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Thank you for your question. There are two methods of monitoring pressure and weight using RFMicron sensors. Method #1 uses one of our moisture sensors and has a piece of metal move closer to the sensor as the pressure increases. The highly accurate pressure sensors use this approach. The downside of this approach is that the cost of the metal apparatus goes up with improving accuracy. Method #2 also uses a moisture sensor and has a piece of closed-cell foam with a small piece of metal foil over the moisture sensor area. As the pressure or weight increases, the foil is pressed closer to the sensor. The sensor detects the change and reports the value. This type of weight sensor provides a reasonable estimate of the object’s weight.
The newest RFMicron IC supports external sensing elements, like load cells, strain gauges, etc. This might be your best option for weight and pressure measurements. We will have full sensors later in 2017 that allow you to add your own sensing circuitry.
Thank you for your question. Cold chain shipment monitoring is definitely difficult for an all-passive sensor. One option is to add a reader to the vehicle or shipping container. The reader can power and communicate with the sensors to record the temperature during transport.
In many cases, we’re finding that the temperature violations are happening during unloading periods. A handheld reader or a reader located on the loading dock can monitor critical goods and the temperatures in these situations. RFMicron can support this type of monitoring today.
For actual data logging only on the sensor itself when away from any readers, RFMicron can not offer that capability until we release a semi-passive sensor.