User’s
Manual
Model PH450G [Style: S2]
pH and ORP Converter
IM 12B07C05-01E
4th Edition
Note
This page may be referred to when reading pages where subsequent submenu screens are shown in the text. Connection to the relevant submenu screen is indicated by a doted line with an arrow.
Note that screens in the text are typical examples and actual
screens may differ depending on the set parameters.
Commissioning
Connection to the relevant submenu screen is indicated by a doted line with an arrow.
PREFACE
Electrostatic discharge
The EXAxt converter contains devices that can be damaged by electrostatic discharge. When servicing this equipment, please observe proper procedures to prevent such damage.
Replacement components should be shipped in conductive packaging. Repair work should be done at grounded workstations using grounded soldering irons and wrist straps to avoid electrostatic discharge.
DANGER
Installation and wiring
The EXAxt converter should only be used with equipment that meets the relevant IEC, American or Canadian standards. Yokogawa accepts no responsibility for the misuse of this unit.
CAUTION
The Instrument is packed carefully with shock absorbing materials, nevertheless, the instrument may be damaged or broken if subjected to strong shock, such as if the instrument is dropped. Handle with care.
WARNING
•Do not use an abrasive or organic solvent in cleaning the instrument.
•Do not modify the PH450 converter.
•Substitution of components may impair suitability for Division 2.
Do not remove or replace while circuit is live unless area is know to be non-hazardous. Explosion Hazard – Do not disconnect equipment unless area is known to be nonhazardous.
Do not reset circuit breaker unless power has been removed from the equipment or the area is known to be non-hazardous.
Notice
•This manual should be passed on to the end user.
•The contents of this manual are subject to change without prior notice.
•The contents of this manual shall not be reproduced or copied, in part or in whole, without permission.
•This manual explains the functions contained in this product, but does not
warrant that they are suitable the particular purpose of the user.
•Every effort has been made to ensure accuracy in the preparation of this manual. However, when you realize mistaken expressions or omissions, please contact the nearest Yokogawa Electric representative or sales office.
•This manual does not cover the special specifications. This manual may be left unchanged on any change of specification, construction or parts when the change does not affect the functions or performance of the product.
•If the product is not used in a manner specified in this manual, the safety of this product may be impaired.
Yokogawa is not responsible for damage to the instrument, poor performance of the instrument or losses resulting from such, if the problems are caused by:
•Improper operation by the user.
•Use of the instrument in improper applications
•Use of the instrument in an improper environment or improper utility program
•Repair or modification of the related instrument by an engineer not authorized by
Yokogawa.
Safety and Modification Precautions
•Follow the safety precautions in this manual when using the product to ensure protection and safety of the human body, the product and the system containing the product.
How to dispose the batteries:
This is an explanation about the new EU Battery Directive (DIRECTIVE 2006/66/EC). This directive is only valid in the EU. Batteries are included in this product. Batteries incorporated into this product cannot be removed by yourself. Dispose them together with this product.
When you dispose this product in the EU, contact your local Yokogawa Europe B.V.office. Do not dispose them as domestic household waste.
Battery type: silver oxide battery
Notice:
The symbol (see above) means they shall be sorted out and collected as ordained in ANNEX II in DIRECTIVE 2006/66/EC.
ii
The following safety symbols are used on the product as well as in this manual.
DANGER
This symbol indicates that an operator must follow the instructions laid out in this manual in order to avoid the risks, for the human body, of injury, electric shock, or fatalities. The manual describes what special care the operator must take to avoid such risks.
WARNING
This symbol indicates that the operator must refer to the instructions in this manual in order to prevent the instrument (hardware) or software from being damaged, or a system failure from occurring.
CAUTION
This symbol gives information essential for understanding the operations and functions.
Note!
This symbol indicates information that complements the present topic.
This symbol indicates Protective Ground Terminal
This symbol indicates Function Ground
Terminal (Do not use this terminal as the protective ground terminal.)
This symbol indicates Alternating current.
This symbol indicates Direct current.
Warranty and service
Yokogawa products and parts are guaranteed free from defects in workmanship and material under normal use and service for a period of (typically) 12 months from the date of shipment from the manufacturer. Individual sales organisations can deviate from the typical warranty period, and the conditions of sale relating to the original purchase order should be consulted. Damage caused by wear and tear, inadequate maintenance, corrosion, or by the effects of chemical processes are excluded from this warranty coverage.
In the event of warranty claim, the defective goods should be sent (freight paid) to the service department of the relevant sales organisation for repair or replacement (at Yokogawa discretion). The fol-
lowing information must be included in the letter accompanying the returned goods:
•Part number, model code and serial number
•Original purchase order and date
•Length of time in service and a description of the process
•Description of the fault, and the circumstances of failure
•Process/environmental conditions that may be related to the failure of the device.
•A statement whether warranty or nonwarranty service is requested
•Complete shipping and billing instructions for return of material, plus the name and phone number of a contact person who can be reached for further information.
