NO2 probe 9238-Pb

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mrlenoble
Posts: 5
Joined: Fri May 06, 2016 11:23 am

NO2 probe 9238-Pb

Post by mrlenoble » Thu Jul 21, 2016 3:40 pm

Hello support,

We have a WaspMote Plug&Sense Smart Environment with LoraWan, connected sensors are:
Temperature
NO2
Air Pressure

I have some questions about the NO2 sensorprobe 9238-Pb:
1. Which sensor is used in the 9238-Pb? I can not find it in de documentation.
2. In the examples the gain is set to 1 and the load resistor is set to 3, in the documentation of "Gases calibration.pdf" the recommended load resistor = 20. Which one should I use?

Kind Regards,

Marcel

libelium-dev
Posts: 27967
Joined: Mon Sep 28, 2009 1:06 pm

Re: NO2 probe 9238-Pb

Post by libelium-dev » Fri Jul 22, 2016 1:07 pm

Hi,

The sensor is the MICS-2714, you have more detailed information of this sensor at the guide at page 33,
http://www.libelium.com/downloads/docum ... rd_2.0.pdf

About the gain it depends of the concentration you are going to measure, changing the gain you will avoid the sensor get saturated.

Regards

mrlenoble
Posts: 5
Joined: Fri May 06, 2016 11:23 am

Re: NO2 probe 9238-Pb

Post by mrlenoble » Fri Jul 22, 2016 1:48 pm

What about the load resistor ?

libelium-dev
Posts: 27967
Joined: Mon Sep 28, 2009 1:06 pm

Re: NO2 probe 9238-Pb

Post by libelium-dev » Mon Jul 25, 2016 8:26 am

The load resistor also depends of the concentration, the typical value is 20KOhm up to 100K.

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