YOKOGAWA PH202G User Manual

User’s
Manual

Model PH202G (S)
pH Transmitter

IM 12B6C3-E-E

12th Edition

Y

OKOGAWA

IM 12B6C3-E-E

TABLE OF CONTENTS

PREFACE

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

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

1-1

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

2. PH202 SPECIFICATIONS ............................................................................................................. 2-1

2-1. Genera• ................................................................................................................................... 2-1

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

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

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

2-5. Connection diagrams for power supply .................................................................................... 2-5

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 .......................................... 3-4

3-3-3. Hazardous area non-incendive PH 202S-N ................................................................ 3-4

3-3-4. Liquid earth ................................................................................................................. 3-5

3-3-5. Access to terminal and cable entry ............................................................................. 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 ........................................................................................ 3-6

3-5. Wiring the sensor system ......................................................................................................... 3-7

3-5-1. Impedance measurement jumper settings .................................................................. 3-7

3-6. Sensor wiring ........................................................................................................................... 3-8

3-6-1. Connection cable ........................................................................................................ 3-9

3-6-2. Sensor cable connection with special grommet ........................................................ 3-10

3-6-3. Sensor cable connections using junction box (BA10) and extension cable (WF10) ... 3-11

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

4-5-1. Display functions pH (default) ...................................................................................... 4-4

4-5-2. Display functions pH (ORP) ......................................................................................... 4-5

4-5-3. Display functions pH (rH) ............................................................................................. 4-6

5. PARAMETER SETTING ................................................................................................................

5-1

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

5-1-1. Manual temperature selection and adjustment ............................................................ 5-2

5-1-2. Process temperature measuring in ORP mode ........................................................... 5-3

5-1-3. Manual activation of HOLD .............................................................................................. 5-4

5-1-4. Manual impedance check ................................................................................................ 5-5

IM 12B6C3-E-E

5-2. Commissioning mode ................................................................................................................... 5-6

5-2-1. Output Range .................................................................................................................. 5-7

5-2-2. Hold ................................................................................................................................ 5-8

5-2-3. Service .......................................................................................................................... 5-10

5-3. Notes for guidance in the use of service coded settings ............................................................. 5-11

5-3-1. Parameter specific functions .......................................................................................... 5-12

5-3-2. Temperature compensation and measuring functions ................................................... 5-14

5-3-3. Calibration functions ...................................................................................................... 5-16

5-3-4. mA Output functions ..................................................................................................... 5-18

5-3-5. User interface ................................................................................................................ 5-20

5-3-6. Communication setup ................................................................................................... 5-22

5-3-7. Genera• ........................................................................................................................ 5-22

5-3-8. Test and setup mode .................................................................................................... 5-22

6. CALIBRATION ................................................................................................................................

6-1

6-1. Automatic calibration ............................................................................................................... 6-1

6-2. Manual calibration .................................................................................................................... 6-1

6-3. Sample calibration ................................................................................................................... 6-1

6-4. Data entry ................................................................................................................................ 6-1

6-5. Calibration procedures ............................................................................................................. 6-2

6-5-1. Automatic calibration .................................................................................................. 6-2

6-5-2. Automatic calibration with HOLD active ...................................................................... 6-3

6-5-3. Manual calibration (2nd parameter calibration) ............................................................ 6-4

6-5-4. Sample calibration ...................................................................................................... 6-6

7. MAINTENANCE ..............................................................................................................................

7-1

7-1. Periodic maintenance for the EXA 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

8-1-3. Error Codes ................................................................................................................ 8-3

9. SPARE PARTS ...............................................................................................................................

9-1

10. APPENDIX ..................................................................................................................................

10-1

10-1. User setting table ................................................................................................................. 10-1

10-2. Configuration checklist for PH202G ..................................................................................... 10-3

10-3. Set up for sensor compatibility ............................................................................................. 10-4

10-3-1. Genera• .................................................................................................................. 10-4

10-3-2. Selection of measurement and reference electrode ................................................ 10-4

10-3-3. Selecting a temperature sensor .............................................................................. 10-4

10-4. Set up for other functions .................................................................................................... 10-5

10-5. Set up for Pfaudler Type 18 sensor ..................................................................................... 10-6

10-5-1. General set up ........................................................................................................ 10-6

10-5-2. Calibration set up .................................................................................................... 10-6

10-6. Device Description (DD) menu structure ............................................................................... 10-7

10-7. Field Change Order .............................................................................................................. 10-8

11. TEST CERTIFICATE ...................................................................................................................

10-1

In this manual a

mA

sign appears if it concerns the pH202G(S)-E/C/U/N

IM 12B6C3-E-E

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.

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.

WARNING

CAUTION

Introduction 1-1

IM 12B6C3-E-E

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.

Figure 1-1. Nameplate

N200

pH / ORP TRANSMITTER

PROFIBUS - PA

-10 TO 55 ºC

SUPPLY

OUTPUT

AMB.TEMP. [Ta]

SERIAL No.

EEx ib [ia] IIC T4 for Ta -10 to 55 ºC
EEx ib [ia] IIC T6 for Ta -10 to 40 ºC
KEMA 00ATEX1068 X

IS CL I, DIV 1, GP ABCD
T3B for Ta -10 to 55 ºC

T4 for Ta -10 to 40 ºC

MODEL

EXA PH202S

0344

II 2 (1) G

24VDC/250mA/1,2W

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

Li=2,6µH Ci=737pF

or

HAZ LOC per Control Drawing
FF1-PH202S-00

Amersfoort,
The Netherlands

PH202S CSA

WARNING

Substitution of
components may impair
intrinsic safety

AVERTISSEMENT

La substitution de composants
peut compromettre la sècurite
intrinsëque.

