Johnson Controls A99CB-600 Temperature Sensor

The Johnson Controls A99CB-600 is a high-precision PTC temperature sensor engineered for demanding commercial refrigeration and HVACR applications. Built with a 6-inch stainless steel extended probe and a silicon temperature sensing element, this passive sensor provides a reference resistance of 1,035 ohms at 77?F. The thermistor design ensures consistent accuracy across a wide ambient operating temperature range of -40 to 212?F, making it a reliable choice for defrost termination sensing, condenser fan cycling, and space air temperature monitoring in walk-in coolers or freezers. Featuring a 19' 8-2/5" PVC cable, the A99CB-600 offers significant reach for remote mounting without the need for complex compensation circuits. This Johnson Controls A99 series sensor is fully compatible with A421 electronic temperature controls, System 450 controllers, and various building automation systems, providing a seamless resistance output for precise thermal management in hydronic HVAC and process cooling environments.

• Enhanced Probe Reach: The 6-inch extended 304 stainless steel probe allows for immersion in deeper wells or thicker insulation layers while resisting corrosion.
• Simplified Calibration: Pre-calibrated positive temperature coefficient (PTC) element allows for field replacement without the need for manual controller recalibration.
• Resilient Lead Wire: Equipped with nearly 20 feet of PVC jacketed cable, providing flexibility for HVAC sensors installed in large-scale refrigerated spaces.
• Broad Compatibility: Native integration with Penn/Johnson Controls hardware including MR and MS series multi-stage modules and DX-9100 controllers.
• Environmentally Protected: Designed as a splashproof temperature sensor, ensuring performance in high-humidity evaporator coils and outdoor condensing units.

What is the resistance value of the A99CB-600 at standard room temperature?
This silicon temperature sensor is calibrated to a standard reference resistance of 1,035 ohms at 77?F (25?C). Because it is a PTC sensor, the resistance will increase as the temperature rises.

Can the PVC cable be extended beyond its 19-foot length?
Yes, the A99CB-600 supports cable extension. However, technicians should account for additional wire resistance (typically 0.035 ohms per meter for standard 1mm? wire) to maintain high accuracy in temperature sensing readings.

Is this sensor suitable for immersion applications?
Yes, the 6-inch stainless steel tube is designed for immersion. For pressurized liquid applications or hydronic HVAC systems, it is recommended to use the sensor with a compatible immersion well and thermal conductive paste for ideal response times.

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.