YOKOGAWA EXA SC202S User manual

User’s

Manual

Model SC202G (S)

Conductivity and Resistivity

Transmitter

YOKOGAWA

IM 12D7B3-E-E

10th Edition

TABLE OF CONTENTS

PREFACE

CONFIGURATION CHECKLIST FOR SC202

1. INTRODUCTION AND GENERAL DESCRIPTION ..................................................................... 1-1

1-1. Instrument check .................................................................................................................... 1-1

1-2. Application ............................................................................................................................... 1-2

2. SC202 SPECIFICATIONS ............................................................................................................. 2-1

2-1. General Specifications ............................................................................................................. 2-1

2-2. Operating specifications ........................................................................................................... 2-2

2-3. Model and suffix codes ............................................................................................................ 2-3

2-4. Intrinsic safety - common specifications ................................................................................... 2-3

2-5. Connection diagram for power supply ..................................................................................... 2-4

3. INSTALLATION AND WIRING ...................................................................................................... 3-1

3-1. Installation and dimensions ...................................................................................................... 3-1

3-1-1. Installation site ............................................................................................................ 3-1

3-1-2. Mounting methods ..................................................................................................... 3-1

3-2. Preparation .............................................................................................................................. 3-3

3-2-1. Cables, terminals and glands ..................................................................................... 3-3

3-3. Wiring of sensors ..................................................................................................................... 3-4

3-3-1. General precautions ................................................................................................... 3-4

3-3-2. Additional precautions for installations in hazardous areas-Intrinsic safe ..................... 3-4

3-3-3. Hazardous Area-Non-Incendive SC202S-N ................................................................ 3-5

3-4. Wiring of power supply ............................................................................................................ 3-5

3-4-1. General precautions ................................................................................................... 3-5

3-4-2. Connection of the power supply ................................................................................. 3-5

3-4-3. Switching the instrument on ....................................................................................... 3-5

3-5. Sensor wiring ........................................................................................................................... 3-6

3-6. Sensor connection using junction box and extension cable ..................................................... 3-6

3-7. Other sensor systems .............................................................................................................. 3-7

3-7-1. Sensor cable connection using junction box (BA10) and extension cable (WF10) ....... 3-7

4. OPERATION; DISPLAY FUNCTIONS AND SETTING ................................................................. 4-1

4-1. Operator interface .................................................................................................................... 4-1

4-2. Explanation of operating keys .................................................................................................. 4-2

4-3. Setting passcodes ................................................................................................................... 4-3

4-3-1. Passcode protection .................................................................................................. 4-3

4-4. Display examples ..................................................................................................................... 4-3

4-5. Display functions ...................................................................................................................... 4-4

5. PARAMETER SETTING ................................................................................................................ 5-1

5-1. Maintenance mode .................................................................................................................. 5-1

5-1-1. Introduction ................................................................................................................ 5-1

5-1-2. Manual activation of HOLD ......................................................................................... 5-3

5-2. Commissioning mode .............................................................................................................. 5-2

5-2-1. Introduction ................................................................................................................ 5-2

5-2-2. Range ........................................................................................................................ 5-3

5-2-3. HOLD ......................................................................................................................... 5-4

5-2-4. Temperature compensation ........................................................................................ 5-5

5-2-5. Temperature compensation selection ......................................................................... 5-6

5-2-6. Service Code .............................................................................................................. 5-7

IM 12D7B3-E-E

5-3. Service Codes ......................................................................................................................... 5-8

5-3-1. Parameter specific functions ...................................................................................... 5-8

5-3-2. Temperature compensation and measuring functions .............................................. 5-10

5-4. Temperature compensation ................................................................................................... 5-12

5-5. mA Output functions .............................................................................................................. 5-14

5-6. User interface ........................................................................................................................ 5-16

5-7. Communication setup ............................................................................................................ 5-18

5-8. General .................................................................................................................................. 5-18

5-9. Test and setup mode ............................................................................................................. 5-18

6. CALIBRATION ................................................................................................................................ 6-1

6-1. When is calibration necessary .................................................................................................. 6-1

6-2. Calibration procedure .............................................................................................................. 6-2

6-3. Calibration with HOLD active ................................................................................................... 6-3

7. MAINTENANCE .............................................................................................................................. 7-1

7-1. Periodic maintenance for the EXA 202 transmitter ................................................................... 7-1

7-2. Periodic maintenance for the sensor system ............................................................................ 7-1

8. TROUBLESHOOTING .................................................................................................................... 8-1

8-1. Diagnostics .............................................................................................................................. 8-2

8-1-1. Off-line calibration checks .......................................................................................... 8-2

8-1-2. On-line impedance checks ......................................................................................... 8-2

9. USP Water Purity Monitoring ....................................................................................................... 9-1

9-1. What is USP? .......................................................................................................................... 9-1

9-2. What is conductivity measurement according to USP? ........................................................... 9-1

9-3. USP in the SC202? ................................................................................................................. 9-1

9-4. Setting SC202 for USP ............................................................................................................ 9-2

10. SPARE PARTS ........................................................................................................................... 10-1

10-1. Itemized parts list ................................................................................................................. 10-1

11. APPENDIX .................................................................................................................................. 11-1

11-1. User setting for non-linear output table (code 31 and 35) .................................................... 11-1

11-2. User entered matrix data (code 23 to 28) ............................................................................ 11-1

11-3. Matrix data table (user selectable in code 22 ....................................................................... 11-2

11-4 Sensor selection .................................................................................................................. 11-3

11-4-1. General .................................................................................................................. 11-3

11-4-2. Sensor selection ..................................................................................................... 11-3

11-4-3. Selecting a temperature sensor .............................................................................. 11-3

11-5. Setup for other functions ..................................................................................................... 11-3

11-6. User setting table ................................................................................................................. 11-4

11-7. Error codes .......................................................................................................................... 11-6

11-8. Device Description (DD) menu structure ............................................................................... 11-7

11-9. Field Change Order .............................................................................................................. 11-8

12. Test Certificate .......................................................................................................................... 12-1

IM 12D7B3-E-E

PREFACE

WARNING

Electric discharge

The EXA analyzer 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.

Installation and wiring

The EXA analyzer 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.

Although the instrument has a weatherproof construction, the transmitter can be harmed if it becomes submerged in water or becomes excessively wet.

Do not use an abrasive or solvent in cleaning the instrument.

Notice

Contents of this manual are subject to change without notice. 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.

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 organizations 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 organization for repair or replacement (at Yokogawa discretion). The following 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 installation failure of the device

●

A statement whether warranty or non-warranty 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.

IM 12D7B3-E-E

CONFIGURATION CHECKLIST FOR SC202

Primary choices

Measurement

Range

Temperature unit default alternatives

Conductivity Resistivity

0-1000 µS/cm max. 1999 mS°C

Celsius Fahrenheit

reference on page

5.8- 5.9

5.3

5.10- 5.11

Sensor

Cell constant

0.1 /cm any value between 0.08 and 50 5.8-5.9, 6.1- 6.3

Sensor type

2-electrode 4- electrode

Temperature compensator Pt1000 Ni100, Pt100, 8k55, Pb36

5.8- 5.9

5.10-5.11

Choices

Communication

Burn out

Temperature compensation

USP functionality

HOLD during maintenance

Calibration temperature enabled inactive inactive inactive inactive disable HART (R) , PH201*B

HI or LO output on fail

NaCl in water fixed T.C., matrix

5.19

5.14- 5.15

5.12, 5.13, 5.5

9.1, 9.2, 5.17 Fail if USP limits are exceeded

HOLD last value or fixed value 5.17, 5.3- 5.4 adjustment +/- 15 °C 5.11

ZERO calibration

Diagnostics

Cell fouling alarm

Password protection inactive adjustment +/-1 µS/cm hard alarm on hard or soft choices all errors active inactive

Output in Concentration units inactive except E13 inactive linearization of output, w% on LCD

5.9

5.17

5.9 password for different levels 5.17

5.14 - 5.17

menu

SC 01

“range”

SC 11

SC 03

SC 02

SC 10

SC 60- 62

SC 32

SC 20- 28; “temp”

SC 57

“hold”, SC 50

SC 12

SC 04

SC 53

SC 05

SC 52

SC 31/35/55

In this manual a sign appears if it concerns the SC202G J-A and SC202S-A/N.

IM 12D7B3-E-E

1-1 Introduction

1. INTRODUCTION AND GENERAL DESCRIPTION

The Yokogawa EXA 202 is a 2-wire transmitter designed for industrial process monitoring, measurement and control applications. This user’s 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 EXA analyzer 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 textplate affixed to the side of the instrument agrees with your order. Examples of nameplates are shown.

MODEL

RANGE

SUPPLY

OUTPUT

AMB.TEMP. [ Ta ]

SERIAL No.

FREELY

24V DC

4 TO 20 mA DC

-10 TO 55 °C

N200

MODEL

SUPPLY

OUTPUT


SERIAL No.

9 TO 32V DC

-10 TO 55 °C

N200

Amersfoort,

The Netherlands

Amersfoort,

The Netherlands

0344

N200

CONDUCTIVITY / RESISTIVITY

TRANSMITTER

MODEL

EXA SC202S

RANGE

SUPPLY

OUTPUT


PROGRAMMABLE

24V DC

4 TO 20 mA DC

-10 TO 55 ºC

SERIAL No.

II 2 (1) G

EEx ib [ia] IIC T4

EEx ib [ia] IIC T6

KEMA 00ATEX1069 X

IS CL I, DIV 1, GP ABCD

0344

N200

CONDUCTIVITY / RESISTIVITY

TRANSMITTER

MODEL

EXA SC202S

SUPPLY

OUTPUT


FISCO 17,5VDC/380mA/5,32W

or

24VDC/250mA/1,2W

FF - TYPE 111

Li=2,6µH Ci=737pF

-10 TO 55 ºC

SERIAL No.

II 2 (1) G

EEx ib [ia] IIC T4

EEx ib [ia] IIC T6 for Ta -10 to 55 ºC for Ta -10 to 40 ºC


0344

N200

CONDUCTIVITY / RESISTIVITY

TRANSMITTER

MODEL

EXA SC202S

SUPPLY

OUTPUT

AMB.TEMP. [Ta]

FISCO 17,5VDC/380mA/5,32W

or

24VDC/250mA/1,2W

PROFIBUS - PA

Li=2,6µH Ci=737pF

-10 TO 55 ºC

SERIAL No.

II 2 (1) G

EEx ib [ia] IIC T4 for Ta -10 to 55 ºC


KEMA 00ATEX1069 X


Ex ia CL I, DIV 1, GP ABCD,

T4 for Ta -10 to 55 ºC

Refer to Installation Drawing

WARNING components may impair intrinsic safety peut compromettre la sècuritè intrinsëque.

Amersfoort,

The Netherlands

Figure 1-1. Nametplate

Ex ia CL I, DIV 1, GP ABCD,


WARNING components may impair intrinsic safety


AVERTISSEMENT

La substitution de composants peut compromettre la sècuritè intrinsëque.

Amersfoort,

The Netherlands

Ex ia CL I, DIV 1, GP ABCD


WARNING components may impair intrinsic safety


AVERTISSEMENT

La substitution de composants peut compromettre la sècuritè intrinsëque.

Amersfoort,

The Netherlands

IM 12D7B3-E-E

Introduction 1-2

NOTE: The nameplate will also contain the serial number and any relevant certification marks. Be sure to apply correct power to the unit.

The first two characters of the serial number refers to the year and month of manufacturing

Check that all the parts are present, including mounting hardware, as specified in the option codes at the end of the model number. For a description of the model codes, refer to Chapter 2 of this manual under General Specifications.

Y = Year M = Month

2000 M January

2001 N February

2002 P March

2003 R April

........ .. .......... ..

2008 W September 9

3

4

1

2

2009 X October O

2010 A November N

Basic Parts List: Transmitter SC202

User’s Manual

Optional mounting hardware when specified (See model code)

2011 B December D

1-2. Application

The EXA transmitter is intended to be used for continuous on-line measurement 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 dangerous limits of a process, to monitor product quality, or to function as a simple controller for a dosing/neutralisation system.

Yokogawa designed the EXA analyzer to withstand harsh environments. The transmitter may be installed either indoors or outside because the IP65 (NEMA4X) housing and cabling glands ensure the unit is adequately protected. The flexible polycarbonate window on the front door of the EXA allows pushbutton access to the keypad, thus preserving the water and dust protection of the unit even during routine maintenance operations.

