Emma is the tracker that measures your goods. Here's what you need to know before you put it to work.
What Emma measures
Temperature: −40 to +85 °C (−40 to +185 °F), accurate to ±0.3 °C (±0.2 °C between 0 and +60 °C).
Humidity, light, movement, tilt, shocks and air pressure.
Position: GPS/GNSS, and cell-tower positioning where GPS is weak.
Emma weighs 165 g and is about the size of a hockey puck (9 cm / 3.5 in across). The housing is made from recycled ocean plastic. See Hardware Features of Emma.
Where to place Emma
Emma measures the air right around it, so where you put it matters.
Do
Place it as close to the goods as you can, for example on or between pallets.
In trucks and reefers, use one tracker per temperature zone.
In a warehouse or cold room, use several trackers at different spots and heights if you need the full picture.
Avoid
Right in front of the cooling unit, a vent or a heater.
Next to doors and loading docks.
Against outside walls or in direct sunlight.
Seeing a different temperature from the truck's own display? That's normal: the cooling unit measures the return air, Emma measures near the goods. See Why Emma's Readings Differ From the Truck's Cooling Unit and Why Do I Measure Temperature Differences in My Warehouse?.
Check that it's working
Look for a flashing LED sequence when batteries go in. That means Emma has started.
Log in to Surfact Signal and search for the serial number printed on the tracker.
Once Emma has sent data, it shows a temperature and a "last seen" time. A device is shown as offline when it hasn't sent data for 3 hours. See Device Status, Temperature Colors and Battery Levels.
Some trackers are set up with a fixed address instead of live GPS, for example in a cold room. See Fixed-Position Devices.
How Emma sends data
Emma measures at least every 15 minutes.
It sends more often when something is happening (temperature changes, movement) and less often when conditions are stable, to save battery.
Some fleets, such as delivery vans, use movement-based sending: every 15 minutes while driving, and saved readings about every 8 hours while parked.
Without mobile coverage, Emma keeps measuring, stores up to 14 days of readings and sends them as soon as it's back in coverage.
See How Your Emma Smart Tracker Collects and Sends Data, Movement-Based Sending and How Emma Sends Data During Rapid Fluctuations. Check where Emma has coverage on the Surfact Global Coverage Map.
Batteries
Emma runs on 3 AA batteries and lasts about 2 years in normal use. Cold, constant movement, big temperature swings and weak mobile signal use more power. See How to Optimize the Battery Life.
Trackers with a white Surfact "S" sticker on the side can have their batteries swapped in seconds. Use non-rechargeable lithium AA batteries. See How to Replace Batteries on Your Emma Smart Tracker.
Signal shows the battery level of every device (High, Medium or Low). Check it in The Devices View.
Calibration certificate
Every Emma comes with a calibration certificate for audits and GxP. Download it from the Certificate column in the Devices view. See Where Can I Download the Calibration Certificate?.
More about Emma
See the Emma Smart Tracker FAQ or the Emma Smart Tracking Device collection. Need more trackers or want to send one back? See How to Order More Emma Tracking Devices and Returns: Where Do I Send My Emma Smart Tracker?.