If the alarms were integral to the transmitter, then the overall cost would be higher and many users would buy a function they do not want.  There are also several features that result from the alarm being a separate module:

  1. Modularity allows several alarm units to operate off of one signal source.
  2. The alarm is able to directly operate small motors and valves, eliminating the need to link up with a PLC or DCS.  Only the iT Alarm uses power relays with the capacity to switch 250 VAC, 8A-resistive or 1/3HP inductive machines.
  3. Having the alarm as a separate unit allows using it with an LPS® 4-20mA vibration sensor or any 4-20mA sensor such as temperature, pressure, level, flow, force or speed.