Good point. Does the sensor itself have a maximum depth allowed? I plan to get moisture sensor from different depths. I believe it shares the same number of maximum sensors with WH51 right?
The manual indicates that the cable is one metre in length. They do recommend that the device be at least 20cm above ground, which would suggest a limit of 80cm in depth - but I'm sure you could experiment to see how low you can actually go and still have adequate RF reception.
As for the limit of eight sensors, that is per receiver (gw* or console.) If you have a need for more than eight sensors, you can get an additional gw* device for every eight sensors, and then you will simply need to force registration of each sensor into the appropriate slot of the desired gw device, and of course you'll need to interpret the results appropriately.
Note that you may even consider getting some sensors on an alternate frequency, with the gw* on that same frequency. As an example, I have eight WH51 sensors using 915 MHz, received by a GW1000B at 915 MHZ. I then bought an additional eight WH51 sensors, but this time using 433 MHz, and a GW1000C also using using 433 MHz. They all peacefully coexist, and I simply have my software read sensors from both GW* devices and associate the data with the correct interpretation using the sensor IDs. (I actually also have more 915 MHz sensors, which are received by a third GW1000B, but that's getting more complicated...)
---Jonathan
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