When Process Variability Demands Precision
In chemical plants and refineries, valve positioners face harsh conditions and tight control requirements. The ABB V18345-2021421001 TZIDC Electro-Pneumatic Positioner delivers reliable, repeatable positioning even under vibration, temperature swings, and corrosive atmospheres. Its intelligent configuration and robust aluminum housing make it a top choice for critical loop applications.
Technical Specifications Breakdown
The V18345-2021421001 operates with a 4...20 mA two-wire input and supports HART communication via a connector plug for LKS adapter and FSK module. It accepts supply pressure from 1.4 to 6 bar (20 to 90 psi) and consumes less than 0.03 kg/h (0.015 scfm) of air, independent of supply pressure. The digital input recognizes 0...5 V DC as logical "0" and 11...30 V DC as logical "1". Its digital output (control circuit per DIN 19234/NAMUR) supplies 5...11 V DC. The positioner is double-acting and fail-safe, ensuring the valve moves to a safe position on power loss.
Industry Applications
Oil & Gas Upstream: In wellhead control panels, the V18345-2021421001 manages choke valve position with 4...20 mA signals, maintaining setpoint under varying well pressures. Its IP 65 (NEMA 4X) aluminum case withstands outdoor exposure and washdowns.
Chemical Processing: For aggressive media, the varnished black RAL 9005 housing resists corrosion. The analog position feedback module (4...20 mA) provides continuous valve status to the DCS, enabling predictive maintenance and reducing unplanned downtime.
Installation & Setup Guidance
Mount the positioner directly to linear actuators per DIN/IEC 534/NAMUR or to rotary actuators per VDI/VDE 3845. Use the mechanical position indicator for visual confirmation. Connect the 4...20 mA loop to the two-wire input, and terminate the HART communication cable via the LKS adapter. For pneumatic connections, use 1/4-18 NPT threads. The digital input can be configured for protective functions such as move to 0% position or hold last position, activated when the 24 V DC signal drops below 10 V DC.
Maintenance & Reliability
Periodically inspect the air filter and ensure supply pressure remains within 1.4...6 bar. The low air consumption (<0.03 kg/h) reduces compressor load and operating costs. Verify the analog feedback signal (4...20 mA) during routine calibration checks. The electrostatic dipping varnish with epoxy resin protects against environmental degradation, extending service life.
Compatibility & Integration
This positioner integrates seamlessly with ABB and third-party DCS/PLC systems via 4...20 mA analog control and HART digital communication. The plug-in analog position feedback module (4...20 mA) allows remote monitoring. The digital input/output conforms to DIN 19234/NAMUR, ensuring compatibility with standard proximity sensors and actuators.
Buying Guide & Purchasing Advice
Before ordering the V18345-2021421001, verify your actuator type (linear or rotary) and mounting standard. Confirm that your control system supports HART if remote configuration is needed. SpareTechPLC stocks this model with fast shipping and expert support to help you select the correct variant for your application.
Frequently Asked Questions
Q: What is the input signal range for the V18345-2021421001?
A: The nominal input range is 4...20 mA, with a minimum signal of 4 mA and maximum of 20 mA. Split-range operation is configurable with a minimum range of 20% (3.2 mA).
Q: Can I use this positioner in hazardous areas?
A: Yes, the V18345-2021421001 carries ATEX Ex II 2 G EEx ib II C T6 approval for use in Zone 1 gas groups.
Q: What protective functions can the digital input perform?
A: You can select no function, move to 0% position, move to 100% position, hold last position, disable local configuration, disable local configuration and operation, or disable any access. The function activates when the 24 V DC signal drops below 10 V DC.
Q: Does the positioner include a position feedback module?
A: Yes, it comes with a plug-in analog position feedback module providing a 4...20 mA output signal.
Q: What is the weight of the V18345-2021421001?
A: The unit weighs 1.7 kg.