A variety of EXA hardware is optionally available to allow wall, pipe, or panel mounting. Selecting a proper installation site will permit ease of operation. Sensors should normally be mounted close to the transmitter 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.

The EXA is delivered with a general purpose default setting for programmable items. (Default settings are listed in Chapter 5 and again in Chapter 11). 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 EXA can be adjusted for any one of five different types of temperature sensors.

To record such configuration adjustments, write changes in the space provided in Chapter 11 of this manual. Because the EXA is suitable for use as a monitor, a controller or an alarm instrument, program configuration possibilities are numerous.

Details provided in this user’s manual are sufficient to operate the EXA 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 user’s manual.

Yokogawa designed and built the EXA to meet the CE regulatory standards. The unit meets or exceeds stringent requirements of EN 55082-2, EN55022 Class A without compromise, to assure the user of continued accurate performance in even the most demanding industrial installations.

IM 12D7B3-E-E

2-1 Specifications

2. GENERAL SPECIFICATIONS

2-1. Specifications

A. Input specifications : Two or four electrodes measurement with square wave excitation. Cell constants from 0.008 to 50 cm-1

WU40 sensor cable up to 20m. Up to 60m total using BA10 junction box and WF10 extension cable

B. Detection method : Frequency, read-pulse position and reference voltage are dynamically optimized.

- Matrix : of

: Conductivity function of concen-

tration and temperature. Choice out

5 preprogrammed matrixes and a

25-point user-programmable matrix.

H. Serial Communication

mA

: Bi-directional according to HART digital communication super imposed on the 4-20mA signal.

C. Input ranges

- Conductivity

Minimum

Maximum

: 0.000 µS/cm to 1999 mS/cm at

25 °C (77 °F) reference temperature.

: 0.2 µS x C at process temperature

(underrange 0.000 µS/cm).

: 500 mS x C at process temperature

- Resistivity

Minimum

Maximum

(overrange 550 mS x C).

: 0.000 ∧U - 999 ] U/C at 25 °C

(77 °F) reference temperature.

: 0.002 ∧U/C at process temperature

(underrange 0.000 kΩ x cm).

: 5 ] U/C at process temperature

(overrange 999 MΩ x cm).

- Temperature

Pt1000 : -20 to +250 °C (0 - 500 °F)

Pt100 and Ni100 : -20 to +200 °C (0 - 400 °F)

8K55 NTC : -10 to +120 °C (10 - 250 °F)

Pb36 NTC : -20 to +120 °C (0 - 250 °F)

mA

D. Output Span

- Conductivity

- Resistivity

- Temperature

Sensor type

Pt1000

Pt100, Ni100

: - min 0.01µS/cm

: - max. 1999 mS/cm. (max 90% zero suppression)

: - min 0.001kΩxcm

: - max. 999 ] U x cm. (max 90% zero suppression)

: Dependent on temp. sensor type: min. max.

25 °C (50 °F) 250 °C (500 °F)

25 °C (50 °F) 200 °C (400 °F)

Pb36 NTC, 8k55 NTC 25 °C (50 °F) 100 °C (200 °F)

The instrument is user programmable for linear or non-linear conductivity ranges.

mA

E. Transmission Signal

: Isolated output of 4-20 mA DC .

Maximum load 425 Ω.

Burn up (22 mA) or Burn down

(3.9 mA) or pulse of 22mA to signal failure. See Fig.2-1 and 2-2.

F. Temperature compensation

: Automatic, for temperature ranges mentioned under C (inputs).

- Reference temp. : programmable from 0 to 100 °C or

30 - 210 °F (default 25 °C).

G. Compensation algorithm

-NaCl : According IEC 746-3 NaCl tables

-T.C.

(default).

: Two independent user programmable temperature coefficients, from -0.00%

to 3.50% per °C (°F) by adjustment or calibration.

I. Logbook

J. Display

K. Power supply mA

SC202G

SC202S

Note:

: Software record of important events and diagnostic data. Available through

HART interface.

: Custom liquid crystal display, with a main display of 3

1

/

2

digits 12.5 mm high. Message display of 6 alphanumeric characters, 7 mm high.

Warning flags and units (mS/cm, kΩ.cm, µS/cm and MΩ.cm) as appropriate.

: Nominal 24 volt DC loop powered system.

; up to 40 volts

: up to 31.5 volts

The transmitter contains a switched power supply. The transmitter requires a minimum Power voltage in order to work correctly, which is dependant on the load. Please refer to figures 2-1 and 2-2 for the correct power supply.

1200.0

1000.0

4 mA

22 mA

1100.0

800.0

775.0

600.0

425.0

400.0

200.0

31.5 V

(limit for IS version)

0.0

12 14 16 18 20 22 24 26 28 30 32 34 36 38 40

230.0

Voltage (V)

Fig. 2-1. Supply voltage/ load diagram

17 Volts

14.5 Volts

4 mA 7 mA

Output Current (mA)

Fig. 2-2. Minimum terminal voltage at the SC202

20 mA

IM 12D7B3-E-E

Specifications 2-2

L. Input isolation : 1000 VDC

M. Shipping Details : Package size w x h x d

290 x 225 x 170 mm.

11.5 x 8.9 x 6.7 in.

Packed weight approx. 2.5 kg (5lb).

2-2. Operating specifications

A. Performance

- Accuracy

Performance

: Conductivity

: ≤ 0.5 % ± 0.02 mA

: Resistivity

- Accuracy

Performance

- Accuracy

Performance

- Accuracy

Performance

- NaCl table

- Matrix

: ≤ 0.5 % ± 0.02 mA

: Temperature with Pt1000Ω,

Ni100Ω and Pb36 NTC

: ≤ 0.3 °C ± 0.02 mA

: Temperature with PT100Ω and

8k55Ω

: ≤ 0.4 °C ± 0.02 mA

: Temperature compensation

: ≤ 1 %

: ≤ 3 %

- Ambient influence : ≤ 0.05 %/°C

- Step response : 90 % (< 2 decades) in ≤ 7 seconds

B. Ambient operating temperature

: -10 to +55 o

C (-10 to 130 ºF)

Excursions to -30 to +70 o

C

(-20 to 160 ºF) will not damage the instrument, specification maybe adversely affected

Drift < 500 ppm/°C

C. Storage temperature

: -30 to +70 o

C (-20 to 160 ºF)

G. Data protection

: EEPROM for configuration and logbook, and lithium battery for clock.

H. Watchdog timer

: Checks microprocessor

I. Automatic safeguard : Return to measuring mode when no keystroke is made for 10 min.

J. Operation protection : 3-digit programmable password.

K Regulatory compliance

- EMC

- Emmission

- Immunity

: meets council directive 89/336/EEC

: meets EN 55022 Class A

: meets EN 61000-6-2

L) Intrinsic safety

- ATEX

- CSA

II 2 (1) G

- FM

: EEx ib [ia] IIC T4 for Ta -10 to 55 ºC


KEMA 00ATEX1069 X

: Ex ia CL I, DIV 1, GP ABCD,




SC202S CSA

: IS CL I, DIV 1, GP ABCD



HAZ LOC per Control Drawing

FF1-SC202S-00

D. Humidity

: 10 to 90% RH non-condensing

mA

E. HART specification

- Min. cable diameter : 0.51 mm, 24 AWG

- Max. cable length : 1500 m

Detailed information can be found at: www.hartcomm.org

F. Housing

: Cast aluminium case with chemically resistant coating, cover with flexible polycarbonate window. Case color is off-white and cover is moss green.

Cable entry is via two

1

/

2

” polyamide glands. Cable terminals are provided for up to 2.5 mm

2

finished wires.

Weather resistant to IP65 and NEMA

4X standards. Pipe wall or panel mounting, using optional hardware.

M) Non-Incendive

- FM

- CSA

- ATEX

II 3 G

: NI CL I, DIV 2, GP ABCD



HAZ LOC per Control Drawing

FF1-SC202S-00

: NI CL I, DIV 2, GP ABCD




SC202S CSA

: EEx nA [L] IIC T4 for Ta -10 to 55 ºC

EEx nA [L] IIC T6 for Ta -10 to 40 ºC

KEMA 00ATEX1070 X

N. DD specification : The SC202 Device Description is available enabling communications with the Handheld Communicator

(HCC) and compatible devices.

2-3. Model and suffix codes

Model Suffix Code Option code Description

SC202G Conductivity Transmitter, General Purpose version

SC202S

Type - A

Conductivity Transmitter, Intrinsic Safe version

Milli-amp (+HART) version

- D

- P

- F

- N

Non incendive profibus PA version profibus PA version

FOUNDATION ® Fieldbus version

Non-Incendive Milli-amp (+HART) version

Options

- B

- E

/H

/U

/SCT

/Q

Non-Incendive FOUNDATION ® Fieldbus version

Always E

Hood for Sun Protection

Pipe & Wall mounting hardware

Stainless steel tagplate

Calibration certificate

IM 12D7B3-E-E

2-3 Specifications

+ _

IM 12D7B3-E-E

+ _

+ _

- Supply and output circuit (terminals + and -): Maximum input voltage U Maximum input power Pi = 1.2 W Effective internal capacitance - Sensor input circuit (terminals 11 through 16): Maximum output voltage U

Model EXA SC202S-F Model EXA SC202S-P

Specifications 2-4

IM 12D7B3-E-E

2-5 Specifications

Remarks : Model EXA SC202S-A Model EXA SC202S-N

+ _

+ _

+ _

- Supply and output circuit (terminals + and -) Maximum input voltage V - Sensor input circuit (terminals 11 through 16): Maximum output voltage V

Remarks : Model EXA SC202S-F Model EXA SC202S-B Model EXA SC202S-P Model EXA SC202S-D

Specifications 2-6

IM 12D7B3-E-E

2-7 Specifications

Remarks : Model EXA SC202S-A No revision to drawing without prior FM Approval

+ _

+ _

IM 12D7B3-E-E

+ _

Electrical data of the EXA SC202S : - Supply circuit (terminals + and -):

Remarks : Model EXA SC202S-N No revision to drawing without prior FM Approval

Specifications 2-8

+ _

+ _

Electrical data of the EXA SC202S : - Supply circuit (terminals + and -): 501.4(B) of the National Electrical Code (ANSI/NFPA 79). Nonincendive field wiring may be installed in accordance with A

IM 12D7B3-E-E

2-9 Specifications

Remarks : Model EXA SC202S-F Model EXA SC202S-P No revision to drawing without prior FM Approval

IM 12D7B3-E-E

Remarks : Model EXA SC202S-F Model EXA SC202S-P No revision to drawing without prior FM Approval

Specifications 2-10

IM 12D7B3-E-E

2-11 Specifications

Remarks : Model EXA SC202S-B Model EXA SC202S-D No revision to drawing without prior FM Approval

IM 12D7B3-E-E

Specifications 2-12

IM 12D7B3-E-E

3-1 Installation and wiring

3. INSTALLATION AND WIRING

3-1. Installation and dimensions

3-1-1. Installation site

The EXA transmitter 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 transmitter. In any case, the cable length should not exceed 60 meters (200 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 transmitter 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 EXA transmitter has universal mounting capabilities:

●

Panel mounting using two (2) self-tapping screws

●

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 (maximum pipe diameter 50 mm)

162 (6.4)

min. 203

(min. 8.0)

154

(6.06)

30 (1.18)

30 (1.2)

92 (3.6)

115 (4.5)

1/2" SUPPLY

56±0.2

(2.20)

1/2" INPUT

M6 bolts (2x)

CUT-OUT DIMENSION

2x ø4

(0.16)

SPACING PANEL

CUT-OUT DIMENSIONS

Fig. 3-1. Housing dimensions and layout of glands

Fig. 3-2. Panel mounting diagram

IM 12D7B3-E-E

Installation and wiring 3-2 wall mounting pipe mounting pipe mounting

(vertical) (horizontal)

56

(2.20)

2x ø6.5

(0.26)

4x ø10

(0.4)

70

(2.75)

92 (3.6)

115 (4.5)

2" ND pipe

OPTION /U: Universal pipe/wall mounting

Figure 3-3. Wall and pipe mounting diagram

Figure 3-4. Internal view of EXA wiring compartment

IM 12D7B3-E-E


mA

3-2. Preparation

Refer to figure 3-4. The power/output connections and the sensor connections should be made in accordance with the diagram on page 3-6. The terminals are of a plug in style for ease of mounting.

