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Hi all, I think this question might have been posted in the past. I looked through the archives and found some stuff on the topic but not everything... I have an application that 'requires' monitoring several remote storage tanks. At each remote site there is only one or two points that need to be monitored (level). I would like to use something like a spread-spectrum radio modem since it would not require a licence and there is not necessarily any power, let alone telephone, in the tank location. These tanks are regularly moved to different parts of the fields as well. In other words, the cost for a hardwired system would be too expensive to maintain. The distance to these tanks is generally less than 10 miles. Total number of remote sites will probably be less than ten. I was figuring that I would need a solar cell type installation since there would not be any power available. The level reading need not be continuous, rather, it can be on a regular polled basis - perhaps once or twice a day. However, it would be nice to have the remote transmitter send a logged history of the level. That is, log the continuous values but only send the stream to the PLC twice a day. The monitoring PLC will be either a SLC-5/05 or a SLC-5/03. Any suggestions on what to do. I have never done anything like this, so even the most basic help would be appreciated. Also, what ball-park costs do you think would be involved? Currently, there is a person that drives around once every couple of days to check the tank levels. If the 'automated' cost is less than the 'manual' cost then I can justify installing the system. Thanks for any advice. Bill Townsley