For the cold chain, Internet of Things (IoT) sensors act as the first line of defense by continuously generating valuable condition information. Even small fluctuations in temperature can reduce shelf life. Food manufacturers and distributors would be wise to utilize this solution.
Common Challenges Within the Cold Chain
The cold truth about conventional temperature monitoring is that it’s error-prone. Personnel receiving trucks for grocery stores record temperature gauge information on a paper ledger attached to a clipboard. They may enter those figures into a digital spreadsheet, but the process is largely manual, which entails significant reliability flaws.
The recorded value upon arrival does not reflect the shipment’s actual temperature history. Spoiled food has significant implications for human health. Inaccurate readings, miscommunications, information gaps and noncompliance are common problems in the cold chain. Human error and disparate recordkeeping systems exacerbate the issue.
Even slight temperature excursions can significantly impact product quality. While most food spoilage microbes thrive in the 68° Fahrenheit to 104° Fahrenheit temperature range, they can grow rapidly in the temperature danger zone, which is just a few degrees away from the ideal refrigerator temperature.
How Existing Cold Chain Solutions Fall Short
Food produced for human consumption cannot reach consumers when temperature abuse during storage supports spoilage and the growth of pathogenic bacteria. Since even minor deviations can cause issues, conventional data loggers no longer meet industry needs. They are unreliable at best and erroneous at worst.
Say a temporary power outage occurs. By the time the refrigerated truck arrives at its destination, the thermometer may display an acceptable temperature, while the containers are still in the temperature danger zone. The discrepancy between the fridge and packaging temperatures could impact product quality.
IoT sensors enable precision monitoring. In one study on table grapes — which are exceptionally sensitive and must remain at negative 33 ° Fahrenheit — researchers found inadequate airflow in containers can create hot spots. The temperature between the control and ventilated units deviated by around 30% on average.
The researchers demonstrated the superiority of existing monitoring solutions. Industry professionals need an accurate, reliable solution to ensure product safety and quality. This has never been more crucial, as consumer awareness regarding healthy eating and wellness is on the rise. Organic food sales reached $63.8 billion in 2023 alone.
IoT Technology Is Your First Line of Defense
Many companies ship temperature-sensitive products using coolants such as dry ice — the solid form of carbon dioxide (CO2) — to maintain a stable, low-temperature environment while in transit. Solid CO2 creates no waste or water, making it safe to include in shipments.
Several factors can influence dry ice’s effectiveness, posing a problem since precise control is crucial. Generally speaking, dry ice sublimates at a rate of 8% every 24 hours, converting from a solid to a gas.
This process may occur more quickly, depending on the material’s size and shape. Blocks boast the slowest sublimation rate and longest shelf life among all types, making them ideal for most distribution applications. However, pellets are excellent for flash-freezing in case the truck’s cooling mechanism malfunctions.
Regardless of the type used, the temperature inside a container can change during the sublimation process. If the sublimation rate is significantly higher than expected, spoilage may occur. This is where IoT comes in. It offers an unprecedented level of visibility into the cold chain, helping mitigate temperature excursions in real time.
Implementing IoT Sensors for the Cold Chain
Since modern IoT sensors are discreet and affordable, implementation is relatively straightforward. Sensors — regardless of the type — cost just 40 cents on average. Businesses can continue relying on cost-effective, reliable solutions like dry ice because they can easily retrofit their fleets instead of overhauling them.
For the cold chain, IoT sensors are the first line of defense. They make temperature logging more convenient, accurate and inexpensive. Professionals can track shipments’ conditions in real time as the technology establishes a comprehensive, verifiable record.
They can go beyond temperature monitoring, measuring metrics like humidity, location, truck door status and water leakage. In addition to enhancing recordkeeping, this technology enables proactive intervention. For example, decision-makers can adjust a truck’s route to avoid a delay or extreme weather conditions.
As a result, food manufacturers reduce spoilage and wastage. Expenses associated with shipping will decrease, as they will no longer need to compensate for product losses. Increased visibility supports data-driven strategies, ensuring safety, quality and compliance.
Considerations for Effective Implementation
While standard IoT temperature sensors for the cold chain are effective, industry leaders should consider implementing the latest, most advanced solutions to maximize their returns. Either way, implementation should be relatively straightforward.
One research group developed a cost-effective temperature and humidity monitoring system built on IoT services and long-range, wide-area (LoRaWAN) networks. Sensors wirelessly transmit data to a LoRa gateway, which forwards the information via Wi-Fi, Ethernet or cellular networks to a central cloud server for processing, analysis and storage.
Multiple gateways can simultaneously receive the data transmitted by a LoRa node. Companies often deploy many gateways in a given area to strengthen the network’s reliability. Redundancy in the data transmission process increases the likelihood of successful delivery and minimizes the chances of data loss due to communication interruptions.
Ambient IoT is an emerging class of connected devices that harvest energy from their surroundings, including through vibrations, magnetic energy fields, light and thermal gradients. Conventional sensors can operate on a wireless power infrastructure, but they typically run on batteries. Retailers must either replace them or recharge them, which can be tedious and costly.
Generally, the investment is worth the return. However, batteries themselves introduce restrictions regarding device size, placement and lifespan. A grocery distribution center with 60 dock doors across 500,000 square feet could spend millions of dollars on a comprehensive system. It could deploy an ambient IoT system for 10 to 20 times less.
Preventing Food Recalls With IoT Sensors
Food manufacturers and distributors would greatly benefit from implementing IoT sensors in the cold chain. Cutting-edge solutions like ultra-low power ambient IoT would enable them to embed sensors virtually anywhere. Sending information to the cloud in real time could help them transform communication, driver accountability and recordkeeping.

