mcmurdo E3 Bedienungsanleitung
406 MHz
Satellite
OWNERS MANUAL
sos 3
4
22
11
5
1
1. PURPOSE
An Emergency Position Indicating Radio Beacon (EPIRB) is used to alert search
and rescue services in the event of an emergency. It does this by transmitting a
coded message on the 406 MHz distress frequency. This message is relayed via
satellite and earth station to the nearest rescue co-ordination centre.
The McMurdo E3 works with the Cospas-Sarsat polar orbiting satellite system which
provides true global coverage. The system has an alert delay of typically 45 minutes
dependant on when the satellites come into view on the horizon.
The satellite can determine the position of your E3 to within 5km (3 miles) and the
coded message identifies the exact vessel to which the E3 was registered. This
information allows the rescue services to eliminate false alerts and launch an
appropriate rescue.
The E3 also has a secondary distress transmitter. This transmits on 121.5 MHz and
is used for “homing” purposes. When the rescue services get close, this allows
them to direction find on the signal. To cater for searches at night, the E3 has a
bright flashing light that aids final visual location.
S
E
A
L
READY
TEST
PRESS TO
Antenna
Strobe
Red lamp
Program point
Sea contacts
Lanyard
ON button
under here
READY
button
Battery expiry date
2
2. DESCRIPTION
The E3 is a powerful self-contained distress transmitter. It is powered by a light
weight Lithium battery that has a replacement interval of 5 years. An EPIRB is
intended to be a one-shot device, once activated it can operate for 48 hours. It
operates best while floating in water, but it can also be operated while onboard.
Refering to the previous figure, the key components of your E3 are as follows.
Antenna This is a flexible whip. It must be near vertical when operating.
If the antenna gets bent, gently straighten it out.
Strobe light This is the glass U-tube visible through the clear lens dome.
When the E3 is activated this will flash every few seconds.
Red lamp Visible through the clear lens dome at the rear of the E3.
This stays on or flashes to show you which mode you are in.
Program point A dimple in the clear dome, through which your supplier can
optically input the coded message unique to your E3.
You must register the coded message with local authorities.
READY button Press this key once to de-activate the E3. Hold it down to
run the built-in self-test, which checks basic operation.
ON button Press this key to manually activate the E3. The key is protected
by a sliding door, which is fitted with a tamper seal.
Sea switch The two screw heads below the keys are sea switch contacts.
Submerge these in water to automatically activate the E3.
Lanyard Pull the lanyard spool down to free it. Use the cord to tether the
E3 to a survival craft. Never tie the E3 to your vessel.
2.1 Wall bracket
If you purchased the manually activated version (E3m), this is normally supplied
with a wall mounting bracket (see section 6). The bracket is made from white plastic
so it will not rust. Its top section is sprung loaded, so that one simple squeeze will
quickly release the E3 allowing it to be carried to a liferaft. The wall bracket should
be sited in plain view near an emergency exit. This bracket is more than just a
stowage point, it contains a magnet which disarms the E3’s sea switch. If you do not
stow the E3 in its bracket, there is a risk of the E3 activating if it gets wet.
2.2 Float-free enclosure
If you purchased the automatically activated version (E3a), also known as the “float-
free” version, then your E3 is supplied in a plastic enclosure (see section 7). This is
much more than just a protective housing, it contains a sprung loaded lever which
automatically pushes the enclosure lid off and releases the E3 if your vessel sinks.
This automatic ejection is controlled by a device called a Hydrostatic Release Unit
(HRU). If the enclosure is submerged then before it reaches 4 metres (13 feet) deep
3
the HRU cuts a plastic rod that holds back the spring and the lid is ejected,
releasing the EPIRB which floats to the surface and switches on automatically.
The diagram below illustrates the automatic release sequence.
1) As the vessel sinks, the enclosure fills with water. The HRU contains a blade
which is released due to water pressure acting on a diaphragm. Before it
reaches a depth of 4 metres, the HRU will operate and cut the plastic rod,
releasing the coil spring.
2) The spring pushes the E3 and the enclosure lid outwards. As the lid pivots off
it disengages from the screw head that helped hold it in place. The lid is
weighted so it rolls over and falls away.
3) As the E3 floats away from the lid, it moves out of range of the magnet. Once
away from the magnet its sea switch becomes armed.
4) The sea switch activates. The EPIRB then floats on the surface with its strobe
light flashing. After 50 seconds it makes its first distress transmission.
If you need to manually activate your E3, it can be freed from the enclosure simply
by pulling out the R-shaped retaining pin and removing the lid.
2.3 Manual E3 in enclosure
Customers who need to mount their E3 in an exposed position can select the
protective enclosure without an HRU fitted (E3c). This means that the E3 will not
float free if your vessel sinks. This is known as a category 2 EPIRB. You can tell
which enclosure you have by reading the category from the front of the enclosure…
E3a Category 1 HRU fitted Automatic float-free
E3c Category 2 No HRU fitted Will not float free
H
R
U
1) HRU cuts rod
2) Lid ejects
4) sea switch
activates
3) EPIRB arms once
away from magnet
Magnet
4
READY
HOLD TO
TEST
ON
3. CONTROLS
3.1 ON button
This is hidden behind a sliding door, which protects it from accidental activation.
The sliding door has a tamper seal to show if the E3 has been activated before.
The E3 can be manually activated by sliding the door to the left (breaking the seal)
and then momentarily pressing the ON button.
When activated the E3 will start to flash immediately. It will not make any distress
transmissions for the first 50 seconds. This gives you a chance to turn it off, if you
activated it accidentally. During the first 50 seconds the red lamp comes on
continuously. When the red lamp starts to flash, the 50 seconds is over and distress
transmissions have started.
