In modern temperature monitoring, two wireless technologies are mainly used today: WLAN and LoRa. Both technologies have their justification – depending on the application, however, they differ considerably in terms of range, energy consumption, and reliability. Especially in demanding environments such as cold storage rooms or large storage areas, LoRa shows clear advantages.
What is the difference between WLAN and LoRa?
WLAN (Wi-Fi) was primarily developed for the fast transmission of large amounts of data – for example, for smartphones, notebooks, or streaming devices. As a result, energy consumption is comparatively high.
LoRa, on the other hand, was specifically developed for IoT applications ("Internet of Things"). The goal is not a high data rate, but particularly energy-efficient and reliable transmission of small data packets over long distances.
This is precisely what is crucial for battery-powered temperature and HACCP sensors.
Significantly longer battery life with LoRa
A major advantage of LoRa sensors is their extremely low energy consumption.
While WLAN sensors regularly have to maintain an active connection to the WLAN network and thus continuously consume energy, LoRa sensors "sleep" most of the time. They only wake up briefly, transmit their measurement data, and then switch back to an energy-saving sleep mode.
This allows for battery life of several years, depending on the measurement interval.
Especially in a professional environment, this offers enormous advantages:
- significantly fewer battery changes
- lower maintenance effort
- lower operating costs
- higher reliability
- ideal for hard-to-reach installation locations
Especially in cold storage rooms or freezer areas, this is a great advantage, as battery changes there are often complex and time-consuming.
Why LoRa often works more reliably in cold storage rooms
Cold storage rooms place high demands on wireless technologies. Many operators are familiar with the problem:
- unstable WLAN connections
- poor signal strength
- connection interruptions
- data gaps
The reason often lies in the construction of modern cold storage rooms.
Cold storage rooms act like a Faraday cage
Many cold storage rooms consist of large metal panels and insulated steel structures. This construction strongly shields radio waves.
This is often referred to as a Faraday cage.
A Faraday cage is an electrically conductive metal enclosure that shields or greatly reduces electromagnetic waves. This makes it difficult for radio signals to enter or exit.
The problem:
WLAN operates at comparatively high frequencies, which are more sensitive to shielding and obstacles.
LoRa, on the other hand, was specifically developed for long ranges and difficult radio conditions. The technology uses lower frequency ranges and particularly robust signal modulation. This allows LoRa signals to:
- penetrate walls better
- overcome metal structures
- cover long distances
- maintain stable connections in difficult environments
Especially in cold storage rooms, production facilities, or warehouses, this difference often becomes very clear in practice.
Less infrastructure needed
Another advantage of LoRa is its high range.
Often, a single centrally placed gateway is sufficient to cover:
- several cold rooms
- storage areas
- production areas
- or entire buildings
.
With WLAN solutions, on the other hand, several access points or repeaters are often necessary to ensure sufficient network coverage.
With LoRa, this reduces:
- installation effort
- network costs
- maintenance effort
- infrastructure complexity
When WLAN can still make sense
WLAN sensors can still be useful, for example:
- for very short transmission intervals
- if a stable WLAN infrastructure is already in place
- for applications with permanent power supply
- or if very large amounts of data need to be transmitted
For classic temperature monitoring and HACCP documentation, however, the advantages of LoRa outweigh those of WLAN in many professional applications.
Conclusion
For professional temperature monitoring in demanding environments, LoRa offers clear advantages over WLAN in many cases:
- significantly longer battery life
- higher range
- more stable radio connections
- better penetration of cold storage rooms and metal structures
- lower maintenance effort
- less infrastructure needed
Especially in cold storage rooms, freezer areas, and large storage areas, LoRa plays to its technical strengths and enables reliable and energy-efficient temperature monitoring over many years.
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