Fukuda FL-601 Series, Operational Manual

Page: 44 / 123

43
POWER ON PROCEDURE Connection to External Equipment
OPERATION STAGES ON THE T IME CHART
The Masterless Leak Tester conducts testing through the 8 operation stages described by the standard operation
time chart. The following section explains each operation stage.
(1)
RDY STAGE
The preparation is done and the unit is READY for the test to start.
The input pressure value or the former test result is displayed on the LCD.
(2)
DLY STAGE
The real test start is delayed waiting for the test start signal.
This is used to accommodate things such as the cylinder clamp up/down time.
(3)
CHG 1 STAGE
Lead pressure (higher than the test pressure) is applied. This will allow more stable, accurate leak detection in
a shorter processing time.
(4)
CHG 2 STAGE
Test pressure is applied to the product being tested.
(5)
BAL 1 STAGE
The charge valve is closed and the APV3 valve ( see air pressure circuit on page 115,116) is opened to make the
work pressure and the master tank internal pressure equal.
During this stage, if the work’s internal pressure becomes lower than the reference pressure,
（
lower limit of
internal work pressure
）
it may be judged as a large leak and the test will be terminated.
(6)
BAL 2 STAGE
In this stage, the work’s internal air pressure is stabilized.
During this stage, if the pressure difference between the work and the master becomes larger than the
reference pressure, it may be judged as a large leak and the test will be terminated.
(7)
DET STAGE (F DET STAGE)
The differential pressure sensor detects the pressure difference between the work and the master tank. We
then use this value to calculate the leak amount in the work. (The F. DET stage calculates the fitting
constant). While this stage is being performed if the internal pressure of the work lowers and the differential
pressure is rejected, a large leak judgment is made and the test is terminated.
(8)
EXH STAGE
Exhausts the air within the work. Leak test results are indicated and output.