A
In many of the indoor cabinets that I have used, we usually put a thermostat (a standard Rittal accessory) on the cabinet to give an alarm contact if the temperature goes up.
Recently some projects are asking to install a fan alarm instead, which is meant to give a pre-alarm in case either of the cabinet exhaust fans stop, which may lead to cabinet temperature rise.
I have tried a few sensing methods; using a micro air flow switch near the vent (gives a false alarm as alignment of the flow sensor against the air flow is difficult to adjust), using a current transformer and sensing relay (quite expensive), DC fans with built in alarm contact (not common and long delivery time)
Anyone has used an effective and low cost method?
Appreciate if you can share your experiences.
Recently some projects are asking to install a fan alarm instead, which is meant to give a pre-alarm in case either of the cabinet exhaust fans stop, which may lead to cabinet temperature rise.
I have tried a few sensing methods; using a micro air flow switch near the vent (gives a false alarm as alignment of the flow sensor against the air flow is difficult to adjust), using a current transformer and sensing relay (quite expensive), DC fans with built in alarm contact (not common and long delivery time)
Anyone has used an effective and low cost method?
Appreciate if you can share your experiences.