To open the EXA 202 for wiring:

1. Loosen the four frontplate screws and remove the cover.

2. The terminal strip is now visible.

3. Connect the power supply. Use the gland on the left for this cable.

4. Connect the sensor input, using the gland on the right (see fig. 3-5). Switch on the power. Commission the instrument as required or use the default settings.

5. Replace the cover and secure frontplate with the four screws.

6. Connect the grounding terminals to protective earth.

7. The optional hose connection is used to guide the cables coming from an immersion fitting through a

protective plastic tubing to the transmitter.

3-2-1. Cables, terminals and glands

The SC202 is equipped with terminals suitable for the connection of finished cables in the size range: 0.13 to 2.5 mm (26 to 14 AWG). The glands will form a tight seal on cables with an outside diameter in the range of 7 to 12 mm (9/32 to 15/32 inches).

SENSOR

CABLE GLAND

POWER/OUTPUT

CABLE GLAND

GROUNDING TERMINAL

Figure 3-5. Glands to be used for cabling

IM 12D7B3-E-E

Installation and wiring 3-4

COMPUTER

HAND HELD

COMMUNICATOR

HOLD

YES

>

FAIL MODE

NO

YES NO

ENT

MEASURE

AUT.CAL

MAN.CAL

DISPLAY

TEMP

HOLD

MODE

ENT

YOKOGAWA

OUTPUT/SUPPLY

INPUT

2,5 or 10 m

SENSORS

DISTRIBUTOR

0 1 2

100 1 8 0

Safety Barrier

SC202S only

RECORDER

Figure 3-6. System configuration

3-3. Wiring of sensors

3-3-1. General precautions

Generally, transmission of signals from SC sensors is at a low voltage and current level. Thus a lot of care must be taken to avoid interference. Before connecting sensor cables to the transmitter 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 cables or extension cable are used

– the transmitter is mounted within the distance of the sensor cables (max. 10 m) + up to 50m WF10 extension cable.

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

3-3-2. Additional precautions for installations in hazardous areas - Intrinsic safe

Make sure that the total of capacitances and inductances connected to the input terminals of the EXA

SC202S do not exceed the limits given in the certificate.

This sets a limit to the cable and extensions used.

– The intrinsic safe version of the EXA 202 instrument can be mounted in Zone 1.

– The sensors can be installed in Zone 0 or Zone 1 if a safety barrier according to the limits given in the system certificate is used.

– Ensure that the total of capacitances and inductances connected to the terminals of the EXA SC202 do

not exceed the limits given in the certificate of the safety barrier or distributor.

– The cable used should preferably have a BLUE colour or marking on the outside.

– Installation for (sensors in Zone 0 or 1):

Generally, the distributor with input/output isolation has no external earth connection. If there is an earth connection on the distributor and the external connection of the transmitter is connected to “protective” earth, the shield of the 2-wire cable may NOT be connected to “protective” earth at the distributor too.

IM 12D7B3-E-E

3-5Installation and wiring

3-3-3. Installation in: Hazardous Area-Non-Incendive

The SC202S-N may be installed in a Category 3/ Zone 2/ Div.2 area without the use of safety barriers.

Maximum permissible supply voltage 31.5V

3-4. Wiring of power supply

3-4-1. General precautions

Do not activate the power supply yet. First make sure that the DC-power supply is according to the specifications given.

mA

WARNING DO NOT USE ALTERNATING CURRENT OR MAINS POWER SUPPLY! !

The cable leading to the distributor (power supply) or safety barrier transports power to and output signal from the transmitter. Use a two conductor shielded cable with a size of at least 1.25 mm

2

and an outside diameter of 7 to 12 mm. The cable gland supplied with the instrument accepts these diameters. The maximum length of the cable is 2000 metre, or 1500 metres when using the communications. This ensures the minimum operating voltage for the instrument.

Grounding:

• If the transmitter is mounted on a grounded surface (e.g. a metal frame fixed in the soil) the shield of the

2-wire cable may NOT be connected to ground at the distributor.

• If the transmitter is mounted on a non-conducting surface (e.g. a brick wall) it is recommended to ground the shield of the 2-wire cable at the distributor end.

3-4-2. Connection of the power supply

The terminal strip is accessed as was described in section 3-2-1. Use the left-hand gland to insert the supply/ output cable to the transmitter. Connect the supply to the terminals marked +, - and G as is indicated in figures 3-11.

mA

3-4-3. Switching the instrument on

The terminations of the WU40.LH x x cable are as shown.

11

12

13

14

15

16 white brown green yellow grey pink

5

6

4

1 2

3

Fig. 3-7. Connection diagrams

IM 12D7B3-E-E


3-5. Sensor wiring

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

The EXA SC202 can be used with a wide range of commercially available sensor types if provided with shielded cables, both from Yokogawa and other manufacturers. The sensor systems from Yokogawa 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.

The separate sensors and the WU40-LHhh cables are also numbered, but the numbers do not always match with the terminal numbers in the instrument. Figure 3-9 indicates how to connect the different sensor types.

CONDUCTIVITY / RESISTIVITY TRANSMITTER

11 TEMPERATURE

12 TEMPERATURE

13 CELL

14 CELL

15 CELL

16 CELL

1

2

1

2

BROWN

BROWN

YELLOW / GREEN

RED

11 TEMPERATURE

12 TEMPERATURE

13 OUTER ELECTRODE

14 OUTER ELECTRODE

15 INNER ELECTRODE

16 INNER ELECTRODE

SEPARATE SENSORS WITH WU40-LH . . CABLE

11 TEMPERATURE

12 TEMPERATURE

13 OUTER ELECTRODE

14 OUTER ELECTRODE

15 INNER ELECTRODE

16 INNER ELECTRODE

SC4A... SENSORS WITH INTEGRATED CABLE

Figure 3-9. Sensor wiring diagrams

SX42-SX . . - . F SENSORS

IM 12D7B3-E-E


3-7. Other sensor systems

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

11 and 12

13 and 14

: Always used for temperature compensation resistor input.

: 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 figure 3-10 this is shown in a schematic way.

11 12

13

14 15 16 t

2-electrode configuration

Figure 3-10. Connection diagram for other sensors

11 12

13

14 15 16 t

4-electrode configuration

+ + -

G

HART SUPPLY

11 12 13 14 15 16

SENSOR

Figure 3-11. Terminal identification label

3-7-1. 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 transmitter, 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 are not compromised. The total cable length should not exceed

60 metres (e.g. 5 m fixed cable and 55 m extension cable).

Note: 17 of both WF10 and BA10 do not need to be used.

IM 12D7B3-E-E


11 Red

12 Blue

15 Core 16 Screen

White Co-axial cable

14 Overall Screen

13 Core 17 Screen

Brown Co-axial Cable

WF10 Cable

TRANSMITTER / CONVERTER

11

12

17

13

15

16

14

Thermistor (Temperature sensor)

Secondary Coil

Primary Coil

Ground (Shield)

Brown

A

Screen

Red

C

E

Overall shield

B

White

D

Blue

Fig. 3-12. Connection of WF10 extension cable and BA10/BP10 junction box

NOTE:

See page 3-10 for termination for WF10 cable in combination with EXA SC

>Connections differential 4-electrode

A-15

B-16

C-13

D-14

E-11

F-12

S-3 or 63 temp

IM 12D7B3-E-E


Extension cable may be purchased in bulk quantities, cut to length. Then it is necessary to terminate the cable as shown below.

Termination procedure for WF10 cable.

1. Slide 3 cm of heat shrink tube (9 x 1.5) over the cable end to be terminated.

2. Strip 9 cm of the outer (black) insulating material, taking care not to cut or damage internal cores.

3 cm heat shrink

9 cm remove insulation

Fig. 3-13a.

3. Remove loose copper screening, and cut off the cotton packing threads as short as possible.

4. Strip insulation from the last 3 cm of the brown, and the white coaxial cores.

3 cm cotton threads

Fig. 3-13b.

5. Extract the coaxial cores from the braid, and trim off the black (low-noise) screening material as short as possible.

6. Insulate the overall screen and drain wire (14) and the 2 coaxial screens with suitable plastic tubing.

7. Strip and terminate all ends with suitable (crimp) terminals and identify with numbers as shown.

Red

Blue

Black

11

12

14

White

15

Brown

16

13

17

Fig. 3-13c.

8. Finally shrink the overall heat shrink tube into position.

IM 12D7B3-E-E

Operation 4-1

4. OPERATION; DISPLAY FUNCTIONS AND SETTING

4-1. Operator interface

This section provides an overview of the operation of the EXA operator interface. The basic procedures for obtaining access to the three levels of operation are described briefly. For a step-by-step guide to data entry, refer to the relevant section of this user’s manual. Figure 4-1 shows the EXA operator interface.

LEVEL 1: Maintenance

These functions are accessible by pushbutton through a flexible front cover window. The functions make up the normal day-to-day operations that an operator may be required to complete. Adjustment of the display and routine calibration are among the features accessible in this way. (See table 4-1).

LEVEL 2: Commissioning

A second menu is exposed when the EXA front cover is removed and the display board is revealed. Users gain access to this menu by pressing the button marked

(See table 4-1).

*

in the lower right of the display board. This menu is used to set such values as the output ranges and hold features. It also gives access to the service menu.

LEVEL 3: Service

For more advanced configuration selections, press the button marked

*

, then press “NO” repeatedly until you reach SERVICE. Now push the “YES” button. Selecting and entering “Service Code” numbers in the commissioning menu provide access to the more advanced functions. An explanation of the Service Codes is listed in chapter 5 and an overview table is shown in chapter 11.

mA

Table 4-1. Operations overview

Routine

Maintenance

Commissioning

SET HOLD

TEMP 1 & 2

Service

(Access to coded entries

SERVICE

from the commissioning

level)

CALIB

DISPLAY 1&2

HOLD

OUTPUT

Function

Calibration with a standard solution or sample

Read auxiliary data or set message display

Switch hold on/off (when activated)

Adjust the output range

Activate the hold function

Select method of temperature compensation

Fine tune the specialized functions of the transmitter

5

5

5

5

4

5

Chapter

6

NOTE:

All three levels may be separately protected by a password. See Service Code 52 in chapter 5 Service

Code table for details on setting passwords.

IM 12D7B3-E-E

4-2 Operation

Output hold flag

Fail flag

Menu pointer flags

Units

HOLD FAIL

MODE

Main display

Commissioning function menu

Message display

YES N O

ENT

MEASURE

CAL

DISPLAY

HOLD

OUTPUT

SET HOLD

TEMP.

SERVICE

Key prompt flags

Selection keys

YES : Accept setting

NO : Change setting

Adjustment keys

> : Choose digit to adjust

^ : Adjust digit

ENT : Confirm change

YES

Figure 4-1. SC202 operator interface

NO MODE

ENT

Broken line indicates area that can be seen through front cover

Commissioning mode access key

Measure/Maintenance mode key

4-2. Explanation of operating keys

MODE key This key toggles between the measuring and maintenance modes. Press once to obtain access to the maintenance function menu.

CALIB

DISP 1

DISP 2 - (Only when second temp. compensation enabled)

HOLD - (only when enabled)

Press again to return to the measuring mode (press twice when hold is activated).

YES/NO keys These are used to select choices from the menu.

YES is used to accept a menu selection.

NO is used to reject a selection, or to move ahead to the next option.

DATA ENTRY keys ( mA )

is used as a “cursor” key. Each press on this key moves the cursor or flashing digit one place to the right. This is used to select the digit to be changed when entering numerical data.

is used to change the value of a selected digit. Each press on this key increases the value by one unit. The value can not be decreased, so in order to obtain a lower value, increase past nine to zero, then increase to the required number.

When the required value has been set using the > and ^ keys, press ENT to confirm the data entry. Please note that the EXA does not register any change of data until the ENT key is pressed.

*

key This is the commissioning mode key. It is used to obtain access to the commissioning menu. This can only be done with the cover removed or opened. Once this button has been used to initiate the commissioning menu, follow the prompts and use the other keys as described above.

IM 12D7B3-E-E

Operation 4-3

4-3. Setting passcodes

4-3-1. Passcode protection

In Service Code 52, EXA users can set passcode protection for each one of the three operating levels, or for any one or two of the three levels. This procedure should be completed after the initial commissioning

(setup) of the instrument. The passcodes should then be recorded safely for future reference.

When passcodes have been set, the following additional steps are introduced to the configuration and programming operations:

Maintenance

Press MODE key. The display shows 000 and *PASS*

Enter a 3-digit passcode as set in Service Code 52 to obtain access to the Maintenance Mode

Commissioning

Press

*

key. The display shows 000 and *PASS*

Enter a 3-digit passcode as set in Service Code 52 to obtain access to the Commissioning Mode.

