G
Guest
Guest
Roman, thought this may be of interest
I have just taken the old HJ60 oil pressure sender unit apart. Have
uploaded pictures to
http://www.paisnel.co.uk/sender
It has a lower contact connected to earth, moved by the brass diaphragm.
Above this is a contact on a bi-metallic strip with a heater wire wrapped
around it. The size of the gap between contacts is adjustable via the white
plastic adjuster. The heating coil is in parallel with an 820 ohm wire
wound resistor. Total resistance of 112 ohm. The voltage feed from the
gauge connects to the resistor and heating coil. Current only flows when
oil pressure is up and the contact is closed, this in turn heats the coil
and pulls the contact open. The greater the oil pressure, the faster the
flashing
I have just taken the old HJ60 oil pressure sender unit apart. Have
uploaded pictures to
http://www.paisnel.co.uk/sender
It has a lower contact connected to earth, moved by the brass diaphragm.
Above this is a contact on a bi-metallic strip with a heater wire wrapped
around it. The size of the gap between contacts is adjustable via the white
plastic adjuster. The heating coil is in parallel with an 820 ohm wire
wound resistor. Total resistance of 112 ohm. The voltage feed from the
gauge connects to the resistor and heating coil. Current only flows when
oil pressure is up and the contact is closed, this in turn heats the coil
and pulls the contact open. The greater the oil pressure, the faster the
flashing