Temperature alarms give out an alarm when the
temperature goes beyond a specified limit. There are two kinds of temperature alarms -
ones that displays the current temperature as well as give an alarm when the monitored
temperature crosses the specified threshold. The other kind of alarm only gives an alarm
(also called analogue alarm).
The temperature alarm comes with two wire or three wire probes (one that detects
temperature). These probes are usually flexible and can be located even a few meters away
from the temperature alarm. For very long distances, Extenders are required to be placed
close to the probe. Extenders are basically nothing but amplifiers that compensate for the
loss of signal due to long length of wire.
The temperature alarm can be standalone or connected to a central panel or a PC network.
The standalone systems have a built in alarm whereas the ones connected to a central panel
give signal to the central panel. The central panel then takes the appropriate action e.g.
Sound alarm, dial emergency numbers, start AC or fans, stop particular machines etc.
Some temperature alarms have specific provision to connect to NMS (Network Monitoring
Systems) of computer networks. By having such facility the alarms can be monitored from
anywhere. |
