V18345-2021421001 ABB TZIDC Positioner Double Acting New

Product Overview

The ABB V18345-2021421001 is a digitally programmable TZIDC electro-pneumatic positioner engineered for precise control of final control elements. This intelligent instrument integrates advanced diagnostics and HART communication to ensure high-performance valve positioning in hazardous environments. We strongly advise technicians to download the latest V18345 configuration manual to optimize the autostroke functions and PID tuning parameters before final commissioning.

Technical Specifications

• Brand: ABB
• Model: V18345-2021421001
• Series: TZIDC Intelligent Positioner
• Input Signal: 4 to 20 mA (two-wire technology).
• Communication: LKS adapter and FSK module for HART protocol.
• Pneumatic Action: Double-acting, fail-safe (moves to safe position on power loss).
• Supply Pressure: 1.4 to 6 bar (20 to 90 psi).
• Air Consumption: Highly efficient at less than 0.03 kg/h (0.015 scfm).
• Enclosure: Varnished Aluminum, IP 65 / NEMA 4X protection.
• Explosion Protection: ATEX Ex II 2 G EEx ib II C T6 (Intrinsic Safety).
• Connections: 1/2-14 NPT (Cable) and 1/4-18 NPT (Air).

Configuration Breakdown

• V18345 — TZIDC Configurable Positioner with Indicator
  • └── 2 (Case / Mounting)
    • └── Aluminum case with mechanical position indicator for linear/rotary actuators
  • └── 0 (Input / Communication)
    • └── 4-20 mA input with integrated HART support
  • └── 2 (Explosion Protection)
    • └── ATEX Intrinsic Safety certification
  • └── 1 (Output / Safe Position)
    • └── Double acting, Fail-Safe functionality
  • └── 4 (Connections)
    • └── 1/2-14 NPT electrical and 1/4-18 NPT pneumatic ports
  • └── 2 (Option Modules)
    • └── Analog position feedback (4-20 mA signal range)

Oiltech Controls Limited’s Insight

The ABB V18345-2021421001 is a standout in the TZIDC family due to its double-acting fail-safe logic. Unlike single-acting units, this model provides superior control for larger actuators requiring pressure on both sides of the piston. Our engineering team notes that its “low-bleed” pneumatic design significantly reduces compressed air costs—a critical factor for plants with thousands of nodes. The integrated mechanical indicator provides immediate visual confirmation in the field, reducing troubleshooting time during manual overrides.

Diagnostic & Operational Capabilities

• Autostroke: Automatic determination of travel limits and control parameters.
• Configurable Curves: Supports linear, equal percentage (1:25 to 50:1), and user-defined 20-point curves.
• Digital Input Protection: Remote activation for “move to 0%,” “hold last position,” or “disable local access.”
• Equipment Compatibility: Fits DIN/IEC 534 linear actuators and VDI/VDE 3845 rotary actuators.
• Split-Range: Operates with a minimum range of 20% (3.2 mA) for complex valve sequencing.

Logistics & Warranty

• Condition: New & Original in Factory Packing.
• Warranty: Guaranteed 12-Month factory warranty.
• Shipping Carriers: Worldwide express via FedEx, UPS, or DHL.
• Lead Time: Orders are dispatched within 24-48 hours.

Professional FAQ & Selection Guide

What is the primary advantage of the HART communication in the V18345-2021421001?

HART allows for remote configuration and advanced valve diagnostics. Technicians can perform partial stroke tests (PST) and monitor friction levels without physically accessing the valve in hazardous zones.

How does the “Double Acting Fail Safe” function operate during a total power loss?

Upon loss of the 4-20 mA signal, the V18345-2021421001 pneumatically exhausts one side of the actuator while pressurizing the other (depending on setup) to move the valve to its pre-defined safe state.

Can I install this TZIDC model on a rotary actuator without additional brackets?

The unit supports VDI/VDE 3845 mounting, but you must ensure the appropriate mechanical kit for rotary coupling is used to link the positioner shaft to the actuator stem.

What happens if the supply air quality is poor (oil or water presence)?

Poor air quality is the leading cause of I/P module failure. We recommend Instrument Air filtered to 5 microns and a dew point 10°C below ambient to protect the high-precision ABB internals.

Selection Guide: When should I choose the V18345 over the TZIDC-200 series?

Select the V18345 (TZIDC) for standard intrinsic safety (Ex i) applications. If your facility requires flameproof (Ex d) explosion protection, you should transition to the TZIDC-200 or TZIDC-220 series.

Contact Information Inquiries: info@oiltechcontrols.com , +86 158 8020 0923

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