This lightweight and robust sensor measures the cylinder head temperature in small engines and is particularly intended for the UAV industry. The sensor is based on the KTY84 silicon resistive element chip. These sensors have a positive temperature coefficient of resistance with a typical resistance of 580 ohms at 20°C and 2600 ohms at 300°C. (Note : Standard probe is rated to 220°C only, 300°C available on special request).Mounting: Mounting of the CHT sensor is via an M5 blind hole tapped into the cylinder head at a convenient place close to the combustion chamber (but not breaking through into the chamber). The hole should have a minimum of 4.5 mm length of full thread.
Circuit: For correct operation at higher temperatures (>150°C) the sensor must be provided with a bias current. This can be provided via a pull-up resistor. If used with a Currawong ECU the correct bias current will be supplied automatically. (For details refer to the Currawong document “CHT Installation.doc”).
- Temperature range: -40°C to +220°C
- Extended temperature range version (-40°C to +300°C) available on special request.
- Cylinder head fitting: M5 x 0.8 mm thread, 4.5 mm long to the shoulder of the fitting.
- Connector: Omnetics 5 pin , with the sensor connected between pin 1 (earth) and pin 4.
- Sleeving: High temperature translucent teflon sleeve, diameter 3.8mm
- Overall Length: 127mm (5 inches), or a length to customer requirements.
- Weight (with all fittings): 5 grams (0.17 ounces).
Alternative lengths and connector types are available to meet the requirements of most engine installations.