GasAlertQuattro
User Manual
48
Calibration
Calibration is performed to adjust the sensitivity levels of sensors to
ensure accurate responses to gas.
Guidelines
Recommended calibration quad gas mixture:
Note
Ensure balance is nitrogen (N
2
)
CO: 100 ppm
H
2
S: 25 ppm
LEL: 50% LEL or 2.5% by vol. methane
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) ensure the accuracy 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
calibration or a bump test.
Used sensor: 60 seconds / new sensor: 5 minutes
• Calibrate the sensors at least once every 180 days, depending
upon use and sensor exposure to poisons and contaminants.
• Calibrate only in a safe area that is free of hazardous gas in an
atmosphere of 20.9% oxygen.
• If performing a single gas calibration, calibrate the O
2
sensor first.
• 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 (sensors are enabled individually). Activate the
detector in a normal (20.9% or 20.8% O
2
) atmosphere.
• If a certified calibration is required, contact
• Manual calibration is performed using a 0.5 l/min regulator.
To calibrate using the MicroDock II station, use a demand
flow regulator and refer to the
MicroDock II User Manual
.
• The maximum hose length for calibration is 3 ft. (1 m).
• Do not attach the calibration cap until instructed to apply gas.
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/207 bar
BW recommends using premium grade calibration gases
and cylinders that are certified to National Standards to
ensure accurate calibration.
