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I. TECHNICAL SPECIFICATIONS
Polar S625X/S725X is designed to indicate the level of physiological strain and
intensity in sports and exercise. It also measures altitude and temperature
in running/cycling. No other use is intended or implied. The altitude and
temperature functions are not designed to be exclusive measuring
equipment in aviation, climbing sports, water sports or their equivalent.
Heart rate is displayed as number of heartbeats per minute (bpm).
Wrist unit
Battery type: CR 2354
Battery life: Average 2 years (2h/ day, 7 days/ week)
Operating temperature: -10 °C to +50 °C/ 14 °F to 122 °F
Water resistance: Water resistant 30 m / 100 feet
Back cover material: Polycarbonate and glass fibre
Wrist strap material: Polyurethane
Wrist strap buckle and two openings on the back cover are stainless steel
complying with EU Directive 94/27/EU and its amendment 1999/C 205/05 on
the release of nickel from products intended to come into direct and
prolonged contact with the skin.
Watch accuracy better than ± 0,5 seconds/ day at +25 °C/ 77 °F temperature.
Polar S625X/S725X is a Class 1 Laser Product.
Accuracy of heart rate measurement: ±1% or ±1 bpm, whichever larger,
definition applies to steady state conditions.
...Check Sensor message appears on the display?
1. Check that you have the right speed settings turned on from the wrist unit.
2. Make sure that the foot pod is turned on.
3. If there is no light on the foot pod you may have exceeded 20 running
hours and the battery of the foot pod needs to be replaced. Check the
Easy start section of this manual for detailed instructions on changing
the battery.
4. If you keep the wrist unit in front of you for longer than 15 seconds the
speed and distance measurements stop. You need to reactivate the
measurements by moving your hand.
5. If you are running on a treadmill and have attached the wrist unit to a
crossbar in front of you, try moving the wrist unit sideways.
Supress the Check Sensor message for the rest of the exercise by pressing
and holding the light button when the message is on the display.
...I have replaced the battery of the foot pod, but the sensor still
does not work?
Please contact your local Polar distributor. Check www.polar.fi for the
contact information of the local Polar distributors.
...the speed reading is 00 or there is no speed reading on the
display while cycling?
1. Check the correct position and distance of the speed sensor with the
spoke magnet and the wrist unit.
2. Check that you have set bike 1 or 2 on.
3. If the 00 reading appears irregularly, this may be due to temporary
electromagnetic interference in your current surroundings.
4. If the 00 reading is constant, you may have exceeded 2500 riding
hours and the battery of the speed sensor needs to be replaced.
5. If you are using the wireless Polar Speed Sensor, check that Power is
turned off in the Options mode.