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PH8HF
User Manual
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YOKOGAWA PH8HF, PH8HFF User Manual

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User ’s Manual
Model PH8HF, PH8HFF Flow-Through Type Holder
IM 12B07N01-01E
IM 12B07N01-01E
6th Edition

INTRODUCTION

This manual covers the PH8HF, PH8HFF Flow-Through Type Holder. Other related items are described in the following manuals:
Model Title IM No.
PH8ERP KCl Rellable type pH Sensor IM 12B7K1-02E
PH8EFP KCl Filling type pH Sensor IM 12B7J1-01E
PH8EHP pH Sensor for Pure Water IM 12B7J2-01E PH4,OR4
FLXA202,FLXA21 2-Wire Liquid Analyzer IM 12A01A02-01E
PH201G*B Distributor IM 19B1E4-02E
FLXA402 4-Wire Converter IM 12A01F01-02EN
PH450G pH/ORP Converter IM 12B07C05-01E
PUS400G Ultrasonic Oscillator IM 19C1B3-01E
PH8USF, PH8AL Ultrasonic Oscillator (Explosionproof Type), Alarm Box IM 12B5U2-E
WTB10-PH
PH8TBG Terminal Box IM 12B07W01-01E
OR8EFG KCl Filling type OPR Sensor IM 12C07J01-01E
OR8ERG KCl Rellable type OPR Sensor IM 12C04K01-01E
OR8TBG Terminal Box IM 12C04W01-01E
pH and ORP Sensors IM 12B10B00-01EN
Terminal Box IM 19D01B01-01E
<INTRODUCTION>
IM 12A01F02-01EN etc.
i
Media No. IM 12B07N01-01E 6th Edition : Nov. 2018 (YK) All Rights Reserved Copyright © 2004, Yokogawa Electric Corporation
ii
<INTRODUCTION>

For the safe use of this equipment

 Safety,Protection,andModicationoftheProduct
n
• 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 specied 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.
• Modication of the product is strictly prohibited.
Notes on Handling User’s Manuals
n
• 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 nd mistakes or omissions in the user’s manuals, please contact our sales representative or your local distributor.
Warning and Disclaimer
n
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.
n Signal Words
The following words are used in this manual.
CAUTION
This symbol gives information essential for understanding the operations and functions.
NOTE
This symbol indicates information that complements the present topic.

After-sales Warranty

n Do not modify the product.
n During the warranty period, for repair under warranty consult the local sales representative
or service o󰀩ce. 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.
• If we replace the product with a new one, we won’t provide you with a repair report.
• Yokogawa warrants the product for the period stated in the pre-purchase quotation Yokoga­wa shall conduct dened 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.
• Returned goods that have been in contact with process uids must be decontaminated and disinfected prior to shipment. Goods should carry a certicate to this e󰀨ect, for the health and safety of our employees. Material Safety Data sheets must be included for all compo­nents of the process to which the sensor have been exposed.
n In the following cases, customer will be charged repair fee regardless of warranty 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 insu󰀩cient maintenance by user.
• Failure due to modication, misuse or outside-of-specications operation which Yokogawa does not authorize.
• Failure due to power supply (voltage, frequency) being outside specications 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 specic application at the user site.
Yokogawa will not bear direct/indirect responsibility for damage due to a specic application.
<INTRODUCTION>
iii
n Yokogawa Electric will not bear responsibility when the user congures the product into
systems or resells the product.
n Maintenance service and supplying repair parts will be covered for ve years after the pro-
duction ends. For repair for this product, please contact the nearest sales o󰀩ce described in this instruction manual.
<CONTENTS>
Model PH8HF, PH8HFF Flow-Through Type Holder
IM 12B07N01-01E 6th Edition
CONTENTS
INTRODUCTION .............................................................................................i
For the safe use of this equipment .............................................................ii
After-sales Warranty ...................................................................................iii
1. Specications ........................................................................................... 1-1
1.1 GeneralSpecications ..................................................................................... 1-1
1.1.1 PH8HF Flow-through Type Holder ....................................................1-1
1.1.2 PH8HFF (Explosionproof Type) ........................................................ 1-2
1.2 ModelandSu󰀩xcodes .................................................................................... 1-3
1.2.1 Flow-Through Type Holder PH8HF ................................................... 1-3
1.2.2 Flow-Through Type Holder (Explosionproof Type) PH8HFF ............ 1-4
1.3 ExternalDimensions ........................................................................................1-5
v
2. Installation, Piping and Wiring ................................................................ 2-1
2.1 Holder Installation ............................................................................................. 2-1
2.1.1 Installation Site .................................................................................. 2-1
2.1.2 Mounting the Flow-through Type Holder ........................................... 2-1
2.2 Process Piping .................................................................................................. 2-2
2.2.1 Main Precautions for Piping ............................................................... 2-2
2.2.2 Piping Procedure ...............................................................................2-4
2.3 Installing the Sensor ......................................................................................... 2-5
2.4 Cleaner Piping .................................................................................................. 2-5
2.4.1 Piping Precautions ............................................................................. 2-5
2.4.2 Piping Procedure ...............................................................................2-7
2.4.3 Installation of PH8PU1 Washer Pump and Water Tank ....................2-8
2.5 Wiring ................................................................................................................. 2-8
2.5.1 Ultrasonic Oscillator Circuit Wiring .................................................... 2-8
2.5.2 Solenoid Valve Circuit Wiring ............................................................. 2-8
2.5.3 Wiring for PH8PU1 Washer Pump and Tank ..................................... 2-9
3. Maintenance/Inspection .......................................................................... 3-1
3.1 Cleaning the Holder .......................................................................................... 3-1
3.1.1 Inspecting the O-ring Seal ................................................................3-1
3.2 Checking the Cleaning Element ...................................................................... 3-2
3.2.1 Jet Cleaning Element ......................................................................... 3-2
3.2.2 Cleaning the Brush ............................................................................ 3-2
vi
<CONTENTS>
3.2.3 Ultrasonic Cleaning Element ............................................................. 3-3
3.2.4 Maintenance of PH8PU1 Washer Pump and Tank .......................... 3-4
Customer Maintenance Parts List ...................................... CMPL 12B05N01-01E
Revision Information ...............................................................................................i
IM 12B07N01-01E
< 1. Specications >
1. Specications
The Model PH8HF¨ ow-through type holder is used:
• To connect two pipes and provide a “ow-through” path between them.
• To mount a pH sensor; the sensor measures the pH of liquid owing through the holder.
Holder versions with or without cleaning for the pH sensor - ultrasonic cleaning or air/water jet cleaning - are available.
1.1 GeneralSpecications

