temp gauge drop when termostat is opened

[Konstantin Bogach]

>

I thought that every gauge is to be calibrated to some standard signal (voltage from
sensor, pressure,  etc.).  In case of temp sensors the output signal is voltage. This
voltage for any given temperature depends on type of the sensor (materials it is made of
and physical principles it working on).  Frankly speaking I do not know anything about
types of temp sensors used in cars.   I am just curious how VDO, for example,  gauges are
calibrated?  Or maybe all sensor are standard in car industry?

Konstantin Bogach.
200tq 89

>
> Message: 15
> From: JanDebL at aol.com
> Date: Wed, 15 Nov 2000 23:29:49 EST
> Subject: Re: temp gauge drop when termostat is opened
> To: cobram at juno.com, Konstantin.Bogach at msdw.com
> CC: quattro at audifans.com
>
> I think you are both correct.  If you have a sensitive temp gauge mounted
> close to the radiator inlet, you will see a noticeable temperature decrease
> when the thermostat initially opens and the cold coolant enters the engine.
> The colder the outdoor temperatures, the more noticeable the drop is.  At -
> 40 degrees, a 30 degree drop or more is common.  Once the coolant in the
> radiator is warm, the drop is much less noticeable on successive openings.
> Most factory gauges are not sensitive enough to detect this change - most
> factory gauges are not even graduated - but a good aftermarket Stewart
> Warner, VDO, etc., will provide a more accurate reading.
> Jan Lahtonen
>
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