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We
can see that this piece of equipment
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Is
fitted with a pressure connector used to connect it to an
installation (by means of a special flexible hose).
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Has
been given two pressure scales (we will use the bar scale)
and a temperature scale. Note that the needle indicates 0
bar since the gauge is open to the atmosphere.
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Is
graduated for refrigerant R22..
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EXERCISE
: before
continuing our study of the fridge engineer's gauges, you should
think about the two following questions:
1°)
Why
does the gauge read 0 bar when it isn’t connected to a fridge system?
2°) Why does the needle indicate –42°C on the temperature
scale when the gauge isn’t connected to a system?
3°) Why is there a temperature scale at all on the refrigeration
engineer’s pressure gauges?
4°) Does the temperature shown by the needle always correspond
to the temperature of the refrigerant?
5°) What is the operating range of this gauge, i.e. what
are the minimum and maximum operating pressures?
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Previous exercise.gif){kind=small}