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D11-044-1: Rapidox 1100ZR-H-OL-LC O
2
Analyser Instruction Manual
D11-044-1
10
Last printed 08/11/2016 12:10:00
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.
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 4 in section 5.10 below.
5.10
Analogue Outputs
The Rapidox analyser provides various analogue outputs. The standard industrial
analogue outputs (0-10V and 4-20mA) for both oxygen, and temperature (or
internal pressure) are accessible via the terminal block (6) on the rear panel.
These outputs have a 12 bit resolution (approximately 1 in 4000) and the lower
and upper values are fully user-programmable using the keypad (2) or the software
provided (section 6). In the case of oxygen, three output mode options are
provided for setting the outputs, in order to give the user maximum flexibility:
1.
LIN (ppm):
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. This setting is more
suitable for medium to high ranges of oxygen, or where the user wishes to
monitor oxygen over a narrow range.