Top shelf on the door if for monitoring purpose, somewhere in the center of middle shelf in the freezer if for quality assurance and regulatory compliance purpose. The top shelf is usually the hottest area in a freezer. If the freezer is somehow compromised, temperature in this area rises the fast and earliest. However, temperature in this area also fluctuates the most and do not represent the typical temperature of whole freezer. If the door is frequently opened, temperatures in this area can be several degrees higher than other areas. So for temperature recording purpose, temperature sensor is recommended to be placed in the center a middle shelf inside the freezer, where temperature is most representative.

-10°C and -25°C for regular freezers, -65°C and -95°C for deep freezers, 8°C and 1°C for 4C cold rooms and coolers. And set up local delay of 5 minutes. These settings will filter out most transient temperature spikes while still catch real alarms in time. If you just start to monitor and record temperature in your freezers, you will be surprised how much temperature fluctuates, particularly if you place sensor somewhere close to the door, and set up tight thresholds, you will constantly get false alarms.

After running our system for a week or two, then you can take a look the plot of temperature log over this period, and decide what thresholds you want to set up. Particularly, you want to adjust the upper threshold according to your need and condition of each freezer. The idea is to not receive false alarms but get real alarms as early as possible.

Yes or No. The wireless coverage of base station is 20m/66ft in door. If another is not far from base station and there is not concrete walls and big metal object in between, most like you can. However, if you are not sure, you may want consider our onsite planning service or our base stations with high powered wireless radio.