1.1.1 PH8HF Flow-through Type Holder

Applicable sensors:
General pH Sensor PH8ERP, PH8EFP
PH4 Sensor PH4P, PH4PT,PH4F, PH4FT,PH4C, PH4CT
General ORP Sensor OR8ERG, OR8EFG
OR4 Sensor OR4P, OR4C
Note: An adapter is required when using PH4/OR4 sensor.
When using with PH4/OR4 sensor, this holder cannot be used outdoors due to exposure to rain or due to condensation
at a high humid place.
Mounting:
2-inch pipe mounting vertical or horizontal,with 1 set of mounting hard bracket.
Note: Make sure the mounting pipe is rmly installed.
Cleaning method:
Jet cleaning, brush cleaning or ultrasonic cleaning
Note: Brush cleaning and ultrasonic cleaning cannot be used when using PH4/OR4 sensor.
Material:
Holder; Polypropylene or stainless steel(equivalent to SUS316)
O-ring; Fluoro rubber (FKM) or Peruoroelastomer (FFKM)
Mounting bracket: Stainless steel (equivalent to SUS304)
Cleaning unit (wetted parts);
Ultrasonic;Stainless steel (equivalent to SUS316), titanium or Hastelloy C
Jet; Polypropylene
Brush; Polypropylene, titanium(shaft), Rulon®(bearings)
Weight:
Holder; Approx. 0.4 to 1.7 kg (polypropylene)
Approx. 3 to 6.1 kg (stainless steel)
Mounting bracket; Approx. 0.5 kg
Temperature range:
No Cleaning: -5 to 80 °C (polypropylene)
-5 to 105°C (stainless steel)
With Cleaning: -5 to 80°C
Note: The temperature may be limited by the specications of the sensor.
Flow rate: 3 to 11 L/min
Note: The ow rate may be limited by the specications of the sensor.
Pressure: Atmospheric pressure to 500 kPa
Note: The pressure may be limited by the specications of the sensor.
1-1
1-2
< 1. Specications >
Utility required for cleaning unit:Utility required for cleaning unit:
Type Pressure (kPa) Flow Ratee
Water jet 200 to 400 + Liquid pressure 5 to 20 l/min
Water brush 100 to 250 + Liquid pressure 20 to 30 l/min
Air jet 200 to 400 + Liquid pressure 100 to 300 Nl/min
Air brush 150 to 250 + Liquid pressure 300 to 600 Nl/min
Note 1: Pressure and ow rate must be simultaneously satised at the holder inlet port. Note 2: A large braid-reinforced tube of ø22 x ø15 is recommended for supply due to the ow rate.
1.1.2 PH8HFF(ExplosionproofType)
The holder is used only when using Ultrasonic cleaning system in the explosionproof area.
Use PH8HF when using no cleaning, jet cleaning or brush cleaning.
Applicable sensors:
General pH Sensor PH8ERP, PH8EFP
General ORP Sensor OR8ERG, OR8EFG
Mounting: 2-inch pipe mounting vertical or horizontal, with 1 set of mounting bracket.
Note: Make sure the mounting pipe is rmly installed.
Cleaning method: Ultrasonic cleaning
Material:
Holder; Polypropylene or stainless steel (equivalent to SUS316)
O-ring; Fluoro rubber (FKM) or Peruoroelastomer (FFKM)
Mounting bracket; Stainless steel (equivalent to SUS304)
Cleaning unit (wetted parts):
Ultrasonic; Stainless steel (equivalent to SUS316), titanium or Hastelloy C
Construction:
TIIS ameproof type (for d2G4 gas) Cable entrance port of terminal box; G 3/4
Weight:
Holder; Approx. 3 to 3.2 kg (polypropylene)
Approx. 5.6 to 7.6 kg (stainless steel)
Mounting bracket; Approx. 0.5 kg
Temperature range: -5 to 80°C
Note: The temperature may be limited by the specications of the sensor.
Flow rate: 3 to 11 L/min
Note: The ow rate may be limited by the specications of the sensor.
Pressure: Atmospheric pressure to 500 kPa
Note: The pressure may be limited by the specications of the sensor.
IM 12B07N01-01E
< 1. Specications >
1.2 ModelandSu󰀩xcodes