Service

From the commissioning menu, select *Service by pressing YES key. The display shows 000 and *PASS*

Enter a 3-digit passcode as set in Service Code 52 to obtain access to the Service Mode.

NOTE:

See Service Code 52 for the setting of passcodes.

4-4. Display examples

The following pages show the sequence of button presses and screens displayed when working in some standard configurations. More or less options will be made available by the configuration of some service codes, or by choices made in the commissioning menu.

The following deviations are possible:

*

** or matrix.

***

W/W % only appears if switched on in service code 55. In display 2 w/w % never appears.

IM 12D7B3-E-E

mA

4-4 Operation

4-5. Display functions

Display Functions

(Sequence for resistivity function equals this conductivity example).

Actual cell constant

YES NO

µS / c m

NO

Reference temperature

µ S / c m

YES NO

µS / c m

NO

MODE

YES NO

µ S / c m

NO

YES

(See Calibration menu Chapter 6)

Software release number

DISP.1

or

DISP.2

NO

Temperature compensation

YES

YES NO

µ S / c m

NO

NO

YES NO

µS / c m

YES NO

µS / c m

NO

NO

HOLD

NO

YES NO

µ S / c m

YES

YES NO

µ S / c m

w/w %

NO

2nd compensated value

Process temperature

YES NO

µ S / c m

YES

(See Hold menu Chapter 5.1)

Uncompensated if

USP is enabled in serv code 57

FAIL

MODE

YES NO

µ S / c m

NO

YES NO

µ S / c m

NO

YES NO

µ S / c m

NO

YES NO

YES NO

ENT

MEASURE

CAL

DISPLAY

HOLD

OUTPUT

SET HOLD

TEMP.

SERVICE

MODE

ENT

Current output 1

DISP.1

mA

YES NO

µS / c m

Press YES to fix the selected second line of display

IM 12D7B3-E-E

Parameter setting 5-1

5. PARAMETER SETTING

5-1. Maintenance mode

5-1-1. Introduction

Standard operation of the EXA instrument involves use of the Maintenance (or operating) mode to set up some of the parameters.

Access to the maintenance mode is available via the six keys that can be pressed through the flexible window in the instrument front cover. Press the “MODE” key once to enter this dialog mode.

(Note that at this stage the user will be prompted for a passcode where this has been previously set up in service code 52, section 5)

Calibrate : See “calibration” section 6.

Display setting : See “operation” section 4.

Hold : Manually switch on/off “hold” (when enabled in commissioning menu). See adjustment procedure 5-2-3.

5.1.2 Manual Activation of Hold.

mA 5-1-2. Manual activation of Hold

FAIL

MODE

YES NO MODE

ENT

MEASURE

OUTPUT

SET HOLD

TEMP.

SERVICE

MODE

M W .c m

YES N O

CALIBRATE

NO

NO

NO

NO

M W .c m

YES N O

YES

NO

HOLD

M Ω . c m

YES N O

M W .c m

YES N O

YES

HOLD

NO

YES

M Ω . c m

MEASURE

IM 12D7B3-E-E

5-2 Parameter setting

5-2. Commissioning mode

5-2-1. Introduction

In order to obtain peak performance from the EXA SC202, you must set it up for each custom application.

Output ranges : mA output is set as default to 0-1 mS/cm or 0-19.99 MΩ.cm.

For enhanced resolution in more stable measuring processes, it may be desirable to select for example 5-10 µS/cm range.

mA

Hold : The EXA SC202 transmitter has the ability to “HOLD” the output during maintenance periods. This parameter should be set up to hold the last measured value, or a fixed value to suit the process.

Temp1/2 : First and second temperature compensation types and values. (see also section 5-2-4)

* NaCl is the default compensation and is used for neutral salt solutions. Strong solutions of salts are compensated, as are process waters and pure, and ultrapure water.

* TC temperature coefficient compensation uses a linear temperature compensation factor. This can be set by calibration or configuration.

* Matrix compensation is an extremely effective way of compensation. Choose from standard matrix tables, or configure your own to exactly suit your process.

: This selection provides access to the service menu.

Service

What follows are pictorial descriptions of typical frontplate pushbutton sequences for each parameter setting function. By following the simple YES/NO prompts and arrow keys, users can navigate through the process of setting range, hold and service functions.

IM 12D7B3-E-E

5-2-2. Range

MODE

YES NO MODE

ENT

MEASURE

CAL

DISPLAY

HOLD

OUTPUT

SET HOLD

TEMP.

SERVICE

YES NO

NO

YES NO

NO

NO

YES NO

YES NO

NO

YES mA mA

YES NO

NO

ENT

ENT


IM 12D7B3-E-E


mA

5-2-3. HOLD

MODE

MEASURE

CAL

DISPLAY

HOLD

OUTPUT

SET HOLD

TEMP.

SERVICE

HOLD

NO

ENT

YES NO

NO

HOLD

ENT

YES NO

NO

YES

YES N O

NO

YES NO

NO

NO

YES N O

YES N O

YES

HOLD

YES N O

HOLD active last measured value.

NO

HOLD

YES

HOLD

ENT

Set HOLD "fixed value"

YES N O

YES

YES

NO

YES

IM 12D7B3-E-E


5-2-4. Temperature compensation

1. Why temperature compensation?

The conductivity of a solution is very dependent on temperature. Typically for every 1 °C change in temperature the solution conductivity will change by approximately 2 %. The effect of temperature varies from one solution to another and is determined by several factors like solution composition, concentration and temperature range. A coefficient () is introduced to express the amount of temperature influence in

% change in conductivity/°C. In almost all applications this temperature influence must be compensated before the conductivity reading can be interpreted as an accurate measure of concentration or purity.

Table 5-1. NaCl-compensation according to IEC 746-3 with T ref

= 25 °C

T Kt



T Kt



T Kt



30

40

50

0

10

20

25

0.54

0.72

0.90

1.0

1.10

1.31

1.53

1.8

1.9

2.0

---

2.0

2.0

2.1

200

60

70

80

90

100

110

120

4.78

1.76

1.99

2.22

2.45

2.68

2.90

3.12

2.2

2.2

2.2

2.2

2.2

2.2

2.2

2.2

130

140

150

160

170

180

190

3.34

3.56

3.79

4.03

4.23

4.42

4.61

2.2

2.2

2.2

2.2

2.2

2.2

2.2

2. Standard temperature compensation

From the factory the EXA is calibrated with a general temperature compensation function based on a sodium chloride salt solution. This is suitable for many applications and is compatible with the compensation functions of typical laboratory or portable instruments.

A temperature compensation factor is derived from the following equation:

K t

- K ref ref

100

K ref

In which:

T

K

 = Temperature compensation factor

(in %/ °C)

T = Measured temperature (°C)

K t

= Conductivity at T ref

= Reference temperature (°C) ref

= Conductivity at T ref

3. Manual temperature compensation

If the standard compensation function is found to be inaccurate for the sample to be measured, the transmitter can be set manually for a linear factor on site to match the application.

The procedure is as follows:

1. Take a representative sample of the process liquid to be measured.

2. Heat or cool this sample to the reference temperature of the transmitter (usually 25 °C).

3. Measure the conductivity of the sample with the EXA and note the value.

4. Bring the sample to the typical process temperature (to be measured with the EXA).

5. Adjust the display indication to the noted value at the reference temperature.

6. Check that the temperature compensation factor has been changed.

7. Insert the conductivity cell into the process again.

4. Other possibilities (section 5-4)

1. Enter calculated coefficient.

2. Enter matrix temperature compensation.

IM 12D7B3-E-E

mA mA


5-2-5. Temperature compensation selection

MODE

MEASURE

CAL

DISPLAY

HOLD

OUTPUT

SET HOLD

TEMP.

SERVICE

YES N O

NO

YES N O

NO

YES

YES N O

NO

YES

YES N O

NO

YES N O

NO

YES N O

NO

After briefly displaying

*WAIT* it will be possible to adjust the display reading to the correct value using > ENT keys.

YES

µ S / c m

ENT

ENT

Briefly

*WAIT*

YES

TEMP.1

or

TEMP.2

YES N O

NO

YES N O

IM 12D7B3-E-E


5-2-6. Service code

The figure below shows a typical button sequence to change a setting within the service menu. The specific settings are listed in numerical sequence on the following pages. On the page facing the setting tables are concise explanations of the purpose of the service codes.

MODE

MEASURE

CAL

DISPLAY

HOLD

OUTPUT

SET HOLD

TEMP.

SERVICE

After changing the parameter, the instrument first goes into reset to load the parameter specific default values.

mA mA

YES N O

NO

YES N O

NO

YES N O

NO

YES N O

NO

YES N O

YES

Example: Service Code 01

Select main parameter

for SC

for RES

With the >, ,ENT keys

ENT

ENT

ENT

ENT

ENT

ENT

ENT

NO

IM 12D7B3-E-E


5-3. Service Codes

5-3-1. Parameter specific functions

Code 1

Code 2

SC/RES Choose the required parameter, either conductivity or resistivity. If the parameter is changed the instrument will go into reset to load parameter specific default values, followed by starting measurement. For all other service codes the instrument will return to commissioning mode after the service code setting is finished.

4.ELEC Choose the required sensor type. Normally conductivity and/or resistivity measurements are done with 2-electrode type sensors. At high conductivity ranges, polarization of the electrodes may cause an error in conductivity measurement. For this reason 4-electrode type sensors may be necessary.

Code 3 0.10xC

Code 4 AIR

Enter the factory calibrated cellconstant mentioned on the textplate or on the fixed cable. This avoids the need for calibration. Any value between 0.008 and

50.0 /cm may be entered. The position of the decimal point may be changed according the visual description in the right-handed page of section 5-2-2.

*NOTE: If the actual cell constant is changed after a calibration or if the entered cell constant differs from previous value, then the message “RESET?” will appear on the second line display. After pressing “YES” the entered value becomes the new nominal and calibrated cell constant. After pressing “NO” the update procedure of the cell constant entry is canceled.

To avoid cable influences on the measurement, a “zero” calibration with a dry sensor may be done. If a connection box (BA10) and extension cable (WF10) are be used, “zero” calibration should be done including this connection equipment.

When using a 4-electrode sensor additional connections are required temporarily

Interconnect terminals 13 & 14 with each other and 15 & 16 with each other before making the adjustment. This is necessary to eliminate the capacitive influence of the cables. The links should be removed after this step is completed.

Code 5 POL.CK The EXA SC202 has a polarization check capable of monitoring the signal from the cell for distortion from polarization errors. If there is a problem with the installation or the cell becomes fouled, this will trigger E1. For some application with very low conductivity and long cable runs, this error detection can cause false alarms during operation. Therefore this code offers the possibility to disable/ enable this check.

IM 12D7B3-E-E


04

Code Display Function

Parameter specific functions

01

02

03

*SC.RES

*4-ELEC

*0.10xC

Function detail

Select main parameter Conductivity

Resistivity

Select 2/4-EL system 2-Electrode measurement system

4-Electrode measurement system

Set cell constant Press NO to step through choice of multiplying factors on the second display.

X

0

1

0

1

0.10xC

1.00xC

10.0xC

100.xC

*AIR

*START

*”WAIT”

*END

05

06-09

*POL.CK

Zero calibration

Polarization check

0.01xC

Press YES to select a factor

Use >, ^, ENT keys to adjust MAIN digits

Zero calibration with dry cell connected

Press YES to confirm selection

Press YES to start, after briefly displaying

“WAIT”, *END will be displayed

Press YES to return to commissioning mode

Polarization check off

Polarization check on

Not used

0

1

Z Y Default values

0 Cond.

0 2-El.

0.100 cm -1

0.10xC

1.000

1 On

IM 12D7B3-E-E


5-3-2. Temperature measuring functions

Code 10 T.SENS Selection of the temperature compensation sensor. The default selection is the Pt1000 Ohm sensor, which gives excellent precision with the two wire connections used. The other options give the flexibility to use a very wide range of other conductivity/resistivity sensors.

Code 11 T.UNIT

Code 12 T.ADJ

Celsius or Fahrenheit temperature scales can be selected to suit user preference.

With the process temperature sensor at a stable known temperature, the temperature reading is adjusted in the main display to correspond. The calibration is a zero adjustment to allow for the cable resistance, which will obviously vary with length. The normal method is to immerse the sensor in a vessel with water in it, measure the temperature with an accurate thermometer, and adjust the reading for agreement.

