What is TDN?

Tan Delta Number (TDN) is a value which indicates the overall condition of the oil.

The value range starts high for a new oil and finishes low for an old and worn oil. (Further information on the value range can be found in our master user guide.)

The TDN value range starts high for a new oil and reduces as the oil condition degrades

Any changes to the oil will have an effect on the overall condition and will therefore be picked up by the sensor.

By monitoring this change in TDN value, you can trace the degradation of the oil until it is no longer fit for purpose, using the oil for more of its useable life, in most cases extending the service interval by at least 30%.

Continued monitoring of the sensor data output will also enable you to spot anomalies in the oil behaviour, alerting you to potential issues or breakdown of the asset, so you can pre-empt and prevent a catastrophic failure.

• Related Articles

• What data does the sensor output?

  The sensor reports a number that represents the overall oil condition at that moment in time. This is called "Tan Delta number" (TDN). The sensor reports a number that represents the overall oil condition The sensor also outputs a value for oil ...

• Which communication protocols does the sensor support?

  The sensor is capable of outputting oil condition and oil temperature in both an analog signal and a digital signal as follows: Analog: 4-20mA Installing on systems with a current sensing input Installing on systems with a voltage sensing input ...