Returned goods that have been in contact with process fluids must be decontaminated/disinfected before shipment. Goods should carry a certificate to this effect, for the health and safety of our employees. Material safety data sheets should also be included for all components of the processes to which the equipment has been exposed.
iii
TABLE OF CONTENTS |
|
PREFACE |
|
1. INTRODUCTION AND GENERAL DESCRIPTION...................................................... |
1 |
1-1. Instrument check.................................................................................................... |
1 |
1-2. Application.............................................................................................................. |
1 |
2. GENERAL SPECIFICATIONS OF EXAxt PH450G..................................................... |
2 |
3. INSTALLATION AND WIRING..................................................................................... |
5 |
3-1. Installation and dimensions.................................................................................... |
5 |
3-1-1. Installation site........................................................................................... |
5 |
3-1-2. Mounting methods..................................................................................... |
5 |
3-2. Wiring..................................................................................................................... |
7 |
3-2-1. Preparation................................................................................................ |
7 |
3-2-2. Cables, Terminals and glands................................................................... |
8 |
3-3. Wiring the power supply......................................................................................... |
9 |
3-3-1. General precautions.................................................................................. |
9 |
3-3-2. Access to terminal and cable entry......................................................... |
10 |
3-3-3. AC power................................................................................................. |
10 |
3-3-4. DC power................................................................................................. |
10 |
3-3-5. Grounding the housing............................................................................ |
11 |
3-3-6. Switching on the instrument.................................................................... |
11 |
3-4. Wiring the contact signals.................................................................................... |
12 |
3-4-1. General precautions................................................................................ |
12 |
3-4-2. Contact outputs........................................................................................ |
12 |
3-4-3. Contact intput........................................................................................... |
12 |
3-5. Wiring the mA-output signals...................................................................... |
12 |
3-5-1. General precautions................................................................................ |
12 |
3-5-2. Analog output signals.............................................................................. |
12 |
3-6. Wiring the sensor system..................................................................................... |
13 |
3-6-1. Impedance measurement jumper settings.................................................... |
13 |
3-7. Sensor wiring....................................................................................................... |
13 |
3-7-1. Connection cable..................................................................................... |
13 |
3-7-2. Sensor cable connection with special grommet (450G-□-A version)...... |
16 |
3-7-3. Sensor cable connections using junction box (BA10) and extension |
|
cable (WF10)............................................................................................. |
17 |
4. OPERATION OF EXAxt PH450G............................................................................... |
19 |
4-1. Main display functions.......................................................................................... |
19 |
4-2. Trending graphics................................................................................................. |
19 |
4-3. Zoom in on details................................................................................................ |
19 |
4-3-1. Actual mA1.............................................................................................. |
19 |
4-3-2. Actual mA2.............................................................................................. |
19 |
4-3-3. Zero......................................................................................................... |
19 |
4-3-4. Slope........................................................................................................ |
20 |
IM 12B07C05-01E |
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4th Edition: Mar. 2012(YK) |
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All Rights Reserved, Copyright © 2007, Yokogawa Electric Corporation |
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IM 12B07C05-01E
iv |
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4-3-5. Sensor mV............................................................................................... |
20 |
4-3-6. Reference impedance.............................................................................. |
20 |
4-3-7. Last calibrated ........................................................................................ |
20 |
4-3-8. Calibration due......................................................................................... |
20 |
4-3-9. Projected calibration................................................................................ |
20 |
4-3-10. Projected replacement........................................................................... |
20 |
4-3-11. Serial number........................................................................................ |
21 |
4-3-12. Software revision................................................................................... |
21 |
4-3-13. HART Device revision........................................................................... |
21 |
4-3-14. Logbook ................................................................................................ |
21 |
4-4. Information function.............................................................................................. |
21 |
4-5. Setup-calibration & commissioning...................................................................... |
21 |
4-6. Secondary-primary value display switch.............................................................. |
21 |
4-7. Navigation of the menu structure......................................................................... |
22 |
4-8. Setup Concentration mode.................................................................................. |
22 |
5. MENU STRUCTURE COMMISSIONING................................................................... |
24 |
5-1. Sensor setup........................................................................................................ |
24 |
5-2. Measurement setup............................................................................................. |
24 |
5-3. Temperature setting............................................................................................. |
24 |
5-4. Temperature compensation.................................................................................. |
24 |
5-5. Calibration settings............................................................................................... |
26 |
5-6. Impedance setting................................................................................................ |
26 |
5-7. mA output setup................................................................................................... |
28 |
5-8. Contact output setup............................................................................................ |
30 |
5-9. Fail....................................................................................................................... |
