PWS – Calibrations: UT330C

For amateur meteorologists it is not always easy to calibrate their equipment, unless you yourself are working at a meteorological service or know people who do, it can be difficult to get the readouts correct within the limits of error of the weather station. I described this already a short time ago.

The UT330C

So now I have this new UT330C. I bought it in China and it arrived pretty fast (11 days). It measures temperature, humidity and pressure within reasonable error limits:


Accurate device used as calibration tool for the weather station

Technical data:
Temperature measurement range: -40°C to +80°C
Humidity measurement range: 0%RH to 100%RH
Air pressure measurement range: 750 hPa to 1100 hPa
Basic accuracy: ±0.5°C, ±3.0%RH, ±3 hPa
Measurement interval: 1 s to 6 h
Storage capacity: 60,000 records
Voltage supply: Lithium battery 3.6 V, 1/2 AA

It comes calibrated from the factory and my first tests showed that  recalibration was not necessary. After one day taking measurements and comparing those with the weather station I noticed my weather station humidity calibration was very wrong. The new values are:

Current calibration values
Pressure : +2 hPa
Temperature +1 °C
Humidity -6 %


The software

The UT330 comes with a short manual and software and those offer some difficulty. The manual is an extremely badly translated text – from Chinese by a Chinese I suppose – and it sometimes is difficult to understand what they are actually trying to say. I am handy with this type of equipment so it did not pose to many real problems but if you are not familiar with something like this you better think twice.

It gets even worse with the software. As far as I could find out the software dates from before 2012. This means it pre-dates Windows 10. After installation and running it several times, my computer started to behave badly. My FWIcalc program started failing, the setup disappeared and an ftp-upload, unsolicited became accompanied by some unknown software. Apparently it has been made for another OS (likely Win 8) but no information can be found anywhere on the net. I only found the same executable everywhere in many different places.

Finally I had to restore my computer to a previous system recovery point. And when I had it restored, I could run normally but had lost some Windows apps e.g. Photos. I am not happy with that.

In general: the hardware is fine but the software poses a real threat to modern Windows machines. Take care!

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