Wired Temperature Monitoring for Multi-Compartment Refrigerated Trucks

Bluetooth pucks are the easy way to monitor a load: no wiring, ten-year battery, drop it in the tote. They sample on an interval, they depend on a radio link, and they are not calibrated instruments. For most food and beverage distribution that is fine. For a multi-compartment truck under a contract or a regulation that specifies continuous, calibrated monitoring per compartment — pharmaceuticals, certain meat and seafood programs, hospital and laboratory logistics — the wired option is the one the auditor expects, and wired temperature monitoring is that option.

Industrial-grade temperature probes, one per compartment, wired to a controller that connects to the GO device through the IOX port. The probes are calibrated, the sampling is continuous, and the readings go to MyGeotab with the vehicle's position and time as individual data streams per compartment. Alerts fire when a compartment leaves its band, with escalation to the driver's device and the dispatcher; the per-trip log is the delivery record, and it survives out-of-coverage stretches because the controller buffers.

Customer proof-of-condition at delivery, with the compartment's temperature at the moment the geofence was entered. Rejected-load disputes, where the fleet's continuous record against the customer's dock thermometer settles who cooled what. HACCP and pharmaceutical good-distribution-practice documentation, where a calibrated, continuous, tamper-evident record per compartment is the requirement. Reefer performance, where a compartment that struggles to hold setpoint on hot afternoons shows up before the load is lost.

Most fleets end up with both: pucks in the totes and vans, wired monitors on the multi-compartment trucks under audit. The table shows where each one fits.

Probes are run into each compartment and the controller is mounted and connected to the GO device by an installer; calibration certificates are kept with the vehicle record. High Point GPS installs the wired system and builds the compartment reports and alerts for cold-chain carriers in Quebec, Ontario and the northeastern US.