32 |
5-10. Simulate............................................................................................................. |
32 |
5-11. Error configuration.............................................................................................. |
34 |
5-12. Logbook configuration........................................................................................ |
34 |
5-13. Advanced setup.................................................................................................. |
36 |
5-14. Display setup...................................................................................................... |
38 |
6. CALIBRATION............................................................................................................ |
40 |
6-1. Calibration check with buffer solutions................................................................. |
40 |
6-2. Manual calibration mode ..................................................................................... |
40 |
6-3. Automatic calibration mode.................................................................................. |
40 |
6-4. Sample calibration mode...................................................................................... |
41 |
6-5. Temperature calibration........................................................................................ |
41 |
6-6. ORP & rH calibration............................................................................................ |
41 |
6-7. Operation of hold function during calibration....................................................... |
41 |
6-8. Contact output setup ........................................................................................... |
41 |
7. MAINTENANCE.......................................................................................................... |
43 |
7-1. Periodic maintenance .......................................................................................... |
43 |
7-2. Periodic maintenance of the sensor..................................................................... |
43 |
7-3. LCD adjustment................................................................................................... |
44 |
IM 12B07C05-01E
v
8. TROUBLESHOOTING................................................................................................ |
45 |
|
8-1. |
General ............................................................................................................... |
45 |
8-2. |
Calibration check.................................................................................................. |
45 |
8-3. |
Predictive maintenance........................................................................................ |
45 |
8-4. |
Error displays and actions.................................................................................... |
45 |
9. QUALITY INSPECTION............................................................................................. |
46 |
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10. SPARE PARTS......................................................................................................... |
50 |
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APPENDICES................................................................................................................. |
51 |
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Appendix 1, Buffer tables............................................................................................ |
51 |
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Appendix 2, HART HHT (275/375) menu structure..................................................... |
52 |
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Appendix 3, Temperature compensation matrix.......................................................... |
56 |
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Appendix 4, Control drawing for FM approval............................................................. |
57 |
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Customer Maintenance Parts List (for Style: S2)........................ |
CMPL 12B07C05-02E |
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Revision Record............................................................................................................... |
i |
IM 12B07C05-01E
vi
1
1. INTRODUCTION AND GENERAL DESCRIPTION
The Yokogawa EXAxt PH450G is a converter designed for industrial process monitoring, measurement and control applications. This instruction manual contains the information needed to install, set up, operate and maintain the unit correctly. This manual also includes a basic troubleshooting guide to answer typical user questions.
Yokogawa can not be responsible for the performance of the EXAxt converter if these instructions are not followed.
1-1. Instrument check
Upon delivery, unpack the instrument carefully and inspect it to ensure that it was not damaged during shipment. If damage is found, retain the original packing materials (including the outer box) and then immediately notify the carrier and the relevant Yokogawa sales office.
Make sure the model number on the nameplate affixed to the side of the instrument agrees with your order. Example of the nameplate is shown below.
KCC-REM-
YHQ-EEN257
PH/ORP TRANSMITTER
MODEL |
PH450G |
SUFFIX |
|
SUPPLY |
|
OUTPUTS |
4-20mA(mA1: +HART) |
AMB. TEMP. |
-20 to +55°C |
STYLE |
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NO. |
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NI CL I, DIV 2, GROUPS ABCD |
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T6 FOR Ta -20 to +55°C |
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SEE INSTRUCTION MANUAL |
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TYPE 4X |
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SEE CONTROL DRAWING |
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NFM016-A9 P.1 |
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R |
Made in Japan |
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US |
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N200 |
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Figure 1-1. Nameplate |
Note! The nameplate will also contain the serial number and any relevant certification marks. Be sure to apply
correct power to the unit, as detailed on the nameplate.
1-2. Application
The EXAxt converter is intended to be used for continuous on-line measurement of pH and/or Redox in industrial installations. The unit combines simple operation and micro- processor-based performance with advanced
self-diagnostics and enhanced communications capability to meet the most advanced requirements. The measurement can be used as part of an automated process control system. It can also be used to indicate operating limits of a process, to monitor product quality, or to function as a controller for a dosing/neutralisation system.
Sensors should normally be mounted close to the converter in order to ensure easy calibration and peak performance. If the unit must be mounted remotely from the sensors, WF10 extension cable can be used, up to a maximum of 60 meters (150 feet), with a BA10 junction box, and up 10 meters standard sensor cable.
The EXAxt is delivered with a general purpose default setting for programmable items (see Chapter 5). While this initial configuration allows easy start-up, the configuration should be adjusted to suit each particular application.
An example of an adjustable item is the type of temperature sensor used. The EXAxt can be adjusted for a number of different types of temperature sensors.
Details provided in this instruction manual are sufficient to operate the EXAxt with all Yokogawa sensor systems and a wide range of third-party commercially available probes.
For best results, read this manual in conjunction with the corresponding sensor instruction manual.
Yokogawa designed the EXAxt converter to withstand industrial environments. It meets all the CE regulatory standards. The unit meets or exceeds stringent requirements (see section 2) without compromise, to assure the user of continued accurate performance in even the most demanding industrial installations.
