Operation Manual

Operational procedures

850-165186 / Rev.B

How to calibrate the Depth sensor

Only the Depth sensor can be calibrated. The purpose is to

ensure that the depth reported by the sensor is as accurate as

possible.

This procedure is carried out onboard the vessel.

1 Mount a rope to the top fastening lugs on the sensor.

2 Tighten the rope, and measure one meter from the bottom

of the sensor to a spot on the rope. Place a visual marker

on the rope at that location.

3 Lower the sensor over the side of the vessel and into the

water. Lower i t until the visual marker on the rope is even

with the surface.

4 On the PI54, observe the numerical presentation of the

sensor, and allow the reading to stabilize itself.

5 On the PI54, press t he MENU button to open the Main

menu.

6 Press 4 to open the Setup menu, and 4 againtoopenthe

Sensor alarm/calibration dialogue.

7 Press the GAIN+ button three -3- times to access the

Depth calibration dialogue.

8 Set Depth sensor calibration to YES.

9 Press the ENT button to accept the choice, and one more

time to acknowledge.

10 Observe the information page. Press the ENT button once

again to proceed.

11 Leave the sensor hanging from t he rope for minimum two

minutes. Meanwhile, observe that the numerical

presentation shows grey characters only.

12 On the PI54, observe that the numerical presentation of

the Depth sensor is stable, and shows 1 meter.

13 Retrieve the sensor from the water.

Note: In order to calibrate the sensor, it must be submerged in salt

water.

You may wish to use a different depth reference than the sea

surface. If this is the case, change the marking on the rope to fit

you preference, for example the depth of the keel or the depth of

an echo sounder transducer.