YOKOGAWA PUS400G User manual
User’s
Manual Model PUS400G
Ultrasonic Oscillator
IM 19C1B3-01E
IM 19C1B3-01E
7th Edition
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IM 19C1B3-01E
<INTRODUCTION>
INTRODUCTION
This user’s manual describes instructions for handling of the PUS400G ultrasonic oscillator, including
procedures for installation, operation, inspection and maintenance. Also, information necessary for
you to further understand the product is described as required.
For handling of an ultrasonic vibrator for use together with this apparatus, refer to the user’s manual
attached to the instrument with the ultrasonic vibrator built in.
Model Title IM No.
PH8HS Submersion Type Holder IM 12B07M01-01E
PH8HF Flow-Through Type Holder IM 12B07N01-01E
In continuous water quality measurement, pollutive components sticking to the sensor of a water qual-
ity meter is one of the causes of inaccurate measuring results. Therefore, cleaning of the sensor is an
indispensable maintenance item for a lot of water quality meters.
Ultrasonic cleaning is one of methods for cleaning sensors. The major strong point of ultrasonic clean-
ing is that you can continuously perform it while making measurement. Ultrasonic cleaning has clean-
ing effect on most of pollutive components. Water quality meters mean pH or ORP meter.
The PUS400G ultrasonic oscillator is an apparatus for supplying an ultrasonic vibrator, built in a water
quality meter, with high-frequency energy.
Below is the description of what you should do before use of the apparatus and what you should un-
derstand before reading this instruction manual.
Specication Check
Unpack your ultrasonic oscillator with care, and check for any damage that may be caused during
transport.
The PUS400G ultrasonic oscillator is fabricated to the customer
specications. For precautionary purposes, check to see that your
ultrasonic oscillator is in accordance with your specications, and
that there is no missing accessory. Use the model codes indicated
on the nameplate to check the specications of your ultrasonic os-
cillators. For the meaning of the model codes, refer to Section 1.2.
Location of Nameplate: Panel inside apparatus.
Precautions Which Must Be Taken when Actuating PUS400G Ultrasonic Oscillator during
Inspection
NOTE
When actuating the PUS400G ultrasonic oscillator, be sure to connect the ultrasonic vibrator (under
load, that is, immersed in uid) as under normal operating conditions. Operating the ultrasonic oscil-
lator solely (or, with the ultrasonic vibrator under no load connected) may cause some electric parts to
be abnormally heated. This is unfavorable in terms of the life of the ultrasonic oscillator.
PUS400G
-NN-NN-1-E
Example on Indication of Nameplate
Media No. IM 19C1B3-01E 7th Edition : Mar. 2018YK)
All Rights Reserved Copyright © 2000, Yokogawa Electric Corporation
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IM 19C1B3-01E
<INTRODUCTION>
For the safe use of this equipment
n Safety, Protection, and Modication of the Product
• In order to protect the system controlled by the product and the product itself and ensure safe
operation, observe the safety precautions described in this user’s manual. We assume no liability
for safety if users fail to observe these instructions when operating the product.
• If this instrument is used in a manner not specied in this user’s manual, the protection provided
by this instrument may be impaired.
• Be sure to use the spare parts approved by Yokogawa Electric Corporation (hereafter simply
referred to as YOKOGAWA) when replacing parts or consumables.
• Modication of the product is strictly prohibited.
• The following symbols are used in the product and user’s manual to indicate that there are
precautions for safety:
n Notes on Handling User’s Manuals
• Please hand over the user’s manuals to your end users so that they can keep the user’s manuals
on hand for convenient reference.
• Please read the information thoroughly before using the product.
• The purpose of these user’s manuals is not to warrant that the product is well suited to any
particular purpose but rather to describe the functional details of the product.
• No part of the user’s manuals may be transferred or reproduced without prior written consent
from YOKOGAWA.
• YOKOGAWA reserves the right to make improvements in the user’s manuals and product at any
time, without notice or obligation.
• If you have any questions, or you find mistakes or omissions in the user’s manuals, please
contact our sales representative or your local distributor.
n Warning and Disclaimer
The product is provided on an “as is” basis. YOKOGAWA shall have neither liability nor responsibility
to any person or entity with respect to any direct or indirect loss or damage arising from using the
product or any defect of the product that YOKOGAWA can not predict in advance.