Refer to Installation Drawing

T4 for Ta -10 to 55 ºC
T6 for Ta -10 to 40 ºC

Ex ia CL I, DIV 1, GP ABCD,

IM 12B6C3-E-E

1-2 Introduction

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.

Basic Parts List: Transmitter PH202
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,

together with a second link for impedance selection.

1-2. Application

The EXA converter 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/neutralization
system.

Yokogawa designed the EXA analyzer to withstand harsh environments. The converter 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 converter
in order to ensure easy calibration and peak performance. If the unit must be mounted remotely from the
sensors, WF10 extension cable can be used up to a maximum of 50 metres (150 feet) with a BA10 junction
box. Except installations with dual high impedance sensors, where the maximum cable length is 20 metres
using integral cable only (no 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 10). 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 eight different types of
temperature sensors.

To record such configuration adjustments, write changes in the space provided in Chapter 10 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.

Y = Year M = Month

2000 M January 1
2001 N February 2
2002 P March 3
2003 R Apri• 4

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

2008 W September 9
2009 X October O
2010 A November N
2011 B December D

IM 12B6C3-E-E

2-1. General
A. Input specifications
: Dual high impedance inputs

(2 x 1013) with provision
for liquid earth connection.
Suitable for inputs from glass
or enamel pH & reference
sensors and ORP metal
electrodes.

B. Input ranges

- pH : -2 to 16 pH

- ORP : -1500 to 1500 mV

- rH : 0 to 55 rH

- Temperature : -30 ºC - 140 ºC (-20 - 300 ºF)

- 8k55 sensor : -10 ºC - 120 ºC (10 - 250 ºF)

- PTC10k : -20 ºC - 140 ºC (0 - 300 ºF)

C. Span

- pH : min 1 max 20 pH

- ORP : min 100 max 3000 mV

- rH : min 2 max 55 rH

D. Output signa• : 4-20 mA loop powered,

isolated from input,
maximum load 425  at 24 V
DC. With the possibility of
22 mA “FAIL” signal (burn up)
and 3.9 mA (burn down).

E. Temperature compensation

- Range : Automatic or manual
compensation to Nernst
equation.
Process compensation by
configurable coefficient.
Compensation for total range
of selected temperature
sensors (see B)
Adjustable ITP (Iso-thermal
point of intersection).

F. Calibration : Semi-automatic using pre-

configured NIST buffer tables
4, 7 & 9, of with user defined
buffer tables, with automatic
stability check.
Manual adjustment to grab
sample.
Slope and Asymmetry
Potential setting.
Zero point can be selected for
calibration and display instead
or As. Pot. (IEC746-2)

G. Serial communication

: Bi-directional HART® digital

communication superimposed
on the 4-20 mA signal.

H. Logbook : Software record of important

events and diagnostic data.
Available through HART
link, with key diagnostic
information available in the
display.

I. Display : Custom liquid crystal display,

with a main display of 31/2
digits 12.5 mm high.
Message display of 6
alphanumeric characters, 7
mm high.
Warning flags and units (pH
and mV).

J. Power supply : Nominal 24 volt DC loop

powered system.

- PH202G : Up to 40 volts.

- PH202S : 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.

2. PH202 SPECIFICATIONS

Fig. 2-1. Supply voltage/ load diagram

Fig. 2-2. Minimum terminal voltage at the PH202

0.0

20

0.0

40

0.0

60

0.0

80

0.0

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

Te

rminal voltage (V)

Output Current (mA)

mA

mA

Specification 2-1

mA

IM 12B6C3-E-E

2-2 Specification

K. Input isolation : 1000V DC

2-2. Operating specifications
A. Performance : pH

- Linearity :

0.01 pH ± 0.02 mA

- Repeatability : <0.01 pH ± 0.02 mA

- Accuracy : 0.01 pH ± 0.02 mA

Performance : ORP

- Linearity : 1 mV ± 0.02 mA

- Repeatability : <1 mV ± 0.02 mA

- Accuracy : 1 mV ± 0.02 mA
Performance :

Temperature with Pt1000 ,

3U Balco, 5k U, 35 U, 6k U ,

PTC10k & 8k55

- Linearity : 0.3 ˚C ± 0.02 mA

- Repeatability : <0.1 ˚C ± 0.02 mA

- Accuracy : 0.3 ˚C ± 0.02 mA

Performance : Temperature with Pt100 

- Linearity : 0.4 ˚C ± 0.02 mA

- Repeatability : <0.1 ˚C ± 0.02 mA

- Accuracy : 0.4 ˚C ± 0.02 mA

B. Ambient operating temperature

: -10 to + 55 ˚C (10 to 131 ˚F)

Excursions to -30˚C (-20
˚F) do not influence the
current output function, and
excursions to + 70˚C (160˚F)
are acceptable too.

C. Storage temperature
: -30 to +70 ˚C (-20 to 160 ˚F)

D. Humidity : 10 to 90% RH

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 mm2 finished
wires. Weather resistant to
IP65 and NEMA 4X standards.
Pipe wall or panel mounting,
using optional hardware.

