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
| SIZE | DN | BOX | MASTER BOX | CODE | ØP | I | L | ØH | CH | M | h | h1 | Kv | PN | Kg |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2" | 15 | 10 | 40 | 6709040001* | 15 | 15 | 80,5 | 33 | 27 | 57 | 55,5 | - | 4,6 | 64 | 0,33 |
| 3/4" | 20 | 10 | 40 | 6709050001* | 20 | 16,3 | 95 | 39 | 32 | 57 | 63 | - | 8,8 | 64 | 0,48 |
| 1" | 25 | 10 | 20 | 6709060001* | 25 | 19,1 | 110,5 | 49 | 38 | 57 | 66,5 | - | 15 | 64 | 0,70 |
*Version with heptagonal-shaped stainless steel security nut.
Applications