1.2.1 Flow-Through Type Holder PH8HF

1-3
O-ring
Option Code
................
................
................
................
................
................
................
................
................
................
................
................
................
................
................
................
................
................
................
................
................
................
................
...................
/MF1 /PF
105 100
80
60
(°C)
40
20
Temperature
Description
Flow-through type holder
Polypropylene (Refer to note below for selection) Stainless steel Heat-resistant PVC Titanium
Rc1
1 NPT female thread JIS 10K 25 FF (*6) ANSI Class 150 1 FF ange (for polypropylene holder -PP) (*6) ANSI Class 150 1 RF ange with serration (for SUS316 holder -S3)
None
For ultrasonic cleaning (Transducer: SUS316) (*1) For ultrasonic cleaning (Transducer: Titanium) (*2) For ultrasonic cleaning (Transducer: Hastelloy C) (*3) For jet cleaning. The solenoid valve must be specied separately For brush cleaning. The solenoid valve must be specied separately
None
1m 3m 7m 10m 15m 20m Rc1/2 1/2 NPT
Style A Mounting bracket (stainless steel) (*5)
Peruoroelastomer (FFKM) (*4)
Stainless Steel
Polypropylene (or Stainless Steel)
0 100
200 300
Pressure (kPa)
400 500
Model Su󰀩xCode
PH8HF
Material (*7) -PP
Process Connection -JPT
pH Measuring System -T ................ Always -T
Cleaning System -NN
Cable Length for Ultrasonic Cleaning
Connector for Jet or Brush Cleaning
Style Code *A Option Special Mounting
*1: General purpose (Normal pH 3 to 14) *2: For salt water *3: For acid (Normal pH 0 to 4) *4: Choose Peruoroelastomer (FFKM) when this holder is used in organic solvent, high alkali or high temperature alkali. *5: Mounting bracket is generally not required when the stainless steel holder is installed in-line in a pipe It is required where the holder is installed in a sampling rack (in which case the U-bolt included in /MF1 in not used). *6: Only mating dimensioms are according to ange standard. *7: Criteria for material selection (-PP or -S3) In general, polypropylene is recommended from the viewpoint of chemical resistance. However stainless steel is recommend in any of the following cases:
• The liquid contains organic reagent, oxidizing agents, etc., which can attack polypropylene.
• The temperature/pressure correlation of the process condition falls within the hatched area of the diagram shown right.
• The use of polypropylene is not reasonable from a viewpoint of strength or past experience.
For stainless steel, normally a 3 to 14 pH value is recommended.
................................................. ................
-S3
-PV
-TN
-NPT
-J10
-A15
-S3
-TN
-HC
-JT
-BR
-NN
-C1
-C3
-C6
-C7
-C8
-C9
-JP
-NP
1-4
< 1. Specications >
1.2.2 Flow-ThroughTypeHolder(ExplosionproofType)
PH8HFF
[Style: S2]
O-ring
(°C)
Option Code
................
................
................
................
................
................
................
................
................
...................
/MF1 /PG2 /SCT /PF
105 100
80
60
40
20
Polypropylene (or Stainless Steel)
Temperature
0 100
Description
Flow-through type holder Polypropylene (Refer to note below for selection)
Stainless steel
Rc1
1 NPT female thread JIS 10K 25 FF ange ANSI Class 150 1 FF ange equivalent (for polypropylene holder -PP) ANSI Class 150 1 RF Flange with serration (for SUS316 holder -S3)
(SUS316 transducer) (*1) (Titanium transducer) (*2) (Hastelloy C transducer) (*3)
Style A Mounting bracket (stainless steel) (*6)
JIS ameproof packing adapter 3/4 inch Stainless steel tag plate Peruoroelastomer (FFKM) (*5)
Stainless Steel
200 300
Pressure (kPa)
400 500
Model Su󰀩xCode
PH8HFF
Material (*7) -PP
Process Connection -JPT
pH Measuring System -T ................ Always -T
Cleaning System (*4) (Ultrasonic cleaning only)
Explosion Protection -JS ................ TIIS Flameproof (d2G4)
Style Code *A Option Special Mounting
*1: General purpose (Normal pH 3 to 14) *2: For salt water *3: For acid (Normal pH 0 to 4) *4: Use PH8HS for no cleaning, Jet cleaning or Brush cleaning. *5: Choose Peruoroelastomer (FFKM) when this holder is used in organic solvent, high alkali or high temperature alkali. *6: Mounting bracket is generally not required when the stainless steel holder is installed in-line in a pipe It is required where the holder is installed in a sampling rack (in which case the U-bolt included in /MF1 in not used). *7: Criteria for material selection (-PP or -S3) In general, polypropylene is recommended from the viewpoint of chemical resistance. However stainless steel is recommend in any of the following cases:
