YOKOGAWA SC202G(S) User manual

User’s
Manual
Model SC202G(S)
Conductivity and Resistivity
Transmitter
IM 12D7B3-E-H
6th Edition
YOKOGAWA

IM 12D7B3-E-H
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-H
5-3. Service Codes ........................................................................................................................5-11
5-3-1. Parameter specific functions .....................................................................................5-12
5-3-2. Temperature compensation and measuring functions................................................5-14
5-4. Temperature compensation ....................................................................................................5-16
5-5. mA Output functions...............................................................................................................5-18
5-6. User interface .........................................................................................................................5-20
5-7. Communication setup.............................................................................................................5-22
5-8. General...................................................................................................................................5-22
5-9. Test and setup mode ..............................................................................................................5-22
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

PREFACE
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-H
WARNING

IM 12D7B3-E-H
CONFIGURATION CHECKLIST FOR SC202
Primary choices default alternatives reference on page menu
Measurement Conductivity Resistivity 5.8- 5.9 SC 01
Range 0-1000 µS/cm max. 1999 mS°C 5.3 "range"
Temperature unit Celsius Fahrenheit 5.10- 5.11 SC 11
Sensor
Cell constant 0.1 /cm any value between 0.08 and 50 5.8-5.9, 6.1- 6.3 SC 03
Sensor type 2-electrode 4- electrode 5.8- 5.9 SC 02
Temperature compensator Pt1000 Ni100, Pt100, 8k55, Pb36 5.10-5.11 SC 10
Choices
Communication enabled disable HART(R), PH201*B 5.19 SC 60- 62
Burn out inactive HI or LO output on fail 5.14- 5.15 SC 32
Temperature compensation NaCl in water fixed T.C., matrix 5.12, 5.13, 5.5 SC 20- 28; "temp"
USP functionality inactive Fail if USP limits are 9.1, 9.2, 5.17 SC 57
exceeded
HOLD during maintenance inactive HOLD last value or fixed value 5.17, 5.3- 5.4 "hold", SC 50
Calibration temperature inactive adjustment +/- 15 °C 5.11 SC 12
ZERO calibration inactive adjustment +/-1 µS/cm 5.9 SC 04
Diagnostics hard alarm on hard or soft choices 5.17 SC 53
all errors
Cell fouling alarm active except E13 inactive 5.9 SC 05
Password protection inactive password for different levels 5.17 SC 52
Output in Concentration units inactive linearization of output, w% 5.14 - 5.17 SC 31/35/55
on LCD

