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(4) Check of operations of alarm LEDs and output relay (Check every six months.)
1) Check the operations of the alarm output relay according to 11.5 [Alarm operation check.]
In the test mode, you can check the indications of the mist indicator LEDs and the operations upon
occurrence of PRE ALARM and HIGH ALARM.
2) Since noise, etc. can activate the HIGH ALARM function. To prevent such an alarm activation error,
the HIGH ALARM function will be activated after confirmation and then held.
(5) Check of operations of “SYSTEM FAILURE” LED and output relay (Check when necessary.)
It is unnecessary to check the operations of these devices during normal handling. If the external output
must be checked, its operation can be checked by simulating a nonconforming state as stated below.
1) Turn off the power switch in the controller, and temporarily disconnect the input wire on one side of
the communication line to a sensor unit (No. 4 of terminal block CN203: TRX-).
2) Turn on the power switch, and a “System failure” will occur.
3) The “SYSTEM FAILURE” LED will light, and the output relay will function.
The mist indicator LED Nos. 10 to 12 will flash to indicate the system failure status.
4) The output relay is held. It can be restored by turning off power.
Turn off the power switch, and reconnect the disconnected wire correctly to restore the relay.
(6) Other check and maintenance
1) The service life of sensor units and controller depends on working conditions and environment
(temperature and humidity). To obtain stable output, it is recommended to ask manufacturer’s
inspection every eight (8) years, and please replace the new sensors if the engineer recommends to
replace the sensors due to deterioration.
2) If a sensor unit is used for 3 years or more, clean the unit using the cleaning agent specified by
Daihatsu, and then check the alarming operation of the sensor unit using a smoke tester.
3) The power switch shall be kept on to keep them in working state.
4) Watch out for the places where the sensor units and the controller are stored. If they are stored for a
long term or during construction period, put vinyl sheets, or the like, over them to protect them from
water, dust, and dirt.
Note)
When use of the MD-SX oil mist detecting system becomes it over eight years, you should ask
DAIHATSU for system operation check and maintenance by Daihatsu engineer.
Original content from www.daihatsu.cc
Issued to HORIZON TANKERS LIMITED S.A.
