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| User Manual
Maintenance and repair of the dryer
KA-MT 10-95/D3
37
Monthly maintenance tasks
Measuring of residual oil content
The dryer is equipped with an oil indicator. The indicator allows for periodic measuring of the
residual oil concentration in the purifi ed air.
It is recommended to measure the residual oil con-
tent every month, using the oil indicator; this allows
the operator to determine the absolute residual oil
content in the air and the available capacity of the
purifying agent.
The measuring principle is as follows: For the du-
ration of the measurement, the needle valve (1) is
opened so that a pressure-reduced partial fl ow of
purifi ed compressed air is fed through the indicator
tube (2). The indicator tube is secured by means of a
union nut (3).
Oil indicator
Any residual oil contained in the air leads to a change of colour of the scale segments of the
tube, whereby a higher concentration leads to more segments being coloured.
The change of colour is irreversible; after completion of the measurement, the indiciator tube
must thus be replaced. It is therefore useful to close the needle valve between measure-
ments.
To measure the residual oil concentration, proceed as described below. A template of the
measuring log used for this procedure is included in the appendix
Risk of damage to eyes! If not properly secured, the indicator tube might be
propelled out of its holder!
When the needle valve is opened, the indicator tube is secured by a union nut.
If
-
the union nut is not properly tightened, or
-
if the oil indicator has been interfered with,
there is a risk that the tube might be propelled by the air fl ow so that it is shot
out of its holder.
When working at the oil indicator, always wear protective goggles.
Prior to opening the needle valve, check that the union nut at the indicator tube
is properly tightened.
Measuring procedure
Prepare measuring log and hold it ready.
Check union nut holding the indicator tube and retighten, if necessary.
At the indicator tube, mark the highest segment with a colour change, using a suitable
pen.
Open needle valve by turning its handle anticlockwise. Write down start date and time of
the measurement.
Leave needle valve open for the desired duration of measurement (e.g. 5 hours).
Subsequently, close the needle valve. Write down end time of measurement.
At the indicator tube, mark the highest segment with a colour change, using a suitable
pen. Write down the number of scale segments that have changed colour since the start of
the measurement.