IM 12D7B3-E-H
Introduction 1-1
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 ship-
ment. If damage is found, retain the original packing materials (including the outer box) and then immedi-
ately 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 textplates are shown below.
Figure 1-1. Textplate
NOTE: The textplate 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.
Basic Parts List: Transmitter SC202
User’s Manual (See model code for language)
Optional mounting hardware when specified (See model code)
NOTE: mounting screws and special grommet are packed in the terminal compartment.
N200
CONDUCTIVITY / RESISTIVITY
TRANSMITTER
PROGRAMMABLE
24V DC
4 TO 20 mA DC
-10 TO 55 °C
SUPPLY
OUTPUT
AMB.TEMP. [ Ta ]
SERIAL No.
RANGE
MODEL EXA SC202G
N200
CONDUCTIVITY / RESISTIVITY
TRANSMITTER
24V DC
4 TO 20 mA DC
-10 TO 55 °C
SUPPLY
OUTPUT
AMB.TEMP. [ Ta ]
SERIAL No.
EEx ib [ia] IIC T4
EEx ib [ia] IIC T6
KEMA 00ATEX1069 X
IS CL I, DIV 1, GP ABCD
T4
T6
HAZ LOC per Control Drawing
FF1-SC202S-00
MODEL EXA SC202S
SC202S CSA
WARNING
Substitution of
components may impair
intrinsic safety
AVERTISSEMENT
La substitution de composants
peut compromettre la sécurité
intrinsèque.
T4 for Ta -10 to 55 °C
T6 for Ta -10 to 40 °C
Ex ia CL I, DIV 1, GP ABCD,
Refer to Installation Drawing
for Ta -10 to 55 °C
for Ta -10 to 40 °C
0344
Amersfoort, The Netherlands
II 2 (1) G
RANGE PROGRAMMABLE
for Ta -10 to 55 °C
for Ta -10 to 40 °C
N200
CONDUCTIVITY / RESISTIVITY
24V DC
4 TO 20 mA DC
-10 TO 55 °C
SUPPLY
OUTPUT
AMB.TEMP. [ Ta ]
SERIAL No.
EEx nA [L] IIC T4
EEx nA [L] IIC T6
KEMA 00ATEX1070 X
NI CL I, DIV 2, GP ABCD
T4
T6
HAZ LOC per Control Drawing
FF1-SC202S-00
MODEL EXA SC202S-N
SC202S CSA
WARNING
Substitution of
components may
impair suitability for
AVERTISSEMENT
La substitution de composants
peut rendre ce materièl inacceptable
pour les emplacements de
NI CL I, DIV 2, GP ABCD
Refer to Installation Drawing
for Ta -10 to 55 °C
for Ta -10 to 40 °C
0344
Amersfoort, The Netherlands
II 3 G
RANGE PROGRAMMABLE
for Ta -10 to 55 °C
for Ta -10 to 40 °C
TRANSMITTER
T4
T6 for Ta -10 to 55 °C
for Ta -10 to 40 °C
Class I, Division 2. Classe I, Division 2.
Y = Year M = Month
2000 M January 1
2001 N February 2
2002 P March 3
2003 R April 4
........ .. .......... ..
2008 W September 9
2009 X October O
2010 A November N
2011 B December D

IM 12D7B3-E-H
1-2 Introduction
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 sys-
tem.
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 mainte-
nance 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-H
Specifications 2-1
2. GENERAL SPECIFICATIONS
2-1. Specifications
A. Input specifications : Two or four electrodes measurement
with square wave excitation. Cell con-
stants 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.
C. Input ranges
- Conductivity : 0.000 µS/cm to 1999 mS/cm at
25 °C (77 °F) reference temperature.
Minimum : 0.2 µS x C at process temperature
(underrange 0.000 µS/cm).
Maximum : 500 mS x C at process temperature
(overrange 550 mS x C).
- Resistivity : 0.000 kΩ- 999 MΩ/C at 25 °C
(77 °F) reference temperature.
Minimum : 0.002 kΩ/C at process temperature
(underrange 0.000 kΩx cm).
Maximum : 5 MΩ/C at process temperature
(overrange 999 MΩx 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)
D. Output Span
- Conductivity : - min 0.01µS/cm
: - max. 1999 mS/cm. (max 90% zero
suppression)
- Resistivity : - min 0.001kΩxcm
: - max. 999 MΩx cm. (max 90% zero
suppression)
- Temperature : Dependent on temp. sensor type:
Sensor type min. max.
Pt1000 25 °C (50 °F) 250 °C (500 °F)
Pt100, Ni100 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.
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
(default).
-T.C. : Two independent user programmable
temperature coefficients, from -0.00%
to 3.50% per °C (°F) by adjustment or
calibration.
- Matrix : : Conductivity function of concen-
tration and temperature. Choice out of
5 preprogrammed matrixes and a
25-point user-programmable matrix.
H. Serial Communication
: Bi-directional according to HART
digital communication super imposed
on the 4-20mA signal.
I. Logbook : Software record of important events
and diagnostic data. Available through
HART interface.
J. Display : Custom liquid crystal display, with a
main display of 31/2digits 12.5 mm
high. Message display of 6 alpha-
numeric characters, 7 mm high.
Warning flags and units (mS/cm,
kΩ.cm, µS/cm and MΩ.cm) as
appropriate.
K. Power supply : Nominal 24 volt DC loop powered
system.
SC202G ; up to 40 volts
SC202S : up to 31.5 volts
Note: 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.
Fig. 2-1. Supply voltage/ load diagram
Fig. 2-2. Minimum terminal voltage at the SC202
0.0
200.0
400.0
600.0
800.0
1000.0
1200.0
12 14 16 18 20 22 24 26 28 30 32 34 36 38 40
4 mA 22 mA
425.0
775.0
31.5 V
(limit for IS version)
Voltage (V)
Load Resistance (Ω)
230.0
1100.0
Communication
Range
17 Volts
14.5 Volts
4 mA 7 mA 20 mA
Terminal voltage (V)
Output Current (mA)

