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Polar T31 Coded Transmitter

by Polar
| 14 answered questions

RRP: £31.50
Price: £23.95 & FREE Delivery in the UK. Details
You Save: £7.55 (24%)
In stock.
Dispatched from and sold by Amazon. Gift-wrap available.
13 new from £23.95 1 used from £15.57
  • Coded transmitter unit
  • Works with current models except CS600 and RS800 but only eliminates interference (cross-talk) when used with a coded wrist or head unit
  • Set includes sealed coded transmitter and elastic strap(M)

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£23.95 & FREE Delivery in the UK. Details In stock. Dispatched from and sold by Amazon. Gift-wrap available.

Frequently Bought Together

Polar T31 Coded Transmitter + Polar Chest Strap - Spare, S
Price For Both: £37.36

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Product details

  • Product Dimensions: 0.1 x 0.1 x 0.1 cm ; 9 g
  • Boxed-product Weight: 141 g
  • Delivery Destinations: Visit the Delivery Destinations Help page to see where this item can be delivered.
    Find out more about our Delivery Rates and Returns Policy
  • Batteries 1 Lithium ion batteries required. (included)
  • Item model number: 920135
  • ASIN: B000ARDPPU
  • Date first available at Amazon.co.uk: 19 Aug. 2008
  • Average Customer Review: 4.4 out of 5 stars  See all reviews (64 customer reviews)
  • Amazon Bestsellers Rank: 2,484 in Sports & Outdoors (See Top 100 in Sports & Outdoors)
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Product Description

At the heart of your training is the Polar T31 Coded Transmitter Set. Its purpose is simple; to transmit your heart rate to your wrist unit. Slim and light, the ECG (electrocardiogram) accurate transmitter is fully water resistant and designed for all weather conditions. Prevents cross-talk from other electrical devices for accurate measurement of your training. It is built to last with up to 2500 hours of training usage. No user replaceable battery. Fully water resistant.

Customer Questions & Answers

Customer Reviews

4.4 out of 5 stars
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Most Helpful Customer Reviews

54 of 56 people found the following review helpful By John Jamieson on 3 Aug. 2009
This review was amended in January 2013 order to make clear the distinction between the Polar T31 transmitter and the separately available Polar wristband displays.

The T31 is the standard Polar chest band heart rate transmitter. It is also available in a package with Polar wrist band heart rate displays such as the Polar F4, F6, F7 etc.

If you work out in a gym equipped with modern treadmills, cross trainers, steppers, cycle exercisers etc you will find that the machines are all capable of picking up and displaying the heart-rate signals transmitted by the T31. So if you only work out in the gym using modern exercise machines (e.g. Technogym) just buy the T31 at less than half the price of the full transmitter and monitor package. If you later decide to use it for running, cycling or swimming, just add a Polar wrist band monitor.

The T31 is good value for money, in my opinion. Just ensure that the two conductive strips (look like carbon fibre) on the inner face are slightly damp before starting: once you get into the calorie burning zone your perspiration will keep them that way!
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15 of 15 people found the following review helpful By C. Norris on 16 Nov. 2009
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I got this as my T31 strap stopped working with my Polar HRM after about 2 years. I thought I would have to sync or somehow configure the watch to accept the new strap but it started working as soon as I put it on. Neat!

For anyone having problems just remember to wet the hatched areas that go against your skin. I give them a quick lick which does the trick.
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By M. littler on 19 Mar. 2013
Most heart rate monitors seem to be water resistant, which means they dont drown when you go swimming, but it says nothing about whether they work while under water.
I like swimming and this pickup works under water. I wanted a heart rate monitor to help gague how hard I was working. I get sensible values for heart rate while in the water (unlike some others which only work when you take them out of the water). I beleive this is down to the frequency of the radio transmitter, and its relation to water, with high frequency transmitters being blocked by the water.
I have also seen comments suggesting that the heart signal gets shunted by chlorinated water, all I can say is it has never afected my use of this one.
I did read a review that said these can be disloged if you swim very fast. I can confirm that, but I cant swim that fast for more than half a length, and I suspect that tightening the strap might cover that off too.
I think this works with the polar gym equipment as well, as when I was wearing it, the machines in the gym seemed to pick up my heart rate without me holding on.
The one down side that I can see after buying it is that the battery is NOT user replaceable. The assembly is glued together and sealed. these seem to have to be returned to polar for new batteries. (probably just a replacement unit). I havent run mine out of battery yet (four months) so I have not tried getting a replacement yet.
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By D. Jones on 1 Aug. 2013
I bought this HR strap about 3 years ago and have not had any issues with it. I purchased it as a package (along with the RS100 watch) and it works a treat.
As previous reviewers have stated, you must wet the grey patches on the strap in order to get it to work - thereafter, perspiration (if you're working hard enough!) does the trick. It's important to soak the strap in clean water on completion of exercising to remove any sweat and to preserve the strap for prolonged use.
However, the best thing for me is that it works with my Tacx Fortius Turbo Trainer as well, saving me an extra £50 or so for the Tacx OEM version which is an added bonus.
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Verified Purchase
Water resistant belt for polar watches.
You can't actually change the battery after is drain. All you have to do is send it to nearest polar service and they will send you new one, off course you have to pay for it both you will get a discount because you recycle old one.

The is alternative! You can change the battery by your self both it is not that easy job.
You have to cut it the plastic with very sharp knife on the side edge "centre" then you will gain access to the battery. After replacement you have to seal it with the silicon or glue it with melted plastic using the "gun".
Good luck
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5 of 6 people found the following review helpful By Mr. J. J. Coote on 6 May 2010
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Pretty boring item to review but worked absolutely fine with all the cardio machines (Life Fitness) at my gym.
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Verified Purchase
I have used this monitor for a few years, this is a replacement. As a piece of kit I have always been impressed , it is accurate and talks to the gym equipment I use. The one frustration is well-documented; you cannot change the battery, so it is a one-shot item. I don't use it for swimming so attempted to replace the battery as advocated on u tube. This left the old strap looking a mess and ultimately didn't work, hence I resorted to a new strap. In anticipation of the next time it needs replacing I might start looking around for a cheaper alternative now.
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By pk1 on 7 Aug. 2012
Verified Purchase
The Polar T31 Coded Transmitter and extra strap that I also purchased arrived in a box big enough to take 20 of them with space to spare. I bought this for use in the swimming pool and when I first used it the sensor was picked up by my Polar FT7 immediately. I have only used the transmitter twice so far and I have to say that the connection with my FT7 was constant and it provided EXCELLENT data. It is unobtrusive and you forget that you are wearing it.
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