Sensor calibration using the Dosed-Reference-Method CTH | Industrial controlsCTH

Sensor calibration using the Dosed-Reference-Method

The measurement result of the sensor is only as good
as the reference to which it has been calibrated.”

For this reason we have developed the dosed-reference-method
as an alternative to isokinetic dust sampling.
The main basic idea of this is that a mass flow is dosed into the system
which corresponds to a required concentration at a specific flow velocity.

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“Right up to today, isokinetic dust sampling has been the acknowledged method in the industry for calibrating continuous dust measuring sensors.”

As a specialist measuring equipment manufacturer, we must be able to calibrate our sensors with extreme precision.

In previous calibrations using isokinetic dust sampling, we have found that this method has certain inadequacies in terms of the accuracy of the reference. One problem of isokinetic is that it cannot be used to specify the target, fixed calibration points and instead, the dust concentrations which prevail at the time of the calibration and are generally very low must be used as calibration points.
These points are generally well away from the limit values or switching points which must be calibrated.

Furthermore, isokinetic requires a long measuring time
for such low dust concentrations to provide any useful results at all.
Furthermore, external climatic conditions (temperature and humidity) have a major influence on the measurement result.