IM 12D7B3-E-H
2-2 Specifications
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 : Conductivity
- Accuracy : ≤0.5 % ± 0.02 mA
Performance : Resistivity
- Accuracy : ≤0.5 % ± 0.02 mA
Performance : Temperature with Pt1000Ω, Ni100Ω
and Pb36 NTC
- Accuracy : ≤0.3 °C ± 0.02 mA
Performance : Temperature with PT100Ωand
8k55Ω
- Accuracy : ≤0.4 °C ± 0.02 mA
Performance : Temperature compensation
- NaCl table : ≤1 %
- Matrix : ≤3 %
- Ambient influence : ≤0.05 %/°C
- Step response : 90 % (< 2 decades) in ≤7 seconds
B. Ambient operating temperature
: -10 to +55 oC (-10 to 130 ºF)
Excursions to -30 to +70 oC
(-20 to 160 ºF) will not damage the
instrument, specification maybe
adversely affected
Drift < 500 ppm/°C
C. Storage temperature
: -30 to +70 oC (-20 to 160 ºF)
D. Humidity : 10 to 90% RH non-condensing
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 mm2finished wires.
Weather resistant to IP65 and NEMA
4X standards. Pipe wall or panel
mounting, using optional hardware.
2-3. Model and suffix codes
G. Data protection : EEPROM for configuration and log-
book, 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 : meets council directive 89/336/EEC
- Emmission : meets EN 55022 Class A
- Immunity : meets EN 61000-6-2
L) Intrinsic safety
- ATEX
: EEx ib [ia] IIC T4 for Ta -10 to 55 ºC
EEx ib [ia] IIC T6 for Ta -10 to 40 ºC
II 2 (1) G
KEMA 00ATEX1069 X
- CSA : Ex ia CL I, DIV 1, GP ABCD,
T4 for Ta -10 to 55 ºC
T6 for Ta -10 to 40 ºC
Refer to Installation Drawing
SC202S CSA
- FM : IS CL I, DIV 1, GP ABCD
T4 for Ta -10 to 55 ºC
T6 for Ta -10 to 40 ºC
HAZ LOC per Control Drawing
FF1-SC202S-00
M) Non-Incendive
- FM : NI CL I, DIV 2, GP ABCD
T4 for Ta -10 to 55 ºC
T6 for Ta -10 to 40 ºC
HAZ LOC per Control Drawing
FF1-SC202S-00
- CSA : NI CL I, DIV 2, GP ABCD
T4 for Ta -10 to 55 ºC
T6 for Ta -10 to 40 ºC
Refer to Installation Drawing
SC202S CSA
- ATEX : EEx nA [L] IIC T4 for Ta -10 to 55 ºC
EEx nA [L] IIC T6 for Ta -10 to 40 ºC
II 3 G
KEMA 00ATEX1070 X
N. DD specification : The SC202 Device Description
is available enabling communications
with the Handheld Communicator
(HCC) and compatible devices.
Model Suffix Code Option code Description
SC202G Conductivity Transmitter, General Purpose version
SC202S Conductivity Transmitter, Intrinsic Safe version
Type - A Milli-amp (+HART) version
- F FOUNDATION ® Fieldbus version
- N Non-Incendive Milli-amp (+HART) version
- B Non-Incendive FOUNDATION ® Fieldbus version
- E Always E
Options /H Hood for Sun Protection
/U Pipe & Wall mounting hardware
/SCT Stainless steel tagplate
/Q Calibration certificate

