Routes ................................................................................................................................................................ 47
Adjust backlight .................................................................................................................................................. 47
Adjust volume .................................................................................................................................................... 48
User Prompts ..................................................................................................................................................... 49
Exit menu ........................................................................................................................................................... 49
Taking readings ...................................................................................................................................................... 50
Creating an ID .................................................................................................................................................... 51
Change screen layout ......................................................................................................................................... 52
Answering site questions ................................................................................................................................... 52
Answering ID questions...................................................................................................................................... 52
Special action ..................................................................................................................................................... 53
Configuration of the data logging option ........................................................................................................... 54
GEM analyser in GA mode ................................................................................................................................. 55
Flow devices ....................................................................................................................................................... 55
How to use an anemometer (optional) .............................................................................................................. 56
How to use a Pitot tube (optional) ..................................................................................................................... 59
How to use an H2S filter (optional) .................................................................................................................... 60
How to use a temperature probe (optional) ...................................................................................................... 63
How to identify a borehole using the GPS feature (optional) ............................................................................ 64
Taking gas and flow measurement .................................................................................................................... 66
Calibration .............................................................................................................................................................. 68
Calibration introduction ..................................................................................................................................... 68
Frequency of calibration – best practice ............................................................................................................ 68
Calibration gases ................................................................................................................................................ 69
Calibration set-up............................................................................................................................................... 70
Calibration equipment ....................................................................................................................................... 70
Gas analyser ....................................................................................................................................................... 71
Calibration processes – best practice ................................................................................................................ 71
Gas check in fresh air ......................................................................................................................................... 73
Calibration – mixtures 1, 2 & 3........................................................................................................................... 74
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