• The liquid contains organic reagent, oxidizing agents, etc., which can attack polypropylene.
• The temperature/pressure correlation of the process condition falls within the hatched area of the diagram shown right.
• The use of polypropylene is not reasonable from a viewpoint of strength or past experience.
For stainless steel, normally a 3 to 14 pH value is recommended.
................................................. ................
-S3
-NPT
-J10
-A15
-S3
-TN
-HC
Flameproof Packing
Tag Plate
CAUTION
Select the material of wetted parts with careful consideration of process characteristics. Inappropriate selection may cause leakage of process uids, which greatly a󰀨ects facilities. Considerable care must be taken particularly in the case of strongly corrosive process uid such as hydrochloric acid, sulfuric acid, hydrogen sulde, and sodium hypochlorite. If you have any questions about the wetted part construction of the product, be sure to contact Yokogawa.
IM 12B07N01-01E
< 1. Specications >
1.3 ExternalDimensions
1. PH8HF - PP - ¨PT - T - NN - NN, PH8HF - S3 - ¨PT - T - NN - NN UNIT: mm
1-5
Øa
O-Ring
Ød
Model and Code A Screw a d g h Weight
PH8HF-PP-JPT-T-NN-NN
PH8HF-PP-NPT-T-NN-NN
PH8HF-S3-JPT-T-NN-NN
PH8HF-S3-NPT-T-NN-NN
Rc1
1NPT
Rc1
1NPT
h
80
80
70
70
(pH sensor)
g
Approx. 60
Approx. 60
Approx. 60
Approx. 60
Inlet
Approx. 70
Approx. 70
Approx. 70
Approx. 70
100±1
Approx. 250
Approx. 250
Approx. 243
Approx. 243
A Screw
Outlet
110
±1
O-Ring
Approx. 0.4kg
Approx. 0.4kg
Approx. 3kg
Approx. 3kg
□ Mounting Bracket (Option Code : /MF1) Weight : Approx. 0.5 kg
26
Approx. 82
Approx. 130
75
45
2B(O.D. 60.5) Pipe
140
Figure 1.1 Flow-Through Type Holder
Bracket (Thickness : 3)
Mounting holes for holder
6-Ø10 holes
75
70±0.3
45
10
70±0.3
92
Holes Dimension for Wall Mounting
1-6
< 1. Specications >
2. PH8HF - PP - ¨1¨ - T - NN – NN, PH8HF - S3 - ¨1¨ - T - NN - NN UNIT: mm
Øa
O-Ring
Ød
h
Model and Code A C D E a d h
PH8HF-PP-J10-T-NN-NN
PH8HF-PP-A15-T-NN-NN
PH8HF-S3-J10-T-NN-NN
PH8HF-S3-A15-T-NN-NN
125
108
125
108
B
90
79.4
90
79.2
14
14.2
14
14.2
19
15.7
19
15.7
-
-
-
2
110 ±1
g
80
80
70
70
(pH sensor)
Inlet
Approx. 60
Approx. 60
Approx. 60
Approx. 60
150
g
Approx. 70
Approx. 70
Approx. 70
Approx. 70
±1
Approx. 250
Approx. 250
Approx. 243
Approx. 243
Outlet
E
C
O-Ring
4-ØD hole
ØB ØA
Weight
Approx. 0.6kg
Approx. 0.6kg
Approx. 5kg
Approx. 5kg
□ Mounting Bracket (Option Code : /MF1) Weight : Approx. 0.5 kg
26
75
45
Approx. 82
Approx. 130
2B(O.D. 60.5) Pipe
Figure 1.2 Flow-Through Type Holder (with Flange)
Bracket (Thickness : 3)
Mounting holes for holder
75
140
45
70±0.3
92
Holes Dimension for Wall Mounting
6-Ø10 holes
70±0.3
10
IM 12B07N01-01E
< 1. Specications >
PH8HF - PV - ¨1¨ - T - NN – NN UNIT: mm
1-7
ø80
9
ø60
Model and Code
PH8HF-PV-J10-h-NN-NN
PH8HF-PV-A15-h-NN-NN
O-Ring
165
11
Approx.
234
(Sensor)
25
110
±1
Inlet
54
A B C D
125
1089079.21414.21915.7
150±1
Weight
Approx. 0.7 kg
Approx. 0.7 kg
4-øD hole
Outlet
øB
øA
C
Mounting Bracket (Option Code : /MF1) Weight : Approx. 0.5 kg The external dimensions refer to PH8HF-PP-¨1¨-T-NN–NN, PH8HF- S3-¨1¨-T-NN-NN.
Figure 1.2 Flow-Through Type Holder (with Flange) (2)
1-8
< 1. Specications >
PH8HF - TN - ¨1¨ - T - NN – NN UNIT: mm
ø70
8
ø48.6
210
Model and Code
PH8HF-TN-J10-h-NN-NN
PH8HF-TN-A15-h-NN-NN
6
O-Ring
Approx.
219
160±1
A B C D E
125
1089079.21414.21915.7
(Sensor)
26
76
Inlet
68.5
Approx. 3kg
57.5*
Approx. 3kg
*: With serrations
Washer
Weight
ø34
110±1
C
4-øD hole
Outlet
1
F1.2_3E_TN1.ai
øE
øB
øA
Mounting Hardware (Option Code : /MF1) Weight : Approx. 0.5kg
26
140
75
45
Approx. 70
Approx. 118
2B(O.D. 60.5) Pipe
Figure 1.2 Flow-Through Type Holder (with Flange) (3)
Bracket (Thickness : 3)
Mounting holes for holder
6-ø10 hole
75
70±0.3
45
10
70±0.3
92
Holes Dimension for Wall Mounting
IM 12B07N01-01E
< 1. Specications >
2.1 PH8HF - ¨¨- ¨PT - T - ¨¨ – ¨P, PH8HF - ¨¨- ¨1¨ - T - ¨¨ - ¨P UNIT: mm
1-9
Øa
O-Ring
Ød
Approx. 47
□ Rc 1/2 (Suffix Code : -JP)
□ Rc 1/2 NPT (Suffix Code : -NP)
(pH sensor)
h
Inlet
g
k
Model and Code A Screw a d g h k
PH8HF-PP-JPT-T-□□-□P
PH8HF-S3-JPT-T-□□-□P
PH8HF-PP-NPT-T-□□-□P
PH8HF-S3-NPT-T-□□-□P
Øa
Rc1
Rc1
1NPT
1NPT
80
70
80
70
Approx. 60
Approx. 60
Approx. 60
Approx. 60
Approx. 70
Approx. 70
Approx. 70
Approx. 70
(pH sensor)
Approx. 250
Approx. 245
Approx. 250
Approx. 245
100±1
A Screw
Outlet
110
O-Ring
15
Approx. 1.4kg
17
Approx. 4kg
15
Approx. 1.4kg
17
Approx. 4kg
±1
Weight
4-ØD hole
Ød
Model and Code a d g h k
PH8HF-PP-J10-T-□□-□P
PH8HF-S3-J10-T-□□-□P
PH8HF-PP-A15-T-□□-□P
PH8HF-S3-A15-T-□□-□P
125
125
108
108
BA
90
90
79.4
79.2
O-Ring
110 ±1
h
k
Approx. 47