Specifications 2-3
IM 12D7B3-E-H
Safe area
Output
Supply
SENSOR
terminal 11-16
+
_
G
Hazardous area Safe area
+
_
G
Protective
earth Protective
earth
+
_
Load
Resistance
Uo= 31.5 Volts DC
Io = 100 mA
Hazardous area
Protective
earth
+
_
24 volts DC Nominal
Supply Voltage.
SENSOR
terminal 11-16
EEX ib
Certified safety barrier or power supply
with Rint= 300Ω
(HART compatible)
Intrinsically safe design
II 2 (1) G EEX ib [ia] IIC: T4 for ambient temperature < 55 ºC
T6 for ambient temperature < 40 ºC
Certificate nr. KEMA 00 ATEX 1069 X
EXA SC202S analyzer
Uo= 31.5 Volts DC
Io = 100 mA
Po = 1.2 Watt
EEX ib Certified Repeater
Power supply
(HART compatible)
Intrinsically safe design
II 2 (1) G EEX ib [ia] IIC: T4 for ambient temperature < 55 ºC
T6 for ambient temperature < 40 ºC
Certificate nr. KEMA 00 ATEX 1069 X
EXA SC202S analyzer
Zone 0 or 1 Zone 1
Zone 0 or 1 Zone 1
Figure 1
Figure 2
• Sensor(s) are of a passive type to be regarded as ‘simple apparatus’, devices which comply with clause 1.3 of the EN 50014.
• Electrical data of the EXASC202S.
- Supply and output circuit (terminals + and -):
Maximum input voltage Ui= 31.5 V.
Maximum input current Ii= 100 mA.
Maximum input power Pi= 1.2 W
Effective internal capacitance Ci= 22 nF.
Effective internal inductance Li= 22 µH.
- Sensor input circuit (terminals 11 through 16):
Maximum output voltage Uo= 14.4 V.
Maximum output current Io= 12.8 mA.
Maximum allowed external capacitance C0= 103 nF.
Maximum allowed external inductance Lo= 200 mH.
• Barriers and power supply specification must not exceed the maximum values as shown in the diagram above. These safety
descriptions cover most of the commonly used industry standard barriers, isolators and power supplies.
• The Hand Held Communicator must be of a ATEX certified intrinsically safe type in case it is used on the intrinsically safe circuit in
the hazardous area or of a ATEX certified non-incendive type in case it is used in the non-incendive circuit in the hazardous area.
ATEX intrinsic safe and non-incendive diagrams for SC202S-A
2-3. Connection diagrams for power supply

