A99BB-25C Johnson Controls Sensor

Overview

The Johnson Controls A99BB-25C is a passive Positive Temperature Coefficient (PTC) silicon temperature sensor designed to deliver accurate and reliable temperature monitoring in demanding environmental control applications. Featuring a splashproof design and a durable stainless steel probe, this sensor provides high precision and operational stability without requiring frequent recalibration, making it ideal for integration with modular control systems like the Johnson Controls System 450.

Features

• High-accuracy sensing element ensuring precise temperature monitoring
• Calibrated PTC thermistor element allowing easy sensor exchange without recalibration
• Durable stainless steel probe design that resists corrosion in varied environments
• Splashproof construction suitable for moisture-prone commercial applications
• Lead length extendable up to 800 feet (244 meters) for flexible installation options

Specifications

• Sensor Type: Passive Positive Temperature Coefficient (PTC) Silicon Sensor
• Sensing Temperature 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)
• Cable Type: PVC jacketed cable, 9-3/4 inches (0.25 meters) length
• Lead Wire Gauge: 22 AWG
• Maximum Allowable Bulb Temperature: 257 °F (125 C)
• Ambient Operating Humidity: 0 to 100% RH, condensing

Applications

• Commercial refrigeration units including walk-in coolers, reach-in coolers, and freezers
• Supermarket display cases and climate-controlled storage environments
• HVAC system monitoring including space, return air, and outdoor air temperature sensing
• Defrost termination temperature sensing
• Condenser fan cycling control strategies