
Sensor test procedures
241
857-164636 / Rev.A
(3) = None, one, two or three short flashes: The
number of short flashes signifies the first digit of the
configured channel number.
(4) = A second start flash: This signals that the second
digit of the channel number is next.
(5) = None to nine short flashes: The number of short
flashes signifies the second digit of the configured
channel number.
3
Using a multimeter, check the DC current between the
negative charging lug (A) and the water detector (B).
- With the initial sea water switch and a a fully charged
battery, the current should not exceed 150
µ
A.
- With a redesigned sea water switch (sacrificial bolt)
and a a fully charged battery, the current should not
exceed 67
µ
A.
- If you measure 0
µ
A, check the fuse on your
multimeter.
Testing on land
1
Connect the PI Service Hydrophone to the PI Operator
Unit.
2
Place the sensor on a level surface with its “domed top”
pointing towards the test hydrophone approximately five
meters away.
3
Use the
Status display
on the PI to monitor the sensor’s
signal strength.
- If the interference filter is on, the spectrum displayed
should be relatively flat (approximately 25 dB,
interference filter set at level 9) with a peak detected in
the configured channel.
4
Check that the PI’s displayed temperature corresponds
with the actual ambient temperature.
Testing in water
1
Disconnect the PI Service hydrophone, and reconnect the
vessel’s normal hull mounted hydrophone.
2
Switch off the vessel’s echo sounders, sonars and other
hydroacoustical equipment to avoid interference.
3
Lower the sensor over the side of the vessel.
4
Lower the waterproof thermometer over the side of the
vessel, and keep it as close to the sensor as possible.
5
Switch off the PI system’s interference filter, and observe
the numeric display.
- If the interference symbol is not displayed, leave the
interference filter switched off to increase the system’s
range and performance.
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