3.2 READY button
This button can de-activate the E3 and it can test the E3.
Ready Pressing and releasing this button quickly will de-activate the E3 and
return it to its “ready” state. When the button is released the strobe and
the red lamp will stop flashing.
Self-test Pressing and holding the ready button (for about 10 seconds) will allow
the built-in self-test to run. When the button is held down the red lamp
will come on for 4 seconds, then go off. During this time both the
121.5MHz homer and the 406MHz satellite transmitter make “safe”
transmissions. If both of these test transmissions arrive at the antenna
with sufficient power then the strobe light will flash 3 times to tell you
that all is well. If the strobe light does not flash within 10 seconds then
there is a fault and the ready button can be released.
3.3 Sea switch
It is important to realise that the only time the E3 is completely off is when it is fitted
in its mounting bracket. As soon as you take it out of its bracket a magnetic switch
activates and puts the E3 into its “ready” state. It will not drain the battery in this
state, but it will turn on automatically if the sea switch contacts are bridged by water.
The sea contacts are the two exposed screw heads beside the rear switches.
Although you can manually control the E3 with the READY and ON switches, the
sea switch overrides any manual settings. For the manual switches to operate
properly the E3 must first be dry so that the sea switch is de-activated.
To ensure the sea switch operates properly in rough seas, it has a built-in time
delay. It has to be wet for at least 2 seconds before it will activate and it has to be
dry for at least 8 seconds before it will de-activate.
5
Squeeze top until
it springs up
1
2
Lift up to
free base
3
4
Pull
forward
Pull
down
4. OPERATING PROCEDURE
An EPIRB is a piece of life saving equipment. Its sole purpose is to call for help.
It must only be used in situations of grave and imminent danger.
Misuse can involve a severe penalty.
4.1 Sinking
If you have a category 1 “float-free” enclosure (see marking on enclosure label),
then if your vessel sinks, the E3 will automatically release itself from its enclosure
before it reaches a depth of 4 metres. The E3 will float to the surface and start to
operate because its sea switch is activated.
If possible, the E3 should be recovered and
tied (using its lanyard) to one of the liferafts.
An EPIRB is meant to mark survivors, not the
accident scene. For best operation leave the
E3 floating in the sea near the liferaft.
4.2 Abandon ship
If the vessel is sinking and there is time to fetch the EPIRB then this should always
be done. Release the E3 from its mounting bracket as described in section 4.3 or
4.4 and carry it to one of the liferafts. Once the liferaft is in the water, uncoil the
lanyard and tie it to the liferaft, then throw the E3 overboard so that it floats next to
the liferaft. The E3 will operate because its sea switch will activate.
4.3 Releasing E3 from a wall bracket
If you have an E3 fitted into a wall bracket then follow the instructions below to
release it from the bracket…
6
4.4 Releasing E3 from an enclosure
If your E3 is fitted inside a full enclosure then follow the instructions below to
manually release it from its enclosure…
4.5 Manual activation
If the vessel is not sinking, but there is imminent danger, then remove the E3 from
its bracket and manually activate it as shown below. Note that once activated it will
flash immediately, but it will not transmit a distress call for 50 seconds. This gives
you a chance to turn it off, if you activated it in error.
Once activated the E3 must have its antenna near upright and it must have a clear
view of the sky for proper operation. Lying it on its side or placing it next to a metal
wall will impair its range and may fail to alert the rescue services. Avoid handling the
antenna, as this will also impair performance.
2
1
Pull R-clip
from pin
Pull
cover
off
3Pull EPIRB
towards you
1
2
3
switches
Locate
on rear
Press ON button
4
EPIRB
will flash
Slide cover to left
Breaking tamper seal
7
1
2
Slide cover to right
Press READY button
READY
HOLD TO
TEST
1Insert
antenna
2
3
Push
backwards
Push firmly
into cup
Push down
until clip locks
4
4.6 De-activation
If the E3 was activated by mistake or if the emergency ends then the E3 can be
reset back to its “ready” state as follows…
•Remove EPIRB from any water
and dry its sea switch contacts.
Wait 8 seconds for sea switch to turn off.
If EPIRB is still flashing then it must have
been turned on manually…
•Slide the switch cover fully to the right.
•Press and release READY button.
If EPIRB is still flashing then it has a fault.
Refer to section 5 on “False alarms”.
4.7 Battery condition
If your E3 has been activated for a cumulative period in excess of 2 hours then its
battery will need replacing. This is necessary to ensure that the next time it gets
used it will operate for the full 48 hours required by government regulations. See
section 9.3 for battery replacement instructions.
4.8 Re-fitting E3 into wall bracket
The E3 is now in its “ready” state, but its sea switch is still armed and will activate if
it gets wet. To fully de-activate the E3 it must be returned to its mounting bracket,
where a magnet hidden in the bracket will make the E3 safe. Follow the appropriate
instructions below…
8
4.9 Re-fitting E3 into enclosure
•Offer E3 into backplate with switches facing outwards.
•Engage base of E3 into D shaped metal prongs.
•Antenna rests either to left or right of release pin.
•Check E3 is fully engaged in metal prongs and resting on foam pad.
•Refit cover by first locating release pin through hole in cover.
•Locate cover onto backplate, then snap down over locating lug.
•Refit R-clip through hole in end of release pin.
3
Fit cover
over pin
4Snap cover onto
locating lug
5
Fit R-clip
through pin
1
2
Switches
facing
out
Slide D-shaped
foot into prongs
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