YOKOGAWA PH402G User's Manual

YOKOGAWA

Instruction
Manual

Model PH402G
pH Converter

IM 12B6B3-E-E

8th Edition

TABLE OF CONTENTS

PREFACE

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

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

1

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

2. PH402 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1

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

2

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

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

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

3-3. Wiring the power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4

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

3-3-2. Access to terminal and cable entry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4

3-3-3. AC power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5

3-3-4. DC power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5

3-3-5. Grounding the housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5

3-3-6. Switching on the instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-5

3-4. Wiring the contact signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6

3-4-1. General precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6

3-4-2. Contact outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6

3-5. Wiring the analog output signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6

3-5-1. General precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6

3-5-2. Analog output signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-6

3-6. Wiring the sensor system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-7

3-6-1. Impedance measurement jumper settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-7

3-7. Sensor wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-10

3-7-1. Connection cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-11

3-7-2. Sensor cable connection with special grommet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-12

3-13

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

. . . .

3-8. Tag plate mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-15

4.

OPERA

TION; DISPLA

Y 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

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

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-4

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2

5-1-1. Manual temperatur

e selection and adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-3

5-1-2. Process temperature measuring in ORP mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-4

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

5-1-4. Manual wash start/stop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-5

IM 12B6B3-E-E

5-1-5. Setpoint adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-6

5-1-6. Manual impedance check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-7

5-2. Commissioning mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-8

-2-1. Setpoints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-9

5

5-2-2. Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-11

5-2-3. Hold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-13

5-2-4. Wash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-15

-2-5. Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-16

5

-3. Notes for guidance in the use of service coded settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-17

5

5-3-1. Parameter specific functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-18

5-3-2. Temperature compensation and measuring functions . . . . . . . . . . . . . . . . . . . . . . . . . .5-20

5-3-3. Calibration functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-22

5-3-4. mA Output functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-24

5-3-5. Contact outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-26

5-3-6. User interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-30

5-3-7. Communication setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-32

5-3-8. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-32

5-3-9. Test and setup mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-34

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 PH402 converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .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. SPARE PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-1

10. APPENDIX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-1

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

10-2. Configuration checklist for PH402G . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-3

10-3. Setup for sensor compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-4

10-3-1. General

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

10-4

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

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

10-4. Setup 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. Softwar

GLOSSAR

e histor

Y

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

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

y

10-6

10-7

ERROR CODES
QUALITY INSPECTION STANDARD & CERTIFICATE

IM 12B6B3-E-E

CAUTION

PREFACE

WARNING

Electric discharge

The EXA analyzer contains devices that can be damaged by electrostatic discharge. When servicing this
equipment, please observe proper procedures to prevent such damage. Replacement components should
be shipped in conductive packaging. Repair work should be done at grounded workstations using

rounded soldering irons and wrist straps to avoid electrostatic discharge.

g

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 Instr

ument 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 instr

ument 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:

l Improper operation by the user.
l Use of the instrument in improper applications
l Use of the instrument in an improper environment or improper utility program
l 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 fr

om the date of shipment from the manufactur

er.

Individual sales organisations can deviate from the typical warranty period, and the conditions of sale

elating to the original purchase order should be consulted. Damage caused by wear and tear, inadequate

r
maintenance, cor

osion, or by the ef

r

fects of chemical pr

ocesses ar

e excluded fr

om this war

ranty coverage.

In the event of warranty claim, the defective goods should be sent (freight paid) to the service department of

elevant sales or

the r

ganisation for r

epair or r

eplacement (at Y

okogawa discr

etion). The following information

must be included in the letter accompanying the returned goods:

l Part number
l Original pur
l Length of time in service and a description of the process
l Description of the fault, and the cir

ocess/envir

l Pr
l A statement whether warranty or non-warranty service is requested
l Complete shipping and billing instructions for return of material, plus the name and phone number of a

contact person who can be r

ned goods that have been in contact with process fluids must be decontaminated/disinfected before

Retur
shipment. Goods should car

, model code and serial number

chase or

der and date

cumstances of failur

onmental conditions that may be r

eached for further information.

tificate to this ef

y a cer

r

e

elated to the installation failur

e of the device

fect, 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 12B6B3-E-E

Introduction 1-1

MODEL
SERIAL NO.
SUPPLY

PH402G-E-1-E
FD 020 034
110-120 VAC, 50/60 Hz, 10 VA

N200

1. INTRODUCTION AND GENERAL DESCRIPTION

The Yokogawa EXA 402 is a 4-wire transmitter designed for industrial process monitoring, measurement
and control applications. This instruction manual contains the information needed to install, set up, operate
and maintain the unit correctly. This manual also includes a basic troubleshooting guide to answer typical
user questions.

