Schneider Electric (Barber Colman) AK-42309-500 Relay

The Schneider Electric (Barber Colman) AK-42309-500 is a direct acting pneumatic relay designed for high-precision force-balance position sensing. Built for the rigorous demands of commercial HVACR systems, this positive positioning relay ensures an actuator's stroke remains consistent relative to the signal pressure received from the controller. It effectively handles variations in air pressure and mechanical load, making it a critical component for maintaining accurate damper and valve positioning in complex air-handling units.

This unit features a factory set span of 5 psig and a start point adjustable from 1 to 12 psig, providing the flexibility required for specialized pneumatic sequences. The construction utilizes a durable polysulfone housing and a neoprene diaphragm, engineered for high air capacity and rapid response times via main-air and exhaust connections located at the actuator. As a direct replacement relay for discontinued models including the AK-42309, AK-51309, and AK-52309, the AK-42309-500 streamlines the maintenance of legacy Barber Colman systems without requiring full control refits.

• Universal Compatibility: Includes all necessary mounting linkage for Schneider Electric MKnd series actuators, specifically the MK-2690, MK-3XXX, and MK-88XX series.
• Enhanced Control Precision: Utilizes a sensitive force-balance mechanism that outperforms standard spring-return systems by compensating for actuator friction and high-flow air resistance.
• Optimized Response Time: Integrates large air capacity ports that facilitate rapid pilot-to-output conversion, reducing lag in modulation.
• Broad Operating Range: Supports a span adjustment of 2 to 13 psig, allowing technicians to fine-tune stroke characteristics for specific valve or damper requirements.

• Can I use this with non-Schneider actuators? While primarily designed for MK-series pneumatic actuators, this positive positioner is adaptable to various legacy Barber Colman frameworks using the included linkage kit.
• Is the span fixed? No. Although it is factory set at 5 psi, the span is field-adjustable between 2 and 13 psig to match your specific control sequence.
• Does this include the feedback arm? Yes, the AK-42309-500 is supplied with a comprehensive linkage kit containing the feedback arm and spring required for installation.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.