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TorrL/sec
PaL/sec
Pam
SCF/year
Kg/h R12
g/year R12
The sensor fitted inside the PHD-4 is a helium concentration sensor, the unit of
NOTE
measurement proposed automatically by the PHD-4 is PPM (parts for million).
Use of the flow unit of measurement requires a conversion that takes into
account the flow of gas sampled and the concentration of helium present in the
tracer gas. For this reason, as soon as the unit of measurement has been
selected, the HID automatically opens the tracer gas selection menu (% Helium).
% Helium
The “Tracer gas” selection menu makes it possible to insert a factor
that takes into account the effective quantity of helium present in the
filling gas of the container under test.
Mix value display
The current setting can be displayed selecting the “Display Mix.” item
Mix setting
PPM
%
Through the “Mix setting” item, it is possible to modify the reference
to the concentration used (the factory setting is 100 % He). It takes
into account the actual Helium concentration in tracer gas. The value
can be entered as percentage of helium in nitrogen (%) or as parts of
helium per million parts of nitrogen (PPM).
PHD-4 Portable Helium Detector User Manual
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Technical Information
User Interface
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