D11-044-1: Rapidox 1100ZR-H-OL-LC O
2
Analyser Instruction Manual
D11-044-1
8
Last printed 08/11/2016 12:10:00
button to scroll through to the “O
2
Middle” or “O
2
Low” screen. Flush the
sensor chamber with the second calibration gas allowing several minutes
for the new gas to flush through. Wait for the display to become stable
before pressing the ENT button for two seconds. The analyser will then
recalibrate and display “O
2
recalibrated” and then return to normal run
mode. The display will now correctly read the value of the calibration gas.
6)
The analyser is now correctly calibrated and will read accurately between
these two calibration points. Note that this procedure can be performed
remotely using the software described in section 6. You can now repeat
this process for the third calibration gas if required.
7)
If at any time, you encounter difficulties and wish to restore the machine to
its factory set calibration, use the configuration software provided and load
the default settings (described in section 5.17 below). Each machine is
provided with a unique file that contains the factory settings. This is
located on the memory stick provided and is copied onto your PC during
the installation process.
8)
Note that the three calibration points are independent of each other so you
can calibrate the analyser in any order you desire. However please note
that O
2
HIGH must always be greater than O
2
MIDDLE which must always
be greater than O
2
LOW. Typically the factory settings are: O
2
HIGH=20.95%, O
2
MIDDLE=0.1% (1000ppm) and O
2
LOW=0.001%
(10ppm).
NB You must always perform a FULL calibration to achieve good accuracy.
5.8
Cleaning the Sensor
You can clean the sensor at any time by pressing ENT on the keypad (2) and
scrolling down to option 2 “Clean Sensor” or using the software described in
section 6.6. Press the ENT button to proceed. The screen displays “Clean
Sensor?”. Press ENT again and the cleaning will take place. The procedure takes
approximately five seconds and the LCD display shows the progress of the
operation. Once finished the analyser will take a moment to re-stabilise. The
sensor is cleaned each time the unit is switched on prior to operation. If you are
operating in gases with large amounts of soot, there is a risk that the sensor
surfaces will become contaminated with particulates, which will impair
performance if allowed to build up. The cleaning operation pumps oxygen
through the zirconia tube, which burns the particulates away from the sensor
surface.