□ RC 1/2 (Suffix Code : -JP)
□ 1/2 NPT (Suffix Code : -NP)
E
D
C
80
-
19
14
70
-
19
14
80
-
15.7
14.2
70
2
15.7
14.2
Inlet
g
Approx. 60
Approx. 60
Approx. 60
Approx. 60
150
Approx. 70
Approx. 70
Approx. 70
Approx. 70
±1
Approx. 250
Approx. 245
Approx. 250
Approx. 245
Figure 1.2.1 Flow-Through Type Holder (with Jet, Brush Cleaner)
C
Outlet
E
O-Ring
ØB
15
Approx. 1.6kg
17
Approx. 6kg
15
Approx. 1.6kg
17
Approx. 6kg
ØA
Weight
F1.2.1.ai
1-10
F1.2.2.ai
< 1. Specications >
2.2 PH8HF - ¨¨- ¨PT - T - ¨¨ – C¨, PH8HF - ¨¨- ¨1¨ - T - ¨¨ - C¨ UNIT: mm
Øa
(pH sensor)
A Screw
Cable length (I)
(Code: C□)
1m (C1) 3m (C3) 5m (C5) 7m (C6) 10m (C7) 15m (C8) 20m (C9)
Cable weigth; Approx. 0.1kg/m
Mode and Code A Screw a d g h k
PH8HF-PP-JPT-T-
□□-C□
PH8HF-S3-JPT-T-□□-C□
PH8HF-PP-NPT-T-□□-C□
PH8HF-S3-NPT-T-□□-C□
l
Ød
Rc1
Rc1
1NPT
1NPT
Øa
80
70
80
70
O-Ring
Approx. 60
Approx. 60
Approx. 60
Approx. 60
h
g
k
Approx. 70
Approx. 70
Approx. 70
Approx. 70
Inlet
Approx. 250
Approx. 245
Approx. 250
Approx. 245
(pH sensor)
100±1
15
Approx. 1.5kg
17
Approx. 4.1kg
15
Approx. 1.5kg
17
Approx. 4.1kg
Outlet
110 ±1
Weight
4-ØD hole
Ød
Cable length (I)
(Code: C□)
O-Ring
110 ±1
h
Inlet
g
1m (C1) 3m (C3)
k
5m (C5) 7m (C6) 10m (C7) 15m (C8) 20m (C9)
l
Cable weigth; Approx. 0.1kg/m
Model and Code
PH8HF-PP-J10-T-□□-C
PH8HF-S3-J10-T-□□-C□
PH8HF-PP-A15-T-□□-C□
PH8HF-S3-A15-T-□□-C□
D
C
BA
125
125
108
108
90
90
79.4
79.2
14
14
14.2
14.2
19
19
15.7
15.7
□
a d g h k
E
80
-
-
-
2
70
80
70
Approx. 60
Approx. 60
Approx. 60
Approx. 60
Approx. 70
Approx. 70
Approx. 70
Approx. 70
Figure 1.2.2 Flow-Through Type Holder (with Ultrasonic Cleaner)
150±1
Approx. 250
Approx. 245
Approx. 250
Approx. 245
Outlet
E
C
Weight
15
Approx. 1.7kg
17
Approx. 6.1kg
15
Approx. 1.7kg
17
Approx. 6.1kg
ØB
ØA
IM 12B07N01-01E
< 1. Specications >
3. PH8HFF - ¨¨ - ¨PT - T - ¨¨ - JS UNIT: mm
1-11
O-Ring
Approx. 95
Ød
Øa
b
c
74
28
165
G 3/4(Wiring hole)
42 69
Ø80
(pH sensor)
h
g
□ Flameproof Packing Adaptor
Ø21.7
100
(Code : /PG2)
Approx. 231
Model and Code A Screw a b c d e f g h
PH8HFF-PP-JPT-T-□□-JS
PH8HFF-S3-JPT-T-□□-JS
PH8HFF-PP-NPT-T-□□-JS
PH8HFF-S3-NPT-T-□□-JS
Rc1
Rc1
1NPT
1NPT
80
70
80
70
9
10
9
10
6
11
6
11
60
25
30
60.5
26
26
60
25
30
60.5
26
26
e
Inlet
f
70
69
70
69
100±1
Approx. 250
Approx. 245
Approx. 250
Approx. 245
A Screw
Outlet
110 ±1
Weight
Approx. 3kg
Approx. 5.6kg
Approx. 3kg
Approx. 5.6kg
□ Mounting Bracket (Option Code : /MF1) Weight : Approx. 0.5 kg
Bracket(Thickness : 3)
Mounting holes for holder
26
75
45
2B(O.D. 60.5) Pipe
Approx. 82
Approx. 130
75
140
45
70±0.3
92
Holes Dimension for Wall Mounting
Figure 1.3 Flow-Through Type Holder (with Fameproof type Ultrasonic Cleaner)
6-Ø10 holes6-Ø10 holes
70±0.3
10
1-12
< 1. Specications >
4. PH8HFF - ¨¨ - ¨1¨ - T - ¨¨ - JS UNIT: mm
O-Ring
Approx. 95
Ød
Model and Code a b c d e f g h
PH8HFF-PP-J10-T-□□-JS
PH8HFF-S3-J10-T-□□-JS
PH8HFF-PP-A15-T-□□-JS
PH8HFF-S3-A15-T--□□-JS
Øa
h
(pH sensor)
e
110 ±1
Inlet
g
f
150±1
b
c
74
28
165
G3/4 (Wiring hole)
42 69
Ø80
□ Flameproof Packing Adaptor
Ø21.7
100
(Code : /PG2)
Approx. 231
A B C D E
80
9
11
60
60.5
60
60.5
25
26
25
26
30
26
30
26
70
Approx. 250
69
Approx. 245
70
Approx. 250
69
Approx. 245
125
125
108
108
90
90
79.4
79.2
14
14
14.2
14.2
19
19
15.7
15.7
-
70
10
9
10
6
11
6
-
80
-
70
2
Outlet
E
C
Approx. 3.2kg
Approx. 7.6kg
Approx. 3.2kg
Approx. 7.6kg
4-ØD hole
ØA
ØB
Weight
□ Mounting Bracket (Option Code : /MF1) Weight : Approx. 0.5 kg
26
75
45
2B(O.D. 60.5) Pipe
Approx. 82
Approx. 130
Figure 1.4 Flow-Through Type Holder (with Fameproof type Ultrasonic Cleaner)
Bracket (Thickness : 3)
Mounting holes for holder
75
140
45
70±0.3
92
Holes Dimension for Wall Mounting
6-Ø10 holes
70±0.3
10
IM 12B07N01-01E
< 1. Specications >
5. Solenoid Valve UNIT: mm
1-13
General Purpose Solenoid Valve
PH8MV*D
Explosionproof Solenoid Valve
PH8MVF*B
95
103
70
4672
102
146.5
14.5
71
Cautions on Installation of Solenoid Valve for Jet / Brush Cleaning
1. Do not allow a sample solution to flow backward into the solenoid valve or to be replaced with the driving fluid. For this take relevant measures; e.g. install a check valve to prevent inverse pressure between the inlet and outlet of the solenoid valve, or install the solenoid valve higher than the holder, especially when using the air jet/brush cleaning system.
2. Make sure to avoid the risk of corrosion of the solenoid body (bronze) and seal (nitrilel rubber) by vapor or gaseous components generated from a sample solution, especially when using the air jet/brush cleaning system.
2-Rc1/2
G1/2
90
2-Rc1/2
14
G1/2
Figure 1.5 Solenoid Valve for Jet & Brush Cleaning
64
F1.5.ai
Blank Page
< 2. Installation, Piping and Wiring >