G. 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 approximately

2.5 kg (5lb).

H. Data protection : EEPROM for configuration and

logbook, and lithium cell for
clock.

I. Watchdog timer : Checks microprocessor

J. Automatic safeguard
: Return to measuring mode

when no keystroke is made
for 10 min.

K. Operation protection

: 3-digit programmable

password.

L. Sensor impedance checking

: Independent impedance

check on measuring
and reference sensor
elements, with temperature
compensation. Display
of sensor impedance on
message line of display. FAIL
flag in event of “out of limits”
impedance, and the possibility
of 22 mA or 3.9 mA error
signal.

M. DD Specification

: The PH202 Device
Description is available ena­ bling communications with
the Handheld communicator

(HHC) and compatible
devices. For more information
contact your local Yokogawa
sales offices.

mA

IM 12B6C3-E-E

Mode• Suffix Code Option code Description

PH202G PH/ORP Transmitter, General Purpose version
Type - E Milli-amp (+HART) version, European style

- C Milli-amp (+HART) version, Canadian style

- U Milli-amp (+HART) version, North American style

- F FOUNDATION ® Fieldbus version

- P Profibus PA version

- E Always E
Options /H Hood for Sun Protection
/U Pipe & Wall mounting hardware
/SCT Stainless steel tagplate
/Q Calibration certificate

Mode• Suffix Code Option code Description

PH202S PH/ORP Transmitter, Intrinsic Safe version
Type - E Milli-amp (+HART) version, European style

- C Milli-amp (+HART) version, Canadian style

- U Milli-amp (+HART) version, North American style

- F FOUNDATION ® Fieldbus version

- P Profibus PA version

- N Non-Incendive Milli-amp (+HART) version

- B Non-Incendive FOUNDATION ® Fieldbus version

- D Non-Incendive Profibus PA version

- E Always E
Options /H Hood for Sun Protection
/U Pipe & Wall mounting hardware
/SCT Stainless steel tagplate
/Q Calibration certificate

2-3. Model and suffix codes

N. Regulatory compliance

- EMC : meets council directive 89/336/EEC

- Emmission : meets EN 55022 Class A

- Immunity : meets EN 61000-6-2

O. 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 00ATEX1068 X

- CSA : Ex ia CL 1, DIV 1, GP C&D,
T3C for Ta -10 to 55 ºC
Refer to Installation Drawing
PH202S CSA

- FM : IS CL 1, DIV 1, GP ABCD
T3B for Ta -10 to 55 ºC
T4 for Ta -10 to 40 ºC
HAZ LOC per Control Drawing
FF1-PH202S-00

P. Non-Incendive

- FM : NI CL 1, DIV 2, GP ABCD

T3B for Ta -10 to 55 ºC
T4 for Ta -10 to 40 ºC
HAZ LOC per Control Drawing
FF1-PH202S-00

- 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 00ATEX1115 X

Specification 2-3

IM 12B6C3-E-E

2-4 Specification

Stamp Company : Stamp Certification Institute :

Signature : Remarks :

Model EXA PH202S

Title : Control Drawing PH202S Cenelec

Number : FF1-PH202S-00 Page : 1 of 10

Revision : 5.4

EXA PH202S

(pH/ORP-transmitter)

Safe area

Uo = 31.5 Volt DC

Io = 100 mA

Po = 1.2 Watt

EEX ib Certified Repeater

Power Supply

(HART Compatible)

Output

Supply

SENSOR(S)

terminals 11-19

+_G

SENSOR(S)

terminals 11-19

Zone 0 or 1 Zone 1

Hazardous area

Safe area

+_G

Protective

earth

Protective

earth

Intrinsically safe design

CENELEC standard EEX ib [ia] IIC: T4 for ambient temp. < 55¡C

T6 for ambient temp. < 40¡C

Certificate nr. 00ATEX1068 X

EXA PH202S

+

_

Load

Resistance

EEX ib

Certified safety barrier or power

with Rint=300

Ω

Io = 100 mA

Uo = 31.5 Volt DC

Zone 0 or 1

Zone 1

Hazardous area

Protective

earth

+

_

24 volts DC Nominal

Supply Voltage.

Intrinsically safe design

CENELEC standard EEX ib [ia] IIC: T4 for ambient temp. < 55¡C

T6 for ambient temp.< 40¡C

Certificate nr. 00ATEX1068 X

(HART compatible)

(pH/ORP-transmitter)

• 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 EXAPH202S.

- Supply and output circuit (terminals + and -):

Maximum input voltage U

i

= 31.5 V.

Maximum input current I

i

= 100 mA.

Maximum input power P

i

= 1.2 W.

Effective internal capacitance C

i

= 22 nF.

Effective internal inductance L

i

= 22 µH.

- Sensor input circuit (terminals 11 through 19):

Maximum output voltage U

o

= 14.4 V.

Maximum output current I

o

= 32.3 mA.

Maximum allowed external capacitance C

o

= 600 nF.

Maximum allowed external inductance L

o

= 36 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.

YOKOGAWA EUROPE B.V.

Date : 01/07/2004

IM 12B6C3-E-E

Specification 2-5

Stamp Company : Stamp Certification Institute :

Signature : Remarks :

Model EXA PH202S

Title : Control Drawing PH202S Cenelec

Number : FF1-PH202S-00 Page : 2 of 10

Revision : 5.4

YOKOGAWA EUROPE B.V.

