Ultrasound sensor calibration

Hello,

I am currently setting up vibration/ultrasonic sensors
(https://store.ncd.io/product/industrial-iot-wireless-ultrasound-vibration-temperature-sensor-gen4/)

Most of the sensors are working fine. However, two sensors are showing abnormal readings. Based on an average of 10 readings, one of the sensors recorded an average vibration of 4 mm/s, while the other recorded an average vibration of 3.4 mm/s. The calibrated reference sensor, meanwhile, recorded 1.1 mm/s.

When at rest, one of the sensors recorded 2.9 mm/s and the other 3.1 mm/s.

The sensors were configured correctly. As proof, all the other sensors share the same settings and provide correct readings.

I tried a factory reset and then reconfigured them, but still got the same incorrect result.

Is there a way to calibrate this type of sensor (other than ODR, sampling duration, and filters)?

Thanks

Please can you share a few node red example packets.