IM 12D7B3-E-E

11


Temperature measuring functions

10 *T.SENS Temperature sensor

Function detail

Pt1000

Ni100

*T.UNIT Display in °C or °F

Pb36

Pt100

8k55

°C

12

13-19

*T.ADJ

°F

Calibrate temperature Adjust reading to allow for cable resistance.

Use >, ^ , ENT keys to adjust value

Not used


X

1

4

0

2

3

0

1

Y Z Default values

0 Pt1000

0 °C

None

IM 12D7B3-E-E


5-4. Temperature compensation functions

Code 20 T.R.°C Choose a temperature to which the measured conductivity (or resistivity) value must be compensated. Normally 25°C is used, therefore this temperature is chosen as default value. Limitations for this setting are: 0 to 100 °C.

If T.UNIT in code 11 is set to °F, default value is 77°F and the limitations are

32 - 212°F.

Code 21 T.C.1/T.C.2 In addition to the procedure described in section 5-2-4 it is possible to adjust the compensation factor directly. If the compensation factor of the sample liquid is known from laboratory experiments or has been previously determined, it can be introduced here.

Adjust the value between 0.00 to 3.50 % per °C. In combination with reference temperature setting in code 20 a linear compensation function is obtained, suitable for all kinds of chemical solutions.

Code 22 MATRX The EXA is equipped with a matrix type algorithm for accurate temperature compensation in various applications. Select the range as close as possible to the actual temperature/concentration range. The EXA will compensate by interpolation and extrapolation. Consequently, there is no need for a 100% coverage.

If 9 is selected the temperature compensation range for the adjustable matrix must be configured in code 23. Next the specific conductivity values at the different temperatures must be entered in codes 24 to 28.

Code 23 T1, T2, T3, Set the matrix compensation range. It is not necessary to enter equal

T4 & T5 °C temperature steps, but the values should increase from T1 to T5, otherwise the entrance will be refused. Example: 0, 10, 30, 60 and 100 °C are valid values for the T1....T5. The minimum span for the range (T5 - T1) is 25 °C.

Code 24-28 L1xT1 - In these access codes the specific conductivity values can be entered for

L5xT5 5 different concentrations of the process liquid; each one in one specific access code (24 to 28). The table below shows a matrix entering example for 1 - 15%

NaOH solution for a temperature range from 0 - 100 °C.

NOTES:

1. In chapter 11 a table is included to record your programmed values. It will make programming easy for duplicate systems or in case of data loss.

2. Each matrix column has to increase in conductivity value.

3. Error code E4 occurs when two standard solutions have identical conductivity values at the same temperature within the temperature range.

Table 5-2. Example of user adjustable matrix

Matrix

Code 23 Temperature

Code 24 Solution 1 (1%)

Code 25 Solution 2 (3%)

T1...T5

L1

L2

Code 26 Solution 3 (6%) L3



Example

0 °C

31 mS/cm

86 mS/cm

Example

25 °C

Example

50 °C

Example

75 °C

Example

100 °C

53 mS/cm 76 mS/cm 98 mS/cm 119 mS/cm

145 mS/cm 207 mS/cm 264 mS/cm 318 mS/cm

146 mS/cm 256 mS/cm 368 mS/cm 473 mS/cm 575 mS/cm



IM 12D7B3-E-E


25

26

27

28

29

24

23

22


Temperature compensation functions

20

21

*T.R.°C

*T.C.1

Set reference temp.

Set temp. coef. 1

Function detail

Use >, ^, ENT keys to set value

Adjust compensation factor

*T.C.2 Set temp. coef. 2 if set to TC in section 5-2-5.

Set value with >, ^, ENT keys

Adjust compensation factor if set to TC in section 5-2-5.

*MATRX Select matrix

Set value with >, ^, ENT keys

Choose matrix if set to matrix comp.

in section 5-2-5, using >, ^, ENT keys

HCl (cation) pure water (0-80 °C)

Ammonia pure water (0-80 °C)

Morpholine pure water (0-80 °C)

HCl (0-5 %, 0-60 °C)

NaOH (0-5 %, 0-100 °C)

*T1 °C (°F) Set temp. range

*T2..

*T3..

*T4..

*T5..

*L1xT1

*L1xT2

....

*L1xT5

*L2xT1

*L3xT1

*L4xT1

*L5xT1

Enter conductivity values for lowest concentration

Concentration 2

Concentration 3

Concentration 4

Concentration 5

User programmable matrix

Enter 1st (lowest) matrix temp. value

Enter 2nd matrix temp. value

Enter 3rd matrix temp. value

Enter 4th matrix temp. value

Enter 5th (highest) matrix temp. value

Value for T1

Value for T2

Value for T5

Similar to code 24

Similar to code 24

Similar to code 24

Similar to code 24

Not used

X Y Z Default values

25 °C

2.1 % per °C

2.1 % per °C

1

2

3

4

5

9

1 HCI

IM 12D7B3-E-E


mA

5-5. mA output functions

Code 31 OUTP.F For the SC202 the output may be chosen as linear to input, or configured in a

21 point table to a particular linearization. Enable the table setup in code 31, and configure the table in code 35.

Code 32 BURN Diagnostic error messages can signal a problem by sending the output signals upscale or downscale (21 mA or 3.6 mA). This is called upscale or downscale burnout, from the analogy with thermocouple failure signaling of a burned-out or open circuit sensor. The pulse burnout setting gives a 21 mA signal for the first

30 seconds of an alarm condition. After the “pulse” the signal returns to normal.

This allows a latching alarm unit to record the error. In the case of the EXA the diagnostics are extensive and cover the whole range of possible sensor faults.

* Only when the HART communication is disabled the downscale output signal is 3.6 mA. When HART communication is enabled the output signal is 3.9 mA.

Code 35 TABLE The table function allows the configuration of an output curve by 21 steps

(intervals of 5%). The following example shows how the table may be configured to linearize the output with a mA curve.

CONDUCTIVITY (S/cm)

1,000

800

600

400

200

0

0 20 40 60

Output in %

80

CONCENTRATION (%)

25

20

15

10

5

0

0 20 40 60

Output in %

Fig. 5-1. Linearization of output

Example: 0-25% Sulfuric acid

80

100

100

Code 4-20 % H

Output mA Service Service mS/cm

2

SO

4 mS/cm Default code 55 code 35

0 4.0 0.00 0 0

45

50

55

60

65

70

75

80

5

10

15

20

25

30

35

40

85

90

17.6

18.4

95 19.2

100 20.0

4.8

5.6

6.4

7.2

8.0

8.8

9.6

10.4

11.2

12.0

12.8

13.6

14.4

15.2

16.0

16.8

11.25

12.50

13.75

15.00

16.25

17.50

18.75

20.00

1.25

2.50

3.75

5.00

6.25

7.50

8.75

10.00

21.25

22.50

23.75

25.00

466

515

555

590

625

655

685

718

60

113

180

218

290

335

383

424

735

755

775

791

Table 5-3.

Concentration Output function is done in de following order:

• Set OUTP.F. (Service Code 31) to table

• Set the Concentration range in % (Service Code 55)

• Set table values (%output and Conductivity values) in TABLE (Service Code 35)

450

500

550

600

650

700

750

800

50

100

150

200

250

300

350

400

850

900

950

1000

IM 12D7B3-E-E


mA Code Display mA Outputs

30

31

32

33, 34

*OUTP.F

*BURN

35 *TABLE

*0%

*5%

*10%

36-39

...

...

*95%

*100%

Function Function detail X

Not used mA output functions Linear

Burn function

Table

No burnout

Burnout downscale

Burnout upscale

Pulse burnout

Not used

Output table for mA

Linearization table for mA in 5% steps.

The measured value is set in the main display using the >, ^, ENT keys, for each of the 5% interval steps.

Where a value is not known, that value may be skipped, and a linear interpolation will take place.

Not used

2

3

0

1

0

1

Y Z Default values

0 Linear

0 No Burn.

IM 12D7B3-E-E

5-16 Service coded settings

5-6. User interface

Code 50

Code 52

*RET.

*PASS

When Auto return is enabled, the transmitter reverts to the measuring mode from anywhere in the configuration menus, when no button is pressed during the set time interval of 10 minutes.

Passcodes can be set on any or all of the access levels, to restrict access to the instrument configuration.

Error message configuration. Two different types of failure mode can be set.

Code 53 *Err01

Code 57 *USP

Hard fail gives a steady FAIL flag in the display. A fail signal is transmitted on the mA output when enabled in code 32.

Soft fail gives a flashing FAIL flag in the display. A good example is the dry sensor for a soft fail.

Code 54 *E5.LIM Limits can be set for shorted and open measurement. Dependent on the main

& *E6.LIM parameter chosen in code 01, the EXA will ask for a resistivity or conductivity value to be set (value to be set is the uncompensated conductivity/resistivity value).

* To disable the E5/E6 diagnostics the limit must be set to 0 (zero).

Code 55 *% For some applications the measured parameter values may be (more or less) linear to concentration. For such applications it is not needed to enter an output table, but 0 and 100% concentration values directly can be set.

Code 56 *DISP The display resolution is default set to autoranging for conductivity reading. If a fixed display reading is needed, a choice can be made out of 7 possibilities. For resistivity the default reading is fixed to xx.xx MΩ.cm.

Automatic checking for compliance with the water purity standard set in USP

(United States Pharmacopeia). For more detailed description see chapter 9.

IM 12D7B3-E-E


53

51

52

Code Display

User interface

50 *RET

*PASS

*Err.01

*Err.05

*Err.06

*Err.07

*Err.08

*Err.13.

56

55

54

57

58-59

*USP

*DISP

*E5.LIM

*E6.LIM

*%

*0%

*100%

Function Function detail

Auto return

Passcode

Auto return to measuring mode Off

Auto return to measuring mode On

Not used

Maintenance passcode Off

Note # = 0 - 9, where Maintenance passcode On

Commissioning passcode Off

1=111, 2=333, 3=777 Commissioning passcode On

4=888, 5=123, 6=957 Service passcode Off

7=331, 8=546, 9=847 Service passcode On

Error setting Polarization too high

Shorted measurement

Open measurement

Soft/Hard

Soft/Hard

Soft/Hard

Temperature sensor open Soft/Hard

Temp. sensor shorted

USP limit exceeded

Soft/Hard

Soft/Hard

E5 limit setting

E6 limit setting

Maximum conductivity value

(Minimum resistivity value)

Minimum conductivity value

(Maximum resistivity value)

Display mA in w/w% mA-range displayed in w/w% off mA-range displayed in w/w% on

Set 0% output value in w/w%

Set 100% output value in w/w%

Display resolution

USP setting

Auto ranging display

Display fixed to X.XXX µS/cm or MΩ.cm

Display fixed to XX.XX µS/cm or MΩ.cm

Display fixed to XXX.X µS/cm or MΩ.cm

Display fixed to X.XXX mS/cm or kΩ.cm

Display fixed to XX.XX mS/cm or kΩ.cm

Display fixed to XXX.X mS/cm or kΩ.cm

Display fixed to XXXX mS/cm or kΩ.cm

Disable the E13 (USP limit exceeded)

Enable the E13 (USP limit exceeded)

Not used

6

7

4

5

0

1

2

3

0

1

0

1

X

0

1

Y

0

#

0/1

0/1

0

#

0/1

0/1

0/1

0/1

Z

0

#

Default values

1 On

0.0.0 Off

Off

Off

1

1

1

1

1

0

250 mS

0.004 kΩ

1.000 µS

1.000 MΩ

Off

Hard

Hard

Hard

Hard

Hard

Soft

0

(2)

Auto

0 Off

IM 12D7B3-E-E


5-7. Communication setup mA

Code 60 *COMM. The settings should be adjusted to suit the communicating device connected to the output. The communication can be set to HART or to PH201*B distributor (for

*ADDR.

Japanese market only).

Select address 00 for point to point communication with 4-20mA transmission.

Addresses 01 to 15 are used in multi-drop configuration (fixed 4mA output).

mA

Code 61 *HOUR

*MINUT

*SECND

*YEAR

*MONTH

*DAY

The clock/calendar for the logbook is set for current date and time as reference.

Code 62 *ERASE Erase logbook function to clear the recorded data for a fresh start. This may be desirable when re-commissioning an instrument that has been out of service for a while.

5-8. General

Code 70 *LOAD The load defaults code allows the instrument to be returned to the default set up with a single operation. This can be useful when wanting to change from one application to another.

