Johnson Controls P499ACS-404 Pressure Transducer

The Johnson Controls P499ACS-404 is a high-precision electronic pressure transducer engineered for demanding commercial refrigeration and HVAC applications. It features a rugged 17-4PH stainless steel construction with a single-piece machined pressure port, eliminating internal O-rings or welds to ensure a leak-proof seal against standard and A2L/A3 refrigerants. This specific model provides a 4 to 20 mA output signal and is calibrated for a 0 to 30 bar pressure range, making it a drop-in replacement for the P499ACS-404C. Designed for reliability in harsh environments, its environmentally sealed electronics resist the effects of condensation, icing, and high-side pressure pulsations. The 1/4" SAE 45-degree flare external thread allows for direct mounting to pressure tap ports without complex brackets. Equipped with a 2-meter shielded cable, it maintains signal integrity by minimizing electromagnetic interference in dense mechanical rooms. This transducer is a critical component for technicians requiring repeatable performance in refrigerant pressure monitoring and system automation.

• Hermetic Reliability: The 17-4PH stainless steel build eliminates leak paths common in transducers using organic seals or welds.
• Broad Compatibility: Suitable for all pressure media compatible with stainless steel, including ammonia, CO2, glycol, and water.
• Interference Protection: Integrated shielded cable electrical connection ensures a stable mA signal over long distances.
• Environmental Resilience: Rated to withstand extreme ambient temperature swings, humidity, and vibration typical in compressor discharge lines.
• Direct Retrofit: Identical specifications to the P499ACS-404C ensure seamless integration into existing control architectures.

Is the P499ACS-404 compatible with ammonia systems?
Yes, the 17-4PH stainless steel wetted parts are fully compatible with ammonia and other non-corrosive refrigerants.

Can this transducer be used on the high-pressure side of a compressor?
Yes, it is designed to handle pressure pulsations, though it is recommended to mount it away from direct compressor discharge to maximize service life.

What is the difference between the 404 and the 404C models?
The P499ACS-404 and P499ACS-404C are functionally and physically identical; the "C" suffix typically denotes bulk or commercial packaging in distribution.

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.