GEM-2000 Easy Steps - Field Calibration

Field Calibrating the GEM-2000

Note: Be sure to always have the GEM-2000 instrument turned on prior to connecting the calibration gas bottles.

• Turn Instrument On (By pressing on the Red Button).
• After the instrument has finished it's initial process, it will enter the Main Screen.
• Press 1 Menu
• Use your Up(2) or Down(8) keys to scroll the "Field Calibration" then press Enter in your instrument
• Press 3 Edit target Concentrations
• Enter manually the target concentrations for CH₄
• Press Enter to move to CO₂, Enter CO₂ Target Concentration
• Press Enter to move to O₂, Enter O₂ Target Concentration
• Press Enter to complete.
• Connect Calibration (CAL) Gas Bottle with 0% CH₄ (example 4% O₂, Bal N₂)
• Allow gas to flow for approximately 30 seconds to ensure a compete purge of any gas in instrument
• Press Enter to bring up Calibration Menu
• Choose Zero Channels, Press Enter
• Choose Zero CH₄ Press Enter when done.
• If Calibration was successful you should see the following message “User Zero Complete”
• Connect CAL Gas Bottle With 0% O₂ (example 50% CH₄ 35%CO₂ Bal N₂)
• Allow gas to flow for approximately 30 seconds to ensure a compete purge of any gas in instrument
• Press Enter to bring up Calibration Menu
• Choose Zero Channels press Enter
• Choose Zero O₂ press Enter when done
• If Calibration was successful you should see the following message “User Zero Complete”
• Press Enter to go to Calibration Menu
• Choose Span Channels, Press Enter
• Choose Span CH₄
• Verify that CH₄ Calibration (CAL) Gas is still connected to instrument (Wait 30 seconds for gas to flow thru instrument)
• Press Enter to Set CH₄ Span
• The following message should appear “Calibration Complete”
• Press Enter to go to Calibration Menu
• Choose Span Channels, Press Enter
• Choose Span CO₂
• Verify that CH₄ CAL Gas is still connected to instrument (Wait 30 seconds for gas to flow thru instrument)
• Press Enter to Set CO₂ Span
• The following message should appear “Calibration Complete”
• Connect Gas Bottle With 4% O₂ (example. 0% CH₄ 0% CO₂ 4%O₂)
• Allow gas to flow for approximately 30 seconds to ensure a compete purge of any gas in instrument
• Press Enter to go to Calibration Menu
• Choose Span Channels, Press Enter
• Choose Span O₂
• Press Enter to Set O₂ Span
• “Field Calibration is Complete”
• We suggest taking a reading from CAL GAS Bottles to verify that calibration has been done correctly.