5-9. Test and setup mode

Code 80 *TEST The test mode is used to confirm the instrument setup. It is based on the factory setup procedure and can be used to check the QIC (factory generated

Certificate). This test is described in the Quality Inspection Standard, see chapter 12.

NOTE : Attempting to change data in service code, 80 and above without the proper instructions and equipment, can result in corruption of the instrument setup, and will impair the performance of the unit.

IM 12D7B3-E-H


mA mA

Code Display

Communication

61

60 *COMM.

*ADDR.

*HOUR

*MINUT

*SECND

*YEAR

*MONTH

*DAY

62

63-69

*ERASE

Function

Communication

Network address

Clock setup

Erase logbook

Function detail

Set communication

Set communication

Set communication PH201*B On

Communication write enable

Off

On

Communication write protect

Set address 00 to 15

Adjust to current date and time using

>, ^ and ENT keys

Press YES to clear logbook data

Not used

X

2

0

1

Y Z

0

1

Default values

1.0 On

00

Write enable

Code Display

General

70

71-79

*LOAD

Function

Load defaults

Function detail

Reset configuration to default values

Not used


Code Display

Test and setup mode

Function

80 *TEST Test and setup

Function detail

Built in test functions as detailed in QIS and Service Manual


IM 12D7B3-E-E

6-1 Calibration

6. CALIBRATION

6-1 When is calibration necessary?

Calibration of conductivity/resistivity instruments is normally not required, since Yokogawa delivers a wide range of sensors, which are factory calibrated traceable to NIST standards. The cell constant values are normally indicated on the top of the sensor or on the integral cable. These values can be entered directly in service code 03 (section 5-3-1). If the cell has been subjected to abrasion (erosion or coating) calibration may be necessary. In the next section two examples are given. Alternatively calibration may be carried out with a simulator to check the electronics only.

NOTE:

During calibration the temperature compensation is still active. This means that the readings are referred to the reference temperature as chosen in service code 20 (section 5-3-4, default 25 °C).

Calibration is normally carried out by measuring a solution with a known conductivity value at a known temperature. The measured value is adjusted in the calibration mode. On the next pages the handling sequence for this action is visualized. Calibration solutions can be made up in a laboratory. An amount of salt is dissolved in water to give a precise concentration with the temperature stabilized to the adjusted reference temperature of the instrument (default 25 °C). The conductivity of the solution is taken from literature tables or the table on this page.

Alternatively the instrument may be calibrated in an unspecified solution against a standard instrument.

Care should be taken to make a measurement at the reference temperature since differences in the type of temperature compensation of the instrument may cause an error.

NOTE:

The standard instrument used as a reference must be accurate and based on an identical temperature compensation algorithm. Therefore the Model SC82 Personal Conductivity Meter of Yokogawa is recommended.

Typical calibration solutions.

The table shows some typical conductivity values for sodium-chloride (NaCl) solutions which can be made up in a laboratory.

Table 6-1. NaCl values at 25 °C

Weight % mg/kg Conductivity

0.001

0.003

0.005

0.01

0.03

0.05

0.1

0.3

0.5

1

3

5

10

10

30

50

100

300

500

1000

3000

5000

10000

30000

50000

100000

21.4 µS/cm

64.0 µS/cm

106 µS/cm

210 µS/cm

617 µS/cm

1.03 mS/cm

1.99 mS/cm

5.69 mS/cm

9.48 mS/cm

17.6 mS/cm

48.6 mS/cm

81.0 mS/cm

140 mS/cm

NOTE:

For resistivity measurement the standard resistivity units of the calibration solution can be calculated as follows:

R = 1000/G (kΩ.cm if G = µS/cm)

Example:

0.001% weight

R = 1000/21.4 = 46.7 kΩ.cm

IM 12D7B3-E-E

6-2. Calibration procedure

MODE

YES NO MODE

ENT

MEASURE

CAL

DISPLAY

HOLD

MODE

YES N O

YES

YES NO

Put the sensor in standard solution. Press YES.

Set the value using the >, , ENT key.

Select the flashing digit with the > key.

Increase its value by pressing the key

When the correct value is displayed, press ENT to enter the change.

After briefing displaying WAIT, the CAL.END message appears.

The calibration is now complete. Put the

sensor back in the process and press YES.

ENT

ENT

Press the MODE key.

The legend CALIB appears, and the YES/NO key prompt flags flash.

Calibration 6-2

YES NO

ENT

The cell constant is automatically updated after the calibration and the new value can be read on the display as described in section 4.5.

The calculation is as follows: Cell constant in /cm= (Conductivity of calibration solution in mS/cm) x

(Cell resistance in kOhm)

Comparing this calibrated cell constant with the initial nominal cell constant in service code 03 gives a good indication of the stability of the sensor. If the calibrated cell constant differs more than 20% from the nominal cell constant error E3 is displayed.

IM 12D7B3-E-E

6-3 Calibration

6-3. Calibration with HOLD active

MODE

YES NO MODE

ENT

MEASURE

CAL

DISPLAY

HOLD

MODE

HOLD

YES N O

YES

HOLD

HOLD

YES NO

Put the sensor in standard solution. Press YES.

Set the value using the >, , ENT key.

Select the flashing digit with the > key.

Increase its value by pressing the key

When the correct value is displayed, press ENT to enter the change.

After briefing displaying WAIT, the CAL.END message appears.

The calibration is now complete. Put the

sensor back in the process and press YES.

HOLD will be displayed. Press NO to turn off

HOLD and return to the measuring mode.

ENT

HOLD

Press the MODE key.

The legend CALIB appears, and the YES/NO key prompt flags flash.

ENT

HOLD

HOLD

ENT

YES NO

HOLD

YES NO

IM 12D7B3-E-E

Maintenance 7-1

7. MAINTENANCE

7-1. Periodic maintenance for the EXA 202 transmitter

The EXA transmitter requires very little periodic maintenance. The housing is sealed to IP65 (NEMA 4X) standards, and remains closed in normal operation. Users are required only to make sure the front window is kept clean in order to permit a clear view of the display and allow proper operation of the pushbuttons.

If the window becomes soiled, clean it using a soft damp cloth or soft tissue. To deal with more stubborn stains, a neutral detergent may be used.

NOTE:

Never used harsh chemicals or solvents. In the event that the window becomes heavily stained or scratched, refer to the parts list (Chapter 10) for replacement part numbers.

When you must open the front cover and/or glands, make sure that the seals are clean and correctly fitted when the unit is reassembled in order to maintain the housing’s weatherproof integrity against water and water vapour. The measurement otherwise may be prone to problems caused by exposure of the circuitry to condensation (see page 10-1).

The EXA instrument contains a lithium cell to support the clock function when the power is switched off.

This cell needs to be replaced at 5 yearly intervals (or when discharged). Contact your nearest Yokogawa service centre for spare parts and instructions.

7-2. Periodic maintenance of the sensor

NOTE:

Maintenance advice listed here is intentionally general in nature. Sensor maintenance is highly application specific.

In general conductivity/resistivity measurements do not need much periodic maintenance. If the EXA indicates an error in the measurement or in the calibration, some action may be needed (ref. chapter 8 troubleshooting). In case the sensor has become fouled an insulating layer may be formed on the surface of the electrodes and consequently, an apparent increase in cell constant may occur, giving a measuring error. This error is:

Rv

Rcel

x 100 %

where:

Rv = the resistance of the fouling layer

Rcel = the cell resistance

NOTE:

Resistance due to fouling or to polarization does not effect the accuracy and operation of a 4-electrode conductivity measuring system. If an apparent increase in cell constant occurs cleaning the cell will restore accurate measurement.

Cleaning methods

1. For normal applications hot water with domestic washing-up liquid added will be effective.

2. For lime, hydroxides, etc., a 5 ...10% solution of hydrochloric acid is recommended.

3. Organic foulings (oils, fats, etc.) can be easily removed with acetone.

4. For algae, bacteria or moulds, use a solution of domestic bleach (hypochlorite).

* Never use hydrochloric acid and bleaching liquid simultaneously. The very poisonous chlorine gas will result.

IM 12D7B3-E-E

8-1 Troubleshooting

8. TROUBLESHOOTING

The EXA SC202 is a microprocessor-based analyzer that performs continuous self-diagnostics to verify that it is working correctly. Error messages resulting from faults in the microprocessor systems itself are few.

Incorrect programming by the user can be corrected according to the limits set in the following text.

In addition, the EXA SC202 also checks the sensor to establish whether it is still functioning within specified limits.

What follows is a brief outline of some of the EXA SC202 troubleshooting procedures, followed by a detailed table of error codes with possible causes and remedies.

8-1. Diagnostics

8-1-1. Off-line checks

The EXA SC202 transmitter incorporates a diagnostic check of the adjusted cell constant value at calibration. If the adjusted value stays within 80 - 120 % of the nominal value set in service code 03, it is accepted. Otherwise, the unit generates an error (E3). With a HART communication package it is possible to scroll the calibration data in a logbook function.

The EXA also checks the temperature compensation factor while performing manual temperature compensation as described in section 5.2.5. If the TC factor stays within 0.00% to 3.50% per °C, it is accepted. Otherwise, E2 will be displayed.

8-1-2. On-line checks

The EXA performs several on-line checks to optimize the measurement and to indicate a fault due to the fouling or polarization of the connected sensor. The fault will be indicated by the activation of the FAIL flag in the display.

During measurement the EXA adjusts the measuring frequency to give the best conditions for the actual value being measured. At low conductivity there is a risk of error due to the capacitive effects of the cable and the cell. These are reduced by using a low measuring frequency. At high conductivity the capacitive effects become negligible and errors are more likely to be caused by polarization or fouling of the cell. These errors are decreased by increasing the measuring frequency.

At all values the EXA checks the signal from the cell to search for distortion which is typical of capacitive or polarization errors. If the difference between pulse front and pulse rear is > 20% an error E1 will be displayed and the FAIL flag in the display is activated. In service code 05 it is possible to turn this check on and off.

IM 12D7B3-E-E

Troubleshooting 8-2

The following error message table gives a list of possible problems that can be indicated by the EXA.

mA mA

Table 8-1. Error Codes

Code Error description Possible cause Suggested remedy

E1 Polarization detected on cell

E2 Temperature coefficient out of limits

(0-3.5%/ºC)

E3 Calibration out of limits

Sensor surface fouled

Conductivity too high

Incorrect field calibration of TC

Clean sensor and calibrate

Replace sensor

Re-adjust

Set calculated TC

Calibrated value differs more than Check for correct sensor

+/- 20 % of nominal value programmed Check for correct unit (µS/cm, in code 03. mS/cm, kΩ.cm or MΩ.cm)

Repeat calibration

E4 Matrix compensation error

E5 Conductivity too high or resistivity too low

(Limits set in service code 54)

E6 Conductivity too low or resistivity too high


E7 Temperature sensor open

Wrong data entered in 5x5 matrix

Incorrect wiring

Internal leakage of sensor

Defective cable

Re-program

Check wiring (3-5)

Replace sensor

Replace cable

Dry sensor

Incorrect wiring

Immerse sensor

Check wiring (3-5)

Defective cable Replace cable

Process temperature too high or too low Check process

Wrong sensor programmed

Incorrect wiring

Check model code sensor

Check connections and cable

E8

(Pt1000 : T > 250°C or 500°F)

(Pt100/Ni100 : T > 200°C or 400°F)

(8k55 : T < -10°C or 10°F)

(PB36 : T < -20°C or 0°F)

Temperature sensor shorted

(Pt1000/Pt100/Ni100 : T < -20°C or 0°F)

(8k55/PB36 : T > 120°C or 250°F)

E9 Air set impossible

E10 EEPROM write failure

E13 USP limit exceeded

E15 Cable resistance influence to temperature exceeds +/- 15°C


Wrong sensor programmed Check model code sensor

Incorrect wiring Check connections and cable

Too high zero due to cable capacitance Replace cable

Fault in electronics Try again, if unsuccessful contact

Yokogawa

Poor water quality

Cable resistance too high

Corroded contacts


E17 Output span too small

E18 Table values make no sense

Incorrect configuration by user

Wrong data programmed

E19 Programmed values outside acceptable limits Incorrect configuration by user

E20 All programmed data lost Fault in electronics

E21 Checksum error

Very severe interference

Software problem

Check ion exchangers

Check cable

Clean and reterminate

Reprogram

Reprogram

Reprogram

Reprogram

Contact Yokogawa

Contact Yokogawa

IM 12D7B3-E-E

9-1 USP

9. USP WATER PURITY MONITORING

9-1. What is USP ?

