Cambridge Sensotec Rapidox 1100E Oxygen Analyser Instruction Manual
Version 3.8
9
Last printed 29/08/2012 16:01:00
Alarm 2 can be set in exactly the same way as described above and both alarm
circuits are completely independent of each other. Note that you must programme
all the parameters for each alarm for the settings to be saved. The bottom line of
the LCD will display “Alarm x set” (where ‘x’ is the selected alarm channel) to
confirm that the settings have been saved.
The alarm circuit relays are accessed via the terminal block on the rear panel and
are clearly labelled. Alarm 1 is assigned to the terminals labelled “Alarm High”
and Alarm 2 is assigned to the terminals labelled “Alarm Low”. The relay circuit
is rated at 24V 0.5amps maximum.
The alarm limits for oxygen are set to a minimum of -1% and a maximum of
200%. Under certain conditions (e.g. the sensor becomes disconnected) the
Rapidox will set the alarm channel to OFF to prevent false alarms, and the relay
contacts for the affected channel will go to the programmed N/O or N/C setting.
For more information please refer to Table 3 in section 6.8 below.
6.8
Analogue Outputs
The standard industrial analogue outputs (0-10V and 4-20mA) for both oxygen
and pressure are accessible via the terminal block (6) on the rear panel. Note that
the ranges of the 0-10V and 4-20mA are tied together so changing one alters the
other. In the case of oxygen, the outputs are factory set to provide a linear
response in the range 0-100% that will cover most applications. However the
lower and upper values are fully user-programmable using the keypad (2) or the
software provided (section 7). A more details description is given below:
The linear oxygen output mode setting produces an output that is scaled linearly
between 0 and 10V (or 4 and 20mA). So, for example, if the scale is set 0V = 0%
O
2
and 10V = 100% O
2
then 5V would indicate an oxygen reading of 50% O
2
.
The scaling of this example is shown in the following plot, from which other
intermediate values can also be read.
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