YOKOGAWA PUS400G, User Manual, Page: 20 / 31

< 4. Operation >
3-1
IM 19C1B3-01E
3. Operation
The PUS400G ultrasonic oscillator should be actuated when the pH meter is operated. This chapter
describes inspections before starting operation and operating procedure.
3.1 Names and Function of Each Part
You can see the in-action pilot lamp through the window in the front cover. When you remove the front
cover, you can find the power switch, fuses and so on.
Caution against Electric Shock
POWER
FUSE
2A 1A 2A
TERMINAL
U1 U2 S L1 L2
OUTPUT
ON
OFF
Be sure to ground the oscillator case.
This LED is ON when the ultrasonic
oscillator is properly operating.
Sometimes this LED lights up during
failure of the ultrasonic vibrator.
These are fuses for the power input
(L1: 1A, L2: 2A) and for the power circuit
for the ultrasonic vibrator (U1: 2A).
Some areas in the electric circuits in the panel
remain carrying high voltage for a while even
after the power switch is turned OFF.
Never touch the electric circuits for 10 minutes
after stopping power supply.
Suffix codes and the like
representing the specifications
for the PUS400G are indicated.
This switch should be turned
ON/OFF according to the
operation of the pH meter.
Be sure to keep it OFF when
the ultrasonic vibrator is NOT in
contact with measurement fluid.
These are terminals to which
the power supply wire and
the ultrasonic vibrator cable
are to be connected.
Front cover
Grounding terminal
In-action pilot lamp (LED)
Fuses
[WARNING] indication
Nameplate
Power switch
External wiring terminals
Figure 3.1 Names and Function of Each Part in PUS400G Ultrasonic Oscillator