ABB V18345-2021421001 TZIDC Electro-Pneumatic Positioner Overview

Product Introduction

When precise valve positioning is critical in industrial processes, the ABB V18345-2021421001 TZIDC electro-pneumatic positioner delivers reliable performance. This intelligent positioner features an integrated indicator and operator panel, making configuration and monitoring straightforward. The V18345-2021421001 is part of the TZIDC series, designed for demanding automation environments where accuracy and durability are essential.

Technical Specifications Breakdown

The ABB V18345-2021421001 operates with a 4...20 mA input signal using two-wire technology, supporting both direct and reverse action. It accepts a supply pressure range of 1.4...6 bar (20...90 psi) and maintains low air consumption below 0.03 kg/h (0.015 scfm), independent of supply pressure. The digital input recognizes logical switching states: 0...5 V DC for state "0" and 11...30 V DC for state "1". The digital output provides a control voltage of 5...11 V DC per DIN 19234/NAMUR. Housed in an aluminum enclosure with IP 65 / NEMA 4X protection, the unit weighs 1.7 kg. It includes a plug-in module for analog position feedback (4...20 mA) and supports HART communication via an LKS adapter and FSK module.

Industry Applications

This positioner excels in applications requiring reliable valve actuation in harsh environments. Its double-acting fail-safe design ensures the valve moves to a safe position during power loss, critical in oil and gas, chemical, and power generation facilities. The IP65 aluminum housing withstands dust and water jets, making it suitable for outdoor or washdown areas. The configurable characteristic curve—linear, equal percentage (1:25, 1:50, 25:1, 50:1), or user-defined with 20 reference points—allows optimization for specific process control needs.

Installation & Setup Guidance

Mount the V18345-2021421001 to linear actuators per DIN/IEC 534/NAMUR or to rotary actuators per VDI/VDE 3845. Use the 1/2-14 NPT cable thread and 1/4-18 NPT air pipe thread for connections. Configure the positioner via the local operator panel or remotely using the configuration program. Set the signal range between 4 mA and 20 mA, with a recommended range above 50% (8.0 mA) for optimal performance. Select the desired protective function for the digital input, such as moving to 0% or 100% position, holding last position, or disabling local access.

Maintenance & Reliability

Routine inspection of the aluminum housing and pneumatic connections helps maintain IP65 integrity. The low air consumption reduces operational costs and extends component life. Periodically verify the analog feedback signal and digital input/output functionality. For safety-critical applications, follow the manufacturer's guidelines for periodic testing. The robust electrostatic dipping varnish with epoxy resin protects against corrosion, ensuring long service life in demanding environments.

Selection Guide & Purchasing Advice

Before ordering, confirm that the V18345-2021421001 matches your actuator type and required fail-safe action. Verify the explosion protection rating (ATEX Ex II 2 G EEx ib II C T6) meets your area classification. Ensure compatibility with your control system's 4...20 mA loop and HART communication requirements. BluePLC Industrial offers this positioner with expert support to help you select the correct configuration. Contact us for current availability and lifecycle status.