132
11 Reference
11
1
1
L
L
e
e
a
a
k
k
T
T
e
e
s
s
t
t
i
i
n
n
g
g
O
O
v
v
e
e
r
r
v
v
i
i
e
e
w
w
After a non-leaking reference part (MASTER) and a tested part (WORK) are pressurized simultaneously,
isolating the MASTER and WORK from the pressure source, and the differential pressure sensor (DPS)
measure the pressure drop resulting by leaks.
1.1 Stage Summary
Stages
Start
After clamping and sealing a WORK, initiates a start signal.
Charge (CHG)
Pressurizes or evacuates the WORK and the MASTER for testing.
Balance delay (DL2)
Stops supply of test pressure. Waits for decrease in pressure changes
caused by valve operation.
Balance (BAL2)
Isolates the WORK and the MASTER from each other to measure the
pressure difference between them. Detects large leaks.
Detection (DET)
Detects small leaks. Drift compensation will be performed.
Air-blow, Exhaust and End
(BLW, EXH, END)
Transmits judgment signal, and exhausts air from inside the WORK and
MASTER from the exhaust port. Simultaneously, air-blow is performed to
clean inside the tester.
Basic Type Pneumatic Circuit (A1 Medium pressure)
Timing Chart
Solenoid
Valve
DL1
CHG
DL2
BAL2
DET
BLW
END
SV4-2
SV2
SV4-1
PRESSURE
SOURCE
PILOT
PRESSURE
F1
SV2
AV1
SV4-1
F4
V1
O
O
V1
OPTION R
SV4-2
AV4
O
SV8
OPTION J
400kPa
DPS
P.S
G
V2
MASTER
EXHAUST
WORK
S1
F2
V3
F3
AV3
G3 PILOT
PRESSURE PORT