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IM 19C1B3-01E
<INTRODUCTION>
n Symbol Marks
Throughout this user’s manual, you will nd several different types of symbols are used to identify dif-
ferent sections of text. This section describes these icons.
WARNING
Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.
CAUTION
Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate
injury. It may also be used to alert against unsafe practices.
IMPORTANT
Indicates that operating the hardware or software in this manner may damage it or lead to system
failure.
NOTE
Draws attention to information essential for understanding the operation and features.
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<INTRODUCTION>
After-sales Warranty
nDo not modify the product.
n During the warranty period, for repair under warranty consult the local sales
representative or service ofce. Yokogawa will replace or repair any damaged
parts. Before consulting for repair under warranty, provide us with the model
name and serial number and a description of the problem. Any diagrams or
data explaining the problem would also be appreciated.
lIf we replace the product with a new one, we won’t provide you with a repair report.
lYokogawa warrants the product for the period stated in the pre-purchase quotation Yokogawa
shall conduct dened warranty service based on its standard. When the customer site is located
outside of the service area, a fee for dispatching the maintenance engineer will be charged to the
customer.
n In the following cases, customer will be charged repair fee regardless of war-
ranty period.
• Failure of components which are out of scope of warranty stated in instruction manual.
• Failure caused by usage of software, hardware or auxiliary equipment, which Yokogawa Electric
did not supply.
• Failure due to improper or insufcient maintenance by user.
• Failure due to modication, misuse or outside-of-specications operation which Yokogawa does
not authorize.
• Failure due to power supply (voltage, frequency) being outside specications or abnormal.
• Failure caused by any usage out of scope of recommended usage.
• Any damage from re, earthquake, storms and oods, lightning, disturbances, riots, warfare,
radiation and other natural changes.
n Yokogawa does not warrant conformance with the specic application at the
user site. Yokogawa will not bear direct/indirect responsibility for damage due
to a specic application.
n Yokogawa Electric will not bear responsibility when the user congures the
product into systems or resells the product.
n Maintenance service and supplying repair parts will be covered for ve years
after the production ends. For repair for this product, please contact the near-
est sales ofce described in this instruction manual.
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IM 19C1B3-01E
<CONTENTS>
Model PUS400G
Ultrasonic Oscillator
CONTENTS
IM 19C1B3-01E 7th Edition
INTRODUCTION...................................................................................................i
For the safe use of this equipment ...................................................................ii
After-sales Warranty..........................................................................................iv
1. Overview.................................................................................................... 1-1
1.1 Standard Specications................................................................................... 1-1
1.2 Model and Sufx Codes ................................................................................... 1-2
1.3 External Dimensions ........................................................................................ 1-3
2. Installation and Wiring............................................................................. 2-1
2.1 Installation ......................................................................................................... 2-1
2.1.1 Installation Site................................................................................... 2-1
2.1.2 Installing Procedure ........................................................................... 2-2
2.2 Wiring ................................................................................................................. 2-4
2.2.1 Types of Wiring .................................................................................. 2-4
2.2.2 Cable Protection by Conduit .............................................................. 2-4
2.2.3 Connecting Ultrasonic Vibrator Cable ............................................... 2-5
2.2.4 Power Supply Wiring ......................................................................... 2-5
2.2.5 Ground Wiring ................................................................................... 2-5
3. Operation................................................................................................... 3-1
3.1 Names and Function of Each Part .................................................................. 3-1
3.2 Preparation for Operation ................................................................................ 3-2
3.2.1 Inspecting State of Wiring Installation................................................ 3-2
3.3 Steady State Operation .................................................................................... 3-2
3.3.1 If In-Action Pilot Lamp Goes OFF (Related information: Section 4.2)3-2
3.3.2 Stopping and Restarting Operation ................................................... 3-2
4. Inspection and Maintenance................................................................... 4-1
4.1 Inspecting State of Ultrasonic Wave Application.......................................... 4-1
4.1.1 Checking State of Ultrasonic Oscillator Operation ........................... 4-1
4.1.2 Checking Cleaning Effect .................................................................. 4-1
4.2 Inspection When In-Action Pilot Lamp is OFF............................................... 4-2
4.2.1 Cause of Pilot Lamp Going Out ......................................................... 4-2
4.2.2 Replacing Procedure for Fuse........................................................... 4-2
5. Troubleshooting ....................................................................................... 5-1
5.1 Remedies for Troubles ..................................................................................... 5-1
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<CONTENTS>
5.1.1 Troubles and Possible Causes .......................................................... 5-1
5.1.2 Remedy for Supply Voltage Drop ...................................................... 5-1
5.2 Part Replacing Procedure ............................................................................... 5-2
5.2.1 Replacing Ultrasonic Vibrator Cable.................................................. 5-2
5.2.2 Inspecting and Replacing Procedures for Ultrasonic Vibrator .......... 5-2
5.2.3 Inspection of and Repair to Ultrasonic Oscillator .............................. 5-2
Customer Maintenance Parts List......................................CMPL 19C01B03-01E
Revision Information ...............................................................................................i
< 1. Overview > 1-1
IM 19C1B3-01E
1. Overview
The PUS400G ultrasonic oscillator is an apparatus that composes an ultrasonic cleaner together with
an ultrasonic piezoelectric transducer (vibrator). The PUS400G supplies the ultrasonic vibrator with
operating power via a cable.