Date : 01/07/2004

〈 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 EXA PH202S-F & PH202S-P:

- Supply and output circuit::

Maximum input voltage Ui=24 V or Maximum input voltage Ui=17.5 V

Maximum input current Ii=250 mA Maximum input current Ii=380 mA

Maximum input power Pi=1.2 W Maximum input power Pi=5.32 W

Effective internal capacitance Ci=737 pF; Effective internal i nductance Li=2.6

µH.

- Sensor input circuit:

Maximum output voltage Uo=14.4V; Maximum output current Io=32.3 mA

Maximum allowed external capacitance Co=600 nF

Maximum allowed external inductance Lo=36 mH

〈 Any I.S. interface may be used that meets the followi ng requirements:

Uo

≤ 24 V or Uo ≤ 17.5 V

Io

≤ 250 mA Io ≤ 380mA

Po ≤ 1.2 W Po ≤ 5.32 W

Ca

? 737 pF + Ccable; La ? 2.6 µH + Lcable

Safe area

Hazardous area

Zone 1

Zone 0 or 1

Safe area

Apparatus

I.S.

interface

I.S.

certified

Terminator

Sensor

Connections

Ui

=

24 V or Ui

=

17,5 V

Ii

=

250 mA Ii

=

380 mA

Pi

= 1,2 W Pi

=

5,32 W

EEx ib [ia] IIC Certificate no. 00ATEX1068 X

T4 for ambient temp.

≤ 55 ϒC

T6 for ambient tem

p

. ≤ 40 ϒC

EXA

PH202S-F

& PH202S-P

IM 12B6C3-E-E

2-6 Specification

Stamp Company : Stamp Certification Institute :

Signature : Remarks :

Model EXA PH202S

Title : Installation Drawing PH202S CSA

Number : FF1-PH202S-00 Page : 3 of 10

Revision : 5.4

Safe area

Vmax = 31.5 VoltDC

Imax = 100 mA

Pmax = 1.2 Watt

CSA certified

Power Supply

(HART compatible) )

Output

Supply

SENSOR(S)

terminals 11-19

+_G

SENSOR(S)

terminals 11-19

Hazardous area

Safe area

+_G

Protective

earth

Protective

earth

Intrinsically safe design

(pH/ORP-transmitter)

EXA PH202S

+

_

Load

Resistance

Imax = 100 mA

Vmax = 31.5 VoltDC

Hazardous area

Protective

earth

+

_

24 volts DC Nominal

Supply Voltage.

Intrinsically safe design

CSA Ex ia Class1, Div.1, Group C&D, T3C for ambient temp. < 55¡C

(pH/ORP-transmitter)

EXA PH202S

CSA certified

safety barrier or power supply

Suitable values are:

(HART compatible)

CSA Ex ia Class1, Div.1, Group C&D, T3C for ambient temp. < 55¡C

For electrical data:

see text below.

For electrical data:

see text below.

Suitable values are:

• Sensor(s) are thermocouples, RTD s, passive resistive switch devices, or are CSA entity approved and meet

connection requirements.

• Electrical data of the EXA PH202S.

- Supply and output circuit (terminals + and -):

Maximum input voltage V

max

= 31.5 V.

Maximum input current I

max

= 100 mA.

Effective internal capacitance C

i

= 22 nF.

Effective internal inductance L

i

= 22 µH.

- Sensor input circuit (terminals 11 through 19):

Maximum output voltage V

oc

= 14.4 V.

Maximum output current I

sc

= 32.3 mA.

Maximum allowed external capacitance Ca = 600 nF.

Maximum allowed external inductance La = 36 mH.

• Barriers and power supply should be CSA certified. The specifications must not exceed the maximum values as

shown in the diagram above.

Installation should be in accordance with Canadian Electrical Code, Part I or CEC, Part I.

Maximum safe area voltage should not exceed 250 V

RMS

.

• 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.

YOKOGAWA EUROPE B.V.

Date : 01/07/2004

IM 12B6C3-E-E

Specification 2-7

Stamp Company : Stamp Certification Institute :

Signature : Remarks :

Model EXA PH202S

Title : Installation Drawing PH202S CSA

Number : FF1-PH202S-00 Page : 4 of 10

Revision : 5.4

YOKOGAWA EUROPE B.V.

Date : 01/07/2004

〈 Sensor(s) are a thermocouple, RTD’s, passive resistive switch devices, or is CSA entity

approved and meet connection requirements.

〈 Electrical data of the EXA PH202S-F & PH202S-P:

- Supply and output circuit::

Maximum input voltage Vmax=24 V or Maximum input voltage Vmax=17.5 V

Maximum input current Imax=250 mA Maximum input current Imax=380 mA

Maximum input power Pmax=1.2 W Maximum input power Pmax=5.32 W

Effective internal capacitance Ci=737 pF; Ef fective internal inductance Li=2.6

µH.

- Sensor input circuit:

Maximum output voltage Voc=14.4V; Maximum output current Isc=32.3 mA

Maximum allowed external capacitance Ca=600 nF

Maximum allowed external inductance La=36 mH

〈 Any CSA approved I.S. interface m ay be used that meets the following requirements:

Vmax

≤ 24 V or Vmax ≤ 17.5 V

Imax

≤ 250 mA Imax ≤ 380mA

Pmax

≤ 1.2 W Pmax ≤ 5.32 W

Ca

? 737 pF + Ccable; La ? 2.6 µH + Lcable

Installation should be in accordance with Canadian Electrical Code, Part I or CEC, Part I.

