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Polar T31 Coded Transmitter and Belt Set

4.2 out of 5 stars 276 customer reviews
| 90 answered questions

Price: $40.00 & FREE Shipping on orders over $49. Details
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  • Transmits heart rate data to Polar monitors using 5kHz transmission and compatible gym equipment. Compatible heart rate monitors include, but are not limited to: FT1, FT2, FT4, FT7, FT40, FT60, FT80, RS100, RS300X, RS400, RCX5
  • Individually coded to pick up your heart rate monitor and not others nearby. This eliminates cross-talk with other electronic devices in the same area.
  • Slim, lightweight, and waterproof design
  • Fits 25 to 54 inch chest size
  • Average battery lifetime is 2500 hours of use. Non user replaceable battery
24 new from $37.95 6 used from $18.39

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$40.00 & FREE Shipping on orders over $49. Details In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

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Product Description

Product Description

Transmit your reading easily with the slim and light Heart Rate Transmitter For T31C by Polar, Coded. The handy ECG (electrocardiogram) device features a water resistant design that accurately transmits readings under any weather conditions. Train all you want without worrying about your equipment. This durable transmitter will surely not fail you as it is built to last 2500 hours of continuous usage. Enjoy our 1 year manufacturers warranty and free shipping when you get the Heart Rate Transmitter For T31C by Polar, Coded today!

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Slim, lightweight, and water-resistant, the Polar T31 coded transmitter and belt set accurately transmits your heart rate data to your Polar wrist-top computer. As a result, it's easy to monitor your heart rate during training runs. This version of the T31 coded, meaning it prevents crosstalk from other electronic devices to ensure complete accuracy (Polar also sells a non-coded T31). It's also built to last, with a design that holds up to 2,500 hours of training usage. The transmitter belt--which works with all current Polar wrist-top computers except the CS600 and RS800--includes a sealed transmitter and elastic strap.

About Polar
The first EKG accurate wireless heart rate monitor was invented by Polar back in 1977 as a training tool for the Finnish National Cross Country Ski Team. The concept of "intensity training" by heart rate swept the athletic world in the eighties. By the 1990s, individuals were looking to heart rate monitors not only for performance training needs, but also for achieving everyday fitness goals. Today, the same concept of heart rate training is being used by world-class athletes as well as everyday people trying to lose weight. Polar is the leading brand among consumers, coaches, and personal trainers worldwide and the company is committed to not only producing the best products, but also being the leading educator on the benefits of heart rate based exercise.

Getting Started
Getting started with your T31 Coded Transmitter is easy.  For best results, thoroughly moisten the back electrode areas of the transmitter with water and adjust the strap length to fit snug, but comfortable. Check that the moist electrode areas are firmly against your skin and that the Polar logo is in the upright position. Tip: When you are finished with your workout, remove the transmitter, rinse with water and dry with a soft towel.  Never store the transmitter wet, in a damp environment or in any kind of non-breathable material, such as a plastic bag or sports bag. Sweat and moisture may keep the electrodes wet and the heart rate sensor activated. This will shorten the battery life. Keep in a cool and dry place.

Tip:

When you are finished with your workout, remove the transmitter, rinse with water and dry with a soft towel.  Never store the transmitter wet, in a damp environment or in any kind of non-breathable material, such as a plastic bag or sports bag. Sweat and moisture may keep the electrodes wet and the heart rate sensor activated. This will shorten the battery life. Keep in a cool and dry place.


Product Details

Manual [PDF]
  • Item Weight: 0.3 ounces
  • Shipping Weight: 5 ounces (View shipping rates and policies)
  • Domestic Shipping: Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B000ARDPPU
  • Item model number: 92053125
  • Batteries 1 Lithium ion batteries required. (included)
  • Average Customer Review: 4.2 out of 5 stars  See all reviews (276 customer reviews)
  • Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Verified Purchase
I have owned a polar hrm and transmitter before and love it.I wanted the same quality, so when my polar transmitters battery life was exhaustd, I purchased the same transmitter.NO regrets!!!Polar T31 Coded Transmitter and Belt Set Do not bother sending your polar transmitter to the company after the battery wears out not worth the money--too expensive. You can purchase a new transmitter for half the price.
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Verified Purchase
I purchased this telemetry strap to use while working out at the gym. Almost all the cardio machines at my gym have Polar receivers and can display my heart rate from this transmitter without having to hold on to the physical sensors. This may not seem like a big win, but it's much more comfortable to walk on a treadmill or use an elliptical machine without having to hold on to heart rate sensors.

