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  Updated: 10 May 2020


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Freeze- and refrigeration companies save time and costs in the future.

For leakage monitoring in refrigerators and freezers, you do not need to hire specialist companies for detector replacement.

Coolants are often very toxic and harmful to the environment. Therefore undesirable leaks of refrigerants must be avoided.

Gas detectors in the immediate vicinity of the plant continuously detect unwanted gas leaks.

In connection with gas leak units and its gas detectors and associated warning devices, people are primarily protected, but also the cooling plant itself.

Both in supermarkets with air conditioning, in breweries or at vineyards - even the smallest leaks must be immediately detected, located and reported.

The gas detectors from the AP are specially optimized for different refrigerants working very selectively in the risk zone.

The continuous leakage check is mandatory according to EN 378 for systems with a capacity of more than 50 kgs.

Measurement principle
Mostly, detectors operate according to the semiconductor principle, on electrochemical or infrared basis.

Semiconductor detectors that reach an ammonia air mixture cause a change in conductivity, which is converted by electronics into a signal.

Conductivity is dependent on the ammonia concentration in the air.

When the preset alarm levels are exceeded, an alarm is triggered.

Electrochemical detectors are also used. They are generally more expensive than semiconductor detectors, but  have a lower cross-sensitivity and are mainly used where the influence of substances other than ammonia can trigger false alarms.

NH3 / freon / CO2 detectors from Automatic Products for leakage monitoring of refrigeration and freezing plants.

Important national and international regulations.

All in all, refrigeration and air conditioning systems have important international, national and EU regulations for the use of virtually all known refrigerant gases.

These rules aim at minimizing the risks in the three main areas that affect human health and safety, the ozone depletion and other environmental impacts as well as potential damage to property from fire or explosion.

For operators and their cooling and air conditioning technicians and service partners, there is a fourth factor that is equally important from a practical perspective, namely costs.

The leakage of refrigerant costs money.

The cost of refrigerant gases has risen sharply over the past decade, and most companies in the refrigeration and air conditioning industry only know too well that filling up coolant leaks can reach up to 70% of annual sales. 

Different solutions for refrigerant detection
Automatikprodukter market perfectly matched detectors, control and warning systems that can be combined in many ways for monitoring and alerting.

This ensures optimum protection for people in critical situations in confined spaces.

Individually configurable and flexible integrated solutions come from AP and are available in a variety of applications.

The CO2 detectors have a temperature control circuit and an internal heating element to maintain the detector within its normal operating range even if the temperature in the refrigerator/freezer storage is as low as -35 degrees.

The detector's response time is 10 seconds.

The new replacement detector XChange
Gas detectors are generally reliable and resilient, but have a limited service life and must be checked at least once a year, maintained and calibrated.

Previously, you had to hire an authorized cooling technician from a manufacturer's authorized specialist company.

For some parties, this meant a rather ineffective activity: the plant installer normally got no compensation.

With the new replacement detector from AP, the user or the refrigeration company can easily replace it without using specialist assistance.

This not only saves time and money but also creates an independence.

This means reduced maintenance costs of up to 50%.







Analog detector, AFR - Wall











Analog detector, AFR - Duct














SFR, Stand Alone detector - Wall
ModBus, Analog, Relay Output




Underst. Art/Science  

  Manual RS485 RS485  
    SIL2 CE  
    Declaration Declaration  

SFR, Combi detector - Duct
 ModBus, Analog, Relay Output



Calibr. Duct  





SFR can be provided with
two additional detectors


Different ways of construction






Gas alarm plate for carbon dioxide detector


















Warning Siren for carbon dioxide sensors























AP offers reliable detectors, gas leak units and warning systems for refrigeration and freeze systems.




The instrumentized multi-point gas monitoring system is based on detectors providing a gas monitoring center with a signal related to the gas concentration.

The signal is then processed at the gas monitoring center where any measurement, alarm and control functions are obtained.

The most common appearance of a gas monitoring facility of this type and for several measurement points is the CGD central.

More in this link

Desired system features
No matter what type of gas monitoring facility you choose, we recommend that you look at the following features:


Should the system have one or two alarm levels per detector?

Control signals:

Should the system have one relay per alarm level and sensor?
Should relays have time lag?
Should the system have a computer output?


Should it be possible to read alarm values?
Should it be digital, analog or a flashing gas alarm sign?


Should the plant itself be able to identify sensor failure, power failure and instrument failures


Should the system have a battery backup?

The exchangeable sensor X-CHANGE turns the recalibration into a home game:

  • Delivery of recalibrated sensor cartridges

  • Easy exchange, no specialized company needs to come to you

  • Available for every gas type

  • At guaranteed exchange prices

  • Increased reliability (SIL2-software)

  • Important time and cost savings

The X-Change support guarantees a price based on the consumption of the sensor capacitance.

For each uncalibrated sensor returned to AP, you will receive a credit for the unused capacity of the sensor.

More >

Legal and safety requirements
The devices are manufactured according to the regulations and various directives such as EN 50545, etc.

Products delivered by AP meet and even exceed the new European Standard EN 50545.

The safety features check the connected warning devices on functionality and open circuit day and night (Level SIL2 according to EN 50271).


 BFR, Field Bus detector - Wall
Modbus, CG-bus






  Declaration Datasheet  



BFR, Fieldbus detector - Duct
Modbus, CGD-bus




Underst. Art &  




RS485 Science  
    Environm. Duct  
    declaration Kit  



Gas Leak Unit, CGD










Quick and easy replacement of sensor



  1. Open the housing with a screwdriver.

  2. Disconnect the sensor cable and unscrew the disused sensor head.

  3. Exchange the sensor cartridge (3) and connect the cable of the new sensor head to the PCB.

  4. Close cover of the housing with the screws (1). The recalibrated sensor is ready for use at once.





Electrical products in an explosive environment
A small amount of energy - a flame, spark, high surface temperature or similar is required to ignite an explosive gas mixture.

Products installed in an area with a potential explosion hazard must of course in themselves  not be a potential explosion hazard.

For this reason, the products are manufactured in such a way that this cannot occur.
The equipment must also be labeled and tested - ATEX classified - by the approved testing authority.

The Ex-class information is available in "Swedish Standard"
The choice of which Ex-classification is required is determined by factors such as type of gas, permissible maximum surface temperature and potential explosive hazards in the area where the products are to be installed.

The potential explosion hazard in the different areas is determined by the zone classification according to "Swedish Standard".

More about ATEX-products can be found under CO2/ATEX

CFR, Combi detector - Wall
ModBus, Analog, Relay Output




Underst. CFR  

declaration RS485 RS485 Datasheet  


CFR, Combi detector - Duct
 ModBus, Analog, Relay Output




CE Duct  







E-mail: lars@fjellcom.se     

Phone: +46(0)31-287202

Mobile: +46(0)706-755561



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