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D-Guard² Instruction Manual
15.3 Calibration Modes
The D-Guard² has two calibration modes, Auto and Manual.
The Auto calibration mode checks that the rate of change of the detected gas has
decreased to less than ± 0.1% of full scale per second, and adjusts the D-Guard²
response automatically.
The Manual calibration mode allows the user to adjust the D-Guard² calibration when
the response has stabilised.
Use the Trend Bar to determine when the rate of change of the detected gas has
decreased to less than ± 0.1% of full scale per second.
15.4 Calibration Trend Bar
The D-Guard² has a trend bar to show the detected rate of change of the applied gas.
The trend bar has seven different positions and provides a clear visual indication of
the rate of change of the detected gas concentration levels.
Trend Bar State
Figure 13. Trend Bar states.
18
Concentration
Falling
Falling
Falling
Stable
Rising
Rising
Rising
Percentage full scale
Rate of change / second
> 3%
1% < x ≤ 3%
0.1% ≤ x ≤ 1%
< ± 0.1%
0.1% ≤ x ≤ 1%
1% < x ≤ 3%
> 3%
Item Number 201018
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