I am a trustee of a small water system. We want to monitor the chlorine level in our intake tank. The idea would be that some kind of a probe in the tank. If the level dropped below 0.3 ppm or rose above 0.6 ppm, then a switch would close and set off an alarm. We have the alarm system based on a modified walkie talkie. The problem is what kind of equipment would be necessary in the tank. The system is "up in the hills" so, as much as possible, it should stand alone.. no fancy equipment which requires monitoring. the probe can be mounted at the ooutflow end of the tank so that there would be a constant flow of water.

Thanks
Jim Lewall