5th generation devices will be available soon.

The most important innovation is that Mid Devices are no longer necessary. The control computers become a direct part of the AE network. The web app communicates with the sensors via Bluetooth LE. In addition, the sensors can now also carry out measurements independently. A computer on the AE network is only required for settings and display of results. For example, this option significantly reduces power consumption for long-term measurements.

4th generation sensors are obsolete. They are only sold for the expansion of existing measuring systems.

The ISM sensors are manufactured with both Li-Ion and LiFePo4 cells. The height of the sensor is determined by the capacity of the cells. Due to the cell chemistry, LiFePO4 cells are considered intrinsically safe. Thermal runaway and membrane melting, as with other lithium-ion batteries, are excluded. They are less prone to explosion and allow more charging cycles. They can also be used in a temperature range from -10°C to 60°C. Li-ion cells only work between 0°C and 50°C. But they have about twice the capacity with the same volume. The cells are charged via a 3A USB-C charging cable. This enables the measurement times to be extended with a standard power bank.

The data exchange takes place in the 2.4 GHz ISM band. Bluetooth Low Energy is used as the protocol if no Mid Device is available. A proprietary protocol is applied with Mid Device, which increases data throughput and improves synchronization in the sub-microsecond range.

The ANALOG module connected downstream of the piezo amplifies and filters the signal, forms the logarithmic envelope for data reduction and monitors the exceeding of the threshold value. Since it is constantly in operation during the measurement and consumes 53mW, it essentially determines the possible measurement times. The digital signal processing unit PARAM, which takes over the event control and the AE parameter formation, requires only little energy with 7mW. The second largest consumer with 28mW is the transmitter part TX, which is mainly active when measurement data is being transmitted. The achievable operating times therefore also depend on the hit rates.

The maximum power consumption is 91mW. If the threshold is not exceeded, only 55mW are consumed.