Black & Decker MULTI-GAS DETECTORS User Manual download pdf (Page 47)

GasAlertMax

Calibration and Setting Alarm Setpoints

Auto Span

The LCD displays K prompting you to apply the calibration

gas to the sensors or you can skip the span (sensitivity

adjustment).

Use a calibration gas meeting the recommended gas mixture

as listed in the guidelines.

5. Apply gas to the sensor at a flow rate of 250 to

500 ml/min.

Press C 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). (These times are valid if a GasAlertMax

calibration gas is used.)

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, press

to exit auto span. Then

press

to exit the calibration and repeat the

calibration process using a new gas cylinder. If the

sensor fails the span a second time, replace the

sensor. Refer to the section,

Replacing a Sensor,

Pump, or Pump Filter.

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Black & Decker MULTI-GAS DETECTORS User Manual Page 47