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Operating Manual ECOTROC ATCN 15-110
9.3 Checking the residual oil content
The residual oil content should be measured on a regular basis. Proceed as follows:
1. Check that the indicator pipe is secure.
2. Record the date and time when measurements start.
3. Record the operating pressure (it should be constant during the
measurement).
4. Record the scale value where the obvious red discolouration can al-
ready be seen. (ignore any slight pink-coloured discolouration)
5. Open the needle valve completely.
6. Allow the measurement to run its course until there is a discoloura-
tion of a scale unit of at least 0.2. Use the following tables with the
corresponding measurement pressure to determine the ppm con-
tent for the corresponding measurement time.
7. If your measurement value is within the table values (e.g. 0.5 scale units are discoloured), you can interpo-
late this value.
8. Multiply this value by 1.2 to obtain the residual oil content in mg/m³.
9. Also assess the discolouration rate by recording the values at regular intervals. This provides you with in-
formation about the service life of the active carbon.
10. You can use the test pipe until it is completely discoloured, then replace it.
11. An example at the end of the table clarifies the selection.
12. Close the needle valve again. If more measurements need to be taken, continue to measure from the obvi-
ous red discoloured area.
13. Replace the completely discoloured test pipe when the device is depressurised.