Yokogawa can not be responsible for the performance of the 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 nameplate affixed to the top of the display board of the instrument
agrees with your order.

NOTE:
The nameplate will also contain the serial number and power supply selection.
Be sure to apply correct power to the unit.

Figure 1-1. Nameplate

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: Converter EXA 402

Instruction Manual (See model code for language)
Packet with special cable gr

ommet and blanking pieces
Packet with 4 screws for mounting on a panel (M6x8mm)
Optional mounting hardware when specified (See model code)

IM 12B6B3-E-E

1-2 Introduction

1-2. Application

he EXA converter is intended to be used for continuous on-line measurement in industrial installations. The

T
unit combines simple operation and microprocessor-based performance with advanced self-diagnostics and
enhanced communications capability to meet the most advanced requirements. The measurement can be
used as part of an automated process control system. It can also be used to indicate dangerous limits of a
process, to monitor product quality, or to function as a simple controller for a dosing/neutralisation system.

Yokogawa designed the EXA analyzer to withstand harsh environments. The 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 par

ticular 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 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 instruction 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 instruction 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 and low voltage safety directive IEC1010 without

mance in even the most demanding industrial

omise, to assur

compr

e the user of continued accurate per

for

installations.

IM 12B6B3-E-E

Specification 2-1

2. PH402 SPECIFICATIONS

-1. General

2
A. Input specifications

: Dual high impedance inputs

(2 x 1013Ω) with provision for
liquid earth connection.

uitable for inputs from glass

S
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 to 140 ºC
(-20 -to 300 ºF)
(for 8k55 sensor -10 to
120 ºC (10 to 250 ºF);

for 10kPTC sensor -20 to

140 ºC (0 to 300 ºF))

C. Span

- pH : min 1 max 20 pH

- ORP : min 100 max 2000 mV

- rH : min 2 max 55 rH

- Temperature : min 25 ºC max 200 0C
min 50 ºF max 400 0F
(for 8k55 sensor max 100 ºC
(250 ºF))

D. Transmission Signals

: Two isolated outputs of 0/4-

20 mA DC with common
negative.
Maximum load 600 Ω.
Auxiliary output can be
chosen from pH, temperature,
ORP or rH (with suitable
sensor), P.I. control. burn up
(22 mA) or burn down
(0/3.5 mA) to signal failure.

E. Temperature compensation

- Range : Automatic or manual
compensation to Nernst
equation.
Process compensation by
configurable temperature
coefficient.
Adjustable ITP (Isothermal
point of intersection).

F. Calibration : Semi-automatic using

preconfigured NIST buffer
tables 4, 7 & 9, or with user

defined buffer tables, with
automatic stability check.

anual adjustment to grab

M
sample.
Slope and Asymmetry
Potential setting.
Zero point can be selected for

alibration and display instead

c
of As. Pot. (IEC746-2)

G. Serial Communication

: Bi-directional according to the

EIA-485 standard using HART
protocol and PC402 software.

H. Logbook : Software record of important

events and diagnostic data.
Available through RS485, with
key diagnostic information
available in the display.

I. Display : Custom liquid crystal display,

1

2

with a main display of 3

/
digits 12.5 mm high. Message
display of 6 alphanumeric
characters, 7 mm high.
Warning flags and units (pH
and mV) as appropriate.

J. Contact outputs

- General : Four (4) SPDT relay contacts
with LED indicators. For S1,
S2, and S3, the LED is on
when relay is powered.
NOTE: For S4 (FAIL) LED

lights when power is

removed (Fail safe).
Contact outputs configurable
for hysteresis and delay time.

- Switch capacity : Maximum values 100 VA,
250 VAC, 5 Amps.
Maximum values 50 Watts,
250 VDC, 5 Amps.

- Status : High/Low process alarms,
selected from pH, ORP, rH
and temperature.
Contact output is also
available to signal “Hold
Active”

- Control function : On / Off

PI pulsed Proportional duty cycle

control with integral term.

