Problem: I need a low pressure alarm on my instrument air system, but I can’t afford to have a system shutdown if the pressure transmitter fails and the header pressure is still acceptable. I also want to use the signal for monitoring in the Control Room.
Solution: A SPA2 Programmable Alarm with a dual relay and analog output will do the job. Set Relay 1 with a time delay to close when the header pressure falls below an acceptable level and Relay 2 to open if the pressure transmitter fails so a shutdown will not occur.
Model Number Example
SPA2 / HLPRG / 2PRG / U / -AO [DIN]
