Johnson Controls P499ACP-101 Pressure Transducer

The Johnson Controls P499ACP-101 is a high-performance electronic pressure transducer engineered for precision sensing in demanding HVACR environments. Built for professionals who need reliable data for head pressure control or suction line monitoring, this unit features a 0-100 PSI pressure range and delivers a standard 4-20 mA output signal. The hardware is constructed from a single-piece 17-4PH stainless steel pressure port, effectively eliminating the common failure points associated with O-rings and welds. This robust design ensures a leak-proof, all-metal seal that remains compatible with nearly all non-corrosive refrigerants, including ammonia.

For seamless field installation, the P499ACP-101 utilizes a 1/4" SAE flare internal thread with depressor (Style 47), allowing for direct mounting without specialized tools. Its environmentally protected electronics are digitally compensated to maintain a 1% Total Error Band, even when subjected to extreme temperature swings, high humidity, or icing. Whether you are managing industrial process controls or commercial refrigeration cycles, this transducer provides the repeatable accuracy required to optimize system efficiency and prevent equipment downtime.

• Extreme Durability: The 17-4PH stainless steel construction resists physical shock, high-frequency vibration, and pressure pulsations.
• Precision Accuracy: Features a ?1% full span accuracy over a wide compensated temperature range of -4?F to 185?F.
• Simplified Installation: The slender body design facilitates the use of deep-socket wrenches in tight clearances.
• Broad Media Compatibility: Validated for use with refrigerants, water, glycol, and corrosive media that do not degrade stainless steel.
• Reduced Refrigerant Loss: A machined, weldless port design prevents leaks often found in cheaper alternative sensors.

What is the proper wiring for the 4-20 mA output?
The P499ACP-101 operates on a 9-30 VDC supply. Using a standard Packard connector, the current signal should be measured in series with the control input to verify linear scaling across the 0-100 PSI range.

Can this transducer be used on the high side of a system?
While this model is rated for a maximum working pressure of 2x its range, it is specifically designed for 0-100 PSI applications, typically making it ideal for suction lines or low-side monitoring rather than high-pressure discharge lines.

Does it require a specific orientation when mounting?
To prevent oil or sediment from accumulating in the internal sensing element, it is best practice to mount the pressure control in an upright position on the topside of refrigerant lines.

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.