IMI STI SA/CL Analog Positioner for Linear Actuator Dual Acting Petrochemical Thermal Power Plant
The IMI STI SA/CL is a high-performance analog positioner available in both pneumatic and electro-pneumatic versions. Engineered for linear actuators (typically with stroke lengths over 70mm), it provides accurate valve positioning using a classic force-balance principle. Built with a metallic housing and heavy-duty construction, the SA/CL excels in harsh conditions, delivering reliable, stable performance for process control applications. It is suitable for double-acting configurations (and can be adapted for single-acting use), making it a trusted choice in industries requiring durability and precision.
- Heavy-duty metallic case for maximum durability in aggressive environments
- IP65 protection as standard, with options for explosion-proof and intrinsically safe certifications
- Double-acting design (adaptable for single-acting applications)
- High vibration and shock resistance
- Full stainless steel spool valve options (for ND 1/4" and ND 1/2" versions)
- Action inversion without tubing changes (on select models)
- Air purge version available for enhanced protection in dusty/sandy conditions
- Sandstorm execution option for extreme desert or abrasive environments
- Low air consumption and fast response time
- Simple calibration and maintenance
| Specification | Detail |
|---|---|
| Input Signal | 3-15 psi (pneumatic) or 4-20 mA (electro-pneumatic) |
| Supply Pressure | Typically 20-100 psi (depending on configuration) |
| Output | Pneumatic to actuator |
| Stroke Range | Optimized for linear actuators with stroke >70mm (up to specific model limits) |
| Linearity / Hysteresis / Repeatability | High accuracy typical of analog force-balance design (commonly <1% FS) |
| Enclosure | Metallic housing, IP65 standard |
| Operating Temperature | Wide range suitable for industrial use (often -20°C to +80°C or extended with options) |
| Air Connections | 1/4" NPT or G threads (model dependent) |
| Fail-safe Modes | Available configurations for fail-open, fail-close, or stay-in-place |
| Options | ATEX/IECEx explosion-proof, intrinsically safe, stainless steel components, special executions |
(Note: Exact values may vary by specific configuration; consult official IMI STI datasheet for your model variant.)
- Oil & Gas (onshore/offshore platforms, refineries)
- Petrochemical and chemical processing plants
- Power generation (conventional and combined cycle)
- Pulp & paper industry
- Water & wastewater treatment
- General heavy industrial process control where reliable valve actuation is critical in harsh or hazardous areas
Q: Is the SA/CL suitable for rotary actuators?
A: No, it is specifically designed for linear actuators with longer strokes (>70mm). For rotary applications, consider other IMI STI models.
Q: Can it be used in explosive atmospheres?
A: Yes, explosion-proof and intrinsically safe versions are available to meet ATEX/IECEx requirements.
Q: What is the main advantage over digital/smart positioners?
A: The SA/CL offers simple, reliable analog operation with no electronics complexity, making it ideal for applications where robustness and low maintenance are prioritized over advanced diagnostics.
Q: Does it support fail-safe operation?
A: Yes, depending on piping and spring-return actuator setup, it supports fail-open, fail-close, or lock-in-last-position modes.
Q: How do I calibrate the positioner?
A: Calibration is straightforward using zero and span adjustments; detailed instructions are provided in the installation manual.
For inquiries, quotations, technical support, or ordering, please reach out:
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- IMI STI SA-1 Analog Positioner (compact version for shorter strokes)
- IMI STI Smart Series (digital/ HART/FOUNDATION Fieldbus positioners)
- IMI STI Pneumatic Actuators (SC/FC/SCN series linear actuators)
- IMI STI Limit Switch Boxes and Solenoid Valves
- IMI STI Electro-Pneumatic I/P Converters
We are ready to assist with custom configurations and integration solutions for your valve automation needs!
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