Black & Decker MULTI-GAS DETECTORS Manuel d'utilisateur télécharger pdf (Page 39)

BW Defender2

User Manual

Auto Span

The display shows a flashing gas cylinder and beeps twice,

prompting you to apply a calibration gas to the sensor or skip

the span (sensitivity adjustment):

Use a calibration gas containing the gas concentrations listed

in the Guidelines.

Apply gas to the sensor at a flow rate of 250 to 500 ml/min.

2. Or, press now to skip the span.

When the detector senses approximately one-half of the

expected gas concentration (30 seconds), the audible alarm

beeps once. The detector then begins spanning the sensor

(2 minutes).

The audible alarm beeps three times at the end of the span.

Note

The detector will not span a sensor if:

• You do not apply gas to the sensor.

• The sensor fails to detect at least one-half of

the expected gas concentration in the first 30

seconds.

• The gas concentration drops below one-half of

the expected gas level during the

2-minute span.

If you apply gas to a sensor and the detector fails to

span the sensor, repeat the calibration process

using a new gas cylinder. If the sensor fails the span

a second time, replace the sensor. (See the section,

“Replacing a Sensor”)

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Black & Decker MULTI-GAS DETECTORS Manuel d'utilisateur Page 39