Rotary Digital electro-pneumatic smart positioner STEVI-POS P20 | ARI
Rotary Digital electro-pneumatic smart positioner STEVI-POS P20 | ARI

Rotary Digital electro-pneumatic smart positioner STEVI-POS P20 | ARI

The ARI STEVI-POS P20 is a linear digital electro-pneumatic smart positioner designed for precise control of valve positions in single-acting pneumatic actuators. It automatically adapts to valve travel or rotation angles and features wear-free, contactless position sensing using a magnetic Hall sensor. The positioner operates with low air consumption and allows for simple parameterization via handy switches. It functions with a 4-20 mA signal and offers optional feedback and pressure indication. In case of control signal or air pressure failure, the valve is vented. The device supports a stroke range of 10 mm to 120 mm for linear actuators and a rotation angle of 25° to 100° for rotary actuators. It operates with a pneumatic supply of 1.4 to 7 bar and has a protection class of IP66. The positioner is made from durable materials like polyamide and polycarbonate, and it can be mounted in various positions except with air connections and silencers facing upwards. Optional accessories include NPT air connections, manometers, and an analog output card.

Datasheet and documents

Description

General Features:

  • Automatic valve travel or rotation angle adaption.
  • Wear-free, contactless position sensing via a magnetic Hall sensor.
  • Low air consumption.
  • Simple and clear parameterization using handy switches.
  • Operation: 4 - 20 mA.
  • Optional feedback signal: 4 - 20 mA.
  • Manometer: Optional for pressure indication.
  • Pressure Venting: Valve is vented in case of signal or air pressure failure.


Functional Description:

  • The ARI-STEVI-POS® positioner is designed to convert a 4-20 mA electrical signal into a valve position for single-acting pneumatic actuators.
  • The positioner detects the actual position using a contactless, wear-free Hall sensor and compares it to the setpoint.
  • The pneumatic module adjusts the pressure in the actuator to match the setpoint within a defined deadband range.
  • Deadband: Can be set automatically or manually to values such as 0.5%, 1%, or 3%.
  • Tight-closing function: The actuator is completely vented to maximize force for closing when the setpoint goes below or above adjusted limits. This function can be switched on/off as needed.


Technical Data:

  • Stroke Range (linear actuator): From 10 mm to 120 mm.
  • Rotation Angle (rotary actuator): From **25° to 100°.
  • Pneumatic Supply: 1.4 to 7 bar (20 to 105 psi).
  • Pneumatic Air Connection: G1/4.
  • Air Consumption: ≤ 0.024 m³/h (at 25°C).
  • Maximum Cable Cross Section: 2.5 mm².
  • Cable Diameter for Cable Glands: Ø8 - 13 mm.
  • Linearity: ±1.5% F.S..
  • Hysteresis: 1.4% F.S..
  • Resolution: 0.5% F.S..
  • Protection Class: IP66 (dust and water protection).
  • Ambient Temperature: -20°C to +80°C.
  • Body Material: PA (Polyamide).
  • Hood Material: PC (Polycarbonate).


Behavior in Failure Modes:

  • Control signal failure: Valve is vented.
  • Air pressure failure: Valve is vented.


Accessories:

  • NPT Air Connection (optional): 1/4-18 NPT (with NPT Adapter).
  • Manometer: Two pieces, 0-10 bar (0-140 psi) for supply air and working pressure.
  • Analog Output Card: 4-20 mA passive for current loop (9-32 V).


Mounting:

  • Can be mounted in any position, with the exception of air connections and silencers not being oriented upwards.


Dimensions:

  • Linear Actuators: Dimensions for installation and mounting on linear actuators are provided.
  • Rotary Actuators: Dimensions for rotary actuators are provided as well.

Technical specifications

SIZEDNBOXMASTER BOXCODEØPILØHCHMhh1KvPNKg
1/2"1510406709040001*151580,533275755,5-4,6640,33
3/4"2010406709050001*2016,39539325763-8,8640,48
1"2510206709060001*2519,1110,549385766,5-15640,70

*Version with heptagonal-shaped stainless steel security nut.

Applications

Certifications

Precision and tailoring know-how involve all departments and business sectors, with continuous checks to guarantee the quality of the products, their efficiency and durability. Furthermore, a quality company is also a sustainable company. It is not a choice but a responsibility and Rubinetterie Bresciane has always believed in this. It was the first Lombardy company to receive the A+ energy certification and today it is powered by 7,372 photovoltaic panels with an average annual production of 2,044,000 kWh. The oils used in the processing are reused and the attention to the correct management of waste is constant. Our packaging is evolving over time towards a concept of total sustainability. This idea of “green” is not only shared with all those who work in the company every day, but also is extended to the network of external collaborators, suppliers and customers. With daily work, Rubinetterie Bresciane has also obtained the most important certifications:

ISO 9001 - Quality

The quality is certified by the Swiss body SQS partner of IQNET, that has recognized the Quality Managing System as in conformity with the international code of practice ISO 9001.

ISO 14001 - Environment

Since innovation also means to be ahead of times, Rubinetterie Bresciane, first in Italy in its sector, also applies the Environmental Managing System, certified ISO 14001.

ISO 45001 - Worker's health and safety

ISO 45001 is an Occupation Health and Safety Assessment Series for health and safety management systems. It is intended to help an organizations to control occupational health and safety risks.

ISO 50001 - Energy management system

Continuous improvement applied to the management system and the ongoing search for company inefficiencies, let Rubinetterie Bresciane to implement and integrate an energy management system, certified by SQS in accordance with ISO 50001.