The ultrasonic vibrator to be combined with the PUS400G is a vibrator mode of lead zirconate-
titanate-based piezoelectric ceramics.
The ultrasonic vibrator is built in the sensor holder of the pH meter.
Ultrasonic vibrator
Ultrasonic
vibrator cable
Ultrasonic
vibrator cable
PUS400G
Ultrasonic oscillator PUS400G
Ultrasonic oscillator
PH8HF Flow-through
type holder
PH8HS Submersion
type holder
Figure 1.1 Conguration of Ultrasonic Cleaner Using PUS400G Ultrasonic Oscillator
This chapter gives the description of the specications for the PUS400G ultrasonic oscillator.
1.1 Standard Specications
Combination device: Holder with ultrasonic cleaner (PH8HS, PH8HF)
Connection cables are provided with holders.
Cleaning method: Continuous ultrasonic emission (Frequency sweep method)
Oscillation frequency: Approx. 61 to 81 kHz
Output voltage: Approx. 70 V
(Note) Output of ultrasonic oscillator changes with power supply voltage or connected cable
length.
Power supply: 100/110/115/200/220/240 V AC±10% 50/60 Hz
Power consumption: Approx. 15 VA
Ambient Temperature: -10 to 50°C (hood may be tting as option)
Storage Temperature: -25 to 70°C
Construction: JIS C0920 Watertight (NEMA 4 equivalent waterproof construction)
Material: Case; Aluminium alloy casting
Window;Polycarbonate
Mounting bracket; Stainless steel
Finish: Baked polyurethane resin (Standard)
Baked epoxy resin (Option)
Color: Case; Frosty white (Munsell 2.5Y8.4/1.2 or equivalent)
Cover; Deep sea-moss green (Munsell 0.6GY3.1/2.0 equivalent)
< 1. Overview >
1-2
IM 19C1B3-01E
Mounting: 2-inch pipe mounting, wall or rack mounting or panel mounting
Cable inlet: Ø22.7 X 2 Pg16 watertight plastic gland
Cable / Terminal: For 7 to 12 mm O.D, M4 screw
Conduit adapter: Power supply side only (Option)
Connection; G1/2 or 1/2NPT
Weight: Body; Approx. 2.0 kg
Pipe mounting bracket; Approx. 0.7 kg
Wall mounting bracket; Approx. 0.4 kg
Noise lter assembly: (only for PUS400G-NN-KC)
Ambient temperature: -10 to 50°C (no dew condensation allowed)
Strage temperature: -25 to 70°C
Construction: JIS C 0920 Watertight (IP53)
Regulatory Compliance (for PUS400G-NN-KC)
Korea Electromagnetic Conformity Standard Class A 한국 전자파적합성 기준
A급 기기 (업무용 방송통신기자재)
이 기기는 업무용(A급) 전자파적합기기로서 판매자 또는
사용자는 이 점을 주의하시기 바라며, 가정외의 지역에서
사용하는 것을 목적으로 합니다.
