Digital Gauges: Frequently Asked Questions

The accuracy of our gauge sensors is defined at a temperature of 20°C.

For temperatures other than 20°C, the accuracy can be improved by resetting the counter once the temperature stabilizes, allowing us to consider only the temperature-dependent changes in the glass scale used in the detection part.

Our detection glass scale has a coefficient of thermal expansion of 9 × ^10⁻⁶ /K.
At a given temperature (A°C), with 20°C as the reference temperature, a 100 mm stroke sensor will have an error of 9 × ^10⁻⁶ × 100 (mm) × (A - 20) mm added to its accuracy at 20°C.
The additional error will be half of the above amount if the stroke is 50 mm, and 3/10 of the above amount if the stroke is 30 mm. This error depends on the amount of stroke, not on the resolution.

Furthermore, the change in the zero point due to temperature changes cannot be shown quantitatively because it is influenced by the mutual interactions of changes in the glass (which varies depending on the position of the detection part relative to the total length of the glass), changes in the spindle, and changes in the jig part that holds the sensor.