The procedure to view or set up the gas detection mode from the Modes screen on G8.

1. From the Status screen, press the left or right side button to cycle through the Feature screens until the Modes screen displays.
   
2. Press the center button to select the Modes option, then press the left and right buttons to scroll through the available modes until the target mode displays.
   

   Note: If the mode selected uses a pump, G8 tests the pump flow before entering the mode.
3. Press the center button to start G8 in the target mode.
   If the mode selected uses a pump, G8 tests the pump flow before entering the mode.
4. Follow the onscreen steps to complete the block test, blocking and unblocking the gas flow when prompted.
   G8 goes into the selected mode. The Status screen displays the current mode in the banner and inverts its color scheme.
5. If configured, the Modes screen can also show details about the current mode, such as pump flow rate, set hose length, and sample timer countdown.
   
6. To stop the current mode, display the Modes screen, then press the center button to confirm you want to stop the mode and return to Normal mode.