Dear all

We have a DT800 since many years and we use it a few times for temperature measurings
Now, i have a new chalenge to build a weather station with some sensores the we have in the lab

The sensors are:

SP Lite2 Pyranometer; sensitivity 68 uV/W.m-2
Thies anemometer 0.5-40m/s, a T351-TR Thermistor, a very old pluviometer that I will calibrate it.
And some k thermocouples for surface temp.
I will need to buy a humidity sensor (suggestions are well come)

I had worked with DT800 some years ago with DLogger.
I tested a few days and evrything works fine.

My message in forum is because I do not understand nothing about wetaher stations.

The requirements: "max-min and cumulative temp; max and cumulative solar radiation; number of hours of sunlight per day; humidity; max min precipitation, wind speed"

I read here that some people has donne it very weel.

I will appreciate that I some one can help me configure it throught DLogger.

For starting I am now working with the pyranometer I configure it to read voltage and after conecting, I get some reading in mV and it changes values with or without sun light, next step how to configure it to get units?

best
cpalha

Dear All

Yesterday I configured the pyranometer channel as a voltage and it measures about 30 mVolts inside the room
Outside in sunlight is gives about 100mV
After that I configure another channel as CV with a formula from pyranometer channel. The formula is in the datasheet
Esolar (W/m2)=Uemf(uV)/S(uV/W/m2)

Seems it works fine I need to multiply mV*1000 to get uV

About the temperature sensor, thermistor T351-TR from Vector, 2Kohms at 25ºC, the DLogger has no possibility to configure it as 2000 ohms, but near with YS04 I get near temp values.

Now is the wind speed sensor, small wind transmitter, 1 pulse/revolution.
Can someone tell me what type config I need to config it in DLogger? I try with counter, but no values. Frequency does not work too. As analog input it changes between 0 and 1. How can I add a formula to change it for m/s?

Best regards
Cpalha

Dear all

I am sorry for insist but I need help how to config a wind speed (1 pulse/rev)
I config it as a counter and it count pulses, but how to convert to speed m/s
I know that the wind speed has the 0.8m/rev as constant.

Best regards
Carlos

Hi cpalha,

We apologize for the late response.

Let us start to solve the pyranometer, as you can get the reading you should be able to set up the scaling. In DeLogger at the bottom of your configuration screen, you will see the schedules tab.

At the end of the schedule tab, you will find the scaling. Please set the scaling to linear and provide the numbers, physical means the output (W/M2), and the signal means the voltage output from the sensor (mV or uV).

As the sensor does not provide you with a clear voltage output range but only the sensitivity, you will need to calculate the maximum voltage output based on the sensor's maximum reading range. Example 68 uV/W/m2 with a maximum of 2000 W/m2, meaning the voltage output would be 0 mV - 136 mV.

You can use that range for your scaling. Or there is a second option in which you divide the reading with 68 uV (or 0.068 mV) to get the W/m2 reading. Remember division means multiplication in another way, which basically you can multiply the reading with 14.7 (1/0.068). Please use a polynomial and set 14.7 on the second column (the label is incorrect) and leave the other column with 0.

Next is the wind speed, you need to read the output pulses from the sensor. You need to read it as a counter, then enable some option to get the frequency. The first option would be the "reset", click the wiring's triple dots and enable the option. The second option would be data manipulation "Reading/ time difference (RS), this will allow getting the reading per second (frequency).

After getting the frequency you can enable another scaling to convert it to m/s.

Best regards,
dataTaker Expert