PI frequency Proportional frequency control

with integral term. In addition
wash cleaning control signal on
S3, and FAIL alarm for system
and diagnostic errors on S4

IM 12B6B3-E-E

2-2 Specifications

K. Contact input : Remote wash cycle start.

L. Power supply : 230 VAC ±15%, 50/60 Hz.

Max. consumption 10 VA.
115 VAC ±15%, 50/60 Hz.
Max. consumption 10 VA.

00 VAC ± 15% 50/60 Hz.

1
Max. consumption 10 VA.
24 VDC -20% / +30%
Max. consumption 10 Watts.

M. Input isolation : 1000 VDC

N. 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 : 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

Ω, 3 kΩ Balco, 5 k1Ω and
10k PTC

- Linearity : ≤0.2 oC ± 0.02 mA

- Repeatability : ≤0.1 oC ± 0.02 mA

- Accuracy : ≤0.3 oC ± 0.02mA

Performance : Temperature with Pt100 Ω

& 8k55

Ω

- Linearity : ≤0.3 oC ± 0.02 mA

- Repeatability : ≤0.1 oC ± 0.02 mA

- Accuracy

: ≤0.4

± 0.02 mA

C

o

B. Ambient operating temperature

-30 to +70

:

o

C (-20 to 160 ºF)

for mA output.

-10 to +70 oC (10 to 160 ºF)
for LCD

C. Storage temperature

: -30 to +70 oC (-20 to 160 ºF)

D. Humidity : 10 to 90% RH non-

condensing

E. Housing

Case : Cast aluminium with

chemically resistant coating

Cover : flexible polycarbonate window.

ase color : off-white and

C
Cover color : moss green.
Cable entry : via six 1/2” polyamide glands.
Cable terminals : are provided for up to 2.5

mm2finished wires.

rotection : weather resistant to IP65 and

P

NEMA 4X standards.

Mounting : Pipe wall or panel, using

optional hardware.

F. Data protection : EEPROM for configuration and

logbook, and lithium battery
for clock.

G. Watchdog timer: Checks microprocessor

H. Automatic safeguard

: Return to measuring mode

when no keystroke is made
for 10 min.

I. Power interruption

: Less than 50 milliseconds no

effect. More than 50
milliseconds reset to
measurement.

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 50082-2

- Low voltage : meets council directive
73/23/EEC

- Installation

: Designed for installation

conforming to IEC 1010-1.
Category II.

2-3. Model and suffix codes

Model Suffix Option Description

PH402G .................................... pH/ORP transmitter

Supply -1 ........................... 115 Volts 50/60 Hz

voltage

Instr

Options /U......... Pipe and wall mounting

* For other languages contact local sales of

-E ................................ Always E

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

-2

-4........................... 24 Volts DC

-5

uction manual -E

........................... 100 Volts 50/60 Hz

code

olts 50/60 Hz

230 V

.................... English language *

e

dwar

/PM...... Panel mounting hardware

/Q
/SCT

har

........ Quality certificate

Stainless steel tag

....

fice

IM 12B6B3-E-E

Installation and wiring 3-1

min.185 (7.25)

min.195 (7.75)

1

3

8 (5.

43)

138

M6

M6

M5

cut - out = 138 x 138 (5.43 x 5.43)

3. INSTALLATION AND WIRING

3-1. Installation and dimensions

-1-1. Installation site

3

The EXA converter is weatherproof and can be installed inside or outside. It should, however, be installed as

lose as possible to the sensor to avoid long cable runs between sensor and converter. In any case, the

c
cable length should not exceed 50 meters (162 feet). Select an installation site where:

l Mechanical vibrations and shocks are negligible
l No relay/power switches are in the direct environment
l Access is possible to the cable glands (see figure 3-1)
l The transmitter is not mounted in direct sunlight or severe weather conditions
l 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:

l Panel mounting using optional brackets
l Surface mounting on a plate (using bolts from the back)
l Wall mounting on a bracket (for example, on a solid wall)
l Pipe mounting using a bracket on a horizontal or vertical pipe (maximum pipe diameter 50 mm)

144(5.67)

24(1)

16.5

(0.65)

115.5(4.55)

Figure 3-1. Housing dimensions and layout of

glands

144(5.67)

Figure 3-2. Panel mounting diagram

IM 12B6B3-E-E

3-2 Installation and wiring

wall mounting pipe mounting

80

(3.15)

2x ø6.5

(0.26)

200

(7.87)

70

(2.75)

4x ø10
(0.4)

145

(5.70)

Figure 3-3. Wall and pipe mounting diagram

pipe mounting
(vertical)

(horizontal)

2” ND. pipe

OPTION/U: Universal pipe/wall mounting kit

e 3-4. Internal view of EXA wiring compartment

Figur

IM 12B6B3-E-E

Installation and wiring 3-3

12D7C3-04

GLANDS TO BE

USED FOR CABLING

3-2. Preparation

efer to figure 3-4. The relay contact terminals and power supply connections are under the screening

R
(shielding) plate. These should be connected first. Connect the sensor, outputs and data communication
connections last.