IM 12B07C05-01E
DESCRIPTION GENERAL AND INTRODUCTION 1
2
2. GENERAL SPECIFICATIONS OF EXAxt PH450G
A) Inputs specs |
: Dual high impedance input (≥ 1012Ω) |
B) Input ranges |
(under referance conditions) |
|
|
pH |
: -2 to 16 pH |
ORP |
: -1500 to 1500 mV |
rH |
: 0 to 100 rH |
Temperature |
|
- Pt1000 |
: -30 to 140ºC |
- Pt100 |
: -30 to 140ºC |
- 350Ω (DKK) |
: -30 to 140ºC |
- 5k1 |
: -30 to 140ºC |
- 6k8 |
: -30 to 140ºC |
- PTC10k |
: -30 to 140ºC |
- NTC 8k55 |
: -10 to 120ºC |
- 3kBalco |
: -30 to 140ºC |
C) Accuracy |
|
pH input |
: ≤ 0.01 pH |
ORP input |
: ≤ 1 mV |
Temperature |
: ≤ 0.3 ºC (≤ 0.4 ºC for Pt100) |
Step response |
: < 4 sec for 90% (pH 7 - pH 4) |
Note on performance specifications |
|
The following tolerance is added to above performance. |
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mA output tolerance: ±0.02 mA of “4-20 mA“ |
|
D) Transmission signals |
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General |
: Two isolated outputs of 4-20 mA. DC with common negative. Maximum |
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load 600Ω. Bi-directional HART® digital communication, superimposed |
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on mA1 (4-20 mA) signal |
Output functions |
: Linear or Non linear (21-step table) output for pH, temperature, ORP or rH |
Control function |
: PID control |
Burnout function |
: Burn up (21.0 mA) or burn down (3.6 mA) to signal failure acc. |
|
NAMUR NE43 |
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Adjustable damping. Expire time |
Hold |
: The mA-outputs are frozen to the last/fixed value during calibration/ |
E) Contact outputs |
commissioning |
|
|
General |
: Four SPDT relay contacts with display indicators |
Switch capacity |
: Maximum values 100 VA, 250 VAC, 5 Amps.(*) |
|
Maximum values 50 Watts, 250 VDC, 5 Amps.(*) |
Status |
: High/Low process alarms, selected from pH, ORP, rH and temperature |
|
Configurable delay time and hysteresis |
|
Failure annunciation |
Control function |
: On/Off, PID duty cycle or pulsed frequency control |
Wash |
: Contact can be used to start manualor interval time wash cycles |
Hold |
: Contact can be used to signal the Hold situation. |
Fail |
: Contact S4 is programmed as fail-safe contact |
(*)Note: When contact output current is more than 4 Amps. ambient temperature should be less than 40ºC.
IM 12B07C05-01E
3
F)Contact input : Remote wash cycle start.
G)Temperature compensation
|
Function |
: Automatic or manual |
|
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Compensation to Nernst equation |
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Process compensation by configurable temperature coefficient, |
H) |
Calibration |
NEN6411 for water or strong acids/bases or programmable matrix |
: Semi-automatic 1 or 2 point calibration using pre-configured NIST, |
||
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US, DIN buffer tables 4, 7 & 9, or with user defined buffer tables, with |
|
|
automatic stability check |
I) |
Logbook |
Manual adjustment to grab sample |
: Software record of important events and diagnostic data readily |
||
J) |
Display |
available in the display or through HART®. |
: Graphical Quarter VGA (320 x 240 pixels) LCD with LED backlight and |
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touchscreen. Plain language messages in English, German, French, |
K) |
Shipping details |
Spanish, Italian, Swedish ,Portuguese and Japanese. |
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Package size |
: 290 x 300 x 290 mm (L x W x D) (11.5 x 11.8 x 11.5 inch) |
|
Package weight |
: app. 2.5 kg (5.5 lbs) |
|
Converter weight |
: app. 1.5 kg |
L) |
Housing |
: Cast aluminum housing with chemically resistant coating; |
|
|
Polycarbonate cover with Polycarbonate flexible window |
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: Protection IP66 / NEMA 4X / CSA Type 3S |
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Colour |
: Silver grey |
|
PH450G-A(D)-A |
: IP66 cable glands are supplied with the unit |
|
PH450G-A(D)-U |
: NEMA 4X close up plugs are mounted in the unused cable entry holes |
|
|
and can be replaced by conduit fittings as required |
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Pipe, Panel or Wall mounting using optional hardware |
Optional conduit adapter
G1/2, 1/2NPT or M20 female
M)Power supply
PH450G-A : Ratings; 100-240 V AC Acceptable range; 90 to 264 V AC
|
Ratings; 50/60 Hz |
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Acceptable range; 50 Hz ±5%, 60 Hz ±5% |
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Power Consumption; 15 VA |
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PH450G-D |
: Ratings; 12-24 V DC |
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Acceptable range; 10.8 to 26.4 V DC |
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Power Consumption; 10 W |
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N) Safety and EMC conforming standards |
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, |
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Safety |
: EN 61010-1 |
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CSA C22.2 No.61010-1 |
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UL 61010-1 |
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FM3611 Class I, Div.2, Group ABCD,T6 for Ta -20 to 55ºC |
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EMC |
: EN 61326-1 Class A, Table 2 (For use in industrial locations) |
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EN 61326-2-3 |
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EN 61000-3-2 Class A |
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EN 61000-3-3 |
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Korea Electromagnetic Conformity Standard |
Installation altitude: 2000 m or less Category based on IEC 61010: II (Note)
Pollution degree based on IEC 61010: 2 (Note)
Note: Installation category, called over-voltage category, specifies impulse withstand voltage.
