Freon Alarm (Refrigerant Leak Alarm) - SKA/NE-301(R 134 a)

Freon alarm (refrigerant leakage alarm)

Freon alarm, also called refrigerant/coolant detector, is specifically used to detect the leakage concentration of Freon (R22/R134a/R404A/R410A/R32, etc.) in the air. Freon is colorless and odorless, and the human eye cannot directly detect leaks. After leakage, it can easily cause personnel hypoxia and suffocation; refrigerants such as R32 are also flammable and pose an explosion risk when encountering open flames, while also causing refrigerant loss and environmental pollution, so cold storage, refrigeration machine rooms, and central air-conditioning machine rooms need to install monitoring.
✅ Working principle
Mainstream uses NDIR non-dispersive infrared sensor (most commonly used in industrial fixed type): Freon absorbs infrared light at specific wavelengths, and the sensor detects changes in light intensity to convert into gas concentration, with high precision, resistance to water vapor, and long lifespan;
There are also semiconductor/halogen heated diode types, mostly used in handheld leak detectors, suitable for on-site leak point location;
The complete fixed system consists of a detector (on-site probe) + alarm controller (main unit). The detector collects concentration signals and transmits them to the main unit; when the concentration reaches the low alarm and high alarm thresholds, the main unit triggers audible and visual alarms, and can link to exhaust ventilation, cut off the refrigerant solenoid valve, and shut down the refrigeration unit. Some support remote mobile phone/monitoring room alarms.
📌 Product Classification
Fixed Freon alarm (industrial mainstream)
24-hour online continuous monitoring, wall-mounted installation, used in cold storage, refrigeration rooms, data center air-conditioning rooms, large supermarket cold cabinet rooms; supports 4-20mA, RS485 signal access to PLC / fire protection systems, explosion-proof models used in hazardous areas.
Portable handheld leak detector
With a flexible gooseneck probe, used by maintenance personnel for inspections and leak detection; used to find tiny leaks in pipeline valves and flanges, not for long-term online monitoring.
Standalone simple alarm
Plug and play, with built-in sound and light, simple monitoring for small machine rooms and small air-conditioning machine rooms.
🧪 Detectable Refrigerants
R22, R134a, R404A, R407C, R410A, R507, R32 and other halogenated hydrocarbon refrigerants (Freon-type refrigerants).

Freon alarm (refrigerant leakage alarm)
📍 Installation Points (Very Critical)
Freon has different densities, so installation heights differ:
R22, R404A (heavier than air): detector 0.3~0.6m above the ground, sensor facing downward;
R410A, R134a, R32 (lighter than air): the detector is installed 0.3~0.6m below the ceiling;
Probes should preferably be arranged near compressors, valves, flanges, pipe joints, and other locations most prone to leakage;
The controller (main unit) is installed in the duty room, about 1.5 meters above the ground, for convenient viewing by personnel.
⚠️ Main function
Safety warning: audible and visual alarm when leakage exceeds the standard, preventing hypoxia and suffocation in enclosed spaces; R32 flammable refrigerant can prevent explosion risks;
Linkage control: automatically turn on exhaust fans, cut off the refrigerant pipeline solenoid valve, and shut down the machine to reduce leakage;
Reduce economic losses: early leak detection avoids massive refrigerant loss and refrigeration unit damage;
Compliance acceptance: cold storage implements GB/T28009-2025, and refrigeration machine room regulations require the installation of refrigerant leakage alarm devices as a safety inspection acceptance item.
🛠️ Maintenance Points
Regular calibration (generally once a year);
Avoid large amounts of water vapor, oil contamination, and strong electromagnetic interference;
Infrared sensor lifespan is about 5 years, and the sensor needs to be replaced when due