motometer capilar temp gauge

deQuincey

deQuincey

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hi

does anyone have experience with this kind of capilar temperature sensors ?

this is an original motometer gauge and sensor and 3m long capilar tube

how do they work ?
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regards
 
Last edited:
capillary temp guage

Yes.

Opposite of electrical impulse/ resistance.

Capillary is direct mechanical. It has a low temp. liquid metal, usually mercury, that grows with temperature and directly moves the guage. Just like an old glass thermometer. Careful with it- they break easily- the tube.
 
61porsche said:
Yes.

Opposite of electrical impulse/ resistance.

Capillary is direct mechanical. It has a low temp. liquid metal, usually mercury, that grows with temperature and directly moves the guage. Just like an old glass thermometer. Careful with it- they break easily- the tube.
Click to expand...

apparently the problem is that it does not work, I have two reasons for this statement:

1- heating the sensor, the needle does not move
2- when I connect the electric poles: (-) to the box, and (+) to the red signal lamp, that lamp is switched on, that means that the critical temp should have been reached

in my opinion the liquid inside the capillar tube is broken, but I don´t know

the sensor has been heated with a air pistol

please advise
 
Capillary guage

Unfortunately, once broken; not possible to repair. Perhaps a specialist could convert to a modern electric mechanism and keep the face of the guage if needed as part of a set ?

I wish I could have been of more help.
 
deQuincey said:
apparently the problem is that it does not work, I have two reasons for this statement:
2- when I connect the electric poles: (-) to the box, and (+) to the red signal lamp, that lamp is switched on, that means that the critical temp should have been reached

please advise
Click to expand...

Hmmm, unless the (+) is meant to be connected to a conventional temp switch. I doubt the instrument knows what the critical temperature is for a given use. It seems like a display device in the form of a needle.
 
Motometer

Most likely 6v as later conversions to 12v was common.

Many VW and Porsches of the 50's used them as accessories. There were later being reproduced in S. America, but your box doesn't indicate that. Usually they were part of a "Rally Pac" with two other guages. They did make guages for small car manufacturers but looked quite different, thermostats, tire guages, etc. Some are collectible now similar to our tool kits in E9s.

Since the warning light came on, it may be the needle mechanism is frozen. As I said though,, they were known to be delicate even back then.

North Hollywood Speedometer here in the US does work on these for the early VW buses. But, legend among those folks has it they didn't make a 12v which resulted in conversions.

Might try a VW shop local to you to see if there is someome near you to repair..
 
Why do you want to use the old mechanical instrument for water temperature (0-120°Celsius, for oil you need 0-150°C) ?!
You can convert all 12 Volt instruments to chrome/white needle-gauges like I did for my gauges holder on the picture underneath !

3erBlendegeblitztr.jpg
 
Orangener said:
Why do you want to use the old mechanical instrument for water temperature (0-120°Celsius, for oil you need 0-150°C) ?!
You can convert all 12 Volt instruments to chrome/white needle-gauges like I did for my gauges holder on the picture underneath !
Click to expand...

reading this answer I think I ought to explain myself a little bit:

I do not trust on the car´s dashboard gauge, because i have an electrical problem that makes me nervous about the accuracy of the meassured temperature value, the question is as follows:

when I start my journey in the car, it starts warming up well, and the gauge in the dash will show an increasing temp value, that is ok, but if you stay there without moving the car, the needle will go up until 2 o´clock, I checked the temp in the engine surfaces with a laser gun and it will be between 72 to 89ºC, so the car is OK, but the needle NOT

this has been driving me mad for months, but suddenly an unexpected thing happened:

I had a high beam problem, due to some electric problem like a bad earth, when I make the horn sound suddenly the high beam lights went on !
after some cleaning and renewing of front cables, and cleaning earth points in the steel, the problem was solved, high beam lights are now ok

so one day, I don´t know why, i push the horn while the car was moving and the temp needle was at 2 o´clock, and....the needle came back to 4 o´clock showing the real temperature and it maintained there for the rest of the trip

now when I started the car the last step before departing is to push the horn !!

I know it should be some kind of electrical problem still underneath, but now I can not check it properly, (I WOULD APPRECIATE IF ANYONE REALISES A CONNECTION BETWEEN HORN AND TEMP GAUGE AND TELLS ME WHERE TO LOOK) (i even have added a new direct earth to the temp clock in the dash with no improvement)

to make a long history short, now I do not trust in the temp gauge, and as I consider that topic a critical item to check if everything goes ok, I would like to install a set of sensors and gauges, so your proposal andy sounds pretty well, I am considering to intall an additonal gauge set of:

- coolant temperature (as a crosscheck)
- oil pressure
- oil temperature
- volts

now maybe you can understand what is beneath all this fuss

the motometer was a present from a friend, and I love the aestetics together with the fact of its accuracy, but if it is broken maybe I will move to fully electric complete set of VDO or... ANY ADVISE ON THE BEST MAKE, AND WHERE TO FIND THEM??

regards
 
A possible slight break

In the wire to the temp guage would do that.

Think of the guage and sender as an OHM meter; they work off of resistance. More resistance means low guage reading. An abnormally high guage reading would mean a lightly loose connection, slight break, or pinched wire which would account for your tapping the horn and something changes at the guage.

Try the switch connections also since the gauges are powered from the run position. You're hitting the horn and jiggling the connection in the column.
 
61porsche said:
In the wire to the temp guage would do that.

Think of the guage and sender as an OHM meter; they work off of resistance. More resistance means low guage reading. An abnormally high guage reading would mean a lightly loose connection, slight break, or pinched wire which would account for your tapping the horn and something changes at the guage.

Try the switch connections also since the gauges are powered from the run position. You're hitting the horn and jiggling the connection in the column.
Click to expand...


hi

thanks for your help

I think I have the solution (but as I checked it only once, I can not say it is done !)

someone wrote: "we should write a book with our mistakes and errors to learn from them", I agree !!

here it comes the solution:

when I mounted the new sender (BERU, instead of VDO), two things changed:

1- the VDO old sender was rated: 6 to 24volts, but the new BERU is rated 6 to 15volts, IS THIS NEGLIGIBLE, NOTHING TO DO WITH THE PROBLEM ??

2- when I fixed it to the tstat housing, I used LOCTITE thread fixing paste :oops::oops::oops:, so after thinking a little bit about the horn tapping changes, I dissasembled the sender, cleaned the thread, and reasemble the old VDO sender,...and.... IT WORKS GREAT !!

I will crosscheck

please advise

regards
 
Temperature sender

Yes, different senders will not match the cars gauge or its abilility to be accurate.

Please use an aluminum sealing washer under the sender and not sealant. It interferes with the senders electrical ground and results in abnormal higher readings.

With thought and determination all things are possible. Congratulations!:)
 
61porsche said:
Yes, different senders will not match the cars gauge or its abilility to be accurate.

Please use an aluminum sealing washer under the sender and not sealant. It interferes with the senders electrical ground and results in abnormal higher readings.

With thought and determination all things are possible. Congratulations!:)
Click to expand...

yes, alu washer has been used

it has been an erratic CSI investigation, fortunately it has not crossed the border of a "forensic" investigation, and so we don´t have a corpse in the garage !:-D

thank you all for your help
 
question on resulting view of temp gauge, HELP !!!

this is my resulting meassure in gauge, isn´t it too cold ?

do you see this value right ?

autside temperature arround 17ºC

jsy444.jpg


v4lzco.jpg
 
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