Sensor test procedures
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857-164636 / Rev.A
(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 Spread and Remote sensors on a level surface
with their “transversal eyes” pointing towards each other
at a measured distance (one to three meters). Record this
distance.
3
Place the test hydrophone approximately five meters away
from both the Spread and Remote sensors.
4
Turn on the PI, and record the distance shown on its
display.
5
Multiply the recorded physical distance by a factor of 4.5
and compare it to the distance displayed by the PI.
- The physical distance between the two sensors
multiplied by 4.5 and the displayed distance shown on
the PI should be almost identical.
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 Spread sensor (A) over the side of the vessel
with its head (C) pointing towards the hydrophone. Lower
it to minimum three meters.
4
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.