Yokogawa SC450 User Manual

User’s

Manual

Model SC450G [Style: S2]

Conductivity / Resistivity

Converter

IM 12D08N05-01E

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.

Measurement setup

 Measure Conductivity only

Configure sensor

 Temperature settings

 Temp. Compensation

 Calibration settings

 Concentration

Enter

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 SC450G 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.

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.

This symbol indicates Direct current.

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 SC450G.....................................................	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, glands and conduit adapter........................................	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............................................................................	10
3-3-6. Switching on the instrument....................................................................	10
3-4. Wiring the contact signals....................................................................................	11
3-4-1. General precautions................................................................................	11
3-4-2. Contact outputs........................................................................................	11
3-4-3. Contact input............................................................................................	11
3-5. Wiring the mA-output signals...............................................................................	11
3-5-1. General precautions................................................................................	11
3-5-2. Analog output signals..............................................................................	11
3-6. Wiring of sensors.................................................................................................	12
3-6-1. Sensor cable connections using junction box (BA10) and .........................
extension cable (WF10)...........................................................................	13

IM 12D08N05-01E

4th Edition: Mar. 2012 (YK)

All Rights Reserved, Copyright © 2007, Yokogawa Electric Corporation

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iv
4. OPERATION OF EXAxt SC450G...............................................................................	15
4-1. Main display functions..........................................................................................	15
4-2. Trending graphics.................................................................................................	15
4-3. Zoom in on details................................................................................................	15
4-3-1. Actual mA1 .............................................................................................	16
4-3-2. Actual mA2 ............................................................................................	16
4-3-3. S1/S2/S3/S4............................................................................................	16
4-3-4. C.C. (factory)...........................................................................................	16
4-3-5. C.C. (adjusted).........................................................................................	16
4-3-6. Temp. comp 1 .........................................................................................	16
4-3-7. Temp. comp 2 .........................................................................................	16
4-3-8. Polarization .............................................................................................	16
4-3-9. Sensor ohms ..........................................................................................	16
4-3-10. Last calibrated at ..................................................................................	16
4-3-11. Calibration due at..................................................................................	16
4-3-12. Projected calibration at .........................................................................	16
4-3-13. HART ID................................................................................................	16
4-3-14. Software revision ..................................................................................	16
4-3-15. HART Device revision...........................................................................	17
4-3-16. Logbook.................................................................................................	17
4.3.17. Trouble shooting ...................................................................................	17
4-4. Information function..............................................................................................	17
4-5. Setup-Calibration & commissioning.....................................................................	17
4-6. Secondaryprimary value display switch.............................................................	17
4-7. Navigation of the menu structure.........................................................................	18
5. MENU STRUCTURE COMMISSIONING...................................................................	20
5-1. Configure sensor .................................................................................................	20
5-2. Temperature setting.............................................................................................	20
5-3. Temperature compensation..................................................................................	20
5-4. Calibration settings...............................................................................................	22
5-5. Concentration.......................................................................................................	22
5-6. mA output setup...................................................................................................	24
5-7. Contact output setup............................................................................................	26
5-8. Fail.......................................................................................................................	28
5-9. Simulate...............................................................................................................	28
5-10. Water for Injection Monitoring (USP 645 and EU 0169)...................................	28
5-11. Input contacts.....................................................................................................	28
5-12. Error configuration..............................................................................................	30
5-13. Logbook configuration........................................................................................	30
5-14. Advanced setup..................................................................................................	32
5-15. Display setup......................................................................................................	34

