Interpret common measurement questions
Distinguish gravity, temperature lag and recording schedules from equipment faults.
Existing iQunet MEMS wireless sensors. Verify individual sensor specifications before applying these explanations to other devices.
Acceleration at rest
A MEMS accelerometer measures gravity even when stationary. An axis aligned with gravity can show approximately +1 g or -1 g. The documented high-pass filter removes the gravity component from vibration graphs.
Sensor temperature
The existing wireless sensor FAQ describes a temperature chip inside the enclosure. Its reading can lag changes at the mounting surface, so it is not an instantaneous surface-temperature measurement.
Wake-up and capture intervals
For the documented sleeping wireless sensors, the wake-up interval determines when the sensor contacts the base station for queued work. A shorter requested measurement interval cannot make the sensor collect its task before it wakes.
The wake-up interval is the maximum time between the documented sensor’s scheduled contacts with the base station. If no task is pending, or the base station cannot be reached, it returns to sleep. The queue interval is the requested spacing between automatic measurements; it does not override the wake-up schedule.
Can a sensor use a magnetic mount?
The original FAQ allows a magnetic base for the standard wireless vibration sensor. That answer does not apply to a magnetic-field proximity sensor: a mounting magnet would affect the quantity that sensor measures. Choose the mounting method for the sensing principle and exact product.
How were the earlier sensors used for trend monitoring?
For the earlier wireless vibration sensors, the FAQ describes choosing trend monitoring instead of annual individual recalibration. Repeated RMS, waveform and spectrum measurements from the same permanently mounted sensor help identify changes over time.
Its calibration discussion concerns those earlier wireless vibration sensors. It is not a calibration statement for every current iQunet product. When absolute measurement accuracy or a calibration certificate is required, use the specification and calibration information for the exact sensor.