Yokogawa PH450G User Manual

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Yokogawa PH450G User Manual

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

 

4th Edition: Mar. 2012(YK)

 

All Rights Reserved, Copyright © 2007, Yokogawa Electric Corporation

 

IM 12B07C05-01E

iv

 

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

10. SPARE PARTS.........................................................................................................

50

APPENDICES.................................................................................................................

51

Appendix 1, Buffer tables............................................................................................

51

Appendix 2, HART HHT (275/375) menu structure.....................................................

52

Appendix 3, Temperature compensation matrix..........................................................

56

Appendix 4, Control drawing for FM approval.............................................................

57

Customer Maintenance Parts List (for Style: S2)........................

CMPL 12B07C05-02E

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

 

NO.

 

 

NI CL I, DIV 2, GROUPS ABCD

 

T6 FOR Ta -20 to +55°C

 

SEE INSTRUCTION MANUAL

 

TYPE 4X

 

SEE CONTROL DRAWING

 

NFM016-A9 P.1

R

Made in Japan

US

 

N200

 

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.

mA output tolerance: ±0.02 mA of “4-20 mA“

D) Transmission signals

General

: Two isolated outputs of 4-20 mA. DC with common negative. Maximum

 

load 600Ω. Bi-directional HART® digital communication, superimposed

 

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

 

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

 

 

Compensation to Nernst equation

 

 

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,

 

 

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

 

 

touchscreen. Plain language messages in English, German, French,

K)

Shipping details

Spanish, Italian, Swedish ,Portuguese and Japanese.

 

 

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

 

 

: Protection IP66 / NEMA 4X / CSA Type 3S

 

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

 

 

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

 

Acceptable range; 50 Hz ±5%, 60 Hz ±5%

 

Power Consumption; 15 VA

PH450G-D

: Ratings; 12-24 V DC

 

Acceptable range; 10.8 to 26.4 V DC

 

Power Consumption; 10 W

N) Safety and EMC conforming standards

 

 

 

 

 

,

 

 

 

 

 

Safety

: EN 61010-1

 

 

 

 

 

 

 

 

 

 

 

 

 

CSA C22.2 No.61010-1

 

 

 

 

 

 

 

UL 61010-1

 

 

 

 

 

 

 

FM3611 Class I, Div.2, Group ABCD,T6 for Ta -20 to 55ºC

EMC

: EN 61326-1 Class A, Table 2 (For use in industrial locations)

 

EN 61326-2-3

 

 

 

 

 

 

 

EN 61000-3-2 Class A

 

 

 

 

 

 

 

EN 61000-3-3

 

 

 

 

 

 

 

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

 

[Style: S2]

Model

 

Suffix code

Option code

Description

PH450G

-----------------

-----------------

pH / ORP Converter

 

 

 

 

 

 

Power

 

- A

-----------------

AC version (100…240 VAC)

 

 

- D

-----------------

DC version (12…24 VDC)

 

 

 

 

 

 

Type

 

 

- A

-----------------

General purpose version

 

 

 

- U

-----------------

FM version

Mounting Hardware

/UM

Universal mounting kit (panel, pipe, wall)

 

 

 

 

/U

Pipe and wall mounting hardware (*2)

 

 

 

 

/PM

Panel mounting hardware (*2)

 

 

 

Hood

/H5

Awning hood (stainless steel) (*2)

 

Conduit adapter

/AFTG

G1/2 (*2)

 

 

 

 

/ANSI

1/2NPT (*2)

 

 

 

 

/AM20

M20 (*2)

 

 

Tag Plate

/SCT

Stainless steel tag plate (*1)

 

 

 

 

 

 

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)

 

Hood (Option code: /H5, some cutout on the left side cover)

184(7.2")

220(8.66")

 

 

 

 

 

 

 

 

 

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

 

A : For output signal

Adapter

 

 

121.5(4.78")

 

 

 

 

 

 

 

 

 

 

B : For contact input

 

49

Approx.

 

 

 

 

C : For sensor cable

 

(1.93")

55(2.2")

 

 

 

 

 

D : For contact output (S1 and S2)

 

 

 

 

 

 

 

E : For contact output (S3 and S4)

 

 

 

D

E

 

F

F : For power supply

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

G1/2 screw (/AFTG), 1/2 NPT screw (/ANSI)

 

 

Grounding terminal (M4 screw)

M20 screw (/AM20)

 

 

 

 

 

 

Figure 3-1. Housing dimensions and layout of glands

IM 12B07C05-01E

WIRING AND INSTALLATION 3

6

Unit: mm (inch)

min.185 (7.25")

 

")

 

 

min.195(7.75

0

(5.43")

+1

138

138

+1

 

0

 

(5.43")

 

138(5.43")

 

 

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.