Category II is for electrical equipment.
Pollution degree indicates the degree of existence of solid, liquid, gas or other inclusions which may reduce dielectric strength. Degree 2 is the normal indoor environment. IM 12B07C05-01E
SPECIFICATIONS GENERAL 2
4
CAUTION
This instrument is a Class A product, and it is designed for use in the industrial environment. Please use this instrument in the industrial environment only.
O)Environment and operational conditions
Ambient temperature : -20 to +55 ºC (-5 - 130 ºF) Storage temperature : -30 to +70 ºC (-20 - 160 ºF)
Humidity |
: 10 to 90% at 40 ºC (100 ºF) RH (non-condensing) |
Data protection |
: EEPROM for configuration data and logbook. Lithium cell for clock |
Watchdog timer |
: Checks microprocessor |
Power down |
: Reset to measurement |
Automatic safeguard: Auto return to measuring mode when touchscreen is untouched for 10 min
Model and Suffix Codes |
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[Style: S2] |
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Model |
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Suffix code |
Option code |
Description |
|
PH450G |
----------------- |
----------------- |
pH / ORP Converter |
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Power |
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- A |
----------------- |
AC version (100…240 VAC) |
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- D |
----------------- |
DC version (12…24 VDC) |
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Type |
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- A |
----------------- |
General purpose version |
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- U |
----------------- |
FM version |
Mounting Hardware |
/UM |
Universal mounting kit (panel, pipe, wall) |
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/U |
Pipe and wall mounting hardware (*2) |
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/PM |
Panel mounting hardware (*2) |
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Hood |
/H5 |
Awning hood (stainless steel) (*2) |
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Conduit adapter |
/AFTG |
G1/2 (*2) |
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/ANSI |
1/2NPT (*2) |
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/AM20 |
M20 (*2) |
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Tag Plate |
/SCT |
Stainless steel tag plate (*1) |
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Notes:
*1 If the tag number is predefined with the purchase, Yokogawa will inscript the tag plate with the specified tag number, and program the tag number in the converter.
*2 Option codes /U, /PM, /H5, /AFTG, /ANSI and /AM20 are not specified for FM version (-U).
IM 12B07C05-01E
5
3. INSTALLATION AND WIRING
3-1. Installation and dimensions
3-1-1. Installation site
The EXAxt 450 converter is weatherproof and can be installed inside or outside. It should, however, be installed as close as possible to the sensor to avoid long cable runs between sensor and converter. In any case, the cable length should not exceed 50 metres (162 feet).
Select an installation site where:
•Mechanical vibrations and shocks are negligible
•No relay/power switches are in the direct environment
•Access is possible to the cable glands
(see figure 3-1)
•The converter is not mounted in direct sunlight or severe weather conditions
•Maintenance procedures are possible
(avoiding corrosive environments)
The ambient temperature and humidity of the installation environment must be within the limits of the instrument specifications.
(See chapter 2).
3-1-2. Mounting methods
Refer to figures 3-2 and 3-3. Note that the EXAxt converter has universal mounting capabilities:
•Panel mounting using optional brackets
•Surface mounting on a plate (using bolts from the back)
•Wall mounting on a bracket (for example, on a solid wall)
•Pipe mounting using a bracket on a horizontal or vertical pipe
Size nominal 50A
Unit: mm (inch)
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Hood (Option code: /H5, some cutout on the left side cover) |
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184(7.2") |
220(8.66") |
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24.5(1") 144(5.67")
20 (0.79")
144(5.67")
72(2.8")
20 (0.79")
M20 cable gland
(When shipped, not installed)
Adapter for Coduit Work (optional) (option code : / AFTG, / ANSI, / AM20)
|
A |
B |
C |
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A : For output signal |
Adapter |
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121.5(4.78") |
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B : For contact input |
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49 |
Approx. |
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C : For sensor cable |
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(1.93") |
55(2.2") |
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D : For contact output (S1 and S2) |
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E : For contact output (S3 and S4) |
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D |
E |
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F |
F : For power supply |
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G1/2 screw (/AFTG), 1/2 NPT screw (/ANSI) |
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Grounding terminal (M4 screw) |
M20 screw (/AM20) |
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Figure 3-1. Housing dimensions and layout of glands
IM 12B07C05-01E
WIRING AND INSTALLATION 3
6
Unit: mm (inch)
min.185 (7.25") |
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") |
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min.195(7.75 |
0 |
(5.43") |
+1 |
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138 |
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138 |
+1 |
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0 |
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(5.43") |
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138(5.43") |
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M6
138 |
M5 |
(5.43") M6
Figure 3-2. Option /PM: panel mounting diagram
(Note) When option code "/UM" is specified, universal pipe/wall/pannel mounting kit are supplied- --same as option code "/U" and "/PM" both specified.