2. Installation, Piping and Wiring

2.1 Holder Installation

2.1.1 Installation Site

Install the ow-through type holder in a site where the holder can be easily maintained.

2.1.2 Mounting the Flow-through Type Holder

When strong piping - e.g. process piping - is next to the holder, mount the holder on it as shown in Figure 2.1.
When a polypropylene holder is used, be careful not to apply excessive force to it.
Outlet Outlet
2-1
Inlet Inlet
F2.1E.ai
Figure 2.1 Support by Process Piping
If the process piping is not strong enough to mount the holder, use mounting hardware (available as option) to mount the holder on a vertical (or horizontal) pipe with su󰀩cient strength as shown in Figure 2.2. The holder can be mounted on a bracket as shown in Figure 2.3 (remove unnecessary parts from the metal ttings).
Sensor Mounting Nut
Flow-Through Type Holder
Stanchion
Figure 2.2 Pipe Mounting
F2.2E.ai
2-2
Sensor Mounting Nut
Figure 2.3 Bracket Mounting
< 2. Installation, Piping and Wiring >

2.2 Process Piping

Flow-Through Type Holder
Bracket
70 mm
2-M6
F2.3E.ai
Piping (through which the process uid ows) connected to the holder: The process piping should be installed as per specications, and the temperature, pressure and ow rate of process uid conforms to the specications of the sensor and holder to be used. When a holder with jet or brush cleaning is used, the piping should be installed accordingly. You should also keep “ease of maintenance” and “calibration with standard solution” in mind when installing the piping.

2.2.1 Main Precautions for Piping

(1) When a holder with jet or brush cleaning is used:
The cleaning uid (water or air) is at higher pressure than the process uid. If you want to
prevent water or air owing up line, a check valve should be provided as shown in Figure
2.4.
Note
For safety’s sake you should conrm that it is safe for the cleaning uid to ow into the down-line piping.
Flow Outlet
Check Valve
Figure 2.4 Check Valve Installation
IM 12B07N01-01E
Flow Inlet
Jet or Brush Cleaning
F2.4E.ai
< 2. Installation, Piping and Wiring >
105
(2) When a polypropylene holder is used:
Keep the temperature and pressure of the process uid (pressure of the cleaning uid for
holders with jet or brush cleaning) within the range shown in Figure 2.5.
100
2-3
80
60
(°C)
40
20
Temperature
0 100
Stainless Steel
Polypropylene (or Stainless Steel)
200 300
Pressure (kPa)
400 500
F2.5E.ai
Figure 2.5 Temperature and Pressure Diagram for Polypropylene Resin Holder
(3) When a general use sensor with KCl, solution tank is used:
The pressure of the process uid inside the holder should not exceed the tank head
pressure 10 kPa (0.1 kg/cm
General Type Reserve Tank
2
G).
Ht > Hm
KCl Filling Type Sensor
At Least 1 m
KCl Head Pressure Ht
Solution Head Pressure Hm
Inlet
F2.6E.ai
Figure 2.6 Relationship between the Solution Pressure, Pressure and Reserve Tank Height
2-4
< 2. Installation, Piping and Wiring >
(4) When a sensor with medium pressure KCl, solution tank is used:
Provide stop valves in the up-line and down-line piping adjacent to the holder.
Stop Valve
Stop Valve
Figure 2.7 Stop Valve Installation

2.2.2 Piping Procedure

Piping Materials:
Use the materials shown below for the process piping adjacent to the ow-through type holder.
• Hard polyvinylchloride pipe Nominal diameter 25 mm
• Polypropylene pipe Nominal diameter 25 mm
• Wire rainforced soft polyvinylchloride pipe Nominal diameter 25 mm
• Stainless steel pipe (JIS G3459)
SUS304 or SUS316 Nominal diameter 25 mm
PipingExample:
F2.7E.ai
1. The outlet tube should be as short as possible to expel the solution to atmosphere.
Flowmeter Flowmeter
Figure 2.8 Sensor with General Type Reserve Tank
2. When a horizontal outlet tubing is long, a vertical tube (H) should also be long.
H
F2.8E.ai
IM 12B07N01-01E
< 2. Installation, Piping and Wiring >
2-5
1. Install stop valves upstream and downstream of the flow-through holder to allow ease of maintenance.
Solenoid
Stop Valve
Flowmeter
Stop Valve
Figure 2.9 When the Solution has a Pressure
Valve
2. Install a check valve before the flow-through holder as necessary.
Process Piping
Check
Valve
Cleaning Piping
Stop
Valve
Stop
Valve
Drain Piping
F2.9E.ai
Flow-Through Holder
Drain Pan
F2.10E.ai
Figure 2.10 Cleaning the Flow-Through Holder

2.3 Installing the Sensor

Refer to the separate manual describing the sensor to be used.

2.4 Cleaner Piping

This section applies only to the submersion type holder with cleaner.

2.4.1 Piping Precautions

(1) Provide a slight slack in a exible tubing between the cleaner and a mating device to allow
ease of maintenance.
(2) Determine the cleaner pipe size to allow su󰀩cient ow and pressure. Use nominal 15
mm pipe for air cleaning piping. If the water/jet cleaner pipe or water/brush cleaner pipe is subject to freezing temperature during winter, cover it with a suitable insulation material.
(3) Use a normally-open (opens when relay is energized) nominal 15 mm diameter solenoid
valve for the cleaning line. The solenoid valve supplied by Yokogawa meets the following specications.
2-6
< 2. Installation, Piping and Wiring >
[Model PH8MV Solenoid Valve]
Pilot kick operated, 2-port valve. Open when energized.
Fluid: Normal tap water, industrial water, or air.
Operating Pressure: 0 to 1 MPa
Forward (reverse) Pressure Resistance: 2 MPa
Fluid Temperature: Water; 5 to 60°C, Air; -10 to 60°C
Cv: 4.5
Process Connection: Rc 1/2
Power Supply: 100/110/200/220 V AC, 50/60 Hz
Power Consumption: 10 W
Construction: IP53
Material: Body; Bronze
Sealing; Nitrile rubber
Ambient Temperature: Maximum 50°C
Cable Inlet Connection: G 1/2
Weight: Approx. 0.9 kg
[ModelPH8MVFExplosionproofSolenoidValve]
Pilot kick operated, 2-port valve. Open when energized.
Fluid: Normal tap water, industrial water, or air.
Operating Pressure: 0.05 to 1 MPa
Forward (reverse) Pressure Resistance: 1.5 MPa
Fluid Temperature: Water; 5 to 60°C, Air; -10 to 60°C
Cv: 4.5
Process Connection: Rc 1/2
Power Supply: 100V AC, 50/60 Hz., 110V AC, 60 Hz
200V AC, 50/60 Hz., 220V AC, 60 Hz
Power Consumption: 10 W
Construction: TIIS ameproof (for d2G4 gas).
Material: Body; Bronze
Seal; Nitrile rubber
Ambient Temperature: Maximum 50°C
Valve Seat Leakage: 300 Nml/min. (At air pressure 50 to 700 kPa )
Cable Inlet Connection: G 1/2 (Frameproof packing adaptor)
Mounting Position: Vertical mounting with coil in top
Weight: Approx. 1.9 kg
IM 12B07N01-01E
< 2. Installation, Piping and Wiring >
Drive Signal
Drive Signal

