ABB TZIDC V18345 | Intelligent HART Valve Positioner 4–20mA, NAMUR Mount, 1/2" NPT — Single / Double Acting
ABB TZIDC (V18345 series) intelligent electro-pneumatic valve positioner with HART protocol, 4–20 mA input, single/double-acting, NAMUR mount, IP66, auto-calibration. Compatible with linear & rotary pneumatic actuators.
Product Overview
The ABB TZIDC (Type V18345 series) is a microprocessor-based intelligent electro-pneumatic positioner for mounting on pneumatic linear or rotary actuators. It accepts a standard 4–20 mA DC (two-wire) setpoint signal with HART 5/7 communication superimposed, and converts it to a pneumatic output (single-acting: 1 output; double-acting: 2 outputs) to drive the valve to the commanded position. The positioner features fully automatic calibration (auto-zero, auto-travel, auto-PID tuning) via three pushbuttons and a local LCD, NAMUR / VDI-VDE 3845 mounting, and IP65/IP66 aluminum housing. Electrical connection is 1/2"-14 NPT with 1/4"-18 NPT pneumatic ports. Typical reference models include V18345-1010121001 (single-acting, fail-safe, 4–20 mA feedback) and V18345-1010421001 (double-acting, fail-safe, 4–20 mA feedback). Suitable for chemical, oil & gas, power, water treatment, and pharma process control loops.
Technical Specifications (Electrical & Signal)
| Parameter | Specification |
| Series / Type | ABB TZIDC — V18345 Series Intelligent Positioner |
| Input Signal | 4–20 mA DC, two-wire (loop-powered), load ≤ 485 Ω |
| Communication Protocol | HART 5 / HART 7 (FSK modulated on 4–20 mA loop) |
| Position Feedback (Optional) | 4–20 mA DC analog (two-wire), or digital switch contact |
| Supply / Loop Power | Powered from 4–20 mA signal loop (nom. 7.5–30 V DC across terminals) |
| Digital Inputs | 1 × for remote open/close or disable (0–5 V / 11–30 V logic) |
| Digital Outputs | 1 × NAMUR-type limit switch output (optional) |
| Accuracy / Linearity | ±0.5 % FS (typical), hysteresis ≤ 0.1 % FS |
| Dead Band (Adjustable) | 0.1 – 10 % of span |
Technical Specifications (Pneumatic & Mechanical)
| Parameter | Specification |
| Actuator Type | Single-Acting (1 output + spring return) or Double-Acting (2 outputs) — per model selected |
| Supply Air Pressure | 1.4 – 6.0 bar (20 – 90 psi) — filtered, oil-free (ISO 8573-1 Class 3) |
| Output Pressure | 0 – Supply Pressure (linear) |
| Air Consumption (Steady State) | ≤ 0.03 kg/h (≈ 0.015 scfm) @ 1.4 bar supply |
| Travel Range | Linear: 10–100 mm (std), extendable; Rotary: up to 90° (std), up to 270° with extended sensor |
| Mounting Standard | NAMUR (VDI/VDE 3845) for rotary actuators; direct link for linear actuators (DIN/IEC 534) |
| Electrical Connection | 1/2"-14 NPT (threaded) — cable gland typically supplied |
| Pneumatic Connection | 1/4"-18 NPT (supply & output) — also available with G 1/4" |
| Housing / Protection | Die-cast Aluminum, epoxy painted — IP65 / IP66 (NEMA 4X) |
| Ambient Temperature | -40 … +85 °C (some variants -25 … +70 °C) |
| Vibration Resistance | 10 g (10–150 Hz) per IEC 60068-2-6 |
| Weight (Approx.) | 1.7 kg |
| Safety / SIL | SIL 2 capable (per IEC 61508, with appropriate configuration) |
| Hazardous Area Approval | Non-Ex (std.), or Ex ia / Ex d / Ex nA — per suffix |
Key Features
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One-Button Auto-Calibration: Full auto-tuning of zero, span, direction, and PID in < 3 min — drastically reduces commissioning time.
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HART Communication: Remote configuration, diagnostics, and valve signature testing via handheld or DCS — no separate comms card needed.
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Universal Actuator Fit: NAMUR rotary mount + linear link kit — works with virtually all major pneumatic actuator brands.
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Adaptive Control Algorithm: Microprocessor continuously optimizes gain to suit valve/actuator dynamics — stable on both fast small valves and large sluggish ones.
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Low Air Consumption & Self-Diagnostics: < 0.03 kg/h steady-state air use; built-in checks for valve sticking, packing friction, air supply loss, and sensor drift.
Typical Applications
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Process Control Valves: Flow, pressure, level, and temperature control loops in refineries, petrochemical, and fine chemical plants.
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Power Generation: Boiler feedwater, steam extraction, and desuperheating station control valves.
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Water & Wastewater: Chlorine dosing, pH control, and sludge line modulating valves.
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Pharmaceutical & Food: CIP/SIP skid valve control where traceability and HART diagnostics are required.
Typical representative model codes: V18345-1010121001 = Single-acting, fail-safe (go to spring position on signal loss), non-Ex, 4–20 mA feedback, 1/2" NPT / 1/4" NPT — V18345-1010421001 = Double-acting same options. For double-acting with fail-freeze (3-way protection module) or Ex d/ia variants, adjust the 4th & 5th digit groups accordingly (e.g. V18345-2010421001 for double-acting Ex d with mechanical indicator).
