3M GD-6 User Manual

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7.  Press the 

Enter button and the display will read 10 alternating with the gas, mE, pro or Hy (blinking), indicating the sensor 

is looking for gas. 

8.  Start applying gas to the gas sensor.
note: The sensor will look for the gas for 45 seconds. If no gas is applied or detected in that time, the display will return 

to CaL.
9.  When the sensor detects the gas, the display will flash back and forth between the 

gas concentration and Spn and the 

calibration will progress. The display will show this for a maximum of 165 seconds.

10.  When the calibration is successful, the display will flash back and forth between 

10 and paS.

11.  Remove the gas. The display will return to “

Spn”, then normal mode. The calibration is done.

12.  If the calibration fails, the display will flash back and forth between the gas concentration and 

FaL (fail). If this occurs, 

check the pressure gauge on the regulator. If the pressure is less than 25psi the flow of gas may not be adequate to

properly calibrate the unit. If there is proper pressure in the cylinder repeat steps 4 through 11. If the unit fails to calibrate 

twice contact 3M Macurco Technical Assistance at 1-800-237-9049.

13.  Disassemble the cylinder and regulator.
14.  Re-assemble the 3M™ Macurco™ GD-6 Combustible Gas Detector (make sure the LED is aligned with the hole in the 

front case).

15.  See Calibration Flowchart.
3M FIXED GaS DETECTIon proDUCTS LIMITED WarranTY

3M warrants the GD-6 gas detector will be free from defective materials and workmanship for a period of two (2) years from 

date of manufacture (indicated on the inside cover of the GD-6), provided it is maintained and used in accordance with 3M 

instructions and/or recommendations. If any component becomes defective during the warranty period, it will be replaced or 

repaired free of charge, if the unit is returned in accordance with the instructions below. This warranty does not apply to units 

that have been altered or had repair attempted, or that have been subjected to abuse, accidental or otherwise. The above

warranty is in lieu of all other express warranties, obligations or liabilities. THE IMPLIED WARRANTIES OF MERCHANTABILITY

AND FITNESS FOR PARTICULAR PURPOSE ARE LIMITED TO A PERIOD OF TWO (2) YEARS FROM THE PURCHASE DATE. 3M shall

not be liable for any incidental or consequential damages for breach of this or any other warranty, express or implied, arising

out of or related to the use of said gas detector. Manufacturer or its agent’s liability shall be limited to replacement or repair 

as set forth above. Buyer’s sole and exclusive remedies are return of the goods and repayment of the price, or repair and 

replacement of non-conforming goods or parts.

Website: www.3M.com/OccSafety  

Technical Assistance: 1-800-243-4630

For other 3M products: 

1-800-3M-HELPS or 

1-651-737-6501