USP stands for United States Pharmacopeia and it is responsible for issuing guidelines for the pharmaceutical industry. Implementing these guidelines is highly recommended for companies wishing to market drugs in the US. This means that USP is important for pharmaceutical companies worldwide.

USP recently issued: - USP - recommendations for conductivity measurement. This new USP, aims at the replacement of 5 antiquated laboratory tests by simple conductivity analysis.

9-2. What is conductivity measurement according to USP?

Life would be easy, if the limits for the conductivity of injection water were set to be 1.3 µS/cm at a reference temperature of 25°C. However, the committee (PHRMA WQC) who made the USP recommendations, could not agree on a simple Sodium Chloride model for water quality determination.

Instead, they chose a Chloride-Ammonia conductivity-pH model in water atmospherically equilibrated (CO2) at 25 °C.

The objective of the WQC was to find an easy way to establish the water quality, so on-line analysis at process temperature was a necessary requirement. However, if it is not possible to choose one temperature response model to work to, then it is also not possible to choose one temperature compensation algorithm.

We as a manufacturer of analytical equipment do not want to go into the details of whether the limiting conductivity values for water quality are based on the Chloride model or the Ammonia model. Our job is to develop on-line analyzers that make it simple for our customers to meet the water quality that is specified as “stage 1: Conductivity Limit as a Function of Temperature.”

If the water exceeds the limits of stage 1, then it can still be acceptable, but requires the customer to proceed to Stage 2, and possibly Stage 3, to validate the water quality. It is our objective to assure that our customers do not exceed the limits in stage 1 to avoid them having to carry out the complicated laboratory checks in Stages 2 and 3.

9-3. USP in the SC202

1. In SC202 we have defined an Error Code: E13. This is independent of what range the customer is measuring or what temperature compensation method he is using for water quality monitoring. When the display shows E13, then the water quality exceeds the USP limits, and the FAIL flag on the display is activated to signal that the system needs urgent attention.

2. We have introduced uncompensated conductivity in the DISPLAY menu. In the LCD display the user can read the temperature and the raw conductivity to compare his water quality with the USP table.

3. We have kept all the EXA functionality: It is even possible to have the mA Output and Display readings in resistivity units. Most users will have very good water quality and in the resistivity mode they will have better resolution on the recorder or DCS. The readings are simply the reciprocal values of the conductivity values. In the example mentioned above the contact will close at an uncompensated resistivity of 1/1.76 µS/cm. = 0.568 MΩ.cm.

IM 12D7B3-E-E

USP 9-2

9-4. Setting up SC202 for USP

First enable USP in service code 57. Change the setting from 0 (default) to 1 (enabled).

This activates uncompensated conductivity in the display menu. The E13 feature is also enabled. For E13 the FAIL flag is triggered when the uncompensated conductivity exceeds the relevant value in the graph.

Fig. 9-1.

Conductivity limit as a function of Temperature

3,5

3

2,5

2

1,5

1

0,5

0

0 25 50 75 100

Temperature in ºC

IM 12D7B3-E-E

10-1 Spare parts

10. SPARE PARTS

2

3a

3b

4

5a

5b

6

7

8

9

10

11

Options

/U

/SCT

/H

Table 10-1. Itemized parts list

Item No. Description

1 Cover assembly including window, gasket and fixing screws

Window

Internal works assembly (general purpose)

Internal works assembly (intrinsically safe)

Digital (display) board

Analogue (input) board (general purpose)

Analogue (input) board (intrinsically safe)

Ribbon cable

EPROM

Lithium cell (battery)

Terminals (block of 3)

Housing

Gland set (one gland including seal and backing nut)

Pipe and wall mounting hardware

Stainless steel tag plate

Hood for sun protection

Part no.

K1542JZ

K1542JN

K1544DJ

K1544DK

K1544DB

K1544SK

K1544SE

K1544PH

K1544BJ

K1543AJ

K1544PF

K1542JL

K1500AU

K1542KW

K1544ST

K1542KG

2

N20

0

Su co int

MO

DE

L

IV IT Y

03 44

UC

TI

CO

ND

VI

TY /

RE SI

ST

R

TRA

NS

EX

IT TE

A SC

20

2S

RA

MM AB

LE

RANG

SU

PP

OU

TP

LY

UT

AM

B.

TE MP

. [

]

SE

II 2 (1

RI AL

No

EE x ib

EE x ib

[ia ] II

[ia ] IIC

) G

-1

Ta

Ta

WA mp rin

E

RNIN bs sic on en

sa

G n o fet

KE

IS CL

T4

T6

HA

FF

Ex ia

T4

T6

Re

fo

fo

SC2 ts ma

MA fer for

Z L

1-S

CL r T r T

02 y i mp

00 air

AT

I, DI

24

PROG

V

4 T

O

DC

20

C

m

A D

TO

-10

ºC

55

OC pe

C2 02

I, D a a -

to In

S C

10

C

T4

EX

T6

0 t

, G

0 t r Co

S-

IV

to

to sta lla

SA

AV

La pe int

su rin for for

10 69

00

1,

55

40 tio

ER co së o 4

Ta

Ta

P A o 5 ntr

Th

0 º

X

BC

C

-1 0 t

-1 0 t

D o 5 o 4 ng awi

GP AB

ºC

ºC

CD g

TIS bs titu mp e.

Am

C ol Dr

SEM tio ett rom ers foo eth e c re om la sè

5 º

0 º po rt, erl an ds

C

C sa ritè

12

7

4

5a(b)

8

9

3a (b)

6

11

10

1

Fig. 10-1. Exploded view

IM 12D7B3-E-E

Appendix 11-1

11. APPENDIX mA

11-1. User setting for non-linear output table (code 31and 35)

0 60

0 65

0 70

0 75

0 80

0 85

0 90

0 95

100

Output signal value

% mA

Output 4-20

00 0

00 5

0 10

0 15

00.

0

0

0

4

4.8

5.6

6.4

0 20

0 25

0 30

0 35

0 40

0 45

0 50

0 55

0 7.2

00.

8

0 8.8

0 9.6

10.4

11.2

0.

12

12.8

13.6

14.4

15.2

0.

16

16.8

17.6

18.4

19.2

20.0

11-2. User entered matrix data (code 23 to 28)

T1 data Medium:

Code 23 Temperature

Code 24 Solution 1

Code 25 Solution 2

Code 26 Solution 3

Code 27 Solution 4

Code 28 Solution 5

T1...T5

L1

L2

L3

L4

L5

T2 data T3 data T4 data T5 data

Medium:

Code 23 Temperature

Code 24 Solution 1

Code 25 Solution 2

Code 26 Solution 3

Code 27 Solution 4

Code 28 Solution 5

T1...T5

L1

L2

L3

L4

L5

T1 data T2 data T3 data T4 data T5 data

IM 12D7B3-E-E

11-2 Appendix

11-3. Matrix data table (user selectable in code 22)

Matrix, Solution

HCL-p (cation) selection 1

20

30

40

50

Temp (°C)

0

10

60

70

80

Data 1

0 ppb

0.0116 µS

0.0230 µS

0.0419 µS

0.0710 µS

0.1135 µS

0.173 µS

0.251 µS

0.350 µS

0.471 µS

Data 2

4 ppb

0.0228 µS

0.0352 µS

0.0550 µS

0.085 µS

0.129 µS

0.190 µS

0.271 µS

0.375 µS

0.502 µS

Data 3

10 ppb

0.0472 µS

0.0631 µS

0.0844 µS

0.115 µS

0.159 µS

0.220 µS

0.302 µS

0.406 µS

0.533 µS

Ammonia-p selection 2

Morpholine-p selection 3

Hydrochloric Acid selection 4 0

15

30

45

60

Sodium Hydroxide selection 5 0

25

50

75

100

30

40

50

60

0

10

20

70

80

30

40

50

60

0

10

20

70

80

1%

65 mS

91 mS

114 mS

135 mS

159 mS

1%

31 mS

53 mS

76 mS

97.5 mS

119 mS

0 ppb

0.0116 µS

0.0230 µS

0.0419 µS

0.0710 µS

0.113 µS

0.173 µS

0.251 µS

0.350 µS

0.471 µS

0 ppb

0.0116 µS

0.0230 µS

0.0419 µS

0.0710 µS

0.113 µS

0.173 µS

0.251 µS

0.350 µS

0.471 µS

2%

125 mS

173 mS

217 mS

260 mS

301 mS

2%

61 mS

101 mS

141 mS

182 mS

223 mS

2 ppb

0.0229 µS

0.0337 µS

0.0512 µS

0.0788 µS

0.120 µS

0.178 µS

0.256 µS

0.356 µS

0.479 µS

20 ppb

0.0272 µS

0.0402 µS

0.0584 µS

0.0851 µS

0.124 µS

0.181 µS

0.257 µS

0.357 µS

0.481 µS

3%

179 mS

248 mS

313 mS

370 mS

430 mS

3%

86 mS

145 mS

207 mS

264 mS

318 mS

5 ppb

0.0502 µS

0.0651 µS

0.0842 µS

0.111 µS

0.149 µS

0.203 µS

0.278 µS

0.377 µS

0.501 µS

50 ppb

0.0565 µS

0.0807 µS

0.108 µS

0.140 µS

0.181 µS

0.234 µS

0.306 µS

0.403 µS

0.528 µS

10 ppb

0.0966µS

0.122 µS

0.150 µS

0.181 µS

0.221 µS

0.273 µS

0.344 µS

0.439 µS

0.563 µS

100 ppb

0.0963µS

0.139 µS

0.185 µS

0.235 µS

0.289 µS

0.351 µS

0.427 µS

0.526 µS

0.654 µS

Data 4

20 ppb

0.0911µS

0.116 µS

0.145 µS

0.179 µS

0.225 µS

0.286 µS

0.366 µS

0.469 µS

0.595 µS

4%

229 mS

317 mS

401 mS

474 mS

549 mS

4%

105 mS

185 mS

268 mS

339 mS

410 mS

500 ppb

0.288 µS

0.431 µS

0.592 µS

0.763 µS

0.938 µS

1.12 µS

1.31 µS

1.52 µS

1.77 µS

50 ppb

0.423 µS

0.535 µS

0.648 µS

0.758 µS

0.866 µS

0.974 µS

1.090 µS

1.225 µS

1.393 µS

Data 5

100ppb

0.450 µS

0.565 µS

0.677 µS

0.787 µS

0.897 µS

1.008 µS

1.123 µS

1.244 µS

1.373 µS

5%

273 mS

379 mS

477 mS

565 mS

666 mS

5%

127 mS

223 mS

319 mS

408 mS

495 mS

IM 12D7B3-E-E

Appendix 11-3

11-4. Sensor Selection

11-4-1. General

The inputs of the EXA transmitter are freely programmable for ease of installation. Standard 2-electrode type sensors with a cell constant of 0.100/cm and a Pt1000 temperature sensor, need no special programming. The EXA indicates a fault with a signal in the display field if there is a mismatch of sensors in the connection.

11-4-2. Sensor selection

The EXA SC202 is pre/programmed to accept standard 2-electrode sensors with a Pt1000 temperature sensor. The EXA is universally compatible with all 2- and 4-electrode type of sensors with a cell constant within the range of 0.008/cm to 50.0/cm.

11-4-3. Selecting a temperature sensor

The EXA SC202 reaches its highest accuracy when used with a Pt1000 temperature sensor. This may influence the choice of the conductivity/resistivity sensor, as in most cases the temperature sensor is integrated in the conductivity/resistivity sensor.

11-5. Setup for other functions mA

●

Current Outputs

Transmission signals for the measured parameters can be set up in service codes 30-39.

●

Diagnostic checks

Polarization check and checks on the calibrated cell constant and the adjusted Temperature Coefficient, are included in the EXA SC202.

mA

●

Communications

The proprietary HART communication link allows remote configuration and data retrieval through the

PC202 communication package. This is an excellent tool for the maintenance engineer, quality engineer or plant manager. Service codes 60 - 69 are used to set up the communications.

●

Logbook

In combination with the communications link, a “logbook” is available to keep an electronic record of events such as error messages, calibrations and programmed data changes. By reference to this log, users can for instance easily determine maintenance or replacement schedules.

Note:

On the pages 11-4 & 11-5 a reference list for the configuration of the SC202 is shown.

