Introduction
When a process plant requires precise valve positioning in hazardous environments, the ABB V18345-1011121001 TZIDC electro-pneumatic positioner delivers reliable performance. This intelligent positioner combines a robust aluminum IP65 case with ATEX explosion protection, making it suitable for challenging industrial settings.
Technical Specifications Breakdown
The V18345-1011121001 operates on a 4-20mA input signal and features an LKS adapter for communication. Its explosion protection rating is ATEX Ex II 2 G EEx ib II C T6, ensuring safe operation in explosive gas atmospheres. The positioner is single-acting with fail-safe action, and it accepts electrical connections via 1/2-14 NPT and air connections via 1/4-18 NPT. An optional plug-in module provides analog position feedback with a 4-20mA two-wire signal. The unit weighs 1.7 kg (3.75 lb) and requires instrument air free of oil, water, and dust per DIN/ISO 8573-1, with supply pressure between 1.4 and 6 bar (20-90 psi). Air consumption is less than 0.03 kg/h (0.015 scfm), independent of supply pressure.
Industry Applications
In oil and gas refineries, the ABB V18345-1011121001 controls valve positions in areas where flammable gases may be present. Its ATEX Ex ib IIC T6 certification allows installation in Zone 1 hazardous locations. The positioner's characteristic curve options—linear, equal percentage 1:25 or 1:50, and freely configurable with 20 reference points—enable precise matching to valve characteristics. With a characteristic deviation of ≤0.5% and an adjustable dead band of 0.1-10%, it maintains tight process control even under vibration up to 10 g at 80 Hz.
Installation & Setup Guidance
Mount the V18345-1011121001 securely to the actuator using standard brackets. Connect instrument air to the 1/4-18 NPT port, ensuring the supply is clean and dry per DIN/ISO 8573-1 class 3. Wire the 4-20mA signal to the 1/2-14 NPT electrical connection. Configure the action (direct or reverse) and characteristic curve via the operator panel. The sample rate of 20 msec and resolution over 4000 steps allow fine adjustment. Verify that supply pressure does not exceed the actuator's maximum operating pressure.
Maintenance & Reliability
Routine inspection of the air supply quality and electrical connections helps maintain reliable operation. The aluminum IP65 case protects against dust and water ingress (NEMA 4X equivalent). The positioner's tolerance band (0.3-10% adjustable) and dead band (0.1-10% adjustable) can be tuned to compensate for wear over time. Ambient temperature changes affect performance by ≤0.5% per 10°C, so ensure the environment remains within acceptable limits. Seismic requirements per DIN/IEC 68-3-3 Class III ensure the unit withstands strong earthquakes.
Frequently Asked Questions
Q1: What is the supply pressure range for the ABB V18345-1011121001?
A1: The supply pressure range is 1.4 to 6 bar (20-90 psi).
Q2: Does the V18345-1011121001 support analog feedback?
A2: Yes, a plug-in module provides analog position feedback with a 4-20mA two-wire signal.
Q3: What explosion protection does this positioner have?
A3: It has ATEX Ex II 2 G EEx ib II C T6 certification.
Q4: What is the air consumption of this model?
A4: Air consumption is less than 0.03 kg/h (0.015 scfm), independent of supply pressure.
Q5: Can the characteristic curve be customized?
A5: Yes, it can be linear, equal percentage 1:25 or 1:50, or freely configured with 20 reference points.
