YOKOGAWA EML500 Series, User Manual, Page: 26 / 85

4-1
IM80B80T10E 21th Edition : Jul.1,2007-00
< 4.OPERATION >
4. OPERATION
4.1 Starting and Stopping
4.1.1 Starting

If the sensor is kept in the seawater valve, allow it to protrude from the ship by a specified
length.

Turn on the electromagnetic-log switch on the power distribution board.

Open the master unit cover, and turn on the power supply switch. Now the entire system is
supplied with power and ready to operate.

Adjust the intensity of the light on the master indicator.
4.1.2 Display at Start-up

The master indicator display the speed and total distance traveled.

To reset the trip distance, first press the
DISPL
key. This indicates the trip distance on the
top line of the display and “RESET” on the bottom line of the display . Next, press the
F 1
key to reset the trip distance.

To reset the total distance, press the
CLEAR
,
CLEAR
,
ENT
to the order during the indication
“Speed, Total distance traveled”.

If the
DISPL
key is pressed again in a dual -axis sensor system, the transverse speed ap-
pears on the bottom line of the display. If the
DISPL
key is pressed once more, the resultant
speed and direction appear on the display. That is, the data items on the display change in the
following order each time the
DISPL
key is pressed : speed and distance → trip distance →
transverse speed → resultant speed and direction → return to speed and distance.
4.1.3 Stopping

Turn off the electromagnetic-log switch on the power distribution board. it does not matter if
the power supply switch on the master unit is left on.
NOTE
If this EML500 instrument will not be used for at least three months, pull up the sensor and close
the seawater valve.
CAUTION

Removal of Measurement Rod
� To remove the measurement rod, pull it all the way up and close the seawater valve. Then
remove the rod.
� If the rod is removed before closing the valve, seawater will spew out through the valve.
� To remove the chain, fully close the valve (for the HS, HV, and FA models). Then remove the
chain.