2.4.2 Piping Procedure

(1) Air piping examples
To Wash Cycle Timer
Solenoid Valve*
1
Regulator
Supply Air
2-7
Nominal 15 mm Hard Pipe
Pressure 200 kPa (2 kg/cm Minimum
Nominal 16 mm Wire-Reinforced Vinyl Tube*
Notes: *1 If corrosive gas is produced at the measuring site, consider using a corrosion-resistant solenoid valve. *2 If the solution temperature is high, use a high temperature resistant solenoid valve.
Figure 2.11 Typical Brush/jet Cleaner Air Piping
(2) Industrial water piping examples
To Wash Cycle Timer
Solenoid Valve
Pressure 200 kPa (2 kg/cm Minimum
Ball Valve
Nominal 15 mm Hard Pipe
Nominal 16 mm Wire- Reinforced Vinyl Tube
2
Industrial Water
F2.12E.ai
2
)
F2.11E.ai
2
)
Figure 2.12 Industrial Water Piping for Typical Brush/Jet Cleaner
(3) Tap water piping examples
*
Drive Signal
Float Valve
Nominal 16 mm Wire-Reinforced Vinyl Tube
Pump
Cleaning Water Tank
Check
Valve
Note: *: When using a Model PH8PU1 cleaner pump and tank, set the solution pressure to 10 kPa (0.1 kg/cm
Figure 2.13 Tap Water Piping for Typical Brush/Jet Cleaner
2
) or below.
To Wash Cycle Timer
Tap Water
Drain
F2.13E.ai
2-8
< 2. Installation, Piping and Wiring >

2.4.3 Installation of PH8PU1 Washer Pump and Water Tank

The PH8PU1 Washer Pump and Tank are used to provide water jet and brush cleaning in drinking water applications. For details, refer to the separate IM 19C1E1-01E on PH8PU1 Washer Pump and Tank.

2.5 Wiring

This section describes the wiring between the ultrasonic oscillator and cleaner, and between the solenoid valve, pump, and PH201G distributor. For the sensor wiring, refer to the chapter describing the sensor.

2.5.1 Ultrasonic Oscillator Circuit Wiring

For the non-explosionproof ultrasonic oscillator, connect the cable from the cleaner directly to the terminals inside the PUS400G Ultrasonic Oscillator.
For details of PUS400G, refer to the separate IM 19C1B3-01E.
For the explosionproof ultrasonic oscillator, connect the cable from the cleaner directly to the terminals inside the PH8USF Ultrasonic Oscillator and PH8AL Alarm Box.
For detailsof PH8USF, PH8AL, refer to the separate IM 12B5U2-E.

2.5.2 Solenoid Valve Circuit Wiring

This is the wiring for the water jet or brush cleaning.
The wash timer in the Intelligent pH transmitter outputs a contact signal via the PH201G Distributor. You should wire this contact to operate the solenoid valve. If you are using the PH8PU1 Washer Pump and Tank, then the wiring is described in Sec. 2.5.3.
Solenoid Valve
General-purpose Solenoid Valve
Figure 2.14 Wiring the Solenoid Valve Circuit
Explosionproof Solenoid Valve
PH201G Distributor
Washing contact
Signal Terminals
Power supply
F2.14E.ai
IM 12B07N01-01E
< 2. Installation, Piping and Wiring >
[Non-explosionproofsolenoidvalve]
Use a 2-conductor vinyl-sheathed cable with an outer diameter of 10 to 12 mm for the wiring.
[Explosionproofsolenoidvalve]
When the PH8MVF explosionproof solenoid valve is used, use tapped (screw-in) explosionproof conduit for wiring.

2.5.3 Wiring for PH8PU1 Washer Pump and Tank

Figure 2.15 shows the internal and external wiring for the PH8PU1 Washer Pump and Tank.
2-9
Terminal Box
Spark Killer
Solenoid Actuator
1
3 5 13 A
2 4 6
2 6 95
A1 A2 L1 L2 G
14 B
96
98
For 100 V AC wiring
Terminal box in field
6 2 G
For 200 V AC wiring
U1
U2
V1
V2
V2
U2
V1
U1
X
Pump
M
Y
G
Y
E
Pump
M
X
G
E
Terminal box in field
Ground
contact signal
Pump PowerDistributor "wash"
F2.15E.ai
Figure2.15 InternalandexternalwiringforthePH8PU1WasherPumpandTank
As shown in the gure, connect terminals "A1" and "L1" from the PH201G distributor to terminals A1 and L1 in the terminal box, and connect the power supply to operate the pump between terminals L1 and L2. Also connect together terminals A2 and L2 as shown in the gure. Be sure to ground the ground terminal G.
Blank Page
< 3. Maintenance/Inspection >

3. Maintenance/Inspection

3.1 Cleaning the Holder

When process uid contains slurry which tends to settle in the holder regularly so that the slurry does not build up. Remove the plug or cleaning element on the holder bottom to clean the holder.
Plug or Cleaning Element
3-1
Nut
F3.1E.ai
Figure 3.1 Plug and Nut

3.1.1 Inspecting the O-ring Seal

The O-ring seal used in the wetted part of the ow-through type holder is made of uorocarbon rubber, which has superior resistance to corrosion - suitable for use with most process uids.
Usually, therefore, no periodic inspection is necessary. When a ow-through holder with ultrasonic cleaner is used, if the process uid enters the ultrasonic cleaner, parts replacement may be required to repair it. Inspect the O-ring seal when checking or repairing the ultrasonic cleaner.
To prevent trouble, replace the O-ring seal periodically - e.g. every two years.
Ultrasonic Vibrator
O-ring
Note: This ultrasonic cleaning element is non-explosionproof type.
Figure 3.2 Ultrasonic Cleaner O-ring
F3.2E.ai
3-2
Loosen
< 3. Maintenance/Inspection >

3.2 Checking the Cleaning Element

This section applies to the ow-through type holder with cleaning element. Check the cleaning element to maintain the ow-through type holder in good operating condition.

