BW Technologies GasAlert Extreme User Manual download pdf (Page 46)

GasAlert Extreme

User Manual

Span

Note

To bypass the span function, press

C to automatically pro-

ceed to the alarm setpoint screens. If the span is bypassed, the

calibration due date cannot be changed.

Verify that the calibration gas being used matches the span

concentration values that are defined for the detector. For

more information, refer to Calibration Guidelines

6. The set span screen displays a flashing .

Note

The flashing does not display for oxygen (O

) detectors.

7. Apply the calibration gas.

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

(for NH

, Cl

, and ETO: 1000 ml/min.)

The gas readings change as gas is applied to the sensor. When

the detector senses a sufficient concentration of gas (approxi-

mately 30 seconds), the detector beeps once.

9. The detector then begins spanning the sensor as follows:

•NH

, Cl

, ClO

, O

, and ETO: 5 minutes to span

•O

: 30 seconds to span

• other gases: 2 minutes (approximately) to span.

The detector beeps three times when the span is complete.

Successful Span

If the span is successful, the LCD automatically displays the calibration

due date screen.

Unsuccessful Span

If the detector fails to span a sensor successfully,

FAIL displays.

The detector vibrates and beeps, and the LEDs flash. Then the detector

automatically proceeds to the alarm setpoint screens.

If the span fails confirm that

• gas is being applied to the sensor,

• the sensor is detecting a sufficient gas concentration within

30 seconds, and

• the gas concentration has not dropped significantly during the

2-minute span.

If the span is still unsuccessful, use a new gas cylinder.

If the span continues to be unsuccessful, replace the sensor. Refer to

Replacing the Battery or Sensor

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BW Technologies GasAlert Extreme User Manual Page 46

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