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6. CALIBRATION............................................................................................................	36
6-1. General................................................................................................................	36
6-2. Cell constant manual............................................................................................	36
6-3. Cell constant automatic........................................................................................	36
6-4. Air (zero) calibration ............................................................................................	36
6-5. Sample calibration................................................................................................	36
6-6. Temperature coefficient calibration......................................................................	36
6-7. Temperature calibration .......................................................................................	37
6-8. Operation of hold function during calibration.......................................................	37
6-9. General comments on SC calibration..................................................................	37
7. MAINTENANCE..........................................................................................................	38
7-1. Periodic maintenance ..........................................................................................	38
7-2. Periodic maintenance of the sensor.....................................................................	38
7-3. Cleaning methods................................................................................................	38
7-4. LCD adjustment...................................................................................................	38
8. TROUBLESHOOTING................................................................................................	40
8-1. General ...............................................................................................................	40
8-2. Calibration check..................................................................................................	40
8-3. Polarization check................................................................................................	40
8-5. Prediction of cleaning needed..............................................................................	40
8-6. Poor calibration technique....................................................................................	40
8-7. Error displays and actions....................................................................................	40
9. QUALITY INSPECTION.............................................................................................	41
10. SPARE PARTS.........................................................................................................	45
APPENDICES.................................................................................................................	46
Appendix 1, Temperature compensation.....................................................................	46
Appendix 2, TDS readings..........................................................................................	50
Appendix 3, Calibration solutions for conductivity.......................................................	51
Appendix 4, Sensor selection for the EXAxt SC450G.................................................	53
Appendix 5, How to enter the cell constant for the SC21¨G, SC8SG, and SC4AJ...55
Appendix 6, HART HHT (275/375) Menu structure.....................................................	56
Appendix 7, Control drawing for FM approval.............................................................	60
Customer Maintenance Parts List (for Style: S2).......................	CMPL 12D08N05-02E
Revision Record...............................................................................................................	i

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1

1. INTRODUCTION AND GENERAL DESCRIPTION

The Yokogawa EXAxt SC450G 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 top of the instrument agrees with your order. Example of the nameplate is shown below.

KCC-REM-

YHQ-EEN257

CONDUCTIVITY /RESISTIVITY TRANSMITTER

MODEL	SC450G
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 Conductivity, Resistivity and/or Concentration in industrial installations. The unit combines simple operation and microprocessor-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/dilution 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 50 metres (150 feet), with a BA10 junction box, and up 10 metres 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.

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DESCRIPTION GENERAL AND INTRODUCTION 1

2

2. GENERAL SPECIFICATIONS OF EXAxt SC450G

A) Inputs specifications: Two or four electrodes measurement with square wave excitation, using max 60m (200ft) cable (WU40/WF10) and cell constants from 0.005 to

50.0 cm-1

B) Input ranges
Conductivity	: 0.000 µS/cm - 2000 mS/cm
Minimum	: 1µS (underrange 0.00 µS x c.c.)
Maximum	: 200 mS (overrange 2000 mS x c.c.)
Resistivity	: 0.0 Ω•cm - 1000 MΩ•cm
Minimum	: 5Ω / c.c. (underrange 0.0 Ω/c.c.)
Maximum	: 1MΩ / c.c. (overrange 1000 MΩ/c.c.)
Temperature
Pt1000	: -20 to 250ºC (0 - 500ºF)
Pt100	: -20 to 200ºC (0 - 400ºF)
Ni100	: -20 to 200ºC (0 - 400ºF)
NTC 8k55	: -10 to 120ºC (10 - 250ºF)
Pb36 (JIS NTC 6k)	: -20 to 120ºC (0 - 250ºF)

C)Accuracy

Conductivity/resistivity : ≤ 0.5 % of reading

Temperature	: ≤ 0.3 ºC (≤ 0.4 ºC for Pt100)
Step response	: ≤ 4 sec for 90% (for a 2 decade step)
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 function	: Linear or non-linear 21-step table for Conductivity/Resistivity,
	concentration or temperature
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 conductivity, resistvity,
	concentration or temperature. Configurable delay time and hysteresis
	: PID duty cycle or pulsed frequency control
	: FAIL alarm
Control function	: On / Off
	: Adjustable damping
	: Expire time

