Jump to content
Sign in to follow this  
mchan

Issues with RH5/RH5X Recorded Measurement Range

Recommended Posts

We have quite a few RH5 or RH5X at various field locations. One problem we have ran into is that the range of the recorded relative humidity will gradually change, typically the range will be 30%-95% during the 1/2 year of deployment (which matches with records from nearby weather station), then the range will become 0-100% afterwards (while the nearby weather station is still recording 30%-95% relative humidity), and eventually the RH5/RH5X will give completely invalid readings.

 

- what is the estimated service life of the RH5/RH5X?

- is RH5/RH5X supposed to be re-calibrated in the field at a certain time interval?

 

Thank you for your time and attention.

Share this post


Link to post
Share on other sites

The RH-5 sensors can be tested using the methods found here:

http://www.nrgsystems.com/TechSupport/KnowledgeBase.aspx?id=208&category=15

When the RH5 seems to go out of range compared to a nearby sensor, how does the iPack battery voltage look? The RH5/RH5X sensors require 12V excitation from the iPack battery to function properly. In instances where the battery falls due to overloading or insufficient solar gain for charging the readings may drop out.

Share this post


Link to post
Share on other sites

Only one tower of ours has recorded relative humidity and ipack voltage at the same time (other towers have sensors occupying all channels). Unfortunately, the scenario that I described in the previous post does not apply to the RH5 on that tower, so I cannot offer more clues.

 

Let's say the iPack battery has ran out of power because of cloudy sky, and thus the RH5 readings go to zero. Is the RH5 supposed to be able to function properly again once the battery is recharged and the voltage goes back to 12V?

Share this post


Link to post
Share on other sites

The iPack will stop powering the sensors (RH included) when the voltage on its battery dips below 9.2V.

Once the voltage of the iPack battery is restored above 11V, the sensors requiring the iPack's excitation voltage will power up and resume measurement. There should be no damage to the sensor if this occurs.

If you find that you have a sensor that is suspect or known to have failed, please contact support@nrgsystems.com for an RMA to return the sensor for analysis.

Share this post


Link to post
Share on other sites

Join the conversation

You are posting as a guest. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
Sign in to follow this  

×
×
  • Create New...