2-4 Specifications
IM 12D7B3-E-H
Safe area
Output
Supply
SENSOR(S)
terminal 11-16
+
_
G
Hazardous area Safe area
+
_
G
Protective
earth Protective
earth
+
_
Load
Resistance
Hazardous area
Protective
earth
+
_
24 volts DC Nominal
Supply Voltage.
SENSOR(S)
terminal 11-16
CSA certified
Safety barrier or power supply
(Hart compatible)
Intrinsically safe design
CSA Ex ia Class I, Div. 1, Group ABCD, T4 for ambient temp. < 55 ºC
EXA SC202S analyzer T6 for ambient temp. < 40 ºC
CSA certified
Power supply
(Hart compatible)
For electrical data:
see text below
For electrical data:
see text below
Suitable values are:
Vmax = 31.5 Volts DC
Imax = 100 mA
Suitable values are:
Vmax = 31.5 Volts DC
Imax = 100 mA
Pmax = 1.2 Watt
Intrinsically safe design
CSA Ex ia Class I, Div. 1, Group ABCD, T4 for ambient temp. < 55 ºC
EXA SC202S analyzer T6 for ambient temp. < 40 ºC
with Rint = 300 Ohm
Figure 1
Figure 2
• Sensor is a thermocouples, RTD’s, passive resistive switch devices, or is CSA entity approved and meet connection requirements.
• Electrical data of the EXA SC202S :
- Supply and output circuit (terminals + and -)
Maximum input voltage Vmax = 31.5 V.
Maximum input current Imax = 100 mA.
Maximum input power Pmax = 1.2 W.
Effective internal capacitance Ci= 22 nF.
Effective internal inductance Li= 22 µH.
- Sensor input circuit (terminals 11 through 16):
Maximum output voltage Voc = 14.4 V.
Maximum output current Isc = 12.8 mA.
Maximum allowed external capacitance Ca= 103 nF.
Maximum allowed external inductance La= 200 mH.
• Barriers and power supply should be CSA certified. The specifications must not exceed the maximum values as shown in the dia-
gram above. Installation should be in accordance with Canadian Electrical Code, Part I or CEC, Part I.
Maximum safe area voltage should not exceed 250 VRMS.
For Class I, Div. 2, Group ABCD the CSA certified barrier is not required, and the Sensor input circuit (terminals 11 through 16) is
non-incendive having the parameters:
Maximum output voltage Voc = 14.4 V.
Maximum output current Isc = 12.8 mA.
Maximum allowed external capacitance Ca= 1.4 µF.
Maximum allowed external inductance La= 900 mH.
• The Hand Held Communicator must be of a CSA certified intrinsically safe type in case it is used on the intrinsically safe circuit in
the hazardous area, or of a CSA certified non-incendive type in case it is used on the non-incendive circuit in the hazardous area.
CSA intrinsic safe and non-incendive diagrams for SC202S-A

IM 12D7B3-E-H
2-5 Specifications
Unclassified Location
Output
Supply
+
_
G
Classified Location
Protective
earth
+
_
FM Approved
Power supply
(HART compatible)
Intrinsically safe design
FM Class I. Div. 1, Group ABCD: T4 for ambient temperature < 55 ºC
T6 for ambient temperature < 40 ºC
EXA SC202S analyser
see text below
For electrical data:
Classified Location Unclassified Location
+
_
G
Protective
earth Protective
earth
+
_
Load
Resistance
24 volts DC Nominal
Supply Voltage.
Safety barrier or power supply
(HART compatible)
Intrinsically safe design FM Approved
FM Class I. Div. 1, Group ABCD: T4 for ambient temperature < 55 ºC
T6 for ambient temperature < 40 ºC
EXA SC202S analyser
with Rint = 300 Ω
For electrical data:
see text below
SENSOR(S)
terminal 11-16
Max. cable length: 60 mtr.
Cable diam.: 3 to 12mm
SENSOR(S)
terminal 11-16
Max. cable length: 60 mtr.
Cable diam.: 3 to 12mm
Figure 1
Figure 2
Suitable values are:
Voc or Vt ≤ 31.5 Volt DC
lsc or lt ≤ 100 mA
Psc or Pt ≤ 1.2 Watt
Suitable values are:
Voc or Vt ≤ 31.5 Volt DC
Isc or It ≤ 100 mA
• Electrical data of the EXA SC202S:
- Supply circuit (terminals + and -): - Sensor input circuit (terminals 11 through 16):
Maximum input voltage Vmax = 31.5 V. - Maximum output voltage Vt= 14.4 V.
Maximum input current Imax = 100 mA. - Maximum output current It= 12.8 mA.
Maximum input power Pi= 1.2 W. - Maximum allowed external capacitance Ca= 103 nF.
Effective internal capacitance Ci= 22 nF. - Maximum allowed external inductance La= 200 mH.
Effective internal inductance Li= 22 µH.
• If Hand Held Terminal (HHT) is not connected to the power supply lines of the EXA SC202S (see figure 1):
Any FM Approved barrier or power supply may be used that meets the following requirements.
Voc or Vt≤31.5 V; Isc or It≤100 mA; Ca≥22 nF + Ccable; La≥22 µH + Lcable
If HHT is connected to the power supply lines of the EXA SC202S (see figure 2):
The Hand Held Terminal must be FM Approved. Refer to the manufacturers control drawing of the HHT and the barrier/power
supply to determine the cable parameters.
(Voc or Vt) + VHHT ≤31.5 V; (Isc or It) + IHHT ≤100 mA; Ca≥22 nF + Ccable+ CHHT; La≥22 mH + Lcable+ LHHT
When installing this equipment, follow the manufacturer’s installation drawing.
Installation should be in accordance with ANSI/ISA RP 12.06.01 "Installation of Intrinsically Safe Systems for Hazardous
(Classified) Locations" and the National Electrical Code (ANSI/NFPA 70).
Control equipment connected to the barrier/power supply must not use or generate more than 250 Vrms or Vdc.
• Resistance between Intrinsically Safe Ground and earth ground must be less than 1.0 Ω
WARNING
- Substitution of components may impair Intrinsic Safety
To prevent ignition of flammable or combustible atmospheres, disconnect power before servicing or read, understand and
adhere to the manufacturer’s’live maintenance procedures.
FM intrinsic safe diagrams for SC202S-A

