Crowcon Gasman II Technical Description - Page 5

Browse online or download pdf Technical Description for Monitor Crowcon Gasman II. Crowcon Gasman II 18 pages. Portable gas detector

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Sheet 3 (Sensor PCB)

This is a simple PCB that plugs into the Main PCB via connector J1. It contains the buzzer and the two LEDs along with

two sites for a gas sensor. The two sites are necessary to accommodate the two slightly different physical shapes of the

gas sensors and are overlaid so as to position each of the gas sensor types in the same place when fitted.

Sheet 4 (Optional Low-Power Transmitter PCB)

This simple PCB plugs into the CPU/Display PCB via J1 which carries both power and the two LED control signals. The

LED control signals are 'ORed' together on this PCB to provide a 10Hz modulation waveform. This waveform is used to

power the transmitter module, IC1, using FETs Q1 and Q2.