A3 R290 Refrigerant Leak Detection Sensor - R1

NDIR-based propane gas detection module for A3 flammable refrigerants

The MAXMAC A3 R290 Refrigerant Leak Detection Sensor - R1 is an NDIR gas sensor module designed specifically to detect leaks of A3 R290 refrigerant (propane). It is suitable for HVAC and refrigeration systems, including heat pumps, commercial refrigeration, cold-chain equipment and industrial safety monitoring.

  • NDIR infrared detection technology
  • -40°C to 90°C wide operating temperature range
  • 0-100% LFL measurement range with 0.1% LFL resolution
  • ≤10s warm-up time and ≤20s response time
  • ≥15-year service life, with RS485 and customized LIN 2.1 / CAN interface integration support
A3 R290 Refrigerant Leak Detection Sensor - R1 NDIR propane gas detection module
Sensor Detection Principle
R290 Leak Detection Principle Diagram
NDIR R290 propane refrigerant leak detection principle diagram
Technical Specifications
A3 R290 Refrigerant Leak Detection Sensor - R1
Product Name
A3 R290 Refrigerant Leak Detection Sensor - R1
Operating Principle
Non-dispersive Infrared (NDIR)
Target Gas
R290
Measurement Range
0-100% LFL
Resolution
0.1% LFL
Measurement Interval
4 s
Accuracy
±2.5% LFL @ 0%-25% LFL
±5% LFL @ 25%-70% LFL
±10% LFL @ 70%-100% LFL
Warm-up Time
≤ 10 s
Response Time
≤ 20 s (T25%)
Service Life
≥ 15 years
Operating Voltage
5.0 VDC / customization supported
Operating Current
Average 16 mA, peak 300 mA (pulse width <10 ms / measurement cycle)
Operating Temperature
-40°C to 90°C
Operating Humidity
5%-95% RH, non-condensing
Storage Temperature
-40°C to 95°C
Dimensions
72 mm × 71 mm × 19 mm
Weight
Approx. 25 g
Interface
RS485 / customized LIN 2.1 / CAN supported
Applicable Equipment
  • R290 air conditioning systems
  • R290 heat pump equipment
  • Commercial refrigeration equipment
  • Cold storage and cold-chain systems
  • Refrigerated cabinets and display cases
  • Ice machines
  • Industrial refrigeration plant rooms
  • HVAC unit safety monitoring
  • A3 flammable refrigerant leak alarm systems
Applications
A3 R290 refrigerant leak detection sensor for industrial safety monitoring

Industrial Safety and Environmental Monitoring

Suitable for heat pump equipment production, refrigeration system assembly, laboratory testing, industrial refrigeration plant rooms and related safety monitoring environments. It continuously monitors A3 refrigerant R290 (propane) concentration. R1 can be linked with ventilation systems, alarm devices, equipment controllers and safety protection systems to help users detect A3 flammable refrigerant leak risks early, reduce safety hazards caused by propane gas accumulation, and protect personnel, equipment and production environments.

A3 R290 refrigerant leak detection sensor for cold-chain and refrigeration systems

Cold Chain and Refrigeration System Leak Detection

Suitable for cold storage, refrigerated cabinets, ice machines, heat pump units, commercial refrigeration equipment and HVAC systems using R290 refrigerant. It monitors A3 R290 refrigerant (propane) leakage in real time. Through a fast response mechanism, R1 can trigger leak warnings, fan interlock control, automatic shutdown protection or remote alarms, helping operation and maintenance teams troubleshoot faults earlier, reduce downtime risk, and improve refrigeration system safety and stability.

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