Strange problem appeared on one optical level sensor. It has worked for at about two months perfectly in auto top of mode. Couple of days ago I noticed that top of haven't worked at all.
I checked first that whether profilux level control was in error mode...no, profilux happily indicated that sensor was in water (similarly as another level sensor in my system), however this sensor wasn't even near the water level. I checked whether the cable of the sensor was damaged...nothing... I unplugged the sensor and plugged it in, exactly within 10sec Profilux realized that sensor is not touching water and activated auto top of as programmed.
It worked for about a day, then same problem appeared. This time I started to examinate the sensor itself, but I found it to be clean and there was nothing different when compared to another sensor I have. Finally I got sensor to realize that it is not touching water...by touching the head the of the sensor by finger! I tested this for at least dozen times... each time I touch the head of sensor by finger it activates auto top of within 10sec (as programmed)... when I remove my finger... within 10sec auto top of is inactivated.
Or if I unplug the sensor cable and plug it in, Profilux will then realize that it is not touching water and will work for some time... until it again cannot distinguish air from water, but finger/cloth touching the sensor will make the difference.
Can two months old sensor just malfunction this way? Anybody any idea what is wrong with this one? Another level sensor in the system works perfectly, there has been absolutely no changes to the system within two months. This is bit scary incidence since I thought these sensors to be really fault safe and not activate if there are any problems with the sensor or the cable. Happily this didn't create a flood.
I checked first that whether profilux level control was in error mode...no, profilux happily indicated that sensor was in water (similarly as another level sensor in my system), however this sensor wasn't even near the water level. I checked whether the cable of the sensor was damaged...nothing... I unplugged the sensor and plugged it in, exactly within 10sec Profilux realized that sensor is not touching water and activated auto top of as programmed.
It worked for about a day, then same problem appeared. This time I started to examinate the sensor itself, but I found it to be clean and there was nothing different when compared to another sensor I have. Finally I got sensor to realize that it is not touching water...by touching the head the of the sensor by finger! I tested this for at least dozen times... each time I touch the head of sensor by finger it activates auto top of within 10sec (as programmed)... when I remove my finger... within 10sec auto top of is inactivated.
Or if I unplug the sensor cable and plug it in, Profilux will then realize that it is not touching water and will work for some time... until it again cannot distinguish air from water, but finger/cloth touching the sensor will make the difference.
Can two months old sensor just malfunction this way? Anybody any idea what is wrong with this one? Another level sensor in the system works perfectly, there has been absolutely no changes to the system within two months. This is bit scary incidence since I thought these sensors to be really fault safe and not activate if there are any problems with the sensor or the cable. Happily this didn't create a flood.
