AGL_Stream_ST_4MTL_4MSL_E_Rev01
9
Figure 9: Sight glass design
Figure 10: Sight glass reading
For small- and medium-size compressors, as they do not have an oil pump, an oil pressure safety
control cannot be used to protect the compressor against lubrication problems. However, a float level
switch for oil can be used to protect the compressor against oil loss.
2.5.4.1
Oil level management device OM5 TraxOil
Active oil level management is a must in order to ensure reliable compressor operation, in particular
in refrigeration applications with varying operating conditions and defrost cycles. An additional benefit
of active systems is that, in addition to oil balancing, they normally also monitor the oil level and
provide alarm capabilities.
Maintaining proper oil level is of primary importance for a long compressor lifetime.
The OM5 TraxOil uses a Hall effect sensor to measure the oil level. A magnetic float changes its
position according to the oil level. The Hall sensor converts the magnetic field changes into an
equivalent signal, which is used by the internal integrated electronics to evaluate the oil level.
The OM5 TraxOil provides both an oil level
monitoring function and an oil level balancing
function for active oil level management systems,
especially in CO
2
applications.
The OM5 TraxOil has been developed and
specially optimized for CO
2
systems where
maximum working pressures above 60 bar and up
to 130 bar are required.
The OM5 TraxOil is designed to feed oil in
subcritical or transcritical CO
2
compressors when
necessary.
The oil level control is divided into 3 zones: normal,
warning and alarm.
More information about this product can be found
at
2.5.4.2
Oil level monitoring system OW4/OW5 TraxOil
The OW4 and OW5 TraxOil are intended for systems which only require oil level monitoring and
alarming and do not need active oil level balancing.
▪
OW4 is designed for CO
2
subcritical applications
▪
OW5 is designed for CO
2
transcritical applications
Figure 12: OW4/OW5 TraxOil for oil level monitoring
The level control is divided into 3 zones: normal, warning and alarm.
Figure 11: TraxOil OM5 with sight glass & coil
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