D11-044-1: Rapidox 1100ZR-H-OL-LC O
2
Analyser Instruction Manual
D11-044-1
5
Last printed 08/11/2016 12:10:00
Allow thirty minutes for the box to stabilise fully. This allows the components of
the analyser to reach a stable working temperature. During this warm-up period it
is common for the baseline oxygen to drift by a small amount, which may be
corrected by re-calibrating (see section 5.7).
5.4
Display Behaviour
Once at temperature the LCD display will show the oxygen reading (in percent or
ppm) on line 1 and the pressure (in mbar, bar, kPa, torr or psi) on line 2. The
symbol AL1 or AL2 may also appear in the bottom right of the LCD if the alarm
system is enabled and an alarm condition applies. The oxygen sensor reading
may flash, show U/Range or O/Range when its limits are reached, and error
messages will be displayed if there is a fault with the sensor. See Table 2 for more
details:
Oxygen Sensor Display Possibilities
O
2
Reading > 9999.9%
Display shows “O/Range”
O
2
Reading >0.5ppm and < 9999.9%
Display shows the normal oxygen reading in % or ppm
O
2
Reading <0.5ppm
Display shows <0.5ppm flashing
O
2
Reading is flashing
Indicates that the pressure sensor is out of range and
automatic pressure correction is on.
O
2
Sensor takes > 10 minutes to warm up
Display shows “Possible sensor Fault” because the sensor
heater is failing.
O
2
Sensor has failed completely or become
disconnected
Display shows “No sensor or sensor Fault”
O2 Sensor is OK but the pressure sensor is faulty and
the auto pressure correction mode is selected
Display shows “Fault” flashing.
Pressure Sensor Possibilities
Pressure Reading is >1000mbar
Display shows “O/Range Press.”
Pressure Reading is >-1000mbar and <1000mbar
Display shows the normal pressure reading in mbar, bar,
kPa, torr or psi
Pressure Reading is <-1000mbar
Display shows “U/Range Press.”
Pressure sensor has failed completely or become
disconnected
Display shows “Fault Press.” With the word “Fault” flashing
Table 2: Different display possibilities depending on the sensor reading.
5.5
Pump Control
The flow rate of gas drawn into the analyser can be controlled using the menu
option 9: “Set Pump Flow”. The unit is supplied with the flow rate set to 100%
which equates to approximately 1.2 Litres per minute. If you wish to change the
flow rate press ENT and select menu option 10. Use the UP & DOWN arrows to
change the value from OFF – 100% in steps of 10% increments. When using the
unit with a pressurised (flowing) gas source the pump can be left switched off.
Note that on units coded “OL” the pump will be deactivated if there is no voltage
signal supplied to the supply valve (In) terminals on the rear panel. Please see
section 5.1 for further details.