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Thread: Tyre pressure sensors

  1. #17
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  2. #18
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    Am going to repalce batteries when tyres changed. If they don't wake up I can deal with that whenever i have time

    I have two questions I would be interested in hearing people's views on (if they know)

    1. Silicone: I think non-acetoxy silicone is what is needed to avoid possibility of corrosion of electrical contacts. Any neutral cure should work. Any reason not to use cheap one eg https://www.toolstation.com/everbuil...5-380ml/p85598

    2. Battery: reading through Nicholas Van den Berg's doc on how to do the replacement, he does not discuss soldering the negative battery terminal. I assume contact is maintained through centrifugal force. Bendy Toy, your short wire suggestion is just a way of connecting negative to the sensor tab, presumably with the wire being folded under the battery before it is siliconed? Have people had issues not soldering the negative connection?

    Cheers

  3. #19
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    Had no issues not soldering the Negative.
    I would recommend using the batteries with tags spot welded to them as heat soldering directly to the case does not do the battery any flavors.
    The big advantage of using the cheap wake up tool is you do not have to fit the sensor to check it is working with the new battery. Obviously it wont show any pressure but will show that it is working and linked to the ECU.
    Never had any luck with waking up the sensors by rapid deflation, deflation over 10 seconds, bouncing the wheel on the floor or kicking the tyres, but the wake up tool works a treat.
    If you clear the code for a sensor in the ECU, then when you wake up a new sensor with the tool it automatically writes the code for the new sensor to the ECU which is very handy.

  4. #20
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    Thanks, that makes sense for sure

    Any views re silicone?

  5. #21
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    all the force when riding is to throw the battery into the casing ….not against hot melt glue or other sealant you used

  6. #22
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    Not sure I follow. Question is about corrosion from acetoxy silicones that are not spec-ed for use on electrical components. I read your answer as implying that anything can be used, but that is not the case

  7. #23
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    thought u meant for strength, video I've seen says to use hotmelt glue.... its a BMW electrics are designed to fail to an intensively researched and engineered timeline... they will die when BM wanted not because of the silicone you used

  8. #24
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    Quote Originally Posted by botus View Post
    thought u meant for strength, video I've seen say to use hotmelt glue.... its a BMW electrics are designed to fail to an intensively researched and engineered timeline... they will die when BM wanted not because of the silicone you used
    Thanks for responding. My question above is clear. I don't agree with your final comment - the idea that silicone can have zero effect, I'm afraid, makes no sense - conductive silicones, for example, could short the battery, and corrosive ones could corrode the contacts. I think one needs to be careful about posting comments of that type as others may take them literally and as authoritative, and yours cannot be taken as such

  9. #25
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    If it helps I have used a hot melt glue gun in the past with no problems and the glue does not retain enough heat to upset the battery.
    The battery can be held in place with a spike whilst it quickly sets.
    If using a RTV sealant I would use Wurth RTV.
    To be 100% safe use a purpose designed potting compound from RS components.

  10. #26
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    Quote Originally Posted by Mistacat View Post
    If it helps I have used a hot melt glue gun in the past with no problems and the glue does not retain enough heat to upset the battery.
    The battery can be held in place with a spike whilst it quickly sets.
    If using a RTV sealant I would use Wurth RTV.
    To be 100% safe use a purpose designed potting compound from RS components.
    Thanks. The RS neutral cure silicone info sheet says that it does not have good adhesion to plastic and I am not certain what the pressure sensor housing is made out of, so I discounted that product. The Everbuild from Toolstation says it has good adhesion to most materials including plastics.

    Hot glue makes sense to me for that reason - it will have great adhesion, and also is non-conductive / corrosive.

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