 

 

wall mounting

 

80

13

 

(0.51")

 

(3.15")

 

 

 

 

2x Ф6.5

 

 

(0.26")

200

 

 

(7.87")

 

4x Ф10

 

 

 

 

(0.4")

35

(1.38")

 

 

154.5

15

70

(6.08")

(0.6")

(2.75")

 

pipe mounting

pipe mounting

(vertical)

(horizontal)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2" ND. pipe

Figure 3-3. Option /U: wall and pipe mounting diagram

IM 12B07C05-01E

IM 12B07C05-01E

7

WARNING This connector for software must be used only by

Yokogawa’s service personnel. connector for (future) software

 

input

 

terminal

potentio-

block

 

merter

 

 

output

 

terminal

 

block

LCD

 

bracket

protective

 

 

shield

 

bracket

 

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)

output

cables

output

contact

cable

Cables

cables

 

cables

 

 

 

 

 

 

 

 

 

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

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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

 

 

 

 

 

 

 

Unit: mm(inch)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Approx.

Packing

55(2.2") 49

 

(1.93")

G1/2 screw (/AFTG), 1/2 NPT screw (/ANSI)

 

Adapter

M20 screw (/AM20)

Figure 3-5c. Conduit adapter

FRONT GLANDS

 

 

 

 

 

 

 

 

 

REAR GLANDS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Sensor

mA1

output

HART

signals

 

mA2

 

 

Contact input

Power

 

Contact

S1

output

 

 

S2

Contact

S3

output

 

 

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.

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WIRING AND INSTALLATION 3

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WARNING

3-3-3. AC power

 

 

 

 

 

 

 

 

 

 

 

 

 

 

power and terminal N to the zero line. See fig-

 

 

Connect terminal L to the phase line of the AC

Fuse replacement should be performed only by

ure 3-8 for the power ground. This is separated

a qualified service personnel.

from input ground by a galvanic isolation.

See Sec.7. MAINTENANCE, Fuse.

3-3-4. DC power

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Fuse ratings:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Connect terminal 1 to the positive outlet and

Power supply

Fuse type

terminal 2 to the negative outlet.

 

 

 

 

 

 

 

 

 

 

12-24 VDC, 10W max

2A/250V, Slow

This is separated from input ground by a

100-240 VAC, 15VA max 0.5A/250V, Slow

galvanic isolation. The size of conductors

3-3-2. Access to terminal and cable entry

should be at least 1.25 mm2. The overall cable

diameter should be between 6 & 12 mm.

Terminals 1 and 2 are used for the power sup-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ply. Guide the power cables through the gland

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

closed to the power supply terminals. The ter-

2

1

 

 

 

 

 

 

2

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

minals will accept wires of 2.5 mm2 (14 AWG).

-

 

+

 

 

 

 

 

 

 

N

L

 

 

 

 

 

 

 

 

 

 

 

Always use cable finishings if possible.

 

POWER

 

POWER

12-24 V

/10 W

100-240 VAC/15 VA/ 50/60Hz

FUSE: 2A/250 VAC/T

FUSE: 500 mA/250 VAC/T

 

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.

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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.

 

Jumper Settings

 

 

 

 

 

 

 

Application & Sensor Connections

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Normal pH sensors (including FU20).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Glass sensor on Input 1.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reference sensor on Input 2.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Special electrodes using 2 glass sensors.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(e.g. Pfaudler)

13

17

 

 

 

 

 

15

16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ORP (Redox measurement).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Metal sensor on Input 1.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Normal reference on Input 2.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ORP (pH compensated) or rH measurement

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Metal sensor on Input 1.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

pH glass (as reference) on Input 2.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

63

 

Imp

LOW

.

 

Figure 3-9a. Jumper placement for low

Figure 3-9b. Jumper holders in cover

impedance setting

 

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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

 

 

and ORP)

Yellow

for reference electrodes

Blue

for combined sensors with both

 

 

measuring and reference elements

 

 

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.

 

 

 

 

red

 

core

 

 

 

 

blue

 

 

 

 

 

 

shield

 

 

 

 

Coaxial

 

 

 

 

 

 

 

 

 

 

 

 

 

Red

to measuring element

 

 

Blue

to screen (shield)

 

 

The triaxial cable has three connections, (it has an extra white wire termination) these wires are connected:

red blue white

 

 

 

Triaxial

 

 

 

 

Red

to measuring element

Blue

to reference

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)

 

 

 

 

 

 

pH

ORP

pH and ORP

pH and rH

 

 

 

 

 

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

 

 

 

 

 

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

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