ABB TZIDC V18345-2021461001 Digital Positioner (Flameproof)

Product Overview

The ABB V18345-2021461001 (V183452021461001) is an advanced, electronically configurable digital positioner from the TZIDC family, specifically designed for high-performance control of pneumatic actuators. This "202" variant is characterized by its Flameproof (Explosion-proof) enclosure, making it the preferred choice for oil refineries, gas processing plants, and offshore platforms where the presence of explosive gases necessitates a robust physical barrier. The V18345-2021461001 utilizes 4-20 mA current-loop technology with integrated HART communication, allowing for precise valve positioning, real-time diagnostics, and remote configuration. Its integrated microprocessor continuously monitors the setpoint versus actual position, employing an optimized control algorithm to minimize air consumption and mechanical wear on the valve assembly.

Technical Configuration

The V18345-2021461001 is engineered for critical control loops and features a modular design for maximum field reliability.

• Explosion Protection: Housed in a rugged, flameproof enclosure (Ex d / XP) designed to contain any internal explosion and prevent the ignition of the surrounding atmosphere.

• Communication Interface: Standard 4-20 mA input with HART protocol, enabling seamless integration with Asset Management Systems (AMS) and remote handheld configurators.

• Pneumatic Action: Configured for single-acting or double-acting pneumatic actuators, providing flexible control for both linear and rotary valve types.

• Digital Diagnostics: Includes advanced monitoring for valve signatures, air supply fluctuations, and friction changes, allowing for predictive maintenance scheduling.

• User Interface: Features an internal LCD and push-buttons behind the flameproof cover for local parameterization and manual control during commissioning.

Technical Specifications

Technical FAQs

Does this version support the "Autoadjust" feature found in the standard TZIDC?

Yes. Despite the flameproof housing, the V18345-2021461001 includes the "Autoadjust" function. It automatically determines the zero point, end position, and optimal PID parameters for the specific actuator attached.

Can I open the enclosure while the unit is powered in a hazardous area?

No. Because this is a Flameproof (Ex d) device, the enclosure must not be opened while the circuit is live unless the area is known to be non-hazardous. For adjustments in hazardous zones, utilize the HART communication protocol remotely.

What is the required air quality for this positioner?

To prevent clogging of the internal I/P converter, instrument air must be free of oil, water, and dust according to ISO 8573-1 (Class 3). A 5-micron local filter-regulator is strongly recommended.

Engineering & Installation Guide

• Conduit Sealing: For Flameproof (Ex d) installations, an approved explosion-proof conduit seal (sealing fitting) must be installed within 18 inches (450 mm) of the device. This prevents explosive gases from traveling through the conduit system.

• Mounting Orientation: While the TZIDC is vibration-resistant, it should be mounted securely using a stainless steel bracket. Ensure the exhaust port points downward or is protected from ingress to prevent rainwater or debris from entering the pneumatic relay.

• Pneumatic Connection: Use stainless steel or high-quality copper tubing for air lines. Ensure all connections are leak-tested with a non-corrosive solution; even small leaks can cause the positioner to cycle unnecessarily, leading to premature wear of the pneumatic diaphragms.