Maximum safe area voltage should not exceed 250 Vrms.

Safe area

Hazardous area

Zone 1

Zone 0 or 1

Safe area

Apparatus

I.S.

interface

I.S.

certified

Terminator

EXA

PH202S-F

& PH202S-P

Sensor

Connections

V

m

ax

= 24 V or V

max

= 17,5 V

I

max

= 250 mA I

max

= 380 mA

P

m

ax

= 1,2 W P

max

= 5,32 W

CSA Ex ia Class I, DIV. 1, Group C&D

T3C for ambient temp.

≤ 55 ϒC

IM 12B6C3-E-E

2-8 Specification

Stamp Company : Stamp Certification Institute :

Signature : Remarks :

Model EXA PH202S

No revision to drawing without prior

FM Approval

Title : FM Control Drawing PH202S (Intrinsic Safety)

Number : FF1-PH202S-00 Page : 5 of 10

Revision : 5.4

Sensor(s)

terminals 11-19

Max. cablelength: 60 mtr.

Cable dia. : 3 12 mm.

Sensor(s)

terminals 11-19

Max. cablelength: 60 mtr.

Cable dia.: 3 12 mm.

n classified Location

FM Approved

Power Supply

(HART compatible)

Output

Supply

+_G

Classified Location

Unclassified Location

+_G

Protective

earth

Protective

earth

Intrinsically safe design

FM Class I, Div.1, Group ABCD, T3B for ambient temp. < 55¡C

T4 for ambient temp. < 40¡C

EXA PH202S analyser

+

-

Load

Resistance

Classified Location

Protective

earth

+

_

24 volts DC Nominal

Supply Voltage.

FM Approved safety barrier or

power supply

with Rint = 300

Ω

(HART compatible)

For electrical data:

see text below.

For electrical data:

see text below.

Intrinsically safe design

FM Class I, Div.1, Group ABCD, T3B for ambient temp. < 55¡C

T4 for ambient temp. < 40¡C

EXA PH202S analyser

Figure 1

Figure 2

• Electrical data of the EXA PH202S :

- Supply circuit (terminals + and -): - Sensor input circuit (terminals 11 through 19):

Maximum input voltage V

max

= 31.5 V. Maximum output voltage V

t

= 14.4 V.

Maximum input current I

max

= 100 mA. Maximum output current I

t

= 32.3 mA.

Maximum input power P

i

= 1.2 W. Maximum allowed external capacitance C

a

= 600 nF.

Effective internal capacitance C

i

= 22 nF. Maximum allowed external inductance L

a

= 36 mH.

Effective internal inductance L

i

= 22 µH.

• If Hand Held Terminal (HHT) is not connected to the power supply lines of the EXA PH202S (see figure 1):

Any FM Approved barrier or power supply may be used that meets the following requirements.

V

oc

or V

t

≤ 31.5 V; I

sc

or I

t

≤ 100 mA; C

a

≥ 22nF + C

cable

; L

a

≥ 22µH + L

cable

If HHT is connected to the power supply lines of the EXA PH202S (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.

(V

oc

or V

t

) + V

HHT

≤ 31.5 V; (I

sc

or I

t

) + I

HHT

≤ 100 mA; C

a

≥ 22nF + C

cable

+ C

HHT

; L

a

≥ 22µH + L

cable

+ L

HHT

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 Ohm.

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.

YOKOGAWA EUROPE B.V.

Date : 01/07/2004

IM 12B6C3-E-E

Specification 2-9

Stamp Company : Stamp Certification Institute :

Signature : Remarks :

Model EXA PH202S-N

No revision to drawing without prior

FM Approval

Title : FM Control Drawing PH202S-N (Non-incendive)

Number : FF1-PH202S-00 Page : 6 of 10

Revision : 5.4

Sensor(s)

terminals 11-19

Max. cablelength: 60 mtr.

Cable dia. : 31 2 mm.

Sensor(s)

terminals 11-19

Max. cablelength: 60 mtr.

Cable dia.: 3 12 mm

n classified Location

+_G

Classified Location

Unclassified Location

+_G

Protective

earth

Intrinsically safe design

FM Class I, Div.2, Group ABCD, T3B for ambient temp. < 55¡C

T4 for ambient temp. < 40¡C

EXA PH202S analyser

+

-

Load

Resistance

Classified Location

Protective

earth

FM Approved

power supply

Voc

¡Ü 31.5 VDC

For electrical data:

see text below.

For electrical data:

see text below.

Intrinsically safe design

FM Class I, Div.2, Group ABCD, T3B for ambient temp. < 55¡C

T4 for ambient temp. < 40¡C

EXA PH202S analyser

+

-

FM Approved

power supply

Voc

¡Ü 31.5 VDC

• Electrical data of the EXA PH202S :

- Supply circuit (terminals + and -): - Sensor input circuit (terminals 11 through 19):

Maximum input voltage V

max

= 31.5 V. Maximum output voltage V

t

= 14.4 V.

Maximum input power Pi = 1.2 W Maximum output current I

t

= 32.3 mA.

