ASCO Solenoid Valves and Samson 3730-3 Electropneumatic HART Valve Positioner Valve Controller
Engineered by SAMSON, the Type 3730-3 electropneumatic positioner integrates a travel sensor, i/p converter, air booster, and microcontroller for high-precision valve control. It compares valve travel/angle to a 4-20 mA signal, outputting pneumatic pressure to actuators. Supports HART for communication and diagnostics, with firmware updates enhancing functionality like automatic option detection and extended configuration periods.
- Control Mechanism: PD controller with A/D conversion for real-time deviation correction.
- Pneumatic Optimization: Volume restriction Q for actuator size adaptation; intermediate flow regulator for stable booster operation.
- Diagnostics Integration: EXPERT+ for predictive maintenance via TROVIS-VIEW or DTM.
- Safety Features: Fail-safe venting via optional solenoid; signal pressure limiting.
- Communication: Serial SSP interface and HART (Rev 5/6) for parameter tuning.
- Customizability: User-defined characteristics (e.g., butterfly/rotary plug valves).
- Hazardous Area Ready: IP 65 rating, multiple explosion protections.
| Parameter | Details |
|---|---|
| Load Impedance | ≤8.2 V (410 Ω at 20 mA) |
| Air Delivery (Pressurized/Vented) | Δp=6 bar: 8.5/14.0 m³/h; Δp=1.4 bar: 3.0/4.5 m³/h |
| Influences | Temperature: ≤0.15%/10K; Vibration: ≤0.25% up to 2000 Hz/4g |
| Explosion Protection | EEx ia IIC T6, EEx nA II T6, IECEx, FM/CSA IS/NI |
| Communication | HART impedance: Receive 350-450 Ω, Send ~155 Ω |
| Binary Contacts | No Ex: R=348 Ω (conductive); Ex: ≥2.1 mA / ≤1.2 mA |
| Software Requirements | TROVIS-VIEW module 3730-3; HART DTM for FDT frames |
Optimized for industrial control in environments with variable transit times or harsh conditions, including throttling in pipelines and use with external sensors for remote setups. Applicable to IEC 60534-6 linear actuators or VDI/VDE 3845 rotary ones, often in petrochemical or power generation for flow regulation.
- What causes 'No emergency mode' (Code 76)? Indicates lack of fallback during faults; check firmware and settings.
- How to perform zero calibration? Access via Code 6 after initialization; tracks calibrations since last init.
- Can transit times be limited? Yes, via Codes 21/22 up to 240 s to prevent rapid actuator engagement.
- What if initialization fails? Reset to defaults (Code 36) or check lever/pin position.
- How to integrate with PLC? Binary inputs per EN 61131-2, P_max=400 mW.
Phone/WeChat/WhatsApp: +8613916209596
Email: svetama@gbsxj.com
- Type 3730-31000000400000009.03: Specific variant with HART.
- TROVIS 3730-3: Upgraded smart positioner.
- Type 3730-4: With PROFIBUS-PA.
- Type 3731-3: For explosive atmospheres.
- Accessories: Type 3710 Reversing Amplifier.
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