Re: Is it safe ?
- From: Dave22 <dsquier1@xxxxxxxxxxxxx>
- Date: Wed, 12 Mar 2008 17:05:42 -0700 (PDT)
On Mar 12, 7:07 am, mowhoong <mowho...@xxxxxxxxxxx> wrote:
I dismantled a fuel sensor from the petrol tank in my boat.
To my surprise, the sensor made up of a roll of bare resistance wires
in contact with a wiper arm.
This sensor was exposed in the flammable environment, as the
electrical flash will occur between the two contact points. It is very
dangerous to install the sensor in such position.
Do anyone have comment on this ? Thanks
Regards
While at first glance this does look bad, this is the way almost all
of the fuel gauges on cars work.
The obvious kicker is in the operation of the gauge itself. These use
a thermocouple type of action that results in a very low current and
voltage on the sensing wires you are looking at. Thus, due to the
limited voltage and energy applied to the sensors there is no risk of
a spark.
This is also why most gauges are very slow to respond to changes in
the tank level.
Dave 22
Master Electrician and JOAT
.
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