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wall mounting |
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13 |
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2x Ф6.5 |
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200 |
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4x Ф10 |
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35
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15 |
70 |
(6.08") |
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pipe mounting |
pipe mounting |
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(horizontal) |
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2" ND. pipe
Figure 3-3. Option /U: wall and pipe mounting diagram
IM 12B07C05-01E
7
WARNING This connector for software must be used only by
Yokogawa’s service personnel. connector for (future) software
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input |
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terminal |
potentio- |
block |
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merter |
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output |
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terminal |
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block |
LCD |
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bracket |
protective |
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shield |
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bracket |
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6 X M20 glands |
Note: PH450G-A(D)-U
The enclosure is provided with stoppers in stead of M20 cable glands for the unused holes.
These stoppers must be removed and replaced by FM approved conduit fittings in accordance with good installation practice. Also see Appedix 4, Control drawing for FM approval.
Figure 3-4. Internal view of EXAxt wiring compartment
3-2. Wiring
3-2-1. Preparation
Refer to figure 3-4. The relay contact terminals and power supply connections are under the screening (shielding) plate. These should be connected first. Connect the sensor, outputs and HART® communication connections last.
To open the EXAxt 450 for wiring:
1.Loosen the four frontplate screws and swing open the cover.
2.The upper terminal strip is now visible.
3.Remove the screen (shield) plate covering the lower terminal strip.
4.Connect the power supply and contact outputs. Use the three glands at the back for these cables.
DANGER
•Cables that withstand temperatures of at least 70 °C should be used for wiring.
•Wiring work should be performed to meet
IP66 or higher requirements. Tighten four frontplate screws to 1.5 N·m torque.
WARNING
Always place the screen plate over the power supply and contact terminals for safety reasons and to avoid interference.
5.Put back (replace) the screen (shield) plate over the lower terminals.
6.Connect the analog output(s), the sensor inputs, and, if necessary, the HART® wiring and input contact.
7.Use the front three glands for analog output, sensor inputs, contact input and HART® wiring (see figure 3-5).
8.Swing back the cover and secure it with the four screws.
9.Switch on the power. Commission the instrument as required or use the default settings.
CAUTION
Do not turn on power with the touchcsreen pressed, otherwise inaccurate screen positioning will occur. If it occurs, leave the touchscreen unpressed, turn off power then on again. The screen positioning will be accurate.
WIRING AND INSTALLATION 3
8
3-2-2. Cables, Terminals, glands and conduit adapter
PH450G-A(D)-A
The PH450 is supplied with terminals suitable for the connection of finished wires in the size range of 0.13 to 2.5 sq.mm. ( 26 to 14 AWG).
The cable glands supplied will form a tight seal on cables with an outside diameter of 6 to 12 mm (0.24 to 0.47 inches). Unused cable entry holes must be sealed with cable glands including the close up plugs supplied.
PH450G-A(D)-U
The PH450 is supplied with terminals suitable for the connection of finished wires in the size range of 1426 AWG. The cable entry holes are sealed with FM certified plugs. Prior to cable entry the plugs can be removed with allen key size 3/8” The cable conduit fittings can be mounted in the holes of the housing as required. The cable glands supplied with the unit will give a tight seal on cables with outside diameter of 0.24 to 0.47 inches.
High voltage section
Contact |
mA |
Contact |
Input |
Power |
Sensor |
(S1, S2) |
(S3, S4) |
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output |
cables |
output |
contact |
cable |
Cables |
cables |
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cables |
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Suitable for cables with an outside diameter between 6 - 12 mm (0.24 - 0.47”)
Figure 3-5a. Cable glands diagram
Gland nut |
Contents: |
6 X Gland M20
6 X Close up plug
6 X Gland nut M20
6 X O-ring 17.12 X 2.62 EPDM 70° sh.
O-ring
Gland
Close up plug
NOTE: The glands must be installed properly to meet IP66 and NEMA 4X rating. Use close up plug for unused glands.
NOTE: Moisturize O-ring before assembling.
Figure 3-5b. How to install cable glands
IM 12B07C05-01E
9
Adapter for conduit work
When protect the cable with a conduit, replace the M20 cable gland with a cable gland of optional conduit adapter, and set the adapter shown as Figure 3-5c.
