1100-2294 Rev 1 37b. Manual: tap MAG#1 within 30-seconds or the instrument will time-out and returnto normal operation.4. Complete zero adjustment:a. MGS-400 App: app will countdown to completion. If calibration is successful,proceed to Step 5. If calibration is unsuccessful, return to the Home screen andpress the Acknowledge button to clear the zero calibration fault.b. Manual: the LED will blink green-red, green-red-red, green-red-red-red, etc. untilcalibration is complete. To abort, hold MAG#1 for >5-seconds, turn off gas flowand remove the calibration adapter. If calibration is successful (green LED),proceed to Step 5. If calibration is unsuccessful (LED blinks orange @ 2 Hz), tapMAG#1 to discard the calibration attempt.5. Turn off gas flow from zero gas.6. Replace zero gas with calibration gas in preparation for span adjustment.5.2.4 Span AdjustmentWARNING: Except for CO2 or O2 sensors, calibration gas must be in a balanceof air, not nitrogen (N2).IMPORTANT: At elevations higher than 6,560’ (2,000 m), calibration will result ina lower reading. Above 6,560’, the instrument should be calibrated in theenvironment of operation.1. Begin span adjustment:a. MGS-400 App: scan barcode on gas cylinder or manually enter values forcalibration gas.b. Manual: hold MAG#2 for >5-seconds. The LED will blink green-green-orangewhen the instrument is ready.2. Apply calibration gas at the concentration listed on the calibration gas concentrationlabel (located on top of the instrument). Part Number Serial Number Sensor Type Maximum Range3. Confirm the start of calibration:a. MGS-400 App: press the Start Span button.b. Manual: tap MAG#2 within 30-seconds or the instrument will time-out and returnto normal operation.4. Complete span adjustment:a. MGS-400 App: app will countdown to completion. If calibration is successful,proceed to Step 5. If calibration is unsuccessful, return to the Home screen andpress the Acknowledge button to clear the span calibration fault.