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I) Calibration

J) Logbook

K) Display

L) Shipping details

Package size

Package weight Converter weight

M) Housing

Colour SC450G-A(D)-A SC450G-A(D)-U

	3
Hold	: Contact can be used to signal the HOLD situation.
Fail safe	: Contact S4 is programmed as a fail-safe contact

(*)Note: When contact output current is more than 4 Amps, ambient temperature should be less

than 40 ºC.
F) Contact input	: Remote range switching to 10 times the programmed range.
Contact open	: If impedance > 100 kΩ: Range 1
	(“Programmed range for mA1 output" is "Range 1.”)
Contact closed	: If impedance < 10 Ω: 10 x Range 1
G) Temperature compensation
Function	: Automatic or manual, for temperature ranges mentioned under B
	(inputs).
Reference temp.	: programmable from 0 to 100 ºC or 30 - 210 ºF (default 25 ºC).

H)Compensation algorithm

:According IEC 60746-3 NaCl tables (default).

Two independent user programmable temperature coefficients, from 0% to 3.5% per ºC (ºF) by adjustment or calibration.

Matrix compensation: With conductivity function of concentration and temperature. Choice out of 13 preprogrammed matrixes and 2 100-points user-programmable matrixes.

: Semi-automatic calibration using pre-configured OIML (KCl) buffer tables, with automatic stability check. Manual adjustment to grab sample

: Software record of important events and diagnostic data readily 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, Spanish, Italian, Swedish, Portuguese and Japanese.

: 290 x 300 x 290 mm (L x W x D) (11.5 x 11.8 x 11.5 inch)

: app. 2.5 kg (5.5 lbs) : app. 1.5 kg

: Cast aluminum housing with chemically resistant coating; Polycarbonate cover with Polycarbonate flexible window

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

: IP66 cable glands are supplied with the unit

: 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

N)Power supply

SC450G-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
SC450G-D	: Ratings; 12-24 V DC	Acceptable range; 10.8 to 26.4 V DC
	Power Consumption; 10	W

SPECIFICATIONS GENERAL 2

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O) 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.

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.

P)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% RH at 40 ºC (100 ºF) (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

Model and Suffix Codes				min.
						[Style: S2]
Model					Option code	Description
SC450G -----------------					-----------------	Conductivity/Resistivity 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)

*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).

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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 60 metres (197 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

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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

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7

WARNING This connector for software must be used only by Yokogawa’sconnectorservicefor (future)personnelsoftware.

	input
	terminal
potentio-	block
merter
	output
	terminal
	block
LCD	protective
bracket	shield
	bracket

6 X M20 glands

Note: SC450G-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 Appendix 7, 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.

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WIRING AND INSTALLATION 3

8

3-2-2. Cables, Terminals, glands and conduit adapter

SC450G-A(D)-A

The SC450 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 blind plugs supplied.

SC450G-A(D)-U

The SC450 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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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

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	WARNING	3-3-3. AC power
		Connect terminal L to the phase line of the AC
	Fuse replacement should be performed only by	power and terminal N to the zero line. See fig-
		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

Fuse ratings:

3-3-4. DC power

Connect terminal 1 to the positive outlet and

Power supply

Fuse type

terminal 2 to the negative outlet.

12-24VDC, 10W max

2A/250V, Slow

This is separated from input ground by a

100-240VAC, 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

closest to the power supply terminals. The ter-

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

Always use cable finishings if possible.

2

1

2

1

-

+

N

L

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

32

31

33

42

41

43

250V / 5A

52

51

53

72

71

73

AC / DC

NC

C

NO

NC

C

NO

100VA / 50W

NC

C

NO

NO

C

NC

S1

S2

CONTACTS

S3

S4(fail-safe)

63

66

65

62

61

22

21

11

12

13

14

15

16

SHLD

-

+

-

+

+

-

INNER OUTER INNER OUTER

mA2

mA1

TEMP

ELECTRODE

(+HART)

CONTACT

SENSOR(S)

mA OUTPUTS

REFER TO INSTRUCTION MANUAL FOR CONNECTIONS

SC

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 5-7, 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 5-12 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 (Conductivity, Concentration 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.

