TANDELTA OQSExISG2, User Manual

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5.5 Traffic Lights
First and foremost, the TDN scale offers a ‘traffic light’ view of oil quality . There is a Green
section, an Amber section and a Red section to illustrate OK, Warning and Alarm conditions
respectively. The thresholds for these sections can be user-defined for any application. Factors
such as likelihood/nature of contamination, how crit
ical the machinery is and manufacturers’
guidelines should all be considered when setting the thresholds. Please contact your distributor
or support@tandeltasystems.com for further guidance on setting your warning/alarm levels.
5.6 Numbering/Levels
The TDN scale extends from 1200 down to 0. For most applications, the ‘green’ section
includes all values from 1050 to 420. ‘Amber’ (warning) will go from 400 to 300: this is the
point at which you need to monitor the quality closely and prepare to filter or change the oil.
The ‘red’ (alarm) section applies to values of 300 and below. At this point, the oil needs to be
changed as it is no longer providing sufficient lubrication.
5.7 Clean Point (Start Point)
The starting point for a new oil is called the Clean Point. For most oils, this will generally be
between 950 and 850 on the TDN scale. The actual value will depend on a number of factors
but most importantly how pure the base stock is and what additive packages have been
included.
Figure 3- Example of Oil Quality Warnings & Alarms
As the oil begins to deteriorate the value will decrease.
NOTE: TDN does not start at 1000 for a new, clean oil, as some oils can be improved by
using sophisticated on-line or off-line filtration. Oil can also improve on the TDN scale, as
well as deteriorate.
TDN Oil Quality
--- Sensor in air / no oil detected Alarm (HIGH)
Warning (HIGH)
--- New
--- Good
--- Worn Warning (LOW)
--- Severely worn Alarm (LOW)
--- End of life
1200
1100
500
250
0