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Hybrid Sensor for Refrigerated Containers – CO2, O2 & Humidity

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Hybrid sensor for refrigerated containers combining CO2, O2 and humidity measurement in one housing. Features NDIR and Luminescence Quenching detection and RS485 Modbus integration.
Hybrid Sensor – CO2, O2 and humidity measurement for refrigerated containers in one unit.

Application

The Hybrid Sensor for refrigerated containers combines CO2, O2 and humidity measurement in one housing — one mounting point, one plug, one Modbus RTU connection, instead of a separate sensor for each measurement. Designed for reefer units and controlled atmosphere shipping, it delivers accurate gas and humidity data for cargo monitoring while simplifying installation, wiring and service.

Common use cases include:
✓ Controlled atmosphere (CA) transport – One sensor covers CO2, O2 and humidity monitoring in reefer units.
✓ Reefer and container manufacturers – One installation point and one Modbus RTU connection simplify design, wiring and service.
✓ Fruit and vegetable shipments – Accurate gas and humidity data to support optimal atmosphere conditions during transport.
✓ Cold chain logistics – Real-time readings over RS485 Modbus for cargo monitoring during long-haul transport.

➡ Contact us to integrate the Hybrid Sensor into your refrigerated container designs: https://www.kp-as.com/contact/ 

Properties

✓ Three Measurements in One Housing – CO2, O2 and relative humidity in a single unit: one mounting point, one plug, one Modbus RTU connection.
✓ NDIR CO2 Measurement – Dual-wavelength non-dispersive infrared for high-accuracy CO2 detection, 0-20% CO2.
✓ Luminescence Quenching O2 Measurement – Precise, stable oxygen measurements with minimal drift, 0-25% O2, reducing maintenance needs compared to traditional Zirconia sensors.
✓ Capacitive Humidity Measurement – Sensirion SHT30/SHT31 chip, 0-100% RH (condensing) with fast response time <8 sec.
✓ Intelligent Compensation – Built-in barometer and temperature sensor continuously correct the gas readings, so CO2 and O2 are displayed as true Vol%.
✓ Calibration During Reefer PTI – Recommended 1-year interval, calibration in ambient air with barometric correction.
✓ RS485 Modbus Communication – Seamless integration into reefer control systems for real-time monitoring.
✓ Robust & Condensation-Resistant – IP67-rated with PTFE filter protection, salt spray, vibration and shock tested for harsh maritime conditions.
✓ Plug and Play Installation – Integrated Deutsch DT04 connector, protected against overvoltage, reverse polarity and miswiring.