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.

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WIRING AND INSTALLATION 3

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3-6. Wiring of sensors

General precautions

Generally, signals from sensors are at low voltage and current level. Thus a lot of care must be taken to avoid interference. Before connecting sensor cables to the converter make sure that following conditions are met:

–the sensor cables are not mounted in tracks together with high voltage and or power switching cables

–only standard sensor cable or extension cable is used

–the converter is mounted within the distance of the sensor cables (max. 10 m) + up to 60m WF10 extension cable.

–the setup is kept flexible at the sensors end for easy insertion and retraction of the sensor in the fitting.

Sensor wiring

Refer to figure 3-9, which includes drawings that outline sensor wiring.

The EXAxt can be used with a wide range of sensor types. The sensor system fall into two categories, the ones that use fixed cables 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.

Figure 3-9. Sensor wiring diagrams

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Other sensor systems

To connect other sensor systems, follow the general pattern of the terminal connections as listed below:

11 and 12: Always used for temperature compensation resistor input. 13 and 14: Normally used for the outer electrode

15 and 16: Used for inner electrode

In case a 4-electrode measuring system will be used, 14 and 16 should be used for the current electrodes. Please ensure that shielded cabling will be used.

In below figure this is shown in a schematic way.

11	12	13	14	15	16	11	12	13	14	15	16
	t						t

3-6-1. Sensor cable connections using junction box (BA10) and extension cable (WF10)

Where a convenient installation is not possible using the standard cables between sensors and converter, a junction box and extension cable may be used. The Yokogawa BA10

junction box and the WF10 extension cable should be used. These items are manufactured to a very high standard and are necessary to ensure that the specifications of the system can be met. The total cable length should not exceed 60 metres (e.g. 5 m fixed cable and 55 m extension cable).

BA10		WF10	EXA TRANSMITTER
		15 Core 16 Screen	/ CONVERTER
15	15
14	14	White Co-axial cable
16	16			11
14	14	14 Overall Screen	11
17	17	13 Core 17 Screen	12	12
13	13
11 12	11 12	Brown Co-axial Cable	13	13
11 Red			14	14
			15	15
12 Blue
				16
			16
			17	17

12 (blue)

		14 (overall screen)
Co-axial cable	15 (core)	13 (core)	Co-axial cable
(white)	16 (screen)	17 (screen)	(brown)

11 (red)

Figure 3-10. Connection of WF10 extension cable and BA10 junction box

WIRING AND INSTALLATION 3

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Extension cable may be purchased in bulk	4.	Strip insulation from the last 3 cm of the
quantities or in pre-finished lengths. In the case		brown, and the white coaxial cores.
of bulk quantities cut to length, then it is neces-
sary to terminate the cable as shown below.	5.	Extract the coaxial cores from the
		braid, and trim off the black (low-noise)
Termination procedure for WF10 cable.		screening material as short as possible.
1. Slide 3 cm of heat shrink tube (9 x 1.5)
over the cable end to be terminated.	6.	Insulate the overall screen and the 2
		coaxial screens with suitable plastic
2. Strip 9 cm of the outer (black) insulating		tubing.
material, taking care not to cut or damage
internal cores.	7.	Strip and terminate all ends with suitable
		(crimp) terminals and identify with
3. Remove loose copper screening, and cut		numbers as shown.
off the cotton packing threads as short as
possible.	8.	Finally shrink the overall heat shrink tube
		into position.

3 cm heat shrink

9 cm

remove insulation

Figure 3-11.a.

3 cm

cotton threads

Figure 3-11.b.
11
12
17
15
16
13
14
Figure 3-11.c.

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