Johnson Controls P499RAP-101 Pressure Transducer

The Johnson Controls P499RAP-101 is a high-accuracy electronic pressure transducer designed for mission-critical HVACR applications. Engineered with a rugged stainless steel construction, this 0-100 PSI pressure sensor provides a reliable 0.5-4.5 VDC ratiometric output, ensuring precise monitoring of HVAC refrigerants and non-corrosive liquids. This specific model features a 1/8" NPT external thread (Style 49) connection, making it high-compatible with standard manifold and pipe fittings. The P499 series utilizes thin-film sensing technology to maintain signal stability across a wide temperature range, resisting the effects of vibration and pressure spikes that often cause failure in lower-grade components. As a direct P499RAP-101 replacement for legacy models like the P399AAA-1 and the P499RAP-101C, this unit allows for seamless field integration without recalibrating the entire control loop, provided the input voltage remains constant. It is a standard component for refrigeration pressure control in commercial chillers and condensers.

• Optimized Compatibility: Direct field replacement for P399AAA-1 and P499RAP-101C units, reducing downtime during service calls.
• Durable Construction: Stainless steel dampening system protects the transducer diaphragm from hydraulic shock and pressure pulsations.
• Signal Precision: The 0.5 to 4.5 VDC output delivers high-resolution data to building automation systems and standalone controllers.
• Environmental Rating: Built to withstand moisture and condensation common in refrigeration environments, maintaining linear pressure sensing accuracy.
• Compact Profile: The Style 49 body design fits into tight mechanical spaces where larger gauges or switches often interfere with piping.

Is the P499RAP-101 compatible with ammonia systems?
No, this transducer is designed for use with non-corrosive refrigerants and liquids. For ammonia applications, a different alloy sensor must be used to prevent chemical erosion of the pressure sensor internally.

What is the wiring configuration for the ratiometric output?
The Johnson Controls P499 typically uses a three-wire arrangement: supply voltage, common ground, and the signal output. Always verify your controller?s input impedance matches the transducer?s specifications for accurate 0-100 PSI scaling.

Does this unit require field calibration?
The unit is factory-calibrated for high linearity across the 0.5-4.5 Vdc signal range. If your readings are off, check your supply voltage first, as ratiometric sensors are dependent on a stable 5V input from the controller.

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.