Ntron Microx Online, User Instruction Manual

Page: 21 / 29

Issue: 1.14 Rev. 1.0 Page 19
4.1.11 Menu 11
– PPM sensor Gain
4.1.12 Menu 12
– % vol sensor gain
This option is used to allow the user to adjust the sensor gain for optimal
performance. Care should be taken when using this option, which is normally
only used when a new sensor is fitted.
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 display alternates between the sensor signal level, indicated as a number
between 0 and 4095, and the menu number, E:11. The value used should be
about 3500.
The display indicates the gain setting when the Up / DOWN keys are pressed.
The gain is between 0 and 31, a typical value would be 3.
Apply 13 mV to the sensor input.
•
Press MENU to open the menu system.
•
Using the NEXT and PREVIOUS buttons, select menu option:
E:12
•
Press ENTER. The display shows the sensor peak output level.
•
Use the INCREASE and DECREASE buttons to set the required
signal level.
Note: When the INCREASE and DECREASE buttons are
being operated the display shows the amplifier gain setting
as a number between 0 and 31. The larger the number the
higher the gain, the lower the signal reading.
•
Press ENTER to store the new value.
Note: Pressing the MENU button rather than the ENTER button
exits without any change.
•
Press MENU to close the menu system.
Note: The signal gain setting will be displayed on exit while
the MENU key is pressed.
Customer adjustment of this setting is not permitted.