3M GD-6 User Manual

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To change settings, remove the Philips screw on the front of the 3M™ Macurco™ GD-6 Combustible Gas Detector. Pull off the 

front cover of the unit.

To select the 

Gas option, in normal mode, press the Next button once to display the current gas selection (mE is Methane, 

pro is propane and Hy is Hydrogen). Then press the Enter button twice to enter the selection menu. The currently selected 

gas will be shown on the display. Press 

Next to scroll through the available gases selections. The selected gas will be flashing, 

press 

Enter to select the gas and Enter again to confirm the selection. To return back to normal mode press Next until “End” is 

displayed and press 

Enter.

To select the Default Configuration, in normal mode, press the 

Next button twice to get to “Con” or the Configuration menu. 

Then press the 

Enter button to enter the Con menu. The first selection is the “dEF” or Default setting. Press Enter. If it is 

already in Default configuration, there will be no action. If it is not already in Default configuration, “nO” will be displayed. Press 

Next to change it to “YES” (flashing) then press Enter to confirm the change (solid) and press Enter again to return to “dEF” in 

the Con menu. Press 

Next until “End” is displayed then press Enter to return to normal operation. 

To select the 

power Up Test Configuration, in normal mode, press the Next button twice to get to “Con” or the Configuration 

menu. Then press the 

Enter button to enter the Con menu. Then press the Next button to get to the second selection “PUt” 

or 

power Up Test setting. Press Enter. If the test is “On” press Next to turn it “OFF” (flashing) then press Enter to confirm the 

change (solid) and press 

Enter again to return to “PUt” in the Con menu. Press Next until “End” is displayed then press Enter 

to return to normal operation. 

To select the Display Configuration, in normal mode, press the 

Next button twice to get to “Con” or the Configuration menu. 

Then press the 

Enter button to enter the Con menu. Then press the Next button twice to get to the third selection “dSP” or 

Display setting. Press 

Enter. If the display is “On” press Next to turn it “OFF” (flashing) then press Enter to confirm the change 

(solid) and press 

Enter again to return to “dSP” in the Con menu. Press Next until “End” is displayed then press Enter to return 

to normal operation. 
Selecting Buzzer option – “bUZ”

To select the Buzzer Configuration, in normal mode, press the 

Next button twice to get to “Con” or the Configuration menu. 

Then press the 

Enter button to enter the Con menu. The fourth selection is the “bUZ” or Buzzer setting. Press Next three 

times to get to “bUZ” then press 

Enter. If the display is “On” press Next to turn it “OFF” (flashing) then press Enter to confirm 

the change (solid) and press 

Enter again to return to “bUZ” in the Con menu. Press Next until “End” is displayed then press 

Enter to return to normal operation. 
Selecting alarm relay Setting – “arS”

To select the Alarm Relay Setting, in normal mode, press the 

Next button twice to get to “Con” or the Configuration menu. Then 

press the 

Enter button to enter the Con menu. The fifth selection is the “ArS” or Alarm Relay Setting. Press Next four times to 

get to “ArS” then press 

Enter. If the display is “OFF” (disabled) press Next to change it to 5, 10, 15, 20 or 25% LEL (flashing) 

then press 

Enter to confirm the change (solid) and press Enter again to return to “ArS” in the Con menu. Press Next until “End” 

is displayed then press 

Enter to return to normal operation. 

To select the 

alarm relay Configuration, in normal mode, press the Next button twice to get to “Con” or the Configuration 

menu. Then press the 

Enter button to enter the Con menu. The sixth selection is the “Arc” or Alarm Relay Configuration. Press 

Next five times to get to “Arc” then press Enter. If the relay is “nO” (normally open) press Next to turn it to “nC” (flashing) then 

press 

Enter to confirm the change (solid) and press Enter again to return to “Arc” in the Con menu. Press Next until “End” is 

displayed then press 

Enter to return to normal operation. 

To select the Fan Relay setting, in normal mode, press the 

Next button twice to get to “Con” or the Configuration menu. Then 

press the 

Enter button to enter the Con menu. The seventh selection is the “FrS” or Fan Relay setting. Press Next six times 

to get to “FrS” then press 

Enter. If the fan relay is “OFF” (disabled) press Next to change it to 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 

13, 14, 15, 16, 17, 18, 19 or 20% LEL (flashing) then press 

Enter to confirm the change (solid) and press Enter again to return 

to “run” in the Con menu. Press 

Next until “End” is displayed then press Enter to return to normal operation. 

To select the Fan Relay Delay setting, in normal mode, press the 

Next button twice to get to “Con” or the Configuration 

menu. Then press the 

Enter button to enter the Con menu. The eighth selection is the “FrD” or Fan Relay Delay. Press Next 

seven times to get to “FrD” then press 

Enter. If the delay is “OFF” (disabled) press Next to change it to 1, 3, 5, or 10 minutes 

(flashing) then press 

Enter to confirm the change (solid) and press Enter again to return to “FrD” in the Con menu. Press Next 

until “End” is displayed then press 

Enter to return to normal operation.