Menu 1 - Calibrate Sensor - Ntron Microx Online User Instruction Manual

Menu 1 – Calibrate sensor
4.1.1
This should ideally be performed using certified compressed Gas @20.9%
Oxygen. This is typically provided from a portable cylinder with a suitable flow
and pressure control adaptor. It may be necessary to disconnect the sample in
pipe/tube connection to the Microx Online, and connect a suitable tube from
the portable cylinder into the sample in bulkhead fitting.
Alternatively, if 20.9% Oxygen can be introduced safely into the process line,
this can be another option for calibration.
Where neither of the above are possible, an Ambient air calibration can be
made but as no pressure and hence flow will be behind the Oxygen , the
characteristics of the calibration with still Air as opposed to pressurised Air will
result in some measurement reading offset of small value, when the sample
gas is re-connected.
•
Press the MENU button to open the menu system.
•
Using the NEXT and PREVIOUS buttons select menu option:
E:1
•
Press ENTER.
•
Allow time for sensor to respond/stabilise.
•
Using the INC and DEC buttons set the reading to that of the
calibration gas level.
•
Press ENTER to span the sensor, '– – – –'will be displayed to
confirm the sensor span has been performed.
Note: Pressing the MENU button rather than the ENTER
button exits the span feature without performing the
calibration.
Wait until the reading is stable, if not press the ENTER
button to span the sensor.
•
Press the MENU button to close the menu system.
Note: The sensor span setting will be displayed ( as a
percentage value) on exit while the MENU key is pressed.
Note that this value is a percentage of the initial calibration
value set via "New Sensor Data" in menu E:14. See note
below.
Note: On each occasion that a new sensor is connected and calibrated the
"New Sensor Data" should be set via the procedure in menu 14. The
setting should only be carried out after the calibration and not before.
This will ensure that subsequent span setting figures displayed on exit
of menu 1 will be valid.
Issue: 1.14 Rev. 1.0 Page 14