D-Guard² Instruction Manual
Item Number 201018
18
15.3 Calibration Modes
Figure 13. Trend Bar states.
Trend Bar State
Concentration
Percentage full scale
Rate of change / second
Falling
> 3%
Falling
1% < x ≤ 3%
Falling
0.1% ≤ x ≤ 1%
Stable
< ± 0.1%
Rising
0.1% ≤ x ≤ 1%
Rising
1% < x ≤ 3%
Rising
> 3%
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.
15.4 Calibration Trend Bar
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.
