Anemometer Options [RE-wrenches]

[John Raynes]

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 >A slighty lower cost opotion for data logging is a sensor and logger from 
http://www.onsetcomputer.com/.
 >We have used Onset's Hobo loggers to troubleshoot Trace Gridtek-10 
inverters with great results.
 >But we have not used the weather / wind sensors.
 >Logan
 >Pine Ridge Products

The Hobo loggers are quite popular and very low cost, although you'll pay 
more to get a Hobo rated for outdoor temps (they do make them).

Also, be aware that NRG#40 or similar sensors with frequency outputs won't 
interface directly to a Hobo.  You'll need to first convert the anemometer 
frequency output to a continuous voltage level output.  NRG makes a little 
device for that purpose called a wind speed interface, but it requires its 
own 12 volt power (a very small amount), and you'll have to get well into 
the details of its output signal levels to make everything work OK.  IMO, 
probably more trouble than it's worth, 'cause the resolution and data 
storage capabilities of the Hobo aren't that great to begin with (i.e., you 
get what you pay for).   You're probably better off using an NRG#40 sensor 
with either a weather station or NRG instrument that has inputs 
specifically designed to deal with this type of signal.

If you're looking for a more generic type of logger that does deal well 
with frequency/contact closure inputs, you're probably looking at something 
like a Campbell CR510.  But at that point you've stepped up a couple levels 
in price and performance.

I stand corrected by David Blittersdorf on my speculations about the 
Maximum #400 Maestro sensor.  Sounds as if it wasn't a #40 to begin with, 
after all!


Hey Logan,  What types of sensors or inputs were you monitoring with the 
Hobo when you were troubleshooting the Gridtek units?  I'm curious.

Regards,
John Raynes
RE Solar

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