Not on a Focus or late Mondeo Blacktop Zetec engine it isn't tabetha (except the ST170 engine).

The 'thermistor' sensor is a probe about 5cm long. Its screwed into a dry pocket from the inlet manifold face above cylinder #1. Hence CHT.

At operating temperature, CH temperature is 10-15 degrees higher than coolant temperature. Also if you measure the voltage across the thermistor, you have to allow for the EEC-V PCM changing the bias resistor as temperature reaches ~90 degrees (IIRC).

Martin