Aquaread BlackBox™ Instruction Manual
10401-00618 Rev P
Note 1:
The two 4-20mA current loop outputs are completely isolated from each other and
from the rest of the BlackBox circuitry. Whilst the cores assigned to the two current loops
are designated as supply and return respectively, they are, in fact, bi-polar and can be
connected either way round.
Note 2:
the BlackBox must have its normal power supply connected and the on/off switch
line (white core) taken high in order for the current loop outputs to work. The current loop
outputs operate independently from the digital output which can be used simultaneously if
required.
Note 3:
In this configuration, power should be left on the BlackBox continuously.
If the controller has a switched output to control external devices, this can be connected to
the white core (on/off switch line) and can be pulled to ground to put the BlackBox into
sleep mode if power saving is required.
If the BlackBox is put into sleep mode, then the white core is subsequently taken above 6V,
the BlackBox will re-enter normal running mode but
the 4-20mA loops will not be stable
and valid for 40 seconds
.
If an AP-7000 is connected,
the 4-20mA loops will not be stable and valid for 60
seconds
after leaving sleep mode.
If the BlackBox is running software revision 2.05 or below and an AP-7000 is connected, a
self clean command will be sent to the Probe each time it is woken up.
If the BlackBox is running software revision 3.00 and above and an AP-7000 is connected,
a self clean command is not sent on each wake-up. Software revision 3.00 and above
sends a self clean command every six hours, regardless of the mode selected. For this
reason, power should be left applied to the BlackBox at all times. If a low power mode is
required between readings, use the on/off (sleep) line.
2.1 Important Information Regarding the Power Supply.
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