Hi all...
need solution for this case..I have signed 1 Ea Gas detector ( use External power +24Vdc) to DCS Yokogawa. before it, 4 ea Gas Detector already signed to that Analog input modules (using internal power),and 1 Ea (External power) also merged to same module, there are 4 Ea GD use internal power & 1 Ea GD using external power. all devices running normally,but..sometimes,I found while 1 Ea gas detector (use external power) loss power (+24Vdc),will caused 4 Ea Gas detector (internal power) will show Hi-Hi alarm with values 50 %LEL,whereas the actual not gas leakage present. and tried to get back online,all condition back to normal,and 4 Ea GD will show normal value.
So, why it could happen like that ? can some body explain to me?please..thanks.. :site::site:
need solution for this case..I have signed 1 Ea Gas detector ( use External power +24Vdc) to DCS Yokogawa. before it, 4 ea Gas Detector already signed to that Analog input modules (using internal power),and 1 Ea (External power) also merged to same module, there are 4 Ea GD use internal power & 1 Ea GD using external power. all devices running normally,but..sometimes,I found while 1 Ea gas detector (use external power) loss power (+24Vdc),will caused 4 Ea Gas detector (internal power) will show Hi-Hi alarm with values 50 %LEL,whereas the actual not gas leakage present. and tried to get back online,all condition back to normal,and 4 Ea GD will show normal value.
So, why it could happen like that ? can some body explain to me?please..thanks.. :site::site: