CLEANING THE SENSOR.
From time to time it may become necessary to clean the face of the sensor. The
sensor can be removed by unscrewing the retaining ring and pulling it out of the
skin fitting. If the boat is in the water be aware that there is no valve in the fitting
and a significant water flow will result. It is essential that the blanking plug should
be at hand, with its O-rings well lubricated, ready to push into the skin fitting.
The face of the sensor should be free from growths, paint, grease, antifouling
etc. An old toothbrush can be used to scrub the surface. If the electrodes show
any signs of damage they can be removed using a 2mm Allen key. Spares are
available from NASA Marine. Take care, when replacing the electrodes, not to get
water in the threads.
After cleaning the sensor, lubricate the O-rings with silicone grease (Taking care
to avoid getting grease on the electrodes.) and re-install the sensor with the
arrow pointing forward.
TECHNICAL SPECIFICATION
NMEA 0183 output sentences VLW+VHW
Supply voltage 12v
Supply current 80mA
Speed Range 0.2 - 40 knots
Transducer cable length 5.0 metres
USING THE TARGET EM LOG.
A brief press on the SPEED key will turn the backlight on or off. A brief press on
the TRIP key will display the trip distance in nautical miles since the EM Log was
turned on. For clarity the units of 100NM are displayed on the lower left corner of
the display. A brief press on the TOTAL key will display the cumulative distance in
nautical miles. Units of 1000NM are displayed in the lower left of the display.
After 20 seconds the display will revert to reading speed, a prolonged press of
the SPEED key will revert immediately to the speed reading display.
SETTING DAMPING LEVEL IN TARGET OR CLIPPER EM LOG
Provision has been made to adjust the display damping in response to different
sea states. There are 9 levels of damping numbered 0 to 8. Level 0 is ideal for
calm conditions and responds quickly to small changes in speed while level 8
averages the speed over a longer period and is therefore slower to respond.
Pressing TRIP and TOTAL together shows the current damping level together
with the symbols TC (Time Constant), press TRIP or TOTAL to increase or
decrease the damping level then press SPEED to store the value and return to
normal operation.
Summary of Contents for EML-2
Page 1: ...ELECTRO MAGNETIC LOG DESIGNED AND MANUFACTURED IN ENGLAND RoHS 2002 95 EC EML 2...
Page 2: ...TARGET EM DISPLAY DRILL TEMPLATE...
Page 10: ...NOTES...
Page 11: ......
