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The Polar running computer should not be used for obtaining environmental measurements that
require professional or industrial precision. Furthermore, the device should not be used to obtain
measurements when engaged in airborne or underwater activities.
Water resistance of Polar products is tested according to International Standard ISO 2281. Products
are divided into three different categories according to their water resistance. Check the back of your
Polar product for the water resistance category, and compare it to the chart below. Please note that
these definitions do not necessarily apply to products of other manufacturers.
Marking on case back
Wash
splashes,
sweat,
raindrops
etc.
Bathing
and
swimming
Skin
diving
with
snorkel
(no air
tanks)
SCUBA
diving
(with air
tanks)
Water resistant
characteristics
Water resistant
x Splashes,
raindrops etc.
Water resistant 50m
x x Minimum for
bathing and
swimming*.
Water resistant 100m
x x x For frequent use
in water but not
SCUBA diving.
*These characteristics also apply to Polar WearLink 31 and Polar WearLink W.I.N.D. transmitters
marked Water resistant 30m.
Frequently Asked Questions
What should I do if...
...the battery symbol and Battery low is displayed?
The low battery indicator is usually the first sign of an expired battery. However, in cold conditions the
low battery indicator may appear. The indicator will disappear as soon as you return to a normal
temperature. When the symbol appears, the running computer sounds and backlight are automatically
deactivated. For further information on changing the battery, see Care and Maintenance.
...I do not know where I am in the menu?
Press and hold STOP until the time of day is displayed.
...there are no reactions to any buttons?
Reset the running computer by pressing all the buttons simultaneously for two seconds until the
display fills with digits. Press any button and set the time and date in Basic Settings after the reset.
All other settings are saved. Skip the rest of the settings by pressing and holding STOP.
...the heart rate reading becomes erratic, extremely high or shows nil (00)?
•
Make sure the running computer is no further than 1 m / 3 ft from the transmitter.
•
Make sure the transmitter belt has not loosened during exercise.
•
Make sure the textile electrodes in the sports apparel fit snugly.
•
Make sure that the electrodes of the transmitter / sports apparel are moistened.
•
Make sure the transmitter / sports apparel is clean.
•
Make sure that there is no other heart rate transmitter within 1 m / 3 ft.
•
Strong electromagnetic signals can cause erratic readings. For further information, see Precautions.
•
If the erratic heart rate reading continues despite moving away from the source of disturbance, slow
down your speed and check your pulse manually. If you feel it corresponds to the high reading on
the display, you may be experiencing cardiac arrhythmia. Most cases of arrhythmia are not serious,
but consult your doctor nevertheless.
Polar RS400 User Manual 45