Cold Room Temperature Monitoring for Food Stores
Remote Temperature and Humidity Monitoring for Freezers and Coolers
The SensMax SensGuard remote temperature and humidity monitoring system provides full visibility and control of storage conditions in freezers, coolers, cold rooms and warm displays. Stable temperature ensures food quality, reduces spoilage and helps maintain compliance with HACCP and local food safety regulations. The system works in real time and immediately alerts responsible staff when temperature values go outside the allowed range.
What this solution does
SensMax offers a remote temperature and humidity monitoring system that gives a complete picture of conditions inside refrigerators, freezers and cold rooms. Keeping an optimal temperature in coolers and freezers allows you to offer fresh food to customers. If the temperature rises above or drops below the optimal range, food spoilage may occur, causing product loss, non-compliance with regulations and additional expenses for repairs or product write-off. With SensGuard, you get an immediate notification when a temperature sensor detects that the refrigerator temperature has gone outside the allowed range, giving you time to react.
Where you can use it
- Supermarkets and hypermarkets – monitoring all freezers, coolers, upright fridges and open showcases in fresh food departments.
- Convenience stores and fuel stations – tracking beverage fridges and small freezers with limited staff on site.
- Butcher, fish and deli counters – continuous monitoring of temperature-sensitive products in service counters and back-room fridges.
- Back-of-store cold rooms and storage areas – controlling temperature in places not visible to customers.
- Bakery and warm displays – monitoring elevated temperatures where stable conditions are also important.
Installation examples of wireless temperature and humidity sensors in freezers, coolers and cold rooms.
How the SensGuard system works
The remote temperature and humidity monitoring system works in real time and detects problems at an early stage. You can set up min/max parameters of the temperature and humidity range for each wireless remote monitoring sensor, as well as configure a defrost algorithm for refrigerators to filter out short-term temperature rises during automatic defrost cycles.
SensGuard online temperature and humidity monitoring system architecture for food retail.
The SensGuard solution consists of three main components:
- Wireless temperature and humidity sensors that read values inside each freezer or cooler every 5 minutes.
- SensMax TCP LR X2 data gateway that collects readings from nearby sensors and sends them to the cloud.
- SensGuard cloud software that visualises data, shows alarms and generates reports.
Wireless monitoring sensors are battery-powered devices that can work for up to 5 years. The data gateway collects information from up to 250 wireless monitoring sensors within a range of up to 150 m and has a short-term backup memory that prevents data loss in case of Internet connectivity failures.
Hardware used in this solution
You can choose different types of wireless temperature sensors according to your project specifics. There are waterproof monitoring sensors with a built-in battery for standard temperature ranges, and probe-type sensors for deep freezers and high-temperature equipment.
| Device | Type | Temperature range | Accuracy | Resolution | Battery / Power | Typical use |
|---|---|---|---|---|---|---|
| MCP9800 wireless temperature sensor | Waterproof sensor | −20°C…+55°C | ±0.5°C | 0.1°C | up to 5 years | Standard freezers, coolers and upright fridges. |
| ENS210 wireless temperature & humidity sensor | Temperature & humidity sensor | −20°C…+55°C / 0–100% RH | ±0.5°C / ±3.5% RH | 0.1°C | up to 5 years | Cold rooms and storage areas where both temperature and humidity affect product quality. |
| DS18B20 probe-type wireless temperature sensor | Probe sensor | −30°C…+120°C | ±0.5°C | 0.1°C | up to 5 years | Deep freezers, blast freezers, inside-product or liquid temperature measurement. |
| PT100 probe-type high-range wireless temperature sensor | High-range probe sensor | −50°C…+200°C | ±0.2°C | 0.1°C | up to 5 years | Baking equipment, elevated-temperature displays and extreme low-temperature applications. |
Defrost handling and temperature filtering
In refrigeration systems with automatic defrost cycles, the temperature may briefly rise above the allowed limit. SensGuard allows configuring a defrost algorithm that filters out such short-term temperature rises caused by defrosting. There is also the option to use the DigitalFilter function to calculate the real product temperature in a freezer and avoid alarms caused by short-term temperature violations when a customer opens the fridge door.
The Digital Filter function filters out the short-term temperature peaks.
Reporting and compliance
The SensGuard monitoring system provides low-cost temperature and humidity sensors, real-time data processing, min/max parameters control, defrost settings, flexible notifications, sensor-on-map view, DigitalFilter function, event history, data export and a multi-user environment. Together, these features make it an efficient tool for cold chain monitoring and HACCP temperature monitoring in food retail.
SensGuard cloud software
The SensGuard online portal displays statistical information for each temperature and humidity sensor or sensor group. You can:
- set allowed min/max temperature and humidity ranges and receive notifications if any parameter goes outside them;
- upload a store map and place sensors on it to quickly identify which freezer or cooler has a problem;
- configure individual e-mail or notification via Telegram messenger for each system user according to their role in the company;
- review alarm history, comments and duration of incidents;
- analyse trends to detect early signs of equipment issues or door-usage patterns.
The system supports data export as CSV files and PDF reports, which allows you to archive temperature history and use reports during inspections or internal audits.
Store map view with sensors placed on freezers and showcases to quickly locate problem areas.
Monitoring list of refrigeration objects with current temperature readings and status indicators.
Detailed sensor readings with notification history for incident analysis.
Notification diagram showing long-term temperature stability and alarm periods.