Nut |
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Unit: mm(inch) |
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Approx. |
Packing |
55(2.2") 49 |
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G1/2 screw (/AFTG), 1/2 NPT screw (/ANSI) |
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Adapter |
M20 screw (/AM20) |
Figure 3-5c. Conduit adapter
FRONT GLANDS |
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REAR GLANDS |
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Sensor |
mA1 |
output |
HART |
signals |
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mA2 |
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Contact input |
Power |
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Contact |
S1 |
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output |
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S2 |
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Contact |
S3 |
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output |
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S4 |
Figure 3-6. System configuration
3-3. Wiring the power supply
3-3-1. General precautions
Make sure the power supply is switched off. Also, make sure that the power supply is correct for the specifications of the EXAxt and that the supply agrees with the voltage specified on the textplate.
DANGER
1.Install an external switch or circuit breaker to the power supply of the converter.
2.Use an external switch or circuit breaker rated 5A and conforming to IEC 60947-1 or IEC 60947-3.
3.It is recommended that the external switch or circuit breaker be installed in the same room as the converter.
4.The external switch or circuit breaker should be installed within reach of the operator and identified with marking as a power supply switch to the converter.
5.Power lines such as power cables and contact outputs should be fixed securely onto a wall or construction using cable racks, conduit tubing, nylon bands or other appropriate ways. Accidental removal from terminals by pulling may result in electric shock.
Local health and safety regulations may require an external circuit breaker to be installed. The instrument is protected internally by a fuse. The fuse rating is dependent on the supply to the instrument. The 250 VAC fuses should be of the “time-lag” type, conforming to IEC127.
IM 12B07C05-01E
WIRING AND INSTALLATION 3
10 |
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WARNING |
3-3-3. AC power |
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power and terminal N to the zero line. See fig- |
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Connect terminal L to the phase line of the AC |
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Fuse replacement should be performed only by |
ure 3-8 for the power ground. This is separated |
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a qualified service personnel. |
from input ground by a galvanic isolation. |
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See Sec.7. MAINTENANCE, Fuse. |
3-3-4. DC power |
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Fuse ratings: |
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Connect terminal 1 to the positive outlet and |
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Power supply |
Fuse type |
terminal 2 to the negative outlet. |
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12-24 VDC, 10W max |
2A/250V, Slow |
This is separated from input ground by a |
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100-240 VAC, 15VA max 0.5A/250V, Slow |
galvanic isolation. The size of conductors |
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3-3-2. Access to terminal and cable entry |
should be at least 1.25 mm2. The overall cable |
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diameter should be between 6 & 12 mm. |
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Terminals 1 and 2 are used for the power sup- |
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ply. Guide the power cables through the gland |
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closed to the power supply terminals. The ter- |
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minals will accept wires of 2.5 mm2 (14 AWG). |
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N |
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Always use cable finishings if possible. |
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POWER |
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POWER |
12-24 V |
/10 W |
100-240 VAC/15 VA/ 50/60Hz |
FUSE: 2A/250 VAC/T |
FUSE: 500 mA/250 VAC/T |
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DC |
AC |
Figure 3-7. Input and output connections
3-3-5. Grounding the housing
For the safety of the user and to protect the instrument against interference, the housing must always be connected to ground. This has to be done by a large area conductor. This cable can be fixed to the rear of the housing or by using the internal ground connections using a braided wire cable. See figure 3-8.
DANGER
The minimum cross sectional area of the protective grounding wire should be 0.75 mm2.
3-3-6. Switching on the instrument
After all connections are made and checked, the power can be switched on from the power supply. Make sure the LCD display comes on.
After a brief interval, the display will change to the measured value. If errors are displayed or a valid measured value is not shown, consult the troubleshooting section (Chapter 8) before calling Yokogawa.
IM 12B07C05-01E
11
(M4 screw)
2 1
N L
POWER
100-240 VAC/15 VA/ 50/60Hz FUSE: 500 mA/250 VAC/T
AC
(M4 screw)
Figure 3-8-a. External grounding
3-4. Wiring the contact signals
3-4-1. General precautions
The contact output signals consist of volt- age-free relay contacts for switching electrical appliances (SPDT). They can also be used as digital outputs to signal processing equipment
(such as a controller or PLC). It is possible to use multi-core cables for the contact in and output signals and shielded multi-core cable for the analog signals.
3-4-2. Contact outputs
The EXAxt 450 unit’s four contacts (switches) that can be wired and configured to suit user requirements. Contact S4 is programmed as a fail-safe contact. Please refer to section 5-8, Contact output setup for functionality description.
Alarm (limits monitoring)
Contacts configured as “ALARM” can be energized when limits are crossed.
Fail
Contacts configured as “FAIL” will be energized when a fail situation occurs. Some fail situations are automatically signaled by the internal diagnostics (electronics) of the converter.
Others can be configured by the user (see section 5-11 Error Configuration). By pressing the “INFO” button on the main screen the user is given an explanation as well as a remedy for the current fail situation.
Always connect the fail contact to an alarm device such as a warning light, alarm bell or displayed on an annunciator.
