Oil Temp & Pressure Sensor/Switch/Transmitter

[Fishcop]

Hi Guys

Since I've finished changing from my sporto to manual, I've found that my temperature gauge is not working. I've now realised that the sporto carried a temp sensor and temp switch and that the manual doesn't...

Okay, so I have these sensors from my 69 engine and my 75(now 73 RS spec) engine, where do they go generally? And what is the difference between the temperature switch and the temperature sensor? Which one sends a signal to the gauge. Also what is the difference between a pressure switch, a pressure transmittor, and a pressure sender?

I have the PET cd, but am having trouble interpreting it.

I have a track day coming up and it is coming into summer here, so a working temperature gauge is essential!

[Fishcop]

...

[randywebb]

pressure switch = on/off

pressure sender = graded analog signal

[autobonrun]

A switch will operate at a set value, say 1 bar. You can either adjust it to operate increasing (high pressure setting) or decreasing (low pressure setting). Typically, there is hysterisis in one direction or the other. If you set a switch to operate in the increasing direction at 1 bar, it may not reset until it gets below 1 bar; say 0.9 bar. A switch typically is used with a light, alarm, or some other on/off function.

A transmitter will give you a representation of the actual value. It can be calibrated to 0-100%, 0- 1000 degF, etc and will indicate all values in between. The sensor is the actual device that measures the variable. For temperature, the sensor is typically a thermocouple or an RTD. A thermocouple's millivolt output changes with temperature. For an RTD, the resistance changes with temperature. Either can be read by a transmitter which converts this value to one that can be read out on either an analog meter or a digital meter. The analog signal out of a transmitter can be either 4-20ma, 0-10 Voltsdc, etc. In both cases, the bottom number typically represents 0 and the top number the full scale reading.

[Fishcop]

Excellent, thank you gents. I think I've got it right now.

[Joe Bob]

If you have an idiot light AND a gauge, you most likely need a dual sender that screws into the oil circuit. It's a larger canister with dual posts. The single post is an idiot light only (On/off) and is a 17mm hex head with plastic facing and a spade connector sticking out....underneath it will tell you what bar rating it is......

[Fishcop]

Thanks Mike. I was confused as the oil senders and switches were in the sportomatic oil circut. Now that I've changed to the manual, these switches and senders are located in different parts of the engine oil circut. Also the sporto oil switch is different to the standard one... I think I've got it sorted now though!