Black & Decker MULTI-GAS DETECTORS Manuel d'utilisateur télécharger pdf (Page 43)

GasAlertMax

Calibration and Setting 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 oxygen sensor can be automatically calibrated on

activation if this feature is enabled. Activate detector in a

normal (20.9% O

) atmosphere.

• If you require a certified calibration, contact

Technologies.

• High CO concentrations above the top of the measuring

range are not indicated as OL (transgression of the

measuring range). If the end of the measuring range is

exceeded, the function of the apparatus has to be

checked with test gas.

• CO measuring values from –3 ppm (v/v) up to +3 ppm

(v/v) and H

S measuring values from –1 ppm (v/v) up to

+1 ppm (v/v) are indicated during measuring operation

as 0 ppm (v/v).

• The cross sensitivities described in the sensor

datasheet are to be considered. Due to sensor cross

sensitivities, H

S concentrations within the measuring

range can cause a CO indication.

• H

S concentrations within the measuring range can

cause an adverse effect on the catalytic LEL sensor.

After an H

S alarm, it is necessary to check the

measuring function of the LEL sensor.

Note

The detector must be calibrated if a negative

measuring value is indicated during operation.

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Black & Decker MULTI-GAS DETECTORS Manuel d'utilisateur Page 43