IM 12D7B3-E-H
Unclassified Location
+
_
G
Classified Location
Protective
earth
Intrinsically safe design
FM Class I. Div. 2. Group ABCD: T4 for ambient temperature < 55 ºC
T6 for ambient temperature < 40 ºC
EXA SC202S analyser
see text below
For electrical data:
SENSOR(S)
terminal 11-16
Max. cable length: 60 mtr.
Cable diam.: 3 to 12mm
Classified Location Unclassified Location
+
_
G
Protective
earth
+
_
Load
Resistance
FM approved power supply
VOC ≤ 31.5 VDC
Intrinsically safe design
FM Class I. Div. 2, Group ABCD: T4 for ambient temperature < 55 ºC
T6 for ambient temperature < 40 ºC
EXA SC202S analyser
For electrical data:
see text below
SENSOR(S)
terminal 11-16
Max. cable length: 60 mtr.
Cable diam.: 3 to 12mm
FM approved power supply
VOC ≤ 31.5 VDC
+
_
Figure 2
Figure 1
• Electrical data of the EXA SC202S:
- Supply circuit (terminals + and -): - Sensor input circuit (terminals 11 through 16):
Maximum input voltage Vmax = 31.5 V. Maximum output voltage Vt= 14.4 V.
Maximum input power Pi= 1.2 W Maximum output current It= 12.8 mA.
Effective internal capacitance Ci= 22 nF Maximum allowed external capacitance Ca= 1.4 µF.
Effective internal inductance Li= 22 µH Maximum allowed external inductance La= 900 mH.
• The Hand Held Terminal must be FM Approved in case it is used in the classified location.
When installing this equipment, follow the manufacturers installation drawing. Installation shall be in accordance with Article
501.4(B) of the National Electrical Code (ANSI/NFPA 79).
Nonincendive field wiring may be installed in accordance with Article 501.4(B)(3)
• Grounding shall be in accordance with Article 250 of the National Electrical code
WARNING
- Substitution of components may impair suitability for Division 2
- Do not remove or replace while circuit is live unless area is know to be non-hazardous
- Explosion Hazard – Do not disconnect equipment unless area is know to be non-hazardous
- Do not reset circuit breaker unless power has been removed from the equipment or the area is know to be non-hazardous
FM non-incendive diagrams for SC202S-N

