The Vegsensor is set to turn off the relay that controls the Vegtherm at around 90 Celsius (194 Fahrenheit), and back on around 65C/149F (these are approximations, but in that range, which is the range we want the oil to be - the test sensor results were in a somewhat tighter range of ~80C/176 off and ~70C/158F back on, but results will vary).
The Vegsensor is a thermal switch. It is very easy to wire into new or existing installations. You simply cut wire #86, the "trigger" or "signal" wire for the Vegtherm relay ( numbers are marked on bottom of relay) and attach one Vegsensor lead to each end.
Since it's a thermal switch, current will not pass once it reaches the upper end of it's temp. range.
Mounting the Vegsensor on an injector nut using a hose clamp is easy.
Since we want to have oil that is 70-90C area, at the injector, it makes sense to just hose clamp the sensor to the injector. As the cylinder head and injectors and fuel are heated by whatever means, that heat reaches the sensor on the injector. Insulation can be added to shield from ambient cooling effects.
That way, if a person is not looping the return, and is instead using a Hotplate (FPHE) and lots of other coolant based heat, for example, they can run without the loop if they want to (provided fuel delivery and filter restriction from the higher flow rates are not an issue), use all the coolant heat they can, use the Vegtherm to top that up, and have the Vegsensor turning the Vegtherm on and off in that range, as sensed at the injector.
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