Figure 3-8-b. Internal grounding
“ALARM” Contact “FAIL” Contact
Power Off |
NC |
NC |
Power On |
NC |
NC |
Alarm |
NO |
NC |
Fail |
NC |
NO |
Fail and Alarm |
NC* |
NO |
HOLD** |
NC |
NC |
*When a fail situation occurs which is related to the parameter associated with the contact
(pH, ORP, rH or temperature) the contact will go to NC. When the fail situation is not related to the parameter associated with the contact the contact will remain in the state it is currently in.
**Wash cycles do not influence other contacts. When HOLD is enabled during wash, it is HOLD that will set all contacts to NC.
3-4-3. Contact input
It is necessary to use screening/shielding on the input signal cables. Terminal 63 is used to connect the shielding.
3-5. Wiring the mA-output signals
3-5-1. General precautions
The analog output signals of the EXAxt transmit low power standard industry signals to peripherals like control systems or strip-chart recorders (Figure 3-6).
3-5-2. Analog output signals
The output signals consist of active current signals of 4-20 mA. The maximum load can be 600 ohms on each.
It is necessary to use screening/shielding on the output signal cables. Terminal 63 is used to connect the shielding.
WIRING AND INSTALLATION 3
12
3-6. Wiring the sensor system
3-6-1. Impedance measurement jumper settings
Impedance measurement is a powerful diagnostic tool. In order to perform impedance measurements it is important to have a good jumper setting. The table and figure below will guide you to make the right setting.
Note! It is important to decide first which application and which settings are appropriate for the installation. This decision is best done before the jumpers are installed, because the cables will rest on top of the jumpers in their installed positions.
Table 3-1. Impedance measuring jumpers
Figure 3-9a. shows the jumper positions related to the types of measurement stated in Table 3-1.
For Low impedance the Low should be shorted by a jumper. See drawing below.
When shipped, two jumpers are placed in a plastic bag and supplied with the product. Typical setting for pH measurement, 13 is shorted to become a low impedance input. Unused jumpers should be stored in jumper holders in the cover, as shown in Figure 3-9b.
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Jumper Settings |
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Application & Sensor Connections |
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Normal pH sensors (including FU20). |
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Glass sensor on Input 1. |
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Reference sensor on Input 2. |
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Special electrodes using 2 glass sensors. |
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(e.g. Pfaudler) |
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ORP (Redox measurement). |
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Metal sensor on Input 1. |
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Figure 3-9a. Jumper placement for low |
Figure 3-9b. Jumper holders in cover |
impedance setting |
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IM 12B07C05-01E |
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3-7. Sensor wiring
Refer to figure 3-10, which includes drawings that outline sensor wiring.
The EXAxt 450 can be used with a wide range of commercially available sensor types, both from Yokogawa and other manufacturers. The sensor systems from Yokogawa fall into two categories; the ones that use a fixed cable and the ones with separate cables.
To connect sensors with fixed cables, simply match the terminal numbers in the instrument with the identification numbers on the cable ends.
The separate sensors and cables are not numbered, but instead use a color-coding system. The electrodes have a colored band incorporated in the label on the connection cap:
• |
Red |
for measuring electrodes (both pH |
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and ORP) |
• |
Yellow |
for reference electrodes |
• |
Blue |
for combined sensors with both |
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measuring and reference elements |
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in the same body |
• |
Green |
for temperature sensors |
The recommended procedure is to color-code each end of the cables to match the sensors with the color strips provided with each cable. This provides a quick way to identify the ends of the cables belonging to a particular sensor when they are installed.
13
3-7-1. Connection cable
The coaxial cable has two connections.
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red |
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core |
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blue |
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shield |
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Coaxial |
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• |
Red |
to measuring element |
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• |
Blue |
to screen (shield) |
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The triaxial cable has three connections, (it has an extra white wire termination) these wires are connected:
red blue white
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Triaxial |
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• |
Red |
to measuring element |
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Blue |
to reference |
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White |
to screen (shield) |
To connect the other sensor systems, follow the general pattern of the terminal connections as listed below:
Terminal |
Single Measurement (pH or Redox) |
Combined measurement (pH and Redox) |
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pH |
ORP |
pH and ORP |
pH and rH |
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11 |
Temperature 1 |
– |
Temperature 1 |
Temperature 1 |
12 |
Temperature 2 |
– |
Temperature 2 |
Temperature 2 |
13 |
Reference |
Reference |
Reference |
Reference |
14 |
Liquid Earth |
Liquid Earth |
ORP |
ORP |
15 |
pH |
ORP |
pH |
pH |
16 |
Shield of no. 15 |
Shield of no. 15 |
Shield of no. 15 |
Shield of no. 15 |
17 |
Shield of no. 13 |
Shield of no. 13 |
Shield of no. 13 |
Shield of no. 13 |
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Note!
•Secondary value is always temperature. For combined pH and Redox measurement, pH is the primary value and Redox the tertiary value.
•For ORP measurement, temperature is not required for automatic temperature compensation
WIRING AND INSTALLATION 3
IM 12B07C05-01E