A99BB-300C Johnson Controls Sensor

Overview

The Johnson Controls A99BB-300C is a passive, positive temperature coefficient (PTC) silicon temperature sensor designed to deliver accurate and reliable temperature measurements in commercial HVAC and refrigeration systems. It features a splashproof, stainless steel sensing probe and comes with a 9-3/4 foot (3 m) PVC cable. Each element is precisely calibrated to ensure consistent performance, allowing for easy sensor replacement without requiring recalibration of the connected electronic control modules.

Features

• High Accuracy: Features a precisely calibrated sensing element providing excellent accuracy across a broad operating envelope.
• Durable Construction: Built with a rugged stainless steel sensing bulb to withstand corrosion and physical wear.
• Splashproof Design: Engineered to resist moisture ingress, making it suitable for wet or humid environments.
• Versatile Extension: Lead wire length can be extended up to 800 feet (244 meters) without necessitating complex compensation circuits.
• Broad Compatibility: Designed for seamless integration with Johnson Controls System 450, System 27 NOVA, MR/MS series, and other electronic control modules.

Specifications

• Sensing Range: -40 to 212°F (-40 to 100°C)
• Reference Resistance: 1,035 ohms at 77°F (25°C)
• Sensor Accuracy: ±0.9°F (±0.5°C) between 5 and 167°F (-15 and 75°C)
• Lead Wire Length: 9-3/4 feet (3 meters)
• Lead Wire Insulation: PVC cable
• Lead Wire Gauge: 22 AWG
• Maximum Allowable Bulb Temperature: 257°F (125°C)
• Enclosure/Probe Material: Stainless steel probe

Applications

• Refrigeration Systems: Ideal for temperature monitoring in freezers, walk-in coolers, reach-in coolers, and display cases.
• Defrost Control: Used as a defrost termination temperature sensor to optimize defrost cycles.
• Condenser Protection: Suitable for managing condenser fan cycling based on temperature parameters.
• Space and Environmental Monitoring: Applied in return air, space temperature sensing, and outdoor air sensing applications.
• Process Automation: Utilized for temperature control within industrial process cooling and heating systems.