Replacement Parts

Replacement Parts can be purchased from here

User Manuals and Application Notes

Current RG-11 User Manual
RS232 Communications – This feature is used for Hydreon testing and development, and included ‘as is’.
Protocol details for Software Rev 012.  Download as a text file.  (Right click, save link as or save target as.) 

Firmware Updates

You can tell Firmware revision from the sticker on the connector block.

012- December 15, 2011-
– Corrections to numerics of metric tipping bucket mode.
– Reassignment of switches for wiper control applications.

011 – Units from October 14- December 15, 2011 onwards have this firmware revision. 
– More accurate in tipping bucket applications.
– In irrigation control, thresholds for inhibit during storm were made more sensitive.  Also, in irrigation mode, Switch 8 on means high transpiration rate.
– This SW and later assume the lens is treated with hydrophobic coating.  (Rain-X). 

006 – Units sold from November 8, 2010 to October 13, have this firmware.  If these units are being used in rainfall measurement (tipping bucket) applications, they will be more accurate if they are reprogrammed to current firmware.  We will generally do this at no charge.  Contact us.

Built in Heater

A built-in low power (0.25W) heater extends the operation of the device to freezing (32 F or 0 C). Note that this is a very modest amount of power; it will tend to drive off a modest amount of frost, but will not melt ice.

Safety Policy

The Rain Gauge is a well tested, very high quality product. That said, understand these guidelines before designing the Rain Gauge into any system:

It is the responsibility of the systems integrator and purchaser of the Rain Gauge to insure a safe installation. Any mechanical system, including one that incorporates a Rain Gauge, requires appropriate safety interlocks. Hydreon Corporation warrants only the actual cost of the sensor, and only that it is free from defects in workmanship.

The Rain Gauge is warranted to be free from defects for a period of one year from date of purchase. Under no circumstances will Hydreon be liable for any consequential damages due to failure or any other mishap involving a Rain Gauge. Hydreon’s liability in the event of a failure, or inability to sense a condition, is limited to the actual cost of the particular sensor. Explicitly, if other objects are destroyed due to water damage, or if any object is destroyed because of a false indication of water, Hydreon Corporation is in no way, whatsoever, liable for anything other than the cost of the Rain Gauge, and then only if the Rain Gauge is shown to have some defect in materials or workmanship. Limitations and imperfections of the Rain Gauge do not constitute a defect. Further, if some valuable data is not gathered because an erroneous indication of any sort due to the Rain Gauge, Hydreon Corporation is liable only for the cost of the Rain Gauge.

It is the responsibility of the system designer and purchasers of the Rain Gauge to insure that a failure of the Rain Gauge will not cause consequential damages. If a failure in Rain Gauge would cause disaster, we recommend against deployment of the Rain Gauge, or against the system in which the Rain Gauge is deployed. If a failure of a Rain Gauge would cause great expense, Hydreon recommends redundant Rain Gauges, and even in that case do not assume any liability for consequential damages. It is the responsibility of the system designer and purchasers of the Rain Gauge to be aware of performance limitations of the device. If a Rain Gauge fails for any reason, Hydreon will not be responsible for the labor of servicing and or installing and/or removing the Rain Gauge. Labor is NOT COVERED. Hydreon Corporation recommends that the system designer perform a Failure-Mode Effects Analysis that includes the possibility of Rain Gauge failure. If a potential purchaser of the Rain Gauge does not agree with these terms, we ask that the potential purchaser not buy the Rain Gauge. Deployment of the Rain Gauge implies understanding and agreeing to these limits of liability.

Apply engineering judgment:

Hydreon does not claim the RG-11 is a perfect rain sensor. It is what it is, and senses what it senses.