In cold storage and ice manufacturing plants, ammonia, also known as NH3, is widely used as an industrial refrigerant. It offers strong refrigeration performance, but ammonia leakage can create serious safety risks for workers, equipment and daily plant operation.
For this reason, a fixed NH3 gas detection system is an important part of industrial refrigeration safety. The key question for many engineers and plant owners is:
Where should NH3 gas detectors be installed?
The answer depends on the possible leakage points, gas movement direction and site layout.
The refrigeration machine room is one of the most important areas for NH3 gas detection.
This area usually contains compressors, valves, refrigeration equipment, control cabinets and ammonia pipelines. If leakage occurs inside the machine room, ammonia gas may accumulate quickly, especially when ventilation is limited.
NH3 gas detectors should be installed near possible leakage points in the refrigeration machine room, such as compressor units, valve groups, pipe joints and refrigeration equipment connections.
Because ammonia is lighter than air, the detector should normally be installed above the potential leakage source or in the upper area where ammonia may accumulate. The sensor head should face downward for stable gas sampling and easier maintenance.
The compressor room is another high-risk area in ammonia refrigeration systems.
Compressors operate continuously and are connected with ammonia pipelines, valves and mechanical sealing points. During long-term operation, leakage may happen due to vibration, pipe connection problems, aging seals or maintenance work.
Installing NH3 gas detectors near ammonia compressors helps detect leakage at an early stage. Once ammonia concentration reaches the preset alarm level, the detector can send a signal to the gas control panel through 4-20mA, RS485 Modbus RTU or relay output.
This allows the system to provide alarm indication and support linkage with ventilation fans, sounder beacon alarms or other emergency response equipment.
Ammonia valve stations are key monitoring points because valves are frequently operated and connected to multiple pipelines.
Leakage may happen around valve stems, flanges, joints or maintenance points. For this reason, NH3 gas detectors should be installed close to ammonia valve stations where gas leakage is most likely to occur.
The installation location should be easy to access for inspection, testing and calibration. According to practical engineering requirements, the detector should also be installed away from strong vibration, impact and strong electromagnetic interference.
Ammonia pipeline areas should also be considered during detector layout design.
Pipeline leakage may occur at welded joints, flanges, elbows, pressure-regulating points or areas with mechanical stress. In cold storage and ice plant projects, long ammonia pipelines may pass through machine rooms, technical corridors or equipment areas.
NH3 gas detectors should be arranged near important pipeline sections and connection points. The purpose is not only to detect leakage, but also to help operators identify which area may have a gas concentration abnormality.
For engineering projects, multiple detectors can be connected to a gas control panel for centralized monitoring.
In some cold storage facilities, evaporators are installed inside or near refrigerated spaces.
If ammonia is used in the refrigeration system, the evaporator area may become a potential leakage point. The detector layout should be evaluated according to the system design, equipment position, airflow direction and maintenance access.
When installing detectors near evaporator areas, engineers should avoid direct water spray, heavy condensation or locations where ice may affect the sensor performance. The detector should also have enough clearance for maintenance and calibration.
Cold storage facilities often have technical areas where refrigeration equipment, pipelines, valves and control devices are installed.
These areas may not be visited frequently by operators, so continuous gas monitoring is especially important. NH3 gas detectors can provide real-time monitoring and transmit alarm signals to the control panel when abnormal ammonia concentration is detected.
For industrial refrigeration applications, detector placement should follow a simple principle:
Install the detector where ammonia leakage is most likely to occur and where gas may accumulate.
Ice manufacturing plants use refrigeration equipment to support continuous ice production. Ammonia leakage may affect production safety, worker safety and equipment operation.
NH3 gas detectors should be installed around refrigeration equipment, compressor areas, valve stations and pipe connection points related to the ice production process.
For example, in an ice manufacturing plant, detectors can be arranged around:
Refrigeration compressor units
Ammonia valve groups
Pipeline connection areas
Equipment rooms
Technical service areas
Ice production refrigeration sections
This helps the plant build a continuous ammonia leakage monitoring system for daily operation.
Food processing factories may also use ammonia refrigeration systems for cooling, freezing and storage.
NH3 gas detectors are suitable for installation in refrigeration rooms, cold storage areas, processing refrigeration equipment rooms and ammonia pipeline areas.
By using fixed ammonia gas detectors, the facility can improve safety management and reduce the risk of undetected gas leakage.
The ANWETECH AT-EG01 NH3 gas detector is designed for fixed gas leakage monitoring in industrial applications. According to the target gas and project requirement, the detector can be configured for ammonia gas detection and installed at key risk points in cold storage and ice manufacturing plants.
Main features include:
Real-time gas concentration monitoring
DC24V power supply
4-20mA analog signal output
RS485 Modbus RTU communication
Passive relay contact output
Two-level alarm output
Die-cast aluminum housing
Explosion-proof design: Ex d IIC T6
Ingress protection: IP66
Operating temperature: -40°C to +70°C
Suitable for hazardous and industrial environments
The detector can be connected to gas control panels, PLC systems, ventilation systems, sounder beacon alarms and other industrial safety control equipment.
For better detection performance, engineers should consider the following points during installation:
Install the detector near possible NH3 leakage sources
Install above the leakage source because ammonia is lighter than air
Keep the sensor head facing downward
Avoid strong vibration and impact
Avoid strong electromagnetic interference
Keep enough space for maintenance and calibration
Keep suitable clearance from surrounding pipes and equipment
Ensure correct DC24V power wiring and signal connection
Perform regular inspection and calibration
