Calibration/Accuracy Verification WARNING The Canadian Standards Association (CSA) requires the instrument to undergo calibration when the displayed LEL value during a bump test fails to fall between 100% and 120% of the expected value for the gas. For recommendations concerning calibration frequency, see Appendix B . 4.1 Calibration/Accuracy Verification The accuracy of the IQ Force maybe verified at anytime by performing a simple calibration/accuracy check. To perform this check, do the following. Turn the IQ Force on and wait at least three minutes to allow the readings to fully stabilize. If any of the sensors have just been replaced, the new sensors) must be allowed to stabilize prior to use. See Section 5.4 for further details on sensor stabilization requirements. Make sure the instrument is located in fresh air. Verify that the current gas readings match the concentrations present in fresh air. The oxygen (O) sensor should read 20.9% (±0.2% vol. The readings for the LEL sensor should be 0% LEL and toxic sensors should read 0 or 0.0 parts-per-million (ppm) in fresh air. If the readings deviate from the expected levels in afresh- air environment, proceed to Section 4.2 and perform the fresh-air calibration adjustment then proceed to step 4.