Sensor shows too high values

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Message 1212 - Posted: 15 Jul 2012 | 10:01:34 UTC
Last modified: 15 Jul 2012 | 10:02:05 UTC

Hello everybody!

I have since the end of March 2012, a sensor in operation. At my place there is an official measuring station at which I can compare the measurements. Since the beginning, the sensor shows too high values.

According to my observations, the deviation is between +0.028 and +0.035 µS/h (average: 0,032 µS/h). The high values ​​of the sensor is almost always above the limit for my region (= 0.120 µS/h). Changes in the values ​​up or down are almost identical (say 95%) with the official measuring station.

If you want to have a look, follow the links:
My private station:
Official station:

I tested the sensor already at various locations, all of them were in the house. Result: no improvement.

As a last try I will hang the sensor out of the window.

Does anyone have any idea what I can try next?
Is there somewhere a way to enter a correction factor?

Am grateful for any help
(Translated with Google)

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Message 1216 - Posted: 16 Jul 2012 | 16:12:38 UTC - in response to Message 1212.
Last modified: 16 Jul 2012 | 16:18:20 UTC

It could be because the sensor tube is unshielded so it's slightly sensitive to weaker radiation.
At the place where I live the shielded SBM-20-1 reads 0.115 avg (7 days sample) while unshielded SBM-20 averages around 0.126, sometimes even 0.127.

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