Effective internal capacitance Ci = 22 nF Maximum allowed external capacitance C

a

= 600 nF.

Effective internal inductance Li = 22 H Maximum allowed external inductance L

a

= 36 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

YOKOGAWA EUROPE B.V.

Date : 01/07/2004

IM 12B6C3-E-E

2-10 Specification

Stamp Company : Stamp Certification Institute :

Signature : Remarks :

Model EXA PH202S-F & PH202S-P

No revision to drawing without prior

FM Approval

Title : FM Control Drawing PH202S-F & PH202S-P (Intrinsic safe Fisco

concept)

Number : FF1-PH202S-00 Page : 7 of 10

Revision : 5.4

YOKOGAWA EUROPE B.V.

Date : 01/07/2004

〈 Sensor(s) are of a passive type to be regarded as ’simple apparatus’, devices which neither store nor

generate voltages over 1.5 V, currents over 0.1 A, power over 25 mW or energy over 20

µJ, or are FM

Approvals entity approved and meet connection requirements.

〈 Electrical data of the EXA PH202S-F & PH202S-P:

- Supply circuit: Vmax=17,5 V; Imax=380 mA; Pi=5,32 W; Ci=737 pF; Li=2.6 µH.

- Sensor input circuit: Vt=14.4 V; It=32.3 mA; Ca=600 nF; La=36 mH

〈 Any FM Approved FISCO barrier may be used that meets the following requirements:

Voc or Vt

≤ 17,5 V; Ioc or It ≤ 380 mA; Poc or Pt ≤ 5,32 W

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).

Associated apparatus connected to the FISCO barrier must not use or generate more than 250 Vrms

o

r Vdc.

〈 Resistance between FISCO Intrinsically Safe Ground and earth ground must be less than 1.0 Ohm.

〈 The FISCO concept allows the interconnection of several I.S. apparatus not specifically examined in such

combination. The criterion for such interconnection is that the volta ge (Vmax), the current (Imax) and the

power (Pi) which I.S. apparatus can receive and remain intrinsically safe, considering faults, must be equal to

or greater that the voltage (Voc, Vt), the current (Ioc, It) and the power (Poc, Pt) which can be provided e by the

FM approved FISCO barrier. In addition, the maximum unprotected residual capacitance (Ci) and inductance

(Li) of each apparatus (other than the terminator) connected to the Fieldbus must be less than or equal to 5nF

and 10 H respectively.

〈 In each I.S. Fieldbus segment only one active source, normally the FM Approved FISCO barrier, is allowed

to provide the necessary power for the Fieldbus system. All other equipment connected to the bus cable has to

be passive (not providing energy to the system), except to a leakage current of 50 A for each connected

device. Seperately powered equipment needs a galvanic isolation to insure that the I.S. Fieldbus circuit

remains passive.

〈 The cable used to interconnect the devices needs to comply with the following parameters:

Loop resistance R : 15 150 /km; Inductance per unit length L : 0,4 1 mH/km

Capacitance per unit length C : 80 200 nF/km

(C = C line/line + 0,5 C line/screen if both line are floating)

(C = C line/line + C line/screen if the screen is connected to one line)

Length of spur cable: max. 30 m

Length of trunk cable: max. 1 km

Length of splice : max. 1 m

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.

Unclassified Location

Classified Location

Division 1

FM Approved

FISCO barrier

Voc (Vt) ¡Ü17,5 V

Ioc (It)

¡Ü 380 mA

Poc (Pt)

¡Ü 5,32 W

FM Approved

Terminator

R = 90..100

C = 0..2,2 F

EXA

PH202S-F

& PH202S-P

Sensor

Connections

Max. cablelength: 60 mtr.

Cable dia. : 3 1 2 mm.

FM Class I, DIV. 1, Group ABCD

T3B for ambient temp.

≤ 55 ϒC

T4 for ambient tem

p

. ≤ 40 ϒC

IM 12B6C3-E-E

Specification 2-11

Stamp Company : Stamp Certification Institute :

Signature : Remarks :

Model EXA PH202S-F & PH202S-P

No revision to drawing without prior

FM Approval

Title : FM Control Drawing PH202S-F & PH202S-P (Intrinsic safe Entity

concept)

Number : FF1-PH202S-00 Page : 8 of 10

Revision : 5.4

YOKOGAWA EUROPE B.V.

Date : 01/07/2004

〈 Sensor(s) are of a passive type to be regarded as ’simple apparatus’, devices which

neither store nor generate voltages over 1. 5 V, currents over 0.1 A, power over 25 mW or

energy over 20 µJ, or are FM Approvals entity approved and meet connection

requirements.

〈 Electrical data of the EXA PH202S-F & PH202S-P:

- Supply circuit:

Maximum input voltage Vmax=24 V

Maximum input current Imax=250 mA

Maximum input power Pi=1.2 W

Effective internal capacitance Ci=737 pF; Effective internal inductance Li=2.6

µH.

- Sensor input circuit:

Maximum output voltage Vt=14.4 V; Maximum output current It= 32.3 mA

Maximum allowed external capacitance Ca=600 nF

Maximum allowed external inductance La= 36 mH

〈 Any FM Approved barrier may be used that meets the following requirements:

Voc or Vt

≤ 24 V

Ioc or It ≤ 250 mA

Poc or Pt

≤ 1.2 W

Ca

? 737 pF + Ccable; La ? 2.6 µH + Lcable

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).

