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GasAlertMaxXT II
Calibration
Calibration
Guidelines
Recommended gas mixture:
CO: 100 ppm balance N
2
H
2
S: 25 ppm balance N
2
LEL: 50% LEL or 2.5% by vol. methane balance air
O
2
: clean air, 18%
• To ensure accurate calibration, use a premium-grade calibration
gas. Gases approved by the National Institute of Standards and
Technology (NIST) improve the validity of the calibration.
• Do not use a gas cylinder past its expiration date.
• Calibrate a new sensor before use. Install the sensor, activate the
detector, and allow the sensor to stabilize before starting calibra-
tion or a bump test.
Used sensor: 60 seconds / new sensor: 5 minutes.
• Calibrate the detector at least once every 180 days, depending
upon use and sensor exposure to poisons and contaminants.
• Calibrate the detector if the ambient gas varies during startup.
• Calibrate only in a safe area that is free of hazardous gas.
• Do not calibrate the detector during or immediately after charging
is complete.
• The H
2
S, CO, LEL and O
2
sensors can be automatically zeroed
each time the detector is activated if the Auto-Zero on Startup
option is enabled. Activate the detector in a normal (20.9%/20.8%
O
2
) atmosphere.
• If a certified calibration is required, contact BW Technologies by
Honeywell.
• Calibration can be performed using either a 0.5 l/min regulator or a
demand flow regulator.
• The maximum hose length for calibration is 3 ft (0.9 m).
a Warning
Calibration cylinders that are used with a demand flow
regulator must meet the following maximum inlet
pressure specifications:
• Disposable cylinders 0-1000 psig/70 bar
• Refillable cylinders 0-3000 psig/70 bar
BW recommends using premium grade calibration gases
and cylinders that are certified to National Standards.
The calibration gases must meet the accuracy of the
detector.
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