GPS Tracking with Temperature Sensors for Reefer Trailers
Protect temperature-sensitive cargo on every route
A GPS tracker with a temperature sensor records where a reefer trailer is and how cold the cargo is, minute by minute. Top Tracking System puts that on one dashboard with your GPS fleet tracking and ELD, sends an alert the moment temperature drifts out of range, and keeps the trip log you need for FSMA and a rejected-load claim.
What Top Tracking System temperature sensors do
Live location
Every reefer on one map in real time, so dispatch can reroute around delays and give receivers accurate ETAs.
Continuous temperature logging
A wireless probe reads the trailer air or return-air temperature every few minutes and stores it, so you have a full record, not spot checks.
Out-of-range alerts
Set a high and low limit per load and get a text the moment the trailer drifts past it, while there is still time to fix the reefer.
Geofencing alerts
Draw a zone around a DC, cross-dock, or customer and get an alert when a trailer arrives or leaves, day or night.
Trip and temperature history
Replay any run with location and temperature side by side, including door-open events, to show a receiver the load stayed in spec.
Speed alerts
Get flagged when a truck exceeds a set limit or the posted road speed, data a CSA review and a crash lawyer both check.
Maintenance reminders
Schedule tractor and reefer-unit service by engine hours or odometer, so a PM is never missed.
How temperature monitoring works, in 3 steps
Mount the GPS, place the probes, then watch temperature and location from the same dashboard.
- 01
Install the sensors
The GPS unit mounts on the tractor and wireless probes go in the trailer, one per zone for multi-temp loads.
- 02
Data transmission
Location and temperature readings go to the cloud over cellular, and store on the device through any dead zone.
- 03
Fleet monitoring
The dashboard shows live temperature and location per trailer, sends out-of-range and door-open alerts, and exports the trip temperature report for a shipper or a claim.
Why fleets choose Top Tracking System for cold chain monitoring
We are a small US-based company built around trucking technology. The difference shows up in 3 places: the support you reach, the contract you sign, and the number of vendors you manage.
Focused on trucking since 2016. Temperature and fuel sensors, GPS, ELD, and cameras are all we build.
One platform, one bill. Temperature sensors, GPS, ELD, and cameras run on the same dashboard, not 3 or 4 logins.
Support you can reach. Phone, email, and WhatsApp from a US-based team, on a month-to-month plan.
Temperature sensor questions carriers ask before they buy
Straight answers on reefer control vs monitoring, probe placement, rejected loads, FSMA, and adding sensors to trailers you already track.
1. Does the sensor control the reefer or just watch it?
It monitors, it does not control. The sensor logs the actual trailer temperature and alerts when it drifts out of range, but it does not change the reefer set point. You get an early warning to act before the load is lost, plus a record of what the trailer actually held.
2. Is this the same as the reefer unit's own temperature readout?
No. The reefer microprocessor logs its own data, but you only see it once the trailer is back and someone downloads it. This sensor sends the trailer temperature to your phone in real time and keeps an independent record a shipper cannot wave off as "the unit was fine."
3. Where does the probe go, and does one cover the whole trailer?
One probe usually sits in the return air near the front bulkhead. For a long trailer or a multi-temp load you add a probe per zone, plus pulp-temp probes for spot checks at the dock. We set the placement to what you haul.
4. Will these records hold up if a receiver rejects a load?
A continuous, time-stamped temperature log with location is the evidence carriers use to fight a rejection or a claim. It shows the load stayed in spec through the trip, or pinpoints when and where it did not, which also helps you recover from the party at fault.
5. Does it help with FSMA compliance?
It covers the record-keeping side. Under the FSMA Sanitary Transport rule the carrier must maintain the temperature the shipper specifies and show records on request. Continuous logging gives you those records without a clipboard; written agreements and training are still on you.
6. Can I add temperature sensors to trailers I already track?
Usually yes. If the trailer has a Top Tracking System GPS unit, a wireless probe pairs to it. If it is on another provider's tracker, you may need our trailer unit. Send us the trailer list and we will tell you what each one needs.
Ready to protect every reefer load?
Talk with our team about temperature probes, GPS trailer units, and the trip logs shippers ask for.