System 6000 Electropneumatic Converter for Direct Current Signals i/p Converter Type 6126

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1 System 6 Electropneumatic Converter for Direct Current Signals i/p Converter Type 66 Application Devices used to convert a direct current signal into a pneumatic signal for measurement and control. Especially suitable as intermediate element between electric measuring devices and pneumatic controllers, or between electric control devices and pneumatic control valves. The converter input accepts a load-independent () to ma direct current signal or a () to V voltage signal. Depending on the supply air pressure, the converter provides a pneumatic output signal of. to bar ( to psi) or. to bar (6 to psi). The i/p converter is available with two different converter modules, Type 69 or 6. Type 6 offers further output signal ranges (see "Technical data"). Special features Small dimensions, low weight and rugged housing Excellent dynamic response Relatively large air output with low air supply consumption Output pressure up to bar Central venting Low vibration effect Versions with reversed characteristic available (only with Type 6 i/p Module) Option of connecting a pressure gauge parallel to the output Operation possible without upstream pressure regulator Zero reset at a specific ma value when a venting function (switch-off) is enabled (function can be activated as required) Zero point and span can be adjusted via potentiometers in devices with electronics Versions For use in non-hazardous areas: Type 66- with electronics, i. e. switch-off electronic function and potentiometer for zero and span Type 66- without electronics Fig. Type 66 i/p Converter with pressure gauge Edition September 6 Data Sheet T 66 EN

2 Principle of operation The electropneumatic converter consists of an i/p module which operates according to the principle of force equilibrium and a downstream volume booster. When operated, the supplied direct current () flows through the plunger coil () located in the field of a permanent magnet (). At the balance beam (), the force of the plunger coil, which is proportional to the current, is balanced against the force of the dynamic back-pressure. The back-pressure is produced on the flapper plate (6) by the air jet leaving the nozzle (7). The air supply (8) flows into the lower chamber of the volume booster. A certain amount of air determined by the position of the diaphragm reaches the sleeve (9) and flows to the output (6). When the input current increases and, as a result, the force of the plunger coil increases as well, the flapper moves closer to the nozzle. This causes the dynamic back-pressure and the cascade pressure p K forming upstream of the restrictor (8.) to increase. The cascade pressure increases until it corresponds to the input current and pushes both the diaphragm () and the sleeve (9) downwards, causing the output pressure p A to increase until a new state of equilibrium is reached in the diaphragm chambers. When the cascade pressure decreases, the diaphragm is pressed upwards and it releases the sleeve. The output pressure p A escapes through the sleeve to the vent (EXHAUST) until the forces on the diaphragm are balanced again. Converters with an input signal range from to ma are equipped with a slide switch which activates the switch-off electronic function. This function causes the pneumatic output to be vented up to approx. mbar when the input signal falls below.8 ma ± tolerance. This ensures tight shut-off of a valve. i ZERO SPAN p K EXHAUST OUTPUT 6 p A GAUGE (6) Balance beam Plunger coil Permanent magnet Input Slide switch 6 Flapper plate Fig. Functional diagram 7 Nozzle 8 Supply air, volume booster 8. Fixed restrictor 9 Sleeve Diaphragm 6 Output 8. SUPPLY 8 9 Installation The converter can be mounted to a wall, pipe or directly to the control valve. The mounting bracket for wall mounting is included in the scope of delivery (see Accessories). Install the converter in horizontal position with the pressure gauge (or screw plug) facing upwards. If a different mounting position is required, zero must be readjusted for devices with electronics, using the ZERO adjuster. T 66 EN

3 Table Technical data Type w/o explosion protection Type 66- Input Output Supply air Performance Air output capacity ) Air consumption ) Hysteresis Deviation from terminalbased conformity () to ma; () to V with V DC auxiliary power; other signals on request Minimum current >.6 ma Load 6 V (corresponds to Ω at ma). to bar ( to psi) (Types 69 and 6 i/p Converter modules). to bar (6 to psi) (Type 6 i/p Converter module) Special ranges up to bar or 7 psi. m /h at.6 bar output (. to. bar). m /h at. bar output (. to. bar) Min.. bar above upper pressure range value, max.. bar without upstream pressure regulator.8 m n /h at. bar. m n /h at. bar Characteristic: Output linear to input. % of final value; more accurate values on request % of final value; more accurate values on request Supply air:. %/. bar ) Effect in % of final value Alternating load, supply air failure, interruption of input current: <. % Ambient temperature: Lower range value <. %/ C, measuring span <. %/ C Dynamic response (measured according to IEC 77) Limiting frequency. Hz Phase shift Effect of variable mounting position Max.. % depending on how the device is mounted; ± % in horizontal position (with Type 69) Max. % depending on how the device is mounted; ±. % in horizontal position (with Type 6) Ambient conditions, degree of protection, weight Ambient temperature to +7 C Degree of protection IP /IP 6 Weight Approx..6 kg Materials Housing Die-cast aluminum, chromated, plastic-coated/glass fiber reinforced polyamide Other parts Corrosion-resistant material ) Measured at average output pressure ) Measured with m hose x T 66 EN

4 Electrical connection Angle connector Back of connector insert (+) Input signal (-) GROUND for input signal and auxiliary energy (V DC) Only with input () V Dimensions in mm Wall mounting 6 Ø7 Vent filter (IP 6) Electrical connection (angle connector DIN EN 7-8 A) Pressure gauge Mounting bracket 7. 6 Attachment to a control valve Pipe mounting Electrical connection 9 Venting 7. 7 Supply 8. Attachment to valve with cast yoke Pipe fixture " Attachment to valve with rod-type yoke T 66 EN

5 Article code Article code Type 66- x x x x x x x x x x x x x Explosion protection Without Pneumatic connection ¼-8NPT ISO-8/ - G ¼ i/p module Type 69 ) Type 6 Input toma to ma, without electronics ) to ma, without electronics ) to V, V DC auxiliary power to V, V DC auxiliary power Output Special ranges ) :. to. bar topsi. to. bar 6topsi Initial value. to. bar; span.7 to. bar Initial value. to. bar; span. to. bar Initial value. to. bar; span. to.8 bar Initial value. to.8 bar; span.8 to. bar Initial value. to.8 bar; span. to.8 bar Initial value. to.8 bar; span.8 to. bar Initial value. to. bar; span. to.9 bar 6 7 Operating direction Increasing/increasing Increasing/decreasing Degree of protection IP IP 6 Output pressure gauge Without With Temperature range T min C Special version None ) Only with output. to bar or to psi ) Without switch-off electronic function and without potentiometer for zero point and span correction ) Specify setting range, e.g. set to. to bar output pressure max. bar, supply air. bar Accessories Mounting material Order no. Wall mounting Included in scope of delivery Pipe mounting ( pipes) -66 Attachment to cast yokes acc. to NAMUR -67 Attachment to valves with rod-type yokes acc. to NAMUR -68 T 66 EN

6 SAMSON AG MESS- UND REGELTECHNIK Weismüllerstraße 6 Frankfurt am Main Germany Phone: Fax: Internet: T 66 EN 7-