V18345-2107121001 ABB TZIDC Intelligent Electro-Pneumatic Positioner

V18345-2107121001 TZIDC Intelligent Valve Positioner Architecture

The V18345-2107121001 is an advanced microprocessor-controlled electro-pneumatic valve positioner engineered within the ABB TZIDC Series. Designed for precise modulation of linear and rotary actuators, this unit accepts a standard two-wire 4 to 20 mA command signal equipped with HART protocol communication. Encased in a rugged, stove-hardened epoxy-varnished aluminum housing (IP65 / NEMA 4X), it features an integrated local operator panel, ATEX intrinsic safety certification, and built-in mechanical proximity switches for absolute valve stroke verification.

Part Number Nomenclature & Configuration Breakdown

• V18345-2107121001 Suffix Tree:
  • Base Series (V18345): TZIDC intelligent electro-pneumatic positioner with local display and user interface.
  • Case & Indicator (2): Varnished aluminum enclosure, IP65 / NEMA 4X rating, with mechanical position indicator for NAMUR linear or VDI/VDE 3845 rotary actuators.
  • Control Design (0): Standard intelligent configurable positioner with indicator and operator keypad.
  • Communication (1): 4 to 20 mA two-wire input loop with dedicated LKS local communication adapter port.
  • Explosion Protection (7): ATEX Ex II 2 G EEx ia II C T6 intrinsic safety rating for hazardous zones.
  • Safe Failure Action (1): Single-acting pneumatic output with fail-safe / fail-freeze venting on electrical power failure.
  • Port Threads (2): 1/2-14 NPT electrical conduit connection and 1/4-18 NPT pneumatic air supply threads.
  • Feedback Module (1 & 0 & 0): Base unit configured without plug-in analog feedback cards.
  • Mechanical Limit Kit (1): Equipped with SJ2-SN proximity switches for discrete digital position feedback (NC / logical 1).

Comprehensive Technical & Metrology Specifications

Warranty Protection & Global Express Logistics

• 12-Month Hardware Warranty: Every V18345-2107121001 positioner is backed by a comprehensive 12-month warranty covering electronic control boards, pneumatic pilot assemblies, and sensor calibration.
• Expedited Worldwide Dispatch: Fast, secure international shipping via premier logistics carriers including FedEx, UPS, and DHL, protected in shock-absorbing industrial packaging.

Engineering FAQ & Application Selection Guide

Q1: How do the built-in SJ2-SN proximity switches (V18345-2107121001 suffix 1) report end-of-travel status to the DCS?

A1: The integrated SJ2-SN inductive proximity sensors operate in conjunction with an internal target flag, altering their switching state according to DIN 19234 (NAMUR) standards when the valve reaches fully open or closed positions.

Q2: What instrument air purity grade is mandatory to prevent internal pilot nozzle clogging?

A2: Instrument air must comply with ISO 8573-1 Class 3 purity standards, restricting maximum particle size to 5 μm, oil content to 1 mg/m³, and maintaining a pressure dew point at least 10 K below operating temperature.

Q3: Can control engineers adjust the dead band parameter on this unit to eliminate hunting on vibrating compressors?

A3: Yes, operators can increase the dead band setting from 0.1% up to 10% via the local keypad or HART communication to absorb mechanical valve stem dithering caused by high-frequency plant vibrations.

Q4: Why does the unit vent actuator air pressure automatically during a sudden plant electrical failure?

A4: The single-acting fail-safe pneumatic relay exhausts output pressure Y1 upon loss of electrical loop power, allowing the actuator spring to drive the valve safely to its designated mechanical rest position.

Q5: How does selecting split range operation (e.g., 20% to 100% of 4–20 mA) benefit multi-valve cascade loops?

A5: Split ranging allows a single controller output to sequence two distinct control valves sequentially, improving fine throttling control across wide fluid flow variations.

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