Stupid Trail-tech head temp puter died. Harbor freight meat thermometers are $6. Wow, super close temps between diff bikes when cold. Looking promising.
Gonna wire in a switch between this one and an authentic trail tech gauge with the same sensor.
I'm very curious the results and the variance they have.
And look at this thing. 14mm ring thermocouple.
Looks like you can replace either end. Sweet
I dunno if theyre RTDs or thermistor or thermocouple? meat doohickey might be a thermistor.
There's a buncha different ways to measure temperature, and different chemistry/metallurgy between thermocouple types.
The nice thing with thermocouples is they're linear with temperature. so if you've got a sensor setup for a J type but using a K type thermocouple it'll read an incorrect value, but be off by a fixed percentage that's easy to look up.
And either way if you've got a number that varies with temperature, you can just line it up and figure out what T it reads at say 400F actual.
like even if it said 100 at 400F, most of the time all anyone uses a temp gauge for is an over/under or close to a max of 400F or w/e. if your misreading reader says you're over 100, that's same response to a trailtech hitting 400. the actual number is pretty arbitrary anyway.
Another quick side by side test you can do is check that both read exactly 212 in boiling water or exactly 32 in ice water. as long as theres ice in the water and it's equilibrated, all the water should be exactly 32, same at boiling at 212. NEAT
thanks jbot for ever pushing the envelopes around (edited)
Replaceable battery on the harbor freight thermometer is nice.
And an on off button.
Why run it all the time??
Those 2 pins on the bottom are for the 3v battery.
Looks like you could in theory cut the back of the trail tech out with a dremel, and possibly gut the dead battery, exposing the 2 leads to solder a new battery
One is below the battery so that's the tricky one to get to.
How hard would it be have a fucking battery socket trailtech.
Assholes
So far so good.
Stockish derbi, Trail tech ride to the top of my long hill hit 320, same ride with hf meat thermo 321.
I think it's a keeper
Pretty sweet.
Although harbor freight only goes up to 390 deg? That's kind of a bummer.
https://www.harborfreight.com/instant-read-digital-thermometer-95382.html
Not that I run my bikes that hot. More that Id want to know my temp when I hit seize city.
I've been using that thermocouple for a moped dash project of mine. Been working good for me!
> JBOT Admin Wrote:
> -------------------------------------------------------
> And look at this thing. 14mm ring thermocouple.
>
> Looks like you can replace either end. Sweet
>
Admittedly, I've only tested indoors and not on a bike yet. I'm interested to see how fast it responds being that its made of stainless steel.
The sensor is kinda far from the ring too. Might be good to a/b a TTO
Sooo did some testing on a bike over lunch. The stainless ebay thermocouple gets erratic when the bike is running (reads temps all over the place), but when the bike is off, it acts normal. did some reading and thermocouples work on the tiny tiny voltages dissimilar metals make when heated. makes me think the stainless is conducting some electricity from the spark plug and interfering with my the sensor readings.
im wondering if trailtech is using a fancy metal on the ring that conducts the heat, but not the interfering electricity of the spark plug... just spit balling.
edit: just got off the phone with trailtech. the technical support was really helpful and looked the specifications in the "drawings" he had access to. the ring is just copper. and it is NOT a thermocouple, rather it is a thermistor. (edited)
Try a resistor plug
good idea. ill give that a shot next time in the garage!
> JBOT Admin Wrote:
> -------------------------------------------------------
> Try a resistor plug
I've been doing the same experimenting lately. I have an Amazon chinese gauge, simple black box with backlit lcd, and a k-type thermocouple ring.
It will not read properly off of my bike's electricity. It definitely wants a stable 12v power source. Right now I have an extra battery shoved in my seat bucket (itzaskooter) to power it and that's giving I consistent readings. Next step will be building it scavanging a small 12v rechargeable pack I can tuck into the legshield or something.
I just ordered a two probe handheld temp meter off of Amazon before figuring out that my current gauge wanted cleaner power. My plan was to just run that in a cellphone bracket. I've got multiple bikes though, so it'll get used.
Have you ever tryed to open a tto? Iv also wonder if they use this disc batterys like that harbor fright gauge, could you just replace the battery.
I remember Opening opening ps2 console and replacing those batteries for the internal clock
Have you ever tryed to open a tto? Iv always wondered if they use this disc batterys like that harbor fright gauge, could you just replace the battery in the trail tech
I remember Opening opening ps2 console and replacing those batteries for the internal clock
Yes.
I posted a pic duh.
Battery is in the grey goo, those 2 pins are the batt.
So basically, you can dremel off the back of the case and get access to the battery,
But, you'll have to chop up the battery to get to the negative terminal under the battery in the center. That's where it's tricky
Temp gauges are just a waste of time. Sounds and smells relayed to the pilots senses are what keeps motors turning to the right.
This thread is all witchery.
heres the inside of a broken rpm TTO I took apart to compare. funny they fill one with epoxy and not the other:
> Tyler Dead Possums Wrote:
> -------------------------------------------------------
> heres the inside of a broken rpm TTO I took apart to compare. funny they
> fill one with epoxy and not the other:
>
Okay wow they fill it with epoxy very smart. Makes it unserviceable and probably help make it "waterproof" but you see that disc battery. I bet a lot of people could of saved there tto if they just put in a new Battery (edited)
But then TTO wouldn't sell near as many units . They might not like that . ;)
Next one that dies I'm going to surgically remove the batt thru the back wall. Its impossible to open at the seam without damage to unit
If the two halfs don't go back together just buy a tiny container to contain the unit.
No, when you pull it apart it destroys itself. I tried.
Best bet is cutting thru the back
I've got one somewhere with a broken screen, I'll try to excise a battery from it.
I've got lots of battery soldering experience working on old keyboards and effects where it's easier just to solder one in them buy the special 3v one with the special solder tabs.
When you opened that, was it from the front? I don't see the battery, it's located on the back most likely. You could maybe file away the plastic housing and expose the battery
You can't read I guess.
Good luck and god speed
Is there an advantage of a thermoresister over a thermocouple?
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