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Issue: 1.14 Rev. 1.0 Page 22
4.1.16 Menu 16
– Noise Rejection
Warning
Customer adjustment of this setting is not recommended. The module
will be factory set prior to shipment at a value appropriate to the sensor
type fitted. Otherwise changing this value may limit the performance
and, in extreme cases, the instrument may no longer detect gas.
The unit has a noise rejection value associated with the reading and
displaying of the measured gas level.
The noise rejection value is expressed in number of readings that
must be within approximately 20 counts on the AtoD converter of each
other before the display is updated. It takes a value of between 0 and
9, where 0 is no rejection and 9 is the maximum jejection.
Setting the noise rejection results in a two second delay for quick
changing gas levels.
•
Press MENU to open the menu system.
•
Using the NEXT and PREVIOUS buttons, select menu option:
E:16
•
Press ENTER. The display shows the Noise rejection value.
•
Use the UP / DOWN keys to set the desired level.
•
Press ENTER to store the new value in the memory.
Note: Pressing the MENU button rather than the ENTER button
exits without any change.
•
Press MENU to close the menu system.
Note each range noise rejection differs in the equivalent gas level as
follows:
Range
%vol
Fixed A to D
Counts
Typical span
factor
Equivalent gas
level %vol
0.00 - 0.0200 20 0.05 0.0001
0.02 - 0.1000 20 0.3 0.0006
0.10
– 1.0000
20 3.5 0.0070
0.0
– 5.0
20 0.004 0.08
5.0
– 25.0
20 0.013 0.26