2 replies to this topic

[maka]

Hello guys,

 

I just got myself a new smiths electrical temperature gauge and a sensor

 

Before replacing the sensor on my engine head I wanted to make sure of a couple of things :) 

 

First thing that I understood is that on the back of the gauge, I have to plug a 10v cable coming from the stabilizer and the cable coming from the sensor but the thing is I'm not sure which connector is for which cable.

 

The other thing that I'm not sure about is what should happen if I connect my gauge to the 10v and to the sensor which is out of the engine head, and then I turn on the ignition (engine remains off), what should happen ? Should I read on the gauge show max temp or it should adjust to whatever the sensor is feeling as a temperature ? I'asking this because I would like to test the gauge and the sensor before I installing it in the head.

 

 

 

Thank you guys for your help !

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[Cooper Mac]

I've just had a look at the new Smiths temp gauge that I have, but it doesn't say which terminal is which either, but assuming it works by resistance (I'm sure it does, but someone will correct me!) it shouldn't make any difference.

 

To get the gauge to work, you will also need to touch the brass body of the sensor to an earth on the car, as this is needed to complete the electrical circuit.

 

To check the sensor is working, you will need to hold the end of it over a heat source, or against something hot. Run the engine, the hold the sensor onto it to get an earth and heat source!

[Spider]

Inside these gauges, the electrical circuit is basically a heating element, so, they have no polarity. These heaters work by being wound around a Bi-metal Strip. As this strip is heated, it bends and so causes the Needle to move. They are made this way to be slow acting.

 

To test it, connect one terminal to your 10 Volt source, then briefly earth the other terminal, about 2 - 3 seconds will do it and don't leave it earthed. You'll see the Needle move quite quickly.