RCM: EN55011 Class 1 Group 1
1.2 Model and Sufx Codes
Model Sufx Code Option Code Description
PUS400G .................................. ....................... Ultrasonic oscillator for pH meter
— -NN ....................... Always -NN
Application -NN
-KC
.......................
.......................
General purpose
General purpose for Korea and Australia
Power Supply -1
-2
-3
-4
-5
-6
.......................
.......................
.......................
.......................
.......................
.......................
100V AC 50/60Hz
110V AC 50/60Hz
115V AC 50/60Hz
200V AC 50/60Hz
220V AC 50/60Hz
240V AC 50/60Hz
Language -E
-J
.......................
.......................
English
Japanese
Option Mounting Bracket
Hood
Special Finish
Tag Plate
Conduit Adaptor
/PS
/W
/PA
/H
/H2
/X1
/SCT
/AFTG
/ANSI
/SPS
Pipe mounting bracket (stainless steel)
Wall mounting bracket (stainless steel)
Panel mounting bracket (stainless steel)
Awning hood (carbon steel)
Awning hood (stainless steel)
Baked epoxy resin
Stainless steel tag plate
G1/2
1/2 NPT
Teon coated SUS steel screws
Accessories
Part Name Part Number Remarks
Spare Fuse K9317AZ 1 A : 1 pc, 2 A : 2 pcs
< 1. Overview > 1-3
IM 19C1B3-01E
1.3 External Dimensions
162
130
50
180
202 155
115 48
30
68
96
42
56
Weight : Approx. 2.0 kg
Power supply cable inlet port with
cable gland (Pg16 or equivalent)
Ultrasonic transducer cable inlet port, with
cable gland (Pg16 or equivalent)
2-M5 screws (for mounting bracket)
Ground terminal :
M4 screw
Hood (optional)
Unit : mm
Conduit connecting adapter (option code: /AFTG, /ANSI)
49
Approx. 55
G1/2 female ( / AFTG)
1/2NPT female ( / ANSI)
Adapter
Unit : mm
Cable gland
Case
Nut Packing
Pipe Mounting Bracket (option code: /PS)
288
155
115 48
110
30
151
203
100
56±0.2
70±0.2
27 8
50
48
Unit : mm
2-Ø6.6 holes
(for oscillator)
2-Ø5.5 holes
(for hood)
2-inch (OD Ø60.5)
pipe(vertical mounting)
2-inch (OD Ø60.5)
pipe(horizontal mounting)
Weight: Approx. 0.7 kg
< 1. Overview >
1-4
IM 19C1B3-01E
Panel Mounting Bracket (option code: /PA)
30
60
3.9 185
205
80
38
138
138
173 +1.1
0
156+1.1
0
121
121
1 to10 (panel thickness)
Panel cutout dimensionsWeight: Approx. 0.4 kg
Unit : mm
Panel mounting hardware
2-M5 Screws
Wall Mounting Bracket (option code: /W)
30
60
3.98038
185
827
27
15
100
70±0.2
13
56±0.2
70±0.2
2-Ø6.6 holes
(for oscillator)
2-Ø5.5 holes
(for hood)
Weight: Approx. 0.4 kg
Unit : mm
3-Ø10 holes
Noise lter assembly (only for PUS400G-NN-KC) Unit: mm
17
10 92
275
203
4-M5 screws, (depth:10mm)
(for mounting)
152
36
Dedicated power cable outlet
(cable OD of Ø6 to Ø12)
External power cable inlet
75
70
Weight of power cable: Approx. 0.2 kg
Dedicated power cable for noise filter assembly
Weight of noise filter assembly: Approx. 2 kg
Cable length : Approx. 0.7 m
Black L1
White L2
Green G
Approx. 80
Approx. 80
G Green
L2 White
L1 Black
< 1. Overview > 1-5
IM 19C1B3-01E
• Pipe Mounting Bracket for Noise lter assembly (option code: /PS) Unit: mm
Pipe mounting bracket 2
2-inch pipe (vertical
mounting OD Ø60.5)
2-Ø9 holes
200
Weight: Approx. 0.7 kg
4-M5 screws
U-bolt
3515
70
Pipe mounting bracket 1
70
5- Ø6.5 holes
Ø6.5 x 13 hole
2- Ø5.5 holes
4-Ø10 holes
100
35 75 8
(10) (92) (54)
M8 nut ×2
• Wall or Panel Mounting Bracket for Noise lter assembly (option code: /W, /PA) Unit: mm
Weight: Approx. 0.7 kg
4- Ø10 holes
(10) (92)
13
4-M6 screw
(customer’s
scope)
15
70
100
35 35
Wall mounting bracket
2- Ø5.5 holes
5- Ø6.5 holes
Ø6.5 x13 hole
200
75 8
70
4-M5 screw
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< 2. Installation and Wiring > 2-1
IM 19C1B3-01E
2. Installation and Wiring
The PUS400G ultrasonic oscillator should be installed in a place where the power switch is easily
turned ON/OFF and the “in-action” pilot lamp. Install the PUS400G as close to the pH meter sensor
holder as possible.