Associated apparatus connected to the barrier 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

Ohm.

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.

Unclassified Location

Classified Location

Division 1

FM Approved

barrier

Voc (Vt) ¡Ü24 V

Ioc (It)

¡Ü 250 mA

Poc (Pt)

¡Ü 1,2 W

Ca

¡Y 737pF+ Ccable

La

¡Y 2,6 H + Lcable

I.S.

certified

Terminator

EXA

PH202S-F

& PH202S-P

Sensor

Connections

Max. cablelength: 60 mtr.

Cable dia. : 3 1 2 mm.

FM Class I, DIV. 1, Group ABCD

T3B for ambient temp. ≤ 55 ϒC

T4 for ambient tem

p

. ≤ 40 ϒC

IM 12B6C3-E-E

2-12 Specification

Stamp Company : Stamp Certification Institute :

Signature : Remarks :

Model EXA PH202S-B & PH202S-D

No revision to drawing without prior

FM Approval

Title : FM Control Drawing PH202S-B & PH202S-D (Non-incendive Entity

concept)

Number : FF1-PH202S-00 Page : 10 of 10

Revision : 5.4

YOKOGAWA EUROPE B.V.

Date : 01/07/2004

〈 Sensor(s) are of a passive type to be regarded as ’simple apparatus’, devices which neither store nor

generate voltages over 1.5 V, currents over 0.1 A, power over 25 mW or energy over 20

µJ, or are FM

Approvals entity approved and meet connection requirements.

〈 Electrical data of the EXA PH202S-B & PH202S-D:

- Supply circuit: Vmax=32 V; Pi=1.2 W; Ci= 737 pF; Li= 2.6 H

- Sensor input circuit: Vt=14.4 V; It=32.3 mA; Ca=600 nF; La=36 mH

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

Unclassified Location

Classified Location

Division 2

FM Approved

Power Supply

Voc

¡Ü 32 VDC

FM Approved

Terminator

R = 90..100

C = 0..2,2 F

EXA

PH202S-B

& PH202S-D

Sensor

Connections

Max. cablelength: 60 mtr.

Cable dia.: 3 12 mm.

FM Class I, DIV. 2, Group ABCD

T3B for ambient temp.

≤ 55 ϒC

T4 for ambient tem

p

. ≤ 40 ϒC

IM 12B6C3-E-E

Specification 2-13

IM 12B6C3-E-E

3-1 Installation and wiring

3. INSTALLATION AND WIRING

3-1. Installation and dimensions

3-1-1. Installation site

The EXA converter is weatherproof and can be installed inside or outside. It should, however, be installed
as close as possible to the sensor to avoid long cable runs between sensor and converter. In any case, the
cable length should not exceed 50 meters (162 feet). Select an installation site where:

• Mechanical vibrations and shocks are negligible

• No relay/power switches are in the direct environment

• Access is possible to the cable glands (see figure 3-1)

• The 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 converter 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

Spacing panel
cut-out dimension

162 (6.4)

180 (7)

30 (1.2)

77 (3)

115 (4.5)

56 ±0.2

(2.2”)

1/2”
supply

M6 bolts (2X)

1/2”
input

min. 203

(min. 8.0)

154

(6.06)

2x ø4
(0.16)

30 (1.18)

30 (1.18)

172

(6.77)

min. 229

(min. 9.0)

Unit: mm (inch)

IM 12B6C3-E-E

Figure 3-4. Internal view of EXA wiring compartment

Figure 3-3. Wall and pipe mounting diagram

Pipe mounting
(vertical)

Wall mounting

Pipe mounting
(horizontal)

2” ND. pipe

56

(2.20)

2x ø6.5

(0.26)

4x ø10

(0.4)

70

(2.75)

115

(4.5)

92

(3.6)

200

(7.87)

Option /U: universal pipe/wall mounting kit

Installation and wiring 3-2

IM 12B6C3-E-E

3-3 Installation and wiring

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 tp protective earth.

7. The optional hose connection is used to guide the cables comming from an immersion fitting through
aprotective plastic tubing to the transmitter.

3-2-1. Cables, terminals and glands

The PH202 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

Sensor cable
gland

Power/Output
cable gland

Grounding terminal

IM 12B6C3-E-E

Figure 3-6. System configuration

3-3. Wiring of sensors

3-3-1. General precautions

Generally, transmission of signals from pH sensors is at a very low voltage and high impedance level. Thus
a lot of care must be taken to avoid interference. Before connecting sensor cables to the transmitter make
sure that next conditions are met:
– the sensor cables are not mounted in tracks together with high voltage and or power switching cables
– only standard coaxial electrode cables or extension cable are used
– the transmitter is mounted within the distance of the sensor cables (max. 10 m)
– 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

Make sure that the total of capacitances and inductances connected to the input terminals of the EXA
PH202S 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 PH202S 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 PH202S 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.

1 2

18

0

10

0

0

NO MODEYES

>

ENT

>

FAILHOLD

YES

NO

ENT

MEASURE

MAN.CAL
DISPLAY

HOLD

YOKOGAWA

MODE

TEMP

AUT.CAL

TEMP.MAN.

pH

Sensors

Recorder

Distributor

Computer

Hand Held
Communicator

Output/supply

Input

2 , 5 or 10 m

Safety Barrier
PH202S only

CURRENT OUTPUT

ref

pH/ORP temp.

