Dametric

The AGS (Adjustable Gap Sensor) sensor represents a further development of the TDC sensor. Whereas the TDC sensor involves the sensor being statically embedded in the refiner's stator segment, the tip of the AGS can now be moved. Therefore, it is possible to frequently calibrate during production to improve the reliability and the accuracy of the calibration process, reducing the downtime on the refiner and lowering the overall production costs.

The AGS sensor is an integrated unit including the TDC measuring tip with a temperature sensor, a high frequency vibration transducer and a stepping motor designed to control the movement of the tip. Furthermore, it is very user friendly and does not require specifically trained personnel to operate the system. The monitor system for the AGS sensor includes a Panel PC controlling the calibration procedure and continually informing the operator of the calibration steps. The calibration values will not be effective unless the operator approves the calibration result. The AGS can be used for all types of refiners that currently operate the TDC sensors, with the only exception of the Double Disc refiners. The front of the AGS is identical to the standard TDC sensor.

The AGS sensor is used together with an RMS or a GMS measuring system.

The AGS measuring tips can be purchased either from Metso Paper or from Dametric.

What is the difference between the TDC and AGS sensors?

The accuracy of the TDC sensor is determined by its calibration, with every calibration needing to be performed in precisely the same way. In the case of the AGS, calibration is performed automatically by moving the tip of the sensor towards the rotor segment, instead of moving the rotor towards the stator, which is the case when using the TDC sensor. It should be noted that calibration is possible during production with the AGS sensor. The calibration can be performed with minimal risk of segment damage because the rotor and the stator are no longer moved towards one another during calibration.

Exchange of tips

After a certain period of time, the tip will wear out and need to be replaced. The tip is designed to last for the life span of the grinding plates. A new tip will match a new plate mechanically so that the tip will be fresh with the plates at installation. The system has a built-in user friendly procedure for replacing tips.

Documentation

AGS.pdf