Tissin TS800 Digital Valve Positioner PST Function for Pneumatic Actuators

Product Overview

The Tissin TS800 is a smart valve positioner that receives a 4-20mA DC input signal from a control room, DCS, or signal generator and proportionally adjusts the pneumatic pressure to the valve actuator, precisely controlling valve opening. The built-in microprocessor enables auto-setting, PID control, and HART communication.

The unit features an LCD display and four pushbuttons for quick and easy local calibration. It includes a Partial Stroke Test (PST) function, alarm function, built-in auto/manual switch, and self-diagnosis capability. The IP66/NEMA 4X enclosure protects against harsh industrial environments. A large-flow pilot valve improves valve control speed, and the design offers strong vibration and impact resistance.

The TS800 supports both linear (10~150mm) and rotary (0~90°) actuators. Optional features include a 4-20mA DC position transmitter, HART communication module, and limit switch modules. The unit is available with intrinsically safe and CSA explosion-proof certifications.

Technical Specifications

Application Industry

The Tissin TS800 is used in petrochemicals, power generation, water treatment, paper, and general industrial process control. It is suitable for precise throttling control of pneumatic linear and rotary valve actuators in demanding environments.

Common Problems

• Input signal mismatch: Check the power supply voltage. If supply current is normal, reset the <IN ZERO> and <IN END> values in the <TUNING> menu.

• Hunting or oscillation: Increase the dead band value within the field-allowed range. If the dead band is set too low, it slows the search for the target point.

• EEPROM error: Check whether the positioner is installed too high or too low, or too far from the actuator. Check if the potentiometer gear and main gear are out of position due to vibration or external shock.

• No response to input signal: Check supply pressure is within 0.14~0.7 MPa. Verify pneumatic connections are secure. Check the feedback lever installation.

• Slow valve response: If the actuator size is too large, set the TbL value to TbL 4 (LLS).

Replacement Models

The Tissin TS800 is a current-generation smart valve positioner platform. The TS805 is a variant within the same series. For applications requiring explosion-proof certification, the TS800 series offers intrinsically safe and CSA explosion-proof options. For cross-vendor alternatives, verify actuator mounting, travel range, and communication protocol before ordering.