IMI STI DigitalTrak DT DT2 Electro Pneumatic Positioner for Power Plant Petrochemical Metal Production

The IMI STI DigitalTrak DT DT2 Electro Pneumatic Positioner is a high-performance loop-powered intelligent instrument, serving as the core control component of pneumatic valve sets. Based on advanced microprocessor technology, it accepts a 4÷20 mA electrical control signal from the automation system and captures the actual valve position signal via built-in position sensors. The internal software of the instrument compares the two signals in real time to precisely regulate air intake and exhaust of the actuator, driving the valve to reach the set position quickly and accurately. It perfectly replaces conventional valve positioners and supports direct access to the HART communication network, enabling two-way information exchange between the positioner and the control system. With a compact and heavy-duty design, the DT DT2 features high reliability and strong adaptability to industrial environments, and is widely used in various industrial automation control systems.

• High-precision Position Control: Effectively overcomes actuator friction and unbalanced force, with excellent linearity and low hysteresis for accurate valve positioning.
• Intelligent Self-adaptive Functions: Equipped with automatic tuning for calibration and auto-diagnosis system, realizing automatic zero/span search and control parameter optimization.
• HART Communication Compatibility: Directly accesses HART network to realize remote monitoring, parameter configuration and data transmission.
• Integrated Key Modules: Built-in fail-in-place device for signal loss protection and integrated position transmitter for real-time valve position feedback (4~20 mA DC signal).
• User-friendly Operation: With a dedicated calibration display, supports local/remote parameter setting and direct manual operation without opening the cover.
• Robust Industrial Design: Compact structure with modular construction, reduced mechanical parts, strong vibration resistance and integrated lightning protection module to reduce surge damage.
• Low Operating Cost: Loop-powered by 4-20 mA standard two-wire system, with low air consumption and stable performance for low maintenance needs.
• Flexible Installation: Supports remote mounting accessory and is compatible with single/double acting actuators for diverse installation requirements.

As a professional pneumatic valve control core, the IMI STI DigitalTrak DT DT2 is widely applied in industrial automation systems requiring precise flow, pressure, temperature and level control, mainly covering the following industries:

• Petroleum and natural gas (refineries, oil and gas gathering and transportation, petrochemical processing)
• Chemical industry (basic chemical manufacturing, fine chemical production, chemical material processing)
• Electric power generation (thermal power plants, hydropower stations, gas power plants, auxiliary system control)
• Metallurgy and mining (steel smelting, non-ferrous metal processing, mineral processing)
• Pulp and paper industry (papermaking process control, pulp preparation and processing)
• Light industry (food and beverage, pharmaceutical manufacturing, textile and printing)
• Water treatment and environmental protection (sewage treatment, water supply system, waste gas treatment)
• General industrial process control (DCS/PLC-based automatic control systems, remote monitoring process plants)

A1: First check if the supply air pressure is above 1.4 bar and adjust it to the standard range if insufficient. If the pressure is normal, inspect the actuator for jamming issues, check the air loop for leaks and re-initialize the positioner if the initialization process was exited prematurely.

A2: "Down" means the zero point of the position sensor is too low, and "up" indicates the span point is too high. Both are caused by incorrect installation of feedback components. Please recheck the installation in accordance with the manual and fine-tune the position of the installation bracket, then re-initialize if necessary.

A3: Enter: In normal mode, press the A/M and △ buttons simultaneously for 3 seconds (the upper line displays parameter values, the lower line displays parameter names). Exit: In diagnosis mode, press the A/M button alone for 3 seconds to return to normal mode.

A4: The main reasons include reverse polarity of external electrical connections, failure of the position feedback module, or zero/span drift. Please first check and correct the wiring, then trim the zero/span of the module; replace the feedback module if the problem persists.

A5: 1) Keep the air supply dry and clean, and regularly drain water and impurities from the air regulator; 2) Check the feedback connection for looseness and tighten it in time; 3) Keep the pressure gauge clear for real-time monitoring of air pressure status; 4) Re-initialize the positioner if zero/span error occurs after maintenance.

A6: First check if the input signal is normal (≥3.6 mA), then inspect the electrical connection terminal screws and tighten loose ones; if the display is still not working, the main board may be faulty and needs to be replaced.

For product consultation, technical support, quotation and order placement, please contact us via the following channels:

wechat/what's app/phone number:+86 13472860702

1. IMI STI Pneumatic Actuators (single/double acting, for matching with DT DT2 positioner)
2. IMI STI Valve Accessory Kits (air filter regulators, solenoid valves, limit switches)
3. IMI STI HART Communication Gateways (for remote network integration and data management)
4. IMI STI Explosion-proof Valve Positioners (for hazardous area applications in oil and gas/chemical industries)
5. IMI STI Digital Valve Controllers (integrated control and positioning for high-precision process systems)