ABB V18345-1027121001 TZIDC positioner specifications. ATEX certified, IP65, 4-20mA HART, double-acting fail-freeze, with analog feedback. For hazardous area valve control.

ABB V18345-1027121001 Electro-Pneumatic Positioner

The ABB V18345-1027121001 is a TZIDC series electro-pneumatic positioner with ATEX explosion protection certification​ and double-acting fail-freeze (hold last position)​ functionality. This model is designed for hazardous areas (Zone 1/2) and includes a plug-in analog position feedback module as standard. It converts a 4-20mA electrical signal into pneumatic output for precise valve positioning in potentially explosive atmospheres.

Key Features

• ATEX Certification:​ Approved for hazardous areas (Zone 1/2, Ex ia IIC T6/T4 Gb).

• Double-Acting Operation:​ Designed for double-acting actuators with fail-freeze safety function.

• Analog Position Feedback:​ Standard 4-20mA position feedback signal for remote monitoring.

• HART Communication:​ 4-20mA two-wire input with HART protocol for configuration and diagnostics.

• Robust Construction:​ IP65-rated aluminum housing suitable for industrial environments.

Technical Specifications

Model Number Decoding (V18345-1027121001)

• V18345:​ Series identifier for TZIDC positioners

• 1:​ Case/mounting type (1 = aluminum housing, IP65)

• 0:​ Input/communication (0 = 4-20mA with HART)

• 2:​ Explosion protection (2 = ATEX certified, Ex ia IIC T6/T4 Gb)

• 7:​ Output/safe position (7 = double-acting, fail-freeze)

• 1:​ Connections (1 = cable thread 1/2-14 NPT, air pipe 1/4-18 NPT)

• 2:​ Option modules (2 = plug-in analog position feedback module)

• 1:​ Design (1 = standard)

• 0:​ Additional options (0 = standard)

• 0:​ Reserved

• 1:​ Reserved

Key Differences from Previous Models

Compared to the previously discussed V18345 variants:

• V18345-1027121001:​ ATEX certified + double-acting fail-freeze​ + analog feedback (this model)

• V18345-1021521001:​ ATEX certified + double-acting fail-safe​ + analog feedback

• V18345-1010521001:​ Standard version + double-acting fail-freeze + analog feedback

The 1027121001​ configuration combines ATEX certification​ with fail-freeze functionality​ for hazardous area applications where holding the last position on signal loss is required.

Typical Applications

• Control valves in petrochemical and chemical plants (hazardous areas)

• Process control systems in oil and gas facilities requiring fail-freeze function

• Applications where valve movement on signal loss could cause process disruption

• Pharmaceutical and chemical processing in explosive atmospheres

• Systems requiring position monitoring in hazardous environments

Important Selection & Installation Notes

1. Hazardous Area Classification:​ This model is certified for Zone 1/2 hazardous areas. Must​ be installed in accordance with ATEX directives and local electrical codes for intrinsically safe installations.

2. Fail-Freeze Function:​ On signal/power loss, the valve holds its last position (does not move to safe position). Verify​ that this meets your process safety requirements.

3. Actuator Compatibility:​ Designed for double-acting actuators only. Verify your actuator type before selection.

4. Intrinsic Safety Barriers:​ Requires intrinsically safe barriers in the control loop when used in hazardous areas. Follow manufacturer's installation guidelines.

5. Configuration:​ Requires configuration using a HART communicator or ABB configuration software. Note:​ Some configuration functions may be restricted in hazardous area installations.

6. Wiring:​ Use shielded twisted-pair cable with proper grounding. In hazardous areas, follow ATEX wiring requirements and use certified cable glands.

7. Maintenance:​ Only qualified personnel trained in hazardous area equipment should perform maintenance or calibration.

Note: Specifications are based on the TZIDC series data and model number decoding conventions. The exact configuration for this specific model number includes ATEX certification, double-acting operation, fail-freeze function, and analog position feedback. For complete technical data, dimensional drawings, and installation guidelines for hazardous areas, consult the official ABB TZIDC Positioner Technical Manual​ or contact ABB technical support.