ARI-STEVI-POS P20

Digital electro-pneumatic positioner

ARI-STEVI-POS P20 Digital electro-pneumatic positioner

The ARI-STEVI-POS® electropneumatic positioner is attached to single-acting pneumatic control valves to convert an electrical 4 to 20 mA setpoint signal into a valve position. The actual position of the control valve is detected via a wear-free, contactless magnetic Hall sensor and compared with the setpoint.
The positioner uses a pneumatic module to regulate the pressure in the pneumatic actuator so
that the actual position lies within a defined deadband range around the setpoint.
The most important settings, such as inversion, deadband and tight-closing function, can be conveniently adjusted via handy switches.
The LCD display allows the user to monitor the status of the position controller.
When the hood is open, it is possible in manual operating mode to move the valve via the position controller using the pushbutton.
In addition to an automatically adjusting deadband, various fixed deadbands of 0.5 %, 1 % and 3 % can also be set..
With the tight-closing function, the pneumatic actuator is completely vented as soon as the setpoint falls below or exceeds the adjusted limits in order to build up the max. force for closing.
The function can be switched on or off as required for each direction via a switch.

Type ARI-STEVI-POS®
Stroke range (linear actuator) 10 up to 120 mm
Rotation angle range (rotary actuator) 25° up to 100°
Pneumatics single-acting
Auxiliary energy Supply air: 1,4 up to 7 bar (20 up to 105 psi)
Air connection G1/4
Manometer connection G1/8
Operation 4…20 mA: max. load voltage: 9,5 V (475 Ω)
Behavior in case of control signal failure Valve is vented
Behavior in case of air pressure failure Valve is vented
Max. cable cross section Operation: 2,5 mm²
Cable diameter for cable glands M20x1,5: clamping range Ø8 – 13 mm
Linearity ±1.5 % F.S. 1)
Hysteresis 1.4 % F.S. 1)
Resolution 0.5 % F.S. 1)
max. permissible ambient temperature -20 °C…+80 °C (-4 °F…+176 °F)
max. storage temperature -25°C…+80 °C (-13 °F…+176 °F)
Body material PA
Hood material PC
Protection class EN 60529 IP66
Corrosion class C3 according to EN ISO 12944-2
Pneumatic operating medium

• Oil content

• Solid impurities

• Pressure dew point

Compressed air according to ISO 8573-1

• Class 4

• Class 4 permanent

• Class 4 (min. 10 K below ambient temperature)

Ventilate actuator

• Supply air pressure 2 bar (29 psi)

• Supply air pressure 4 bar (58 psi)

• Supply air pressure 6 bar (87 psi)

6,36 m³/h (28 USgpm) 11,76 m³/h (51,8 USgpm) 15,72 m³/h (69,2 USgpm)

Vent actuator

• Signal pressure 2 bar (29 psi)

• Signal pressure 4 bar (58 psi)

• Signal pressure 6 bar (87 psi)

7,68 m³/h (33,8 USgpm) 14,76 m³/h (65,0 USgpm) 15,72 m³/h (69,2 USgpm)

Air consumption in controlled condition ≤ 0,024 m³/h (≤ 0,11 USqpm) (at 25 °C)
Mounting position Any, restriction: air connections and silencers not upwards
Weight 0,7 kg
NPT-air connection (optional) 1/4-18 NPT (with NPT-Adapter)
NPT-cable gland (optional) Adapter M20x1,5 x 1/2-14 NPT

Cable gland 1/2-14NPT

Analog output card

4…20 mA passive for current loop 9…32 V

galvanically isolated

max. conductor cross-section for connection terminal: 2,5 mm²

Manometer 2 pieces: 0 – 10 bar / 0 – 140 psi for supply air and working pressure

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