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Issues with RH5/RH5X Recorded Measurement Range


mchan

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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.

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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.

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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?

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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.

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