TECHNICAL INFORMATION
22
87-900-120-01 (A)
The self-test cycle also includes a
“Battery test”
which
checks that there is a sufficient residual charge for
operation of the PHD-4 and the
“Sampling test”
which
is useful for checking correct operation of all the
components involved in gas sampling (membrane
pump, sintered filter, glass wool filter, sampling line).
During running of the various tests, the items forming
the list of tests are ticked with a “v” if the test is passed
or combined with the “
!” symbol in the case of
difficulties in running the tests If, in particular
conditions, some of the tests have to be repeated, the
HID highlights this conditions with the “R” (to be
Repeated) symbol combined with an indication of the
test concerned.
The “PS” (Power Supply) symbol is highlighted on the
“Battery test” line if the battery is not present or if the
fuse inside the battery has blown.
At the end of the test, a summary screen page is
shown; if all the tests have been passed, the message
“Self-test performed successfully” is displayed; if some
of the tests have failed, a list of the problems
encountered is displayed for 20 seconds before
automatic shut-down of the PHD-4.
Complete Measurement screen page
The “Measurement screen page” is the operator
interface provided by the HID. At PHD-4 power-on, the
complete measurement screen page is displayed (see
Complete Measurement screen page) with which it is
possible to display the all-round status of the PHD-4.
If the operator does not press any key for more than 5
seconds, the HID automatically changes data display
mode activating the Large size screen page (see Large
size screen).
The measurement screen page makes it possible to
monitor the main operating parameters of the PHD-4,
the status of the digital interface and obviously the leak
rate measured, in real time.
The leak rate is displayed in the form of a bar whose
length is proportional to the leak rate and also by a
numeric indication in exponential format followed by the
related unit of measurement.
A set of variously positioned icons highlights activation
and status of the most important functions of the
PHD-4.
Icon
Function
Automatic zero activated
Fixed zero activated
Low sensitivity activated
High sensitivity activated
Set-point activated
The functions of the 4 soft-keys during the operating
phases (measurement screen page ) are as follows:
•
Key 1: (ZERO)
Fixed /automatic zero
•
Key 2:
Backlight ON/OFF
•
Key 3: (OFF)
PHD-4 OFF
•
Key 4: (MENU)
Link to the “Desktop menu”
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