Cambridge Sensotec Rapidox 1100ZR-H-OL O
2
Analyser Instruction Manual
Version 1.2
9
Last printed 22/07/2015 18:02:00
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 7.17 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.
7.8
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 8.6. 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.
7.9
Alarms
The Rapidox is fitted with two independent and fully programmable alarm relay
outputs, which can be programmed to be either normally open (N/O) (closes on
alarm) or normally closed (N/C) (opens on alarm). You have the option of
assigning each alarm to the oxygen, pressure (internal) or temperature sensors, as
well as enabling the alarm relay circuits, enabling an audible buzzer and enabling
a visual warning on the screen.
The alarms can be programmed by the user via the keypad (2) on the front panel
or using the software provided (section 8.5.3 ). To change the alarm settings scroll
down the menu to no. 3 “Set Alarms” and press ENT. Now use the UP & DOWN
arrows to select “Alarm 1” or “Alarm 2” and press ENT. The next screen shows
the message “Assign To:”. Use the UP and DOWN arrows to select O
2
, or Pressure
depending on which measurement you want the alarm to work with, and press