IM 12D7B3-E-E

11-4 Appendix

11-6. User setting table mA

FUNCTION SETTING DEFAULTS

Parameter specific functions

01 *SC.RES

02 *4-Elec

0

0

SC

2-Elec.

03 *0.10xC

04 *AIR

05 *POL.C.K

0.10xC

1.000

1

Factor

/cm

On

Temperature measuring functions

10

11 *T.UNIT

12

*T.SENS

*T.ADJ

0

0

Pt1000

°C

None

Temperature compensation functions

20 *T.R.°C

21 *T.C.1

25

2.1

°C

%/°C

*T.C.2

22 *MATRX

23 *T1°C

24 *L1xT1

2.1

T. range

Cond. C1

%/°C

None, see 5-2-5

See sep. table, 11-2


25

26

27

28

*L2xT1

*L3xT1

*L4xT1

*L5xT1

mA outputs

31 *OUTP.F

32 *BURN

35 *TABL1

Cond. C2

Cond. C3

Cond. C4

Cond. C5

0

0

21 pt table





Linear S.C.

No Burn see code 31, 11-1

USER SETTINGS

IM 12D7B3-E-E

mA mA

FUNCTION SETTING DEFAULTS

User Interface

50 *RET

52 *PASS

1

0.0.0 on all off

53 *Err.01

*Err.05

*Err.06

*Err.07

1

1

1

1 hard fail hard fail hard fail hard fail

54

55

*Err.08

*Err.13

*E5.LIM

*E6.LIM

*0 %

100%

1

0

250

(0.004)

1.000

(1.0)

0

100.0

hard fail soft fail mS kΩ.

µS

MΩ.

Off

56 *DISP

57 *USP

Communication

60 *COMM.

*ADDR.

61 *HOUR

62 *ERASE

0

(2)

0

General

70 *LOAD

Test and setup mode

80 *TEST

0.1

00

Auto ranging (SC)

(xx.xxMΩ.cm) (RES) off off/write prot.

00

USER SETTINGS

Appendix 11-5

IM 12D7B3-E-E

11-6 Appendix

mA mA

11-7. Error codes

Code Error description

E1 Polarization detected on cell

E2 Temperature coefficient out of limits

(0-3.5%/ºC)

E3 Calibration out of limits

Possible cause

Sensor surface fouled

Conductivity too high

Incorrect field calibration of TC

Suggested remedy

Clean sensor

Replace sensor

Re-adjust

Calibrated value differs more than

Set calculated TC

Check for correct sensor

+/- 20 % of nominal value programmed Check for correct unit (µS/cm, in code 03. mS/cm, kΩ.cm or MΩ.cm)

Repeat calibration

E4 Matrix compensation error

E5 Conductivity too high or resistivity too low


E6 Conductivity too low or resistivity too high


E7 Temperature sensor open

Wrong data entered in 5x5 matrix

Incorrect wiring

Internal leakage of sensor

Defective cable

Re-program

Check wiring (3-6)

Replace sensor

Replace cable

Dry sensor

Incorrect wiring

Immerse sensor

Check wiring (3-6)

Defective cable Replace cable



Incorrect wiring

Check model code sensor

Check connections and cable

E8

(Pt1000 : T > 250°C or 500°F)

(Pt100/Ni100 : T > 200°C or 400°F)

(8k55 : T < -10°C or 10°F)

(PB36 : T < -20°C or 0°F)

Temperature sensor shorted

(Pt1000/Pt100/Ni100 : T < -20°C or 0°F)

(8k55/PB36 : T > 120°C or 250°F)

E9 Air set impossible

E10 EEPROM write failure

E13 USP limit exceeded

E15 Cable resistance influence to temperature exceeds +/- 15°C


Wrong sensor programmed Check model code sensor

Incorrect wiring Check connections and cable

Too high zero due to cable capacitance Replace cable

Fault in electronics Try again, if unsuccessful contact

Yokogawa

Poor water quality

Cable resistance too high

Corroded contacts


E17 Output span too small

E18 Table values make no sense

Incorrect configuration by user

Wrong data programmed

E19 Programmed values outside acceptable limits Incorrect configuration by user

E20 All programmed data lost Fault in electronics

E21 Checksum error

Very severe interference

Software problem

Check ion exchangers

Check cable

Clean and reterminate

Reprogram

Reprogram

Reprogram

Reprogram

Contact Yokogawa

Contact Yokogawa

IM 12D7B3-E-E

Appendix 11-7

mA

11-8. Device Description (DD) menu structure

The Device Description (DD) is available from Yokogawa or the HART foundation. An example is shown below of the ON LINE menu structure. This manual makes no attempt to explain the operation of the Hand

Held communicator (HHC). For detailed operating instructions, refer to the HHC user’s manual and the online help structure.

Level 1 menu

Process variab.

Level 3 menu

Level 4 menu Level 5 menu

Diag/Service

Level 2 menu

Process value

Second process value

Uncomp. process val.

Weight percentage

Temperature

% of output range

Status

Hold

Logbook

Error status

Hold on/off

Hold enable/disable

Hold type

Hold value

Logbook conf.

Logbook 1

Logbook 2

Event1...event64

Rec.1...50

Rec.1...50

Basic Setup

Tag

Device informat.

Date

Descriptor

Message

Write protect

Manufacture device id

Detailed Setup Param. Specific.

ON LINE MENU

Device setup

Primary value

Analog output

Lower rangeval.

Upper rangeval.

Review

Temp. Specific.

Temp. compens.

Output function

User Interface

Process unit

2 or 4 electrodes

Nominal CC

CC after calibration

Polarization check

Temp.sensor

Temp. unit

Reference temp

Temp. compens.1

TC1 percentage

Temp. Compens.2

TC2 percentage

Matrix selection

Matrix table mA function

Burn function mA-Table

Error programming

Display

Matrix temp. 1...5

Matrix1_1..5_5

Table 0%...100%

Error 1...Error 13

Auto return

E5 limit

E6 limit

Weight 0%

Weight 100%

Display format

USP

Passcode

Maintenance

Commissioning

Service

Model

Manufacturer

Distributor

Tag

Descriptor

Message

Date

Device id

Write protect

Universal revision

Transmitter revision

Software revision

Hardware revision

Polling address

Req. preambles

IM 12D7B3-E-E

11-8 Appendix

11-9. Field Change Order

11-9-1 Changes made by software release 1.1

• PH201 communication added for Japanese market


• E20 is cleared after the programmed data was recovered


• Communication is default set to enabled / write enabled


• Minimal celconstant changed from 0,008cm

-1

to 0,005cm

-1


• Default Temperature Compensation Matrix loaded, to prevent ‘impossible’ values after a loading all parameters from DCS


• Create possibility to disable E5/E6 diagnostics by setting the E5/E6 limits to 0 (zero)

• Burn down outputsignal changed to 3.9 mA when the HART communication is enabled.

When disabled it is 3.6 mA

• Fixed rare HART communication failure


• Implementation of Burn low in combination with HART changed.

• Some minor improvements in HART communication.

IM 12D7B3-E-E

12-1 Test Certificate

12.1 TEST CERTIFICATE

Test

Certificate

EXA Series

Model SC202

Inductive Conductivity Transmitter

1. Introduction

This inspection procedure applies to the model SC202 Conductivity transmitter. There is a serial number, unique to the instrument, which is stored in non-volatile memory. Each time the transmitter is powered up, the serial number is shown in the display. An example is shown below, for details see the

Users manual:

025

F70.00

Unique Number

Line Number

ATE (automatic test equipment no.)

Month code

Year code

2. General Inspection

Final testing begins with a visual inspection of the unit to ensure that all the relevant parts are present and correctly fitted.

3. Safety Test

The (-) minus and the external ground terminal of the housing are connected to a Voltage generator

(100 VDC). The measured impedance value should be over 9.5 MΩ.

Terminal 14 and the external ground terminal of the housing are connected to a Voltage generator (500

VAC RMS) for 1 minute. The leakage current should remain below 12 mA.

4.1 Accuracy Testing

Our automated testing facility checks the resistivity input accuracy of the instrument using a calibrated variable resistor (decade resistor box).

4.2 Accuracy Testing of all supported temperature elements

Our automated testing facility checks the input accuracy of the instrument using a calibrated variable resistor (decade resistor box) to simulate the resistance of all temperature elements.

IM 12D7B3-E-E


4.3 Overall Accuracy Test

This test can be performed by the end-user to check the overall accuracy of the instrument. The data specified on the Test certificate are results of the overall accuracy test performed during production and can be reproduced by performing similar tests with the following test equipment:

1. A variable resistor (resistor decade box 1) to simulate the temperate element.

All tests are performed simulating 25oC (77 oF).

2. A second variable resistor (box 2) to simulate the conductivity. Recommended is a resistor decade box in steps of 1 Ω, between 2 Ω and 1200 kΩ. (accuracy 0.1%)

3. A fixed resistor of 300� U to simulate the mA-output load.

4. Screened cable to connect the input signals (a WU20 cable with a length of 2 metres is preferred)

5. A stabilised voltage supply unit : nominal 24 Volt DC

6. A current meter for DC currents up to 25 mA, resolution 1µA, accuracy 0.1%

Connect the SC202 as shown in Figure 1. Set box 1 to simulate 25 oC (1097,3� U for Pt1000).

Before starting the actual test, the SC202 and peripheral testing equipment has to be connected to the power supply for at least 5 minutes, to assure the instrument is warmed up properly.

Figure 1. Connection diagram for the overall accuracy test

The tolerances specified relate to the performance of the SC202 with calibrated purpose built test equipment under controlled test conditions (humidity, ambient temperature). Note that these accuracy’s are only reproducible when performed with similar test equipment under similar test conditions. Under other conditions, the accuracy and linearity of the test equipment will be different. The display may show values, which differ as much as 1% from those measured under controlled conditions.

5. Accuracy test mA output circuit

Our automated testing facility checks the output accuracy of the instrument with simulated mA-output values.

IM 12D7B3-E-E


IM 12D7B3-E-E

YOKOGAWA HEADQUARTERS

9-32, Nakacho 2-chome,

Musashinoshi

Tokyo 180

Japan

Tel. (81)-422-52-5535

Fax (81)-422-55-1202 www.yokogawa.com

YOKOGAWA EUROPE B.V.

Databankweg 20

3821 AL AMERSFOORT

The Netherlands

Tel. +31-33-4641 611

Fax +31-33-4641 610 www.yokogawa.com/eu

IM 12D7B3-E-E

Subject to change without notice

Copyright©

YOKOGAWA CORPORATION OF AMERICA

2 Dart Road

Newnan GA 30265

United States

Tel. (1)-770-253-7000

Fax (1)-770-251-2088 www.yokogawa.com/us

YOKOGAWA ELECTRIC ASIA Pte. Ltd.

5 Bedok South Road

Singapore 469270

Singapore

Tel. (65)-241-9933

Fax (65)-241-2606 www.yokogawa.com.sg

Yokogawa has an extensive sales and distribution network.

Please refer to the European website

(www.yokogawa.com/eu) to contact your nearest representative.

YOKOGAWA

Printed in The Netherlands, 10-702(A) I

YOKOGAWA EXA SC202S User manual

User’s

Manual

Model SC202G (S)

Conductivity and Resistivity

Transmitter

YOKOGAWA

The terminations of the WU40.LH x x cable are as shown.

>Connections differential 4-electrode

*

Display Functions

(Sequence for resistivity function equals this conductivity example).

Test

Certificate

EXA Series

Model SC202

Inductive Conductivity Transmitter

YOKOGAWA

Key Features

Related manuals

Frequently Answers and Questions

What is the installation site requirement for SC202?

How do I wire the sensor?

How do I set the range?

Table of contents

YOKOGAWA EXA SC202S User manual

User’s

Manual

Model SC202G (S)

Conductivity and Resistivity

Transmitter

YOKOGAWA

The terminations of the WU40.LH x x cable are as shown.

>Connections differential 4-electrode

*

Display Functions

(Sequence for resistivity function equals this conductivity example).

Test

Certificate

EXA Series

Model SC202

Inductive Conductivity Transmitter

YOKOGAWA

Key Features

Related manuals

Status

PT100

ABB

AWT210

Azbil

ATT085

YOKOGAWA

SC200

YOKOGAWA

SC202G

Precision

Precision Power PP36PB-12-EX

Murphy

Mark IV Digital Fault Annunciator Tattletale

Shinko

WIL-102-SE

Frequently Answers and Questions

What is the installation site requirement for SC202?

How do I wire the sensor?

How do I set the range?

Table of contents