenclosure– mechanical or inductive position indicationswitches (for general and hazardous areas)in IP65 box– general and hazardous area 4–20mA I/Pconverter modules (intrinsically safe andNEMA 7 explosion proof options available)– high visibility Clear Cone angle monitor onpositioner and switch box versions– DIN plug for external retransmitconnection.– Viton seals for 100°C ambientapplications.

• SIMPLE, TIME SAVING FIELD SETUPEasy calibration and quick reversal ofrotational sense without special tools oradditional parts. Fast change of responsecharacteristic cams.

• COMPACT AND ROBUST METALHOUSINGWeatherproof sealed and epoxy painted forharsh industrial environments.

• PROVEN FORCE BALANCE SYSTEMEmploying unique straight - line mechanism–minimising wear, backlash and friction. Positioning is unaffected by supply pressure flutuations.

• VISUAL POSITION INDICATIONExternal pointer / scale or high visibilityClear Cone angle monitor plus internalangle scale for field setup.

• INSTALLATION FLEXIBILITYMount on any actuator using VDI / VDE3845 NAMUR drive, or Kinetrol malesquare,with mounting brackets, or directmount ( with intergral porting) to Kinetrolactuators.

• VIBRATION AND SHOCK RESISTANTLow mass spool and robust mechanismprovide 4G / 1OOHz industrial vibrationtolerence in any attitude.

• ADAPTATIONS AND ACCESSORIESConsult Kinetrol for:– split range or customized cams– special failure modes eg fail-freeze– filters, regulators and gauges– mounting kits for rotary / linear drives.

Air Supply instrument quality (dry, clean, oil free)3.5 to 7.0 bar, 50psi to 100psi standardconsult Kinetrol for low pressure application

Signal 3 – 15psi (0.2 – 1.0 bar) standard consult Kinetrol for split range, 6-30psi etc

Control Response 0 – 90° linear output standard consult Kinetrol for other characteristic cam options

Sensitivity better than 0.7% of span

Hysteresis better than 0.7% of span

Deviation from less than 1.0% of spanlinearity

Flowrates AP: 3.3 scfm ( 93 nl/min) @5.5 barMP: 10.0 scfm (283 nl/min) @5.5 barHP: 27.0 scfm (764 nl/min) @5.5 bar

Operating temperature -20° to 80°C standardrange -20° to 100°C Viton

Weight 2.8 kg / 6.2 lb

AP Pneumatic PositionerDIMENSIONS

SPECIFICATION

AP Positioner shown direct mounted on a Kinetrol 07 Actuator

NAMUR Discrete Version

Kinetrol Discrete High Flow Version

Kinetrol Non-Hazardous I/P

Materials case and cover - zinc alloy spool and liner -stainless steel diaphragm - polyester reinforced

polyurethane or Vitonfeedback spring - steel

Finish epoxy stove enamel

Enclosure rating IP54

Output torque same as double acting or spring return actuator when controlling fast movement of intertia loads consult Kinetrol

Vibration tolerance 4G, 100Hz

I/P converter options Non - hazardous

CENELEC EEx d IIC T6

FM Class I Division 1 explosion proof Groups B,C,Dintrinsically safe Groups A,B,C,D,E.F,G

CSA Class I Division 1 explosion proof Groups B,C,Gintrinsically safe Groups A,B,C,D

The policy of KINETROL is one of continuous improvement. We reserve the right to alter the product as described and illustrated without notice.

Kinetrol Ltd, Trading Estate, Farnham, Surrey GU9 9NU, EnglandTelephone: 01252 733838 Fax: 01252 713042

e-mail: sales@kinetrol.comKF 391 8/99

Note: When drawing information is not given - it is the same as basic version.

Explosion Proof I/P Version Switch Box Version