Gas detection controller OC-4000

OC-4000 gas detection controller with two channels or four channels, it composed of the metal shell, Power key, main board, interface board, alarm, etc. The display screen is the 0.8 inch Nixie tube, for displaying each gas concentration, also with the indicate light for the each channel. When press the key, if press less than 20ms, the key signal will be invalid, when the time between the 20ms~3s, the key signal is normal. If more than 3m, the key signal will be long-press.