3606, 3608, 3612 and 3616 Engines and C280-12, C280-16, C280-6 and C280-8 Marine Engines Generator Monitoring System Caterpillar

A RTD measures the change in electrical resistance as a function of temperature. As the temperature increases the resistance increases. As the temperature decreases the resistance decreases. The resistance of an RTD varies linearly with temperature.

Two standard RTD curves are used. One is the European curve which corresponds to 0.00385 ohms/°C. The other curve is the American curve which corresponds to 0.00392 ohms/°C. The GMS uses the European curve for resistance temperature detectors that are engine mounted. The GMS uses the American curve for resistance temperature detectors that are generator mounted.

Resistance temperature detectors come in different elements. The most common resistance temperature detectors are in the following list: Platinum, Nickel and Copper. The most common RTD is Platinum. The Platinum RTD are known as PT100 RTD. The Platinum RTD has a resistance of 100 ohms at 0 °C (32.0 °F). The GMS uses PT100 RTD.

You can measure the lead resistance of a three-wire RTD. The lead resistance is read by measuring the resistance on the sensor. Measure the resistance between the following terminals: Terminal 1 and Terminal 2.

Illustration 1	g00562911

The signal is routed from the engine mounted junction box to terminals in the control panel. The RTD module converts the signal into the parameter.

The signal is used in order to trigger alarms and the signal is used in order to display the parameter.