3.2.1 Jet Cleaning Element

If the cleaner does not clean the sensor electrode, check if the sensor nozzles are clogged. Use a
0.8 mm diameter wire to remove any material clogging the sensor nozzles.
F3.3E.ai
Figure 3.3 Cleaning the Nozzle Holes

3.2.2 Cleaning the Brush

If the electrode becomes dirty, the brush may be excessively worn. When the brush is worn out, replace it. Insert a screwdriver into the cleaner hole to prevent the rotor from turning, and then turn the brush assembly counterclockwise. The brush can be easily removed from the rotor. See Figure 3.4. When mounting a new brush, reverse the disassembly procedure.
Brush Cleaning Element
To prevent the rotor turning, insert a screwdriver into the hole, then turn the brush assembly.
Figure 3.4 Disassembling the Brush
F3.4E.ai
IM 12B07N01-01E
< 3. Maintenance/Inspection >

3.2.3 Ultrasonic Cleaning Element

For several weeks after starting the operation, check the ultrasonic cleaning element for corrosion. If corroded, replace it with the type most suitable for the measurement solution, selecting from among the element materials: SUS316 stainless steel, titanium and Hastelloy C. If a corroded element is not replaced, the solution may enter the ultrasonic element and cause problems. If this occurs, replace the cleaning element immediately.
[Non-explosionproofultrasoniccleaningelement]
(1) To remove a defective ultrasonic cleaning element, unscrew the cleaning element mounting
screw, so the cleaning element holder can be removed from the screw connector. Move the cleaning element out until the connector appears, and disconnect the vibrator leadwire connector from the holder side connector. See Figure 3.5.
F3.5E.ai
Figure3.5 Non-ExplosionproofCleaningElement
3-3
(2) Check that there is no corrosion around the O-ring sealed surface. It is recommended that
the O-ring be replaced whenever the element cleaned.
(3) Mounting a new ultrasonic cleaning element. After attaching the connector, rotate the
cleaning element two to three turns and store the cable inside the holder. Secure the cleaning element mounting screw. Check the cleaning element material by the marking on the surface of the vibrator element; H for Hastelloy, T for titanium, none for SUS316 stainless steel.
Ultrasonic Cleaning Element
Cleaning Element Mounting Nuts
O-Ring
F3.6E.ai
Figure3.6 Non-ExplosionproofUltrasonicCleaningElement
3-4
[Replacetheexplosionproofcleaningelement]
For replacing the ultrasonic cleaning element, consults with Yokogawa service personnel.
< 3. Maintenance/Inspection >

3.2.4 Maintenance of PH8PU1 Washer Pump and Tank

For details, refer to the separate IM 19C1E1-01E.
IM 12B07N01-01E
Customer Maintenance
Model PH8HF, PH8HFF Flow-Through type Holders
Parts List
PH8HF Non-Explosionproof Type
1
3
2
6
4
5
7
Item Part No. Qty Description
1 ─ 1 O-Ring
K9142QW Fluoro rubber (FKM)
K9319RG for /PF option 2 K9143KM 1 Brush 3 K9143KA 1 Brush Assembly (for brush cleaning)
4 K9143JN 1 Nozzle (for jet cleaning) 5 ─ 1 Vibrator Assembly (for ultrasonic cleaning)
K9143QA Transducer: Stainless Steel
K9143QB Transducer: Titanium
K9143QC Transducer: Hastelloy C
6 ─ 1 O-Ring
K9142QT Fluoro rubber (FKM) for Ultrasonic Cleaning
K9319RD /PF option for Ultrasonic Cleaning
K9142QU Fluoro rubber (FKM) for Jet or Brush Cleaning
K9319RS /PF for Jet or Brush Cleaning
7 ─ 1 O-Ring
K9142QX Fluoro rubber (FKM)
K9319RH for /PF option
All Rights Reserved. Copyright © 1982 Yokogawa Electric Corporation. Subject to change without notice.
CMPL 12B05N01-01E
1st Edition: Nov. 1982 (YK) 4th Edition: Jun. 2016 (YK)
2
PH8HFF Explosionproof Type
1
2
Item Part No. Qty Description
1
2
─
K9142QW
K9319RG
─
K9142QX Fluoro rubber (FKM)
K9319RH for /PF option
1 O-Ring
Fluoro rubber (FKM) for /PF option
1 O-Ring
Stainless Steel Mounting Bracket (Option code: /MF1)
Set part No: K9145LD for option code /MF1
4th Edition: Jun. 2016 (YK)
CMPL 12B05N01-01E

Revision Information

Title : Model PH8HF, PH8HFF Flow-Through Type Holder
Manual No. : IM 12B07N01-01E
Nov. 2018/6th Edition
Added FLXA402 (page i)
Jul. 2016/5th Edition
List of related items: Deletion HA405, HA406, DPA405, DPA406, HF405; Page 1-1 Applicable sensors of PH8HF Flow-through Type Holder: Deletion special pH/ORP sensor; CMPL 12B05N01-01E revised to 4th edition (all revision of P/N).
Nov. 2015/4th Edition
Revision by the version up of GS.; page-i ♦ INTRODUCTION “2. Contents“ Add PH4,OR4 and FLXA202. Delete PH400G, PH100 and PH8PU1; page 1-11 Some revision of solenoid valve of PH8MV and PH8MVF; Page 2-6 Some revision of Specication of PH8MV and PH8MVF; Some revi-
sion of page 5 on CMPL 12B07N01-01E 3rd edition (P/N deletion for explosion-proof type).
Oct. 2011/3rd Edition Page layout changed by InDesign
p.1-1, Some addition of Caution on use, and correction of jet cleaning unit material; p.3-4 to p.3-7 Deletion of procedure for [Replace the explosionproof cleaning element].
i
Dec. 2005/2nd Edition
Some error correction.
Oct. 2004/1st Edition
Newly published.
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