This chapter describes how to select an installation site and procedures for installation and wiring.
2.1 Installation
The PUS400G ultrasonic oscillator may be installed outdoors. However, it should be installed in as
favorable an environment as possible in order to keep its electric circuits in good condition.
2.1.1 Installation Site
Install the PUS400G ultrasonic oscillator in a place where the following requirements are met:
• The PUS400G must be installed as close to the location of the ultrasonic vibrator as
possible.
The cable of the ultrasonic piezoelectric transducer (ultrasonic vibrator cable) built in the
sensor holder of the pH meter is at most three meters (ow-through type holder) or ve meters
(submersion type holder) in length. The ultrasonic oscillator must be installed close to the
ultrasonic vibrator.
• The PUS400G must be installed in a place free from corrosive gases.
Corrosive gases damage the electric parts in the oscillator and should be avoided.
• The PUS400G must be installed in a place with less uctuation in temperature at ordinary
temperature or a temperature close to ordinary temperature.
The uctuation in temperature at the installation site should be within the range of -10 to 50°C.
• The PUS400G must be installed in a place where a humidity of 5 to 90% HR is maintained.
Avoid installing the ultrasonic oscillator in a place where a high or low humidity is maintained for
a long time. It is recommended to always operate the PUS400G at a humidity of 25 to 85% RH.
• The PUS400G must be installed in a place not exposed to direct sunlight.
Direct sunlight may excessively increase
temperature in the oscillator. If there is any high
temperature equipment nearby, temperature
in the oscillator may be also excessively
increased due to radiant heat. If temperature
in the oscillator is likely to rise and exceed
allowable limit due to direct sunlight, then install
a sunshade hood (optional)
Figure 2.1 Sunshade as Installed
< 2. Installation and Wiring >
2-2
IM 19C1B3-01E
2.1.2 Installing Procedure
The ultrasonic oscillator may be mounted on panel, a wall surface or a pipe (2-inch, OD: 60.5 mm).
Hardware corresponding to the type of mounting used is required to install the PUS400G. Mounting
hardware is attached only when requested.
In the case of PUS400G-NN-KC (for Korea), a noise lter assembly is attached. Please refer to a
gure of external dimensions for the attachment means of the noise lter assembly.
(1) Panel Mounting
Figure 2.2 illustrates the installing procedure for the ultrasonic oscillator using panel mounting bracket.
Panel
Panel mounting bracket
Panel retaining screw
Figure 2.2 Mounting Method for Ultrasonic Oscillator Using Panel Mounting Bracket
To mount the PUS400G on a panel, cut out the panel in accordance with Figure 2.3.
173+1.1
0
156
+1.1
0
121
121
138 138
Unit : mm
Figure 2.3 Panel Cutout Dimensions
< 2. Installation and Wiring > 2-3
IM 19C1B3-01E
(2) Pipe Mounting
When mounting the PUS400G on a pipe, install a pipe (2-inch, OD: 60.5 mm) in the vertical or
horizontal direction.
Figure 2.4 illustrates the installing procedure for the ultrasonic oscillator using pipe mounting bracket.
Pipe mounting bracket
2-inch pipe
Ultrasonic oscillator
Figure 2.4 Ultrasonic Oscillator as Mounted on Pipe
(3) Wall Mounting
Figure 2.5 illustrates the installing procedure for the ultrasonic oscillator using wall mounting bracket.
Drill screw holes (for M8 screw, 3 places) in accordance with the gure below before mounting the
PUS400G.
