Cold room and cold storage temperature monitoring
A cold room is not one temperature. It is warmer by the door, colder by the evaporator, and in the far corner is where the thing nobody sees happens. The system places several sensors in the room on a single cable, reports over cellular from a controller that stays outside, and alerts the moment one point leaves its range.
A cold room is not one temperature
One thermometer by the door tells half the story. Several sensors on one cable tell all of it.
The door was left open
A truck being unloaded, a forklift stuck in the doorway, someone who forgot. The sensor by the door shows the rise first, and the allowed excursion duration you set separates a normal fifteen-minute unloading from a door left open for an hour.
An evaporator icing up
The temperature does not jump, it creeps. The room's history shows a slow rise over days before the first alert arrives, and that is the moment to book a defrost or a technician, not after the stock is thrown out.
A warehouse with several rooms
temperature and humidity sensors are addressable on an RS-485 bus up to 2,000 m long, so one controller outside the rooms covers several rooms and several points in each. Every sensor gets its own name, range and history on the dashboard.
A record per room
Every reading is stored with a timestamp. Before an inspection, or before a dispute with a customer over a delivery that arrived warm, you export the room's history for the requested period to Excel.
What gets installed, and where
Sensors inside, controller outside, one cable between them.
- 01
Sensors inside the room
A temperature and humidity sensor in a sealed or IP67 housing, one by the door and one in the far corner, on the same RS-485 cable. For a freezer room or a point inside product, a stainless IP68 temperature probe that measures down to -55°C.
- 02
Controller outside the room
The Omni Genesis controller hangs on the outer wall, at normal temperature, and takes the sensor cable through a pass-through in the panel. It reports over Wi-Fi or 4G-LTE with a SIM included in the subscription, runs on a rechargeable battery and connects to a power adapter where a socket exists.
- 03
A range and an excursion duration per point
On the dashboard each sensor gets a name, a minimum, a maximum and an allowed excursion duration. Meat room between 0 and 2°C, vegetable room between 4 and 8, freezer room below -18. The reporting interval is set per controller, from one minute up.
- 04
Alert and history
An excursion that outlasts the allowed duration sends an alert by SMS, email, phone call or push notification to every user on the account. The history of each point is stored in the cloud and exports to Excel.
For individual refrigerators and freezers in a kitchen or shop, see the refrigerator and freezer temperature monitoring system.
Wireless temperature monitoring for a cold store with metal walls
An insulated panel faced with metal on both sides is a small Faraday cage. A wireless transmitter placed inside a cold room loses its signal the moment the door closes, and many systems solve that by mounting the transmitter next to the door, which is the least representative point in the room. Here the wireless part is the controller outside, and the part inside is wired.
The controller reports over the cellular network with a SIM included in the cloud subscription and runs on a rechargeable battery. A warehouse with no Wi-Fi, a warehouse with power cuts or a rented warehouse where the network is off limits are all monitored the same way.
Types of room
Same installation, different ranges.
Cold storage and distribution
Several rooms at different temperatures on one controller. A history per room when a customer claims a delivery arrived warm.
Freezer rooms
A temperature probe down to -55°C. An allowed excursion duration that covers a scheduled defrost without missing a stopped compressor.
Packing houses and pre-cooling
Pre-cooling of produce after harvest, where the time to target temperature decides shelf life. Temperature and humidity together.
Ripening rooms
Bananas, avocados and mangoes, where relative humidity matters as much as temperature. The temperature and humidity sensor measures both at the same point.
Technical specifications
| Temperature and humidity sensor, temperature | -40 to +80°C, ±0.3°C @ 25°C |
| Temperature and humidity sensor, humidity | 0-100% RH, ±3% RH |
| Temperature and humidity sensor, housings | Vented, sealed, stainless, sintered, IP67 |
| Sensor bus | RS-485 Modbus RTU, up to 2,000 m |
| Temperature probe | -55 to +125°C, ±0.5°C, IP68 |
| Controller | Omni Genesis, 4 ports, rechargeable battery, 6-32V DC input |
| Connectivity | Wi-Fi / 4G-LTE (SIM included), Bluetooth |
| Reporting interval | Your choice, from one minute up |
| Export | Excel, per sensor and per period |
| Warranty | 24 months on the controller, 12 months on sensors |
Questions about cold room temperature monitoring
How many measurement points does one cold room need?
How does the cable get into the room?
Does the warehouse need Wi-Fi?
What happens in a power outage?
Can humidity be monitored as well?
Tell us about your cold store
How many rooms, at which temperatures, and where the controller can sit. We will scope the measurement points with you.
Send a message insteadThe far corner of the room, on your screen
Several measurement points per room, an alert on excursion, and a history that is ready for inspection.
Technical capabilities
The facts an integration plan needs. Full measurement range and accuracy specifications are on every product page and datasheet.
Sensor protocols
- RS-485 Modbus RTU
- SDI-12
- I2C
- Analog
- 1-Wire
Connectivity
- 4G LTE cellular (optional)
- Wi-Fi
- Bluetooth
Power and enclosure
- Solar powered
- Battery operated, deep-sleep cycle
- IP65 rated controllers
Data and integration
- Cloud dashboard with real-time alerts
- Configurable reporting intervals
- REST API access