Temperature and
environmental monitoring
PT100 temperature loggers for cold rooms, clinics, IVF labs, pharma stores, poultry farms and reefer fleets. Two probes as standard, door, humidity and power inputs, alarms that reach a person by call, SMS or WhatsApp, and a log that survives network and power cuts.
THE PROBLEM
A temperature excursion is cheap to catch and expensive to discover
Some medicines have to be stored and moved at very low temperatures. A vaccine fridge, an IVF incubator room or a frozen goods chamber can lose its contents in the hours between a compressor trip and the next manual check. The loss is the stock, plus the work of proving to an auditor that everything else stayed in range.
In vehicles the cause is often human. On one reefer fleet we monitored for a chocolate maker, drivers were switching off the refrigeration unit to save fuel. Nobody saw it until product arrived soft. Once each truck reported temperature to the cloud, every switch-off had a time and a place.
HOW IT WORKS
A logger built around the probe and the alarm
PT100 probes, 2-wire or 3-wire
Short runs use 2-wire PT100. In reefer trucks and chillers the probe cable is long, and its resistance would read as extra temperature, so we fit 3-wire PT100, which cancels the lead resistance.
Two probes, plus the signals that explain a reading
Two temperature probes as standard, with more on request. Door, humidity and power-detection inputs tell you whether a rise came from an open door, a mains failure or a failing compressor.
Alarms with a delay you set
Set the threshold and the delay per channel, so a door opened for loading does not wake anyone, but a real drift does. Local buzzer and light, then SMS, phone call, WhatsApp and email.
The record survives the outage
Readings go to flash memory when the network is down and are sent once it returns. Battery versions keep recording through a power cut, which is exactly when you need the data.
Calibration on the line or at your office
Our calibration tool works in production and at the customer site, so probes can be checked where the devices live rather than shipped back.
From cold rooms to ultra-low freezers
The measuring range goes down to -40 °C or -80 °C depending on configuration. Versions with a seven-segment display for staff on the floor, or without one where nobody needs to read it locally.
FROM THE FIELD
Sites where this is running
Reefer trucks, chocolate maker
Sensors on each truck, cloud reporting and an API into the customer system. The data showed exactly when refrigeration units were switched off on the road.
Clinics
Temperature monitoring on medicine and sample storage, with alarms that go to the people on duty and reports ready for inspection.
Cold storage with DG backup
Chamber temperatures monitored alongside the diesel generator, so the operator could see whether the backup power actually held the rooms during a mains failure.
Where wiring was the obstacle
In controlled rooms and cold stores, running new cable is disruptive. Battery-powered wireless loggers let us instrument these spaces without opening walls or insulated panels.
SPECIFICATION
Temperature logger at a glance
- Sensor
- PT100, 2-wire or 3-wire
- Channels
- Two temperature probes as standard, customisable
- Extra inputs
- Door contact, humidity, power detection
- Range
- Down to -40 °C or -80 °C, depending on configuration
- Alarms
- Threshold and delay per channel. Buzzer, light, SMS, call, WhatsApp, email
- Connectivity
- 4G, Wi-Fi or BLE
- Protocol and security
- MQTT or HTTP over TLS
- Data during outages
- Stored in flash and sent when the link returns. Battery variants record through power cuts
- Display
- Seven-segment display or display-less
- Power
- 12 V adapter, or battery from about 2,000 to 5,000 mAh
- Reports
- Audit trail, PDF and Excel export
WHERE IT IS USED
Sectors that rely on it
- Clinics and medicine refrigerators
- IVF facilities
- Pharmaceutical stores and warehouses
- Medicine transport at very low temperatures
- Cold storage chambers and freezers
- Reefer trucks and cold chain logistics
- Poultry farms
- Hotel kitchens and cold rooms
- Food and beverage storage
FAQ
Questions buyers ask us
Why does 3-wire PT100 matter?
In a 2-wire PT100 the resistance of the cable adds to the reading, so a long cable makes the room look warmer than it is. A 3-wire connection measures and cancels that lead resistance. We use it wherever the probe sits far from the logger, such as reefer trucks and chillers.
What happens if the network goes down?
The logger keeps reading and stores the data in flash memory, then sends the backlog once the connection returns. Battery versions also keep recording through a power cut.
Who gets the alarm, and how?
You decide. Each channel has its own threshold and delay. Alarms can sound a local buzzer and light and go out by SMS, automated phone call, WhatsApp and email to the people you name.
How cold can it measure?
Down to -40 °C or -80 °C depending on the configuration, which covers cold rooms, freezers and ultra-low temperature storage.
Can it fit our existing reporting system?
Yes. The logger talks MQTT or HTTP over TLS, and the device logic can be customised. Data can go to RIOD Live, to your own server or into your system through an API.
Planning a temperature monitoring rollout?
Tell us the rooms, fridges or vehicles, the temperature range and who needs the alarm. We will propose the probe set, the connectivity and the batch size.