27±0.2
70±0.2
Wall mounting bracket
Mounting screw (M8 3 pcs, customer’s scope)
Retaining screw (2 pcs attached)
M8 screw holes 3 pcs
Unit : mm
Figure 2.5 Hardware and Procedure for Wall Mounting
< 2. Installation and Wiring >
2-4
IM 19C1B3-01E
2.2 Wiring
This section describes types of wiring installed for the PUS400G ultrasonic oscillator and wiring work
procedures type by type.
2.2.1 Types of Wiring
There are three types of wiring installed for the PUS400G ultrasonic oscillator. The ultrasonic vibrator
cable (of a specied length) is attached to the sensor holder of the pH meter.
• Ultrasonic vibrator cable connection (power line for ultrasonic vibrator)
• Power supply wiring
• Grounding wiring
Figure 2.6 illustrates the connecting terminals for these types of wiring.
U1
U2
S
L1
L2
Sensor holder
PUS400G Ultrasonic oscillator
Ultrasonic
vibrator
Ultrasonic vibrator cable
Power supply Ground (100Ω or less)
Noise filter
assembly *
Dedicated power cable *
* Only for PUS400G-NN-KC
Figure 2.6 External Wiring Diagram
2.2.2 Cable Protection by Conduit
The power cable connected to the ultrasonic oscillator can be protected by conduits to prevent
damage to its coating. In this case a dedicated cable gland with an adapter for conduit connection is
required. The cable gland with an adapter is attached only when requested.
[Mounting Procedure for Cable Gland with Conduit Connecting Adapter]
Remove the cable gland (DIN Pg16 or equivalent) from the cable inlet in the ultrasonic oscillator, and
install the attached cable gland (JIS 15A or equivalent) and the adapter for conduit connection, as
shown in Figure 2.7.
Firmly tighten the gasket to prevent moisture from entering the oscillator through the cable inlet.
49
Approx. 55
G1/2 female ( / AFTG)
1/2NPT female ( / ANSI)
Adapter
Unit : mm
Cable gland
Case
Nut Packing
Figure 2.7 How to Install Adapter for Conduit Work
< 2. Installation and Wiring > 2-5
IM 19C1B3-01E
2.2.3 Connecting Ultrasonic Vibrator Cable
Connect the cable of the ultrasonic vibrator (power line for ultrasonic vibrator) to Terminals U1, U2 and
S on the PUS400G ultrasonic oscillator.
The ultrasonic vibrator cable must be connected direct to the terminals on the ultrasonic oscillator.
If the length of the ultrasonic vibrator cable is insufcient, shift the location of the installation of the
ultrasonic oscillator close to the pH holder.
The ultrasonic vibrator cable is provided with a cable gland (JIS A8 or equivalent).
This cable gland is unnecessary if the ultrasonic vibrator cable is connected to the PUS400G
ultrasonic oscillator. Remove it or shift it to a position where wiring work will not be interfered with.
2.2.4 Power Supply Wiring
Use a two-core cable with a conductor nominal cross-sectional area of 0.5 mm2or above for power
supply wiring.
Connect the cable from a power supply having a specied voltage (voltage uctuation: within a range
of ±10% of nominal voltage) to Terminal L1 and L2 on the ultrasonic vibrator.
Note: If the supply voltage drops below the allowable range, the power of ultrasonic waves is
weakened, which may result in the degradation in cleaning effect.
The screw size of the terminals is M4. Use a crimp contact conformable to the size for cable
termination.
Place in the power supply wiring a switch for shutting off the power supply to the ultrasonic oscillator.
With this switch provided, safety is ensured when the wires are removed from the ultrasonic oscillator
for repair or the like. Use the power switch inside the PUS400G ultrasonic oscillator to start or stop it
for or during steady state operation.
In the case of PUS400G-NN-KC (for Korea), please wire a noise lter assembly by all means.
2.2.5 Ground Wiring
The PUS400G ultrasonic oscillator should be grounded to earth (grounding resistance: 100Ω or
below). Use a conductor with a nominal cross-sectional area of 2 mm2or above. The grounding
terminal is located on the left side at the lower part of the case (when viewed from front) (Refer to the
external dimensions on Sec. 1.3.) The terminal uses a M4 screw.
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< 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 nd 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
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