ABB V18345-2021421001 TZIDC Electro-Pneumatic Positioner for Precise Valve Control

Technical Specifications Breakdown

The V18345-2021421001 operates with a 4...20 mA two-wire input and supports HART communication via a connector plug for LKS adapter and FSK module. It accepts supply pressure from 1.4 to 6 bar (20 to 90 psi) and consumes less than 0.03 kg/h (0.015 scfm) of air, independent of supply pressure. The digital input recognizes 0...5 V DC as logical "0" and 11...30 V DC as logical "1". Its digital output (control circuit per DIN 19234/NAMUR) supplies 5...11 V DC. The positioner is double-acting and fail-safe, ensuring the valve moves to a safe position on power loss.

Industry Applications

Oil & Gas Upstream: In wellhead control panels, the V18345-2021421001 manages choke valve position with 4...20 mA signals, maintaining setpoint under varying well pressures. Its IP 65 (NEMA 4X) aluminum case withstands outdoor exposure and washdowns.

Chemical Processing: For aggressive media, the varnished black RAL 9005 housing resists corrosion. The analog position feedback module (4...20 mA) provides continuous valve status to the DCS, enabling predictive maintenance and reducing unplanned downtime.

Installation & Setup Guidance

Mount the positioner directly to linear actuators per DIN/IEC 534/NAMUR or to rotary actuators per VDI/VDE 3845. Use the mechanical position indicator for visual confirmation. Connect the 4...20 mA loop to the two-wire input, and terminate the HART communication cable via the LKS adapter. For pneumatic connections, use 1/4-18 NPT threads. The digital input can be configured for protective functions such as move to 0% position or hold last position, activated when the 24 V DC signal drops below 10 V DC.

Maintenance & Reliability

Periodically inspect the air filter and ensure supply pressure remains within 1.4...6 bar. The low air consumption (<0.03 kg/h) reduces compressor load and operating costs. Verify the analog feedback signal (4...20 mA) during routine calibration checks. The electrostatic dipping varnish with epoxy resin protects against environmental degradation, extending service life.

When Process Variability Demands Precision

In chemical plants and refineries, valve positioners face harsh conditions and tight control requirements. The ABB V18345-2021421001 TZIDC Electro-Pneumatic Positioner delivers reliable, repeatable positioning even under vibration, temperature swings, and corrosive atmospheres. Its intelligent configuration and robust aluminum housing make it a top choice for critical loop applications.

Compatibility & Integration

The plug-in analog position feedback module (4...20 mA) allows remote monitoring. The digital input/output conforms to DIN 19234/NAMUR, ensuring compatibility with standard proximity sensors and actuators.

Buying Guide & Purchasing Advice

Before ordering the V18345-2021421001, verify your actuator type (linear or rotary) and mounting standard. Confirm that your control system supports HART if remote configuration is needed. AutoDCSTech stocks this model with fast shipping and expert support to help you select the correct variant for your application.