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Oil pressure sender



I was wondering the same, but after looking at the whole thing again, not
so sure.
I do think the pulse rate is determined by pressure rather than oil pulses
produced by the oil pump. The frequency is determined by the initial gap
setting of the sender contacts, the rate of heating of the wire, and the
bending/return speed of the bi-metallic strip
I have only carried out the flashing light test on the old sender, not on
the new one......yet...but I will wait to see how the new gauge performs
before playing around with the new unit.
I think what is happening is this. We know that as pressure increases, so
the number of pulses per minute increase. Assuming the current is staying
constant in the system during the time the contact is closed, and for any
given period, it is closed for a longer total period of time when there are
more pulses (higher pressure). Therefore greater wattage being drawn
through the resistance/heating wire in the gauge itself. More wattage,
greater heating, greater deflection of the bi-metal strip and therefore
movement of the needle.
On 6/5/05, Neil Paisnel <[Email address removed]> wrote:
Hello Neil,
Pulse rate determined by pressure? How is pressure translated into
movement closing the contacts? If the membrane causes the contacts to
close under pressure, it can't close it less or more. It's either ON
or OFF.
OK, it's all too complicated for such a simple gizmo. When I have a
moment I'll hook up a scope to the sender and we'll get a better
Roman (London, UK)
'92 HDJ80