Polar S120 Heart rate reading becomes erratic or extremely high?, Display is blank or fading?

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...heart rate reading becomes erratic or extremely high?

You may have come within range of strong electromagnetic signals which cause erratic readings. Check your surroundings and move further away from the source of disturbance.

...the display is blank or fading?

If the display is blank, activate the wrist receiver by pressing the OK button twice, after which the Time of Day display appears. If the display is fading, have the batteries checked.

...there are no reactions to any buttons?

Reset the Polar heart rate monitor. Resetting clears watch settings which will return to the default settings.

1.Press the RESET button with a pen tip. Display becomes full of digits. If you don’t press any button after reset within one minute the wrist receiver returns to the Time of Day display.

2.Press any of the buttons once. Time of day is displayed.

...the battery of the wrist receiver must be replaced?

We recommend having all service done by an authorized Polar Service Center. This is especially necessary to ensure the warranty remains valid and is not affected by incorrect repair procedures done by an unauthorized agent. Polar Service will test your wrist receiver for water resistance after battery replacement and make a full periodic check of the complete Polar heart rate monitor.

...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.

2.Check that you have set bike functions on.

...the S150 wrist receiver displays speed and distance readings when I am using it in my wrist?

Turn the speed measurement off. This prevents the receiver from recording incorrect speed signals which may occur due to moisture in your skin.

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Contents S120 S150 Road MAP Contents Exercise Getting Going Polar Heart Rate Monitor PartsFunctions of Buttons SignalReset StopHOW to Wear the Heart Rate Monitor HOW to Measure Heart RateIf Problems Occur Sources of Disturbance S150 Installing the Speed Sensor After Exercising HOW to Take Care Your Heart Rate Monitor Recording Mode Time of Day ModeHeart Rate Measuring Mode Modes and Their FunctionsFile Mode Options ModeSettings Exercise SettingsSetting BasicUse BasicUseExercise Set Setting an Exercise Set If you set Timer 1 on, continue from stepPage HOW to Determine Your Target Heart Rate Zone Function Settings Setting Independent CountDown/CountUp TimerUser Information Settings Setting Your BirthdayMonitor Settings Setting the Maximum Heart Rate HRmaxTurning Activity/button Sound On/Off Selecting Measuring UnitsUnits Watch Settings Setting AlarmTurning Help On/Off Setting Time of Day Setting Date Watch Setting TipsBike Settings S150 Setting Wheel SizeTurning Speed Measurement On/Off Turning AutoStart On/OffHeart Rate Measuring Mode ExerciseS150 Setting Bike Functions On/Off Selecting BasicUse or Exercise SetRecording Mode Functions During ExerciseSwapping the Displayed Exercise Information CountDown/CountUp Timer Storing Lap and Split TimePausing the Exercise Resetting the Trip Distance S150Stopping the Exercise Turning Audible Heart Rate Zone Alarm On/Off Functions only for Exercise SET ExesetSwapping Heart Rate Target Zones Heart-rate-based recovery Recovery CalculationTime-based recovery At the end of recoveryS120 S150Average heart rate of the exercise InZone 1/ Above 1/ Below 1, InZone 2/ Above 2/ Below Additional Feature Connection to ComputerCare and Maintenance Taking Care of Your Polar Heart Rate MonitorService Batteries TransmitterWrist Receiver Precautions Page Heart symbol flashes irregularly? Cannot find the previous exercise’s file?There is no heart rate reading -? Display is blank or fading? Battery of the wrist receiver must be replaced?Heart rate reading becomes erratic or extremely high? There are no reactions to any buttons?Technical Specification Elastic StrapDefault Settings Speed Sensor and AdapterLimit Values Warranty Disclaimer Display Symbols Index

S150, S120 specifications

Polar S120 and S150 are two advanced heart rate monitors designed for fitness enthusiasts and athletes seeking to enhance their training experience. Both devices combine cutting-edge technology and user-friendly features, making them ideal tools for tracking performance and improving health.

The Polar S120 is designed with simplicity and efficiency in mind. It boasts a clear display that makes it easy for users to read their heart rate data in real-time. The S120 tracks heart rate continuously, providing users with insights into their cardiovascular performance during workouts. With a memory capacity for up to 99 training sessions, it allows users to store and review their performance over time, making it easier to assess progress and set future goals.

One standout feature of the S120 is its built-in calorie expenditure calculation, which helps users understand how many calories they are burning during their workouts. This is particularly beneficial for those who are aiming to manage their weight or enhance their fitness levels. The device also features multiple heart rate zones that allow users to tailor their training intensity to meet specific fitness objectives, whether it’s fat burning, improving endurance, or building strength.

On the other hand, the Polar S150 builds on the capabilities of the S120 and introduces additional technological advancements. It offers a more comprehensive training analysis, allowing users to customize their workouts more effectively. The S150 includes advanced features such as interval training support, which lets users perform structured workouts that enhance their speed and endurance.

Moreover, the S150 incorporates the Polar OwnCode technology, which ensures a secure transmission of heart rate data, preventing interference from other heart rate monitors. Both models feature user-replaceable batteries, ensuring longevity and ease of use without the need for frequent replacements.

Durability is a characteristic shared by both the S120 and S150. They are designed to withstand various environmental conditions, making them suitable for outdoor activities. Additionally, they are lightweight and comfortable, so users can wear them for extended periods without discomfort.

In summary, the Polar S120 and S150 are excellent heart rate monitors with distinct features tailored for different user needs. The S120 emphasizes ease of use and fundamental tracking, while the S150 offers enhanced capabilities for more serious athletes looking to optimize their training regimens. Together, they represent Polar's commitment to providing tools that support fitness goals through technology and innovation.