Cambridge Sensotec Rapidox 1100ZR-H-OL O
2
Analyser Instruction Manual
Version 1.2
16
Last printed 22/07/2015 18:02:00
To program these options scroll down to menu no. 5 “Set Units” and press ENT.
Use the ENT key to progress through the list and the UP & DOWN keys to select
the required units. Once selected press ENT to store and return to run mode.
7.12
Setting the Display Options
The user can select the LCD refresh rate and the format of the line 2 display using
the keypad or the software provided. Scroll down the menu to option no. 6 “Set
up Display” and press ENT. Use the UP & DOWN arrows to select either the LCD
refresh rate or Line 2 Options:
1.
LCD Refresh Interval:
The frequency of the display update can be selected
from 0.1 to 1.5 seconds. The current setting can be edited using the same
method as described previously. Once edited press ENT to store and return
to the main menu. The default setting is 0.3 seconds.
2.
Line 2 Options:
The information displayed on line 2 of the LCD can be
chosen by the user. The options are None or Pressure (displayed in mbar,
bar, psi, torr or KPa. Use the UP & DOWN arrows to select the required
option and press ENT to store and return to the main menu. Note that on
the Heller coded machines the second line display is switched off by
default.
7.13
Pressure Mode
The user has the option of using the reading from the internal pressure sensor to
automatically correct for changes in gas pressure and hence oxygen pressure. A
manual pressure correction value for ambient pressure conditions can also be
entered to improve accuracy of the correction (factory setting is 1013 mbar
absolute). To access this function scroll down to menu option 7 “Pressure Mode”
and press ENT. The desired mode can then be selected using the UP & DOWN
arrows and pressing ENT to store and proceed. The two modes available are:
1.
None
:
If this mode is selected then there is no pressure correction
performed on the oxygen reading. The pressure and oxygen sensor act
independently. If the sensor is working in air (20.95%) and the pressure is
doubled to 1000 mbar then the reading will also double to 41.9%. This is
the correct oxygen partial pressure in air at 2 bar since there is a simple
linear relationship between pressure and concentration.
2.
Auto
:
This is the factory default setting. If the Auto mode is selected then
the Rapidox uses the reading from the internal pressure sensor to correct
the oxygen partial pressure and maintain a concentration reading. If the
sensor is working in air (20.95%) and the pressure suddenly jumped to, for
example, 500 mbar above atmospheric, the oxygen reading would remain at
20.95% because the sensor has been corrected for the pressure change.