Using the strap is easy: you just wrap it around your chest, connect the loose end of the strap to the sensor and moisten the contacts. There is no on/off button so you don't have to worry about anything except for putting it on. It is fairly comfortable to wear, and I don't really notice when it is on. The whole thing is made out of plastic and the strap is elastic. The build quality is excellent and it is completely waterproof.

The strap is 'coded' which means that you don't have to worry about interference from other people wearing straps around the gym. This works with the polar wrist-watches, but I have found that the 'coding' doesn't work with the Life Fitness treadmills/elliptical machines or the Precor elliptical machines at my gym. Your mileage may vary, but if the person next to me on the machine is also wearing a telemetry strap, the machine will get confused and vary wildly in its reading. Sometimes it will display my heart rate, and others it will display the person next to me. This is more a problem of the proximity of the machines. If the other person is one machine away, there is no problem with interference. I haven't found this to be a big deal, if I need to I just move one machine over.
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Verified Purchase
I purchased this because I read reviews about the transmitter that ships with my FT40 that said it isn't very reliable in water - loses signal. I wanted to track my heart rate in the pool as well as during my other activities. I've found this transmitter very reliable and comfortable both in and out of the water.
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Verified Purchase
Bought this to be used in chlorinated swimming pool.
Used it in the pool couple of times and works perfectly with Polar FT60 watch.
Love having a heartrate monitor in the pool, it's so much easier than stopping to count the heartbeat.
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Verified Purchase
I was frankly a little concerned that, despite the product description and picture, the item might not include the elastic strap with the transmitter, since Amazon listed the strap as an item frequently purchased with this item. In case anyone else is concerned, yes, it does come with the elastic strap!

The transmitter works well in general, although I've noticed it gives me trouble when running near power lines -- I don't know if anyone has found a way to prevent that yet.
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Verified Purchase
I've been using this strap at the gym with a LifeFitness elliptical and treadmill. When I first used it, it was excellent. I just hopped on the elliptical and started the workout and the strap automatically kicked in and sent information to the machine. I didn't even have to sweat a whole lot. Same thing with the treadmill. Throughout my roughly 1 hour workouts for about 1 week, it worked perfectly.

A few days ago though I started noticing problems with the heart rate reading on the machine. From the usual 158-165 BPM I try to stick to, it all of a sudden goes to like..130 or 140 or even 120 out of nowhere. Since the machines I'm using are basing the strain of the exercise on my inputted target heart rate (160), when there's a sudden drop like that, the whole workout gets all screwed up (the resistance on the elliptical skyrockets, or the incline on the treadmill). Sometimes the reading just flat out shuts off and the machine tells me it needs my heart rate.

I'm pretty sure I've ruled out the possibility of interference, as for that first week when the strap was working just fine, there were sometimes people right next to me with a polar wrist strap on. No interference. On top of that, it's happening when I'm at least 5 machines away from anyone else.

Also, I don't think the problem is with the battery either. Before I made my purchase, I read that the sensors are very sensitive to wetness. Everytime I'm done with the strap, I take it off and dry it well, then place it in a dry area until the next day.

Lastly, if it were a problem with the machine itself then why is it happening on multiple machines, of two different kinds?

I'm compelled to believe that it's a faulty product.
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Verified Purchase
I purchased this heart rate monitor transmitter to replace the one I lost. I use a Polar F6 (A few years older model) and it works flawlessly with it. I'm 6'2" with a 42" chest and this strap fits comfortably with little adjusting. When I'm working out I don't feel it and the slender form factor doesn't show through my clothes when I'm exercising, but I suppose it could if you wore tighter fitting clothing such as those Under Armor shirts or a bicycling shirt.

The transmitter communicates well with the Precor machines at my gym, however I have noticed that it reads about 1 BPM off between my watch & the exercise machine. It's not that big of a deal, it's just something to point out. Using the Polar brand, you're introduced to the OwnZone, which is a custom tailored heart rate range for the day. It's really a great tool to use. I now focus on getting my heartrate into that range as quick as I can and keep it there throughout my workout. Make sure you read the instructions and wet the transmitter areas before you work out. This will help transmitting and if the exercise machine you're on isn't reading properly, I found that moving the band down a 0.5" to 1" will make it start reading normally.

I've heard the big negative to this device is that the battery must be changed by the factory and it's less expensive to replace the entire product. With an approximate 1-3 year battery life, I'll probably purchase another rather than send it in and wait for the turn around.
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