Industrial temperature
data logger
A PT100 logger with two probes as standard, door, humidity and power-detection inputs, and alarms that reach a person by call, SMS or WhatsApp. It keeps the record through network drops and, on battery variants, through power cuts.
WHY WE BUILT IT
A logger is judged on the day something goes wrong
Most temperature loggers look the same on a datasheet. The difference shows on site: the probe cable that runs several metres into a reefer box, the cold room behind an insulated panel with no signal, the mains failure at 2 a.m. that is exactly the event an auditor will ask about.
This logger grew out of those situations. It was shaped by real deployments in cold storages, clinics, refrigerated trucks and hotels, and each one changed something: 3-wire probes for long cable runs, flash logging for dead zones, battery variants for rooms where wiring is the obstacle, and alarm delays so a loading door does not wake the duty manager.
The result is a device that system integrators can install with very few tools and start reporting the same day, into RIOD Live or a server you own.
WHAT MAKES IT DIFFERENT
Designed around the probe, the alarm and the outage
2-wire or 3-wire PT100
Short probe runs use 2-wire PT100. On long runs in reefer trucks and chiller installations, cable resistance would read as extra temperature, so we fit 3-wire PT100, which cancels the lead resistance.
Inputs that explain a reading
Two temperature probes as standard, with the count customised to your application. Door-contact, humidity and power-detection inputs tell you whether a rise came from a door left open, a mains failure or a struggling compressor.
Alarms with a delay you control
Thresholds and alarm delay are configurable, so a door opened for loading passes quietly and a real drift does not. Alarms go to a local buzzer and indicator light, then out by SMS, phone call, WhatsApp and email.
Calibration where the logger lives
Our calibration tool runs on the production line and at the customer's office, and calibration at the deployment site can be arranged. Accuracy is the question buyers ask most, so we treat it as part of the installation plan.
AT A GLANCE
Temperature data logger specification
- Sensor
- PT100, 2-wire or 3-wire probes
- Channels and inputs
- Two probes as standard, customisable. Optional door contact, humidity and power detection
- Range
- Down to -40 °C or -80 °C, depending on the selected configuration
- Connectivity
- 4G, Wi-Fi or BLE, with MQTT or HTTP over TLS
- Power
- 12 V adapter, or battery from about 2,000 to 5,000 mAh with USB charging where it fits. Battery variants record through power cuts
- Display and enclosure
- Seven-segment temperature display or display-less. Plastic or metal enclosure, custom nameplates
- Data and reports
- Flash logging through network drops. Audit trail on every report, PDF and Excel export, AI access through MCP
APPLICATIONS
Where the logger is applied
- Cold room temperature monitoring
- Pharmacy medicine refrigerator monitoring
- Vaccine storage and ILR monitoring
- Blood bank refrigerator monitoring
- Laboratory freezer monitoring
- Pharmaceutical warehouse monitoring
- Food and beverage cold storage monitoring
- Dairy bulk milk cooler monitoring
- Seafood and meat freezer monitoring
- Fruit ripening chamber monitoring
- Fresh produce warehouse monitoring
- Grain and seed storage temperature monitoring
- Server room temperature monitoring
- Data centre environmental monitoring
- Telecom shelter temperature monitoring
- Telecom outdoor cabinet monitoring
- Electrical panel temperature monitoring
- Transformer room ambient monitoring
- HVAC equipment room temperature monitoring
- Museum and archive storage monitoring
- Greenhouse environmental monitoring
- Animal housing temperature monitoring
- Industrial oven temperature logging
- Paint and coating curing temperature logging
- Reefer container temperature monitoring
FAQ
Questions buyers ask us
Which temperature probes does the RNDSquare data logger use?
It uses PT100 probes in 2-wire or 3-wire form. We recommend 3-wire PT100 wherever the probe sits far from the logger, such as in reefer trucks and chiller installations, because it cancels the resistance of the cable that would otherwise read as extra temperature.
Does the temperature logger keep recording during a power cut or network outage?
During a network outage the logger stores readings in flash memory and sends them when the connection returns. Battery-backed variants also keep measuring and recording through a power cut, and the power-detection input records the outage itself. For sites where power cuts matter, we specify a battery-backed variant.
How cold can an industrial PT100 data logger measure?
Our logger measures down to -40 °C or -80 °C depending on the selected configuration. That covers cold rooms, blast freezers and ultra-low temperature freezers. Tell us the lowest temperature on site and we configure the probe and logger for it.
Can the logger send temperature alarms on WhatsApp?
Yes. Each logger has configurable thresholds and an alarm delay, and alarms can go out by SMS, automated phone call, WhatsApp and email, as well as a local buzzer and indicator light. You choose who receives each alarm.
Specifying temperature loggers for a site or a fleet?
Tell us the rooms, fridges or vehicles, the lowest temperature and who needs the alarm. We will propose the probe set, connectivity and batch size.