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GasAlertMax
User Manual
Calibration and Setting Alarm Setpoints
Guidelines
When calibrating the detector, adhere to the following
guidelines.
•
Recommended gas mixture:
CO: 35 to 255 ppm balance N
H
S: 10 to 100 ppm balance N
2
LEL: 10 to 100% LEL or 0.5 to 5% vol. Methane balance
air
O
: Clean air, 20.9%
2
•
CG-Q58-4 calibration gas (four-gas mix) is available
from BW Technologies. (See the section
Parts and
Accessories.)
32
2
2
Replacement
•
Calibration accuracy is never better than the calibration
gas accuracy. BW Technologies recommends a
premium-grade calibration gas. Gases with NIST
(National Institute of Standards and Technology)
traceable accuracy will improve the validity of the
calibration. Do not use a gas cylinder beyond its
expiration date.
•
Calibrate a new sensor before use. Install the sensor,
activate the detector, and allow the sensor to stabilize
before starting calibration (used: 60 seconds; new: 5
minutes).
•
Calibrate the detector at least once every 180 days,
depending on use and sensor exposure to poisons and
contaminants.
•
Calibrate the detector if the ambient gas display varies
at startup.
•
It is best to calibrate the sensor before changing alarm
setpoints.
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