Installation and wiring 3-4

IM 12B6C3-E-E

3-5 Installation and wiring

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

The EXA PH202S-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

3-3-4. Liquid earth

In all circumstances, the sensor side of the measuring loop must be grounded to the measuring liquid. The
EXA PH202S uses advanced differential high impedance input circuits. This technique calls for a grounding
to the liquid. In addition to that the sensor checking circuits also use the liquid earth for measurement of
impedance of the sensors. All Yokogawa fittings have provisions for this connection. It is usually called liquid
earth in all our manuals.
A separate connection should be made to the terminal numbered 14 in all cases to get a proper and stable
measuring loop.

3-3-5. Access to terminal and cable entry

1. To access terminals remove the front cover of the EXA PH202S by releasing the 4 captive screws.

2. Thread the sensor cables into the connection space and connect the cables to the terminals as indicated
in the wiring diagram. Make sure all connections are firm and do not touch each other.

3. Screw the gland securely and tighten it to keep out moisture. DO NOT use a
wrench to tighten the nut.

4. The optional hose connection is used to guide the cables coming from an immersion fitting through a
protective plastic tubing to the transmitter.

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.

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.

WARNING

IM 12B6C3-E-E

3-4-2. Connection of the power supply

The terminal strip is accessed as was described in §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 3-8 and 3-9.

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.

Red

ref

pH/ORP

temp.

Green

Yellow

Colour code

rd bl

rd
bl
bk
wt

=
=
=
=

red
blue
black
white

11 12 14 17 13

15 16HIGH I

MPLOW IMP

TEMP LE INPUT 2 INPUT

1

rd bl

SINGLE
ELECTRODES

CONNECTION DIAGRAM FOR SENSORS

Blue

Combi
pH/Ref

Comb

i

Orp/Re

f

temp.

Green

Colour code

COMBINED
ELECTRODES

rd

bk

11 12 14 17 13

15 16HIGH I

MPLOW IMP

TEMP LE INPUT 2 INPUT

1

wtbl

bl

rd

bk

bl rd

rd
bl
bk
wt

=
=
=
=

red
blue
black
white

12B6C3-06

CONNECTION DIAGRAM FOR SENSOR

link

link

Fig. 3-7. Connection diagrams

ORP/Ref

Installation and wiring 3-6

IM 12B6C3-E-E

3-7 Installation and wiring

3-5. Wiring the sensor system

3-5-1. Impedance measurement jumper settings

NOTE:
It is important to decide first which application and which settings are appropriate for the installation. This
decision is best made before the jumpers are installed, because the cables will rest beside the jumpers in
their installed positions.

Table 3-1. Impedance measuring jumpers

Figure no. Jumper Settings Jumper Settings Application & Sensor Connections

Input #1 Input #2

1 High Impedance Low Impedance Normal pH sensors
Glass sensor on Input #1
Reference sensor on Input #2

2 High Impedance High Impedance Special electrodes using
2 glass sensors
(e.g. Pfaudler 18)

3 Low Impedance High Impedance ORP (pH compensated) and/or rH
metal sensor on Input #1
pH glass (as reference) on Input #2

4 Low Impedance Low Impedance ORP (Redox measurement)
metal sensor on Input #1
Normal reference on Input #2

For convenience insulated jumper links are provided. Ordinary wire links can also be used, and are just as
effective.

The following four jumper figure illustrations (figure 3-8) show the jumper positions related to the figure
numbers in the above table.

11 12 14 17 13 15 16

HIGH IMPLOW IMP

HART SUPPLY TEMP LE

INPUT 2

INPUT 1

11 12 14 17 13 15 16

HIGH IMP

LOW IMP

HART SUPPLY TEMP LE INPUT 2 INPUT 1

11 12 14 17 13 15 16

HIGH IMP

LOW IMP

HART SUPPLY TEMP LE

INPUT 2

INPUT

1

11 12 14 17 13 15 16

HIGH IMP

LOW IMP

HART SUPPLY TEMP LE

INPUT 2 INPUT 1

1

2

3

4

Fig. 3-8. Jumper positions

IM 12B6C3-E-E

Figure 3-9. Terminal identification labels

3-6. Sensor wiring

Refer to figure 3-10, which includes drawings that outline sensor wiring.

The EXA analyzers can be used with a wide range of commercially available sensor types, both from
Yokogawa and other manufacturers. The sensor systems from Yokogawa fall into two categories; the ones
that use a fixed cable and the ones with separate cables.

To connect sensors with fixed cables, simply match the terminal numbers in the instrument with the
identification numbers in the instrument on the cable ends.

The separate sensors and cables are not numbered, but instead use a color-coding system. The electrodes
have a colored band incorporated in the label on the connection cap:

• Red for measuring electrodes (both pH and ORP)

• Yellow for reference electrodes

• Blue for combined sensors with both measuring and reference elements in the same body

• Green for temperature sensors

The recommended procedure is to color-code each end of the cables to match the sensors with the color
strips provided with each cable. This provides a quick way to identify the ends of the cables belonging to
a particular sensor when they are installed. (The procedure for fixing the identification labels is described in
detail in the instruction sheet provided with the cable.)

11 12 14 17 13 15 16

HIGH IMPLOW IMP

HART SUPPLY TEMP LE INPUT 2 INPUT 1

Installation and wiring 3-8