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Cambridge Sensotec Rapidox 1100ZR-H-OL O
2
Analyser Instruction Manual
Version 1.2
10
Last printed 22/07/2015 18:02:00
ENT to proceed. The default is O
2
.
The next settings configure the behaviour of the alarm. Use the UP & DOWN
arrows to select ON or OFF for the following parameters:
1.
OUTPUTS:
This enables the rear panel relay outputs when ON is selected
2.
AUDIBLE:
This enables or disables the audible buzzer inside the unit
which will sound in an alarm condition
3.
VISIBLE:
This enables or disables warning messages on the LCD screen on
the front of the Rapidox. During an alarm condition either “AL1” or “AL2”
(or a combination of both) will flash at the bottom right hand corner of the
display.
4.
POLARITY:
This determines whether you are setting a rising or falling
alarm. Use the arrows to change the direction of the alarm to up or down.
A rising alarm means that the alarm will be silent at values below the set-
point but as soon as the value rises above the set-point the alarm will be
triggered
5.
SETPOINT:
The current alarm set-point is displayed in scientific notation
with a flashing cursor under the first digit. Use the UP & DOWN arrows to
change the digit and the RIGHT arrow to progress until the correct value is
displayed. When done, press ENT to proceed to the next setting.
6.
CONTACTS:
The relay outputs can be set to either normally open (N/O) or
normally closed (N/C). The factory default is N/O, meaning the contacts
will close when an alarm condition occurs. Press ENT to save all the above
settings for the selected alarm.
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.
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 7.10 below.