GasAlertMax
User Manual
24
D1430/2 English
Calibration and Setting Alarm Setpoints
Guidelines
Caution
The detector must be calibrated using the
following gas concentrations: H
2
S =
==
= 25 ppm,
CO =
==
= 100 ppm, Methane =
==
= 2.5 %
%%
% (50 %
%%
% LEL), and
balance air.
If you do not calibrate all of the sensors, use the
gas concentration listed above for the target
sensor being calibrated.
When calibrating the detector, adhere to the following
guidelines.
• CG-Q58 Calibration Gas (four-gas mix) is available from
BW Technologies. (See the section "Replacement Parts
and Accessories.")
• 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. Allow the sensor to
stabilize before starting calibration (used: 60 seconds;
new: 5 minutes).
• Calibrate the detector at east 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.
• Calibrate only in a clean atmosphere, which is free of
background gas.
• To disable an alarm, set its alarm setpoint to 0.
• The LEL sensor is factory calibrated to methane. If
monitoring a different combustible gas, calibrate the
sensor using the appropriate gas.
• The O
2
sensor is automatically calibrated on activation.
Activate detector in a normal 20.9% O
2
atmosphere.
• If you require a certified calibration, contact BW
Technologies using one of the numbers on page 2.
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