IM 12D7B3-E-H
Installation and wiring 3-1
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 instru-
ment 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)
Fig. 3-2. Panel mounting diagramFig. 3-1. Housing dimensions and layout of
glands
115 (4.5)
92 (3.6)
162 (6.4)
180 (7)
56±0.2
(2.20) M6 bolts (2x)
30 (1.2)
1/2"INPUT
1/2"SUPPLY
min. 203
(min. 8.0) 154
(6.06) 30 (1.18)
2x ø4
(0.16)
SPACING PANEL
CUT-OUT DIMENSIONS
CUT-OUT DIMENSION
172
(6.77)
min.229
(min.9.0)
30 (1.18)

115 (4.5)
92 (3.6)
2"ND pipe
OPTION /U: Universal pipe/wall mounting
wall mounting pipe mounting pipe mounting
(vertical) (horizontal)
2x ø6.5
(0.26)
4x ø10
(0.4)
200
(7.87)
70
(2.75)
56
(2.20)
IM 12D7B3-E-H
3-2 Installation and wiring
Figure 3-4. Internal view of EXA wiring compartment
Figure 3-3. Wall and pipe mounting diagram

IM 12D7B3-E-H
Installation and wiring 3-3
3-2. Preparation
Refer to figure 3-4. The power/output connections and the sensor connections should be made in accor-
dance 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).
Figure 3-5. Glands to be used for cabling
SENSOR
CABLE GLAND
POWER/OUTPUT
CABLE GLAND
GROUNDING TERMINAL

IM 12D7B3-E-H
3-4 Installation and wiring
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 fol-
lowing 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.
INPUT
OUTPUT/SUPPLY
Safety Barrier
SC202S only
SENSORS
2,5 or 10 m
DISTRIBUTOR
RECORDER
COMPUTER HAND HELD
COMMUNICATOR
CURRENT OUTPUT
NO MODEYES
ENT
>
FAILHOLD
YES NO ENT
MEASURE
MAN.CAL
DISPLAY
HOLD
YOKOGAWA
MODE
TEMP
AUT.CAL
12
1 2
180
18 0
100
100
0
>

Installation and wiring 3-5
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 specifi-
cations given.
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 mm2and an outside
diameter of 7 to 12 mm. The cable gland supplied with the instrument accepts these diameters. The maxi-
mum 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 sup-
ply/
output cable to the transmitter. Connect the supply to the terminals marked +, - and G as is indicated in fig-
ures 3-11.
3-4-3. Switching the instrument on
After all connections are made and checked, the power can be switched on from the distributor. Observe
the correct activation of the instrument at the display. If for any reason the display does not indicate a value,
consult the trouble shooting section.
IM 12D7B3-E-H
WARNING
11
12
13
14
15
16
12
3
5
6
4
white
brown
green
yellow
grey
pink
Fig. 3-7. Connection diagrams

3-6 Installation and wiring
IM 12D7B3-E-H
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 identifi-
cation 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.
3-6. Sensor connection using junction box and extension cable
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 exten-
sion cable should be used. These items are manufactured to a very high standard and are necessary to
ensure that the specifications of the system can be met. The total cable length should not exceed 60
metres (e.g. 10 m fixed cable and 50 m extension cable).
NOTE:
Numbers 17 of both WF10 and BA10 do not need to be used.
11 TEMPERATURE
12 TEMPERATURE
13 CELL
14 CELL
15 CELL
16 CELL
CONDUCTIVITY/RESISTIVITYTRANSMITTER
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
RED
11 TEMPERATURE
12 TEMPERATURE
13 OUTER ELECTRODE
14 OUTER ELECTRODE
15 INNER ELECTRODE
16 INNER ELECTRODE
YELLOW /GREEN
BROWN
BROWN
1
2
1
2
SX42-SX . . - . F SENSORS
Figure 3-9. Sensor wiring diagrams