To open the EXA 402 for wiring:

. Loosen the four frontplate screws and remove the cover.

1

2. Use the rubber knob in the lower righthand corner and swing open the display board to the left.

3. The upper terminal strip is now visible.

4. Remove the screen (shield) plate covering the lower terminal strip.

5. Connect the power supply and contact outputs. Use the three glands at the back for these cables.

6. Replace the screen (shield) plate over the lower terminals.

WARNING

Always replace the screen plate over the power and contact outputs for safety and avoid
interference.

7. Connect the analog output(s), the sensor input, and, if necessary, the RS485 serial bus.

8. Use the front three glands for analog output, sensor input, contact input and communication cabling
(see figur

e 3-5).

9. Close the display board and switch on the power. Commission the instrument as required or use the
default settings.
Replace the cover and secure frontplate with the four screws.

10.

High voltage section

Contact

(S3,S4,FAIL)

output
cables

Sensor

cables

Contact

(S1,S2)

output
cables

Analog
output
cables

Power

cable

Communi-

cation,

contact

input

Suitable for cables with an outside diameter between 7 - 12 mm (9/32-15/32in.)

Figure 3-5. Glands to be used for cabling

IM 12B6B3-E-E

3-4 Installation and wiring

S1

S2

S4/FAIL

S3/WASH

SYSTEM CONFIGURATION

1

SYSTEM CONFIGURATION

FRONT GLANDS

0/4-20 mA

0/4-20 mA

Figure 3-6. System configuration

Sensor

Output
signals

RS485

Contact input

REAR GLANDS

Power

Contact
output

ontact

C
output

3-3. Wiring the power supply

3-3-1. General pr

ecautions

Make sure the power supply is switched off. Also, make sure that the power supply is correct for the
specifications of the EXA and that the supply agrees with the voltage specified on the nameplate. Remove
the front cover by unscrewing the four screws to check this nameplate on the top of the display board.

Local health and safety r
protected internally by a fuse. The fuse rating is dependent on the supply to the instrument. The 250 VAC
fuses should be of the “time-lag” type, conforming to IEC127.

Fuse ratings are 230 VAC - 50 mA; 100 VAC - 100 mA; 115 VAC - 100 mA; 24 VDC - 1.0 A.

The inter

nal fuse is located next to the power ter

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

Terminals 1, 2 and 3 on the bottom terminal strip are used for the power supply. Guide the power cables
through the gland closest to the power supply terminals. The terminals will accept wires of 2.5 mm2(14
AWG). Use cable finishings if possible.

Connect the wires as indicated in the wiring diagram (refer to figure 3-6).

egulations may r

e an external circuit breaker to be installed. The instrument is

equir

minals (in the lower righthand corner).

IM 12B6B3-E-E

Installation and wiring 3-5

1

41317

1

1

1

2 22 21 63 66 65 62 61 95 94 93 9291

SCREEN

mA2

mA1

SCREEN

TL TL

161

5

7

1

S4

S3

S2

S1

C NC N

O

7

2 73 51 52 53 41 43 31 334232

250V AC

5A

100V A

2

50VDC

5A

50W

F

USE

1

00

115

2

30

24

250VAC; T

3

12

C NC NO C NC NO C NC NO

V

AC

VAC

V

AC

VDC

100 mA

100 mA

50 mA

1 A

S

ensor Inputs

Contact
Input

m

A Outputs

Digital
Communications

Relay Contacts

P

ower Supply

p

H/ORP

ref.

l

iquid

earth

t

emp.

sens.

High voltage compartment

S

ENSOR(S) CONT mA OUTPUT RS485

Figure 3-7. Input and output connections

3-3-3. AC power

Connect terminal 1 to the phase line of the AC power and terminal 2 to the zero line. Terminal 3 is for the
power ground. This is separated from input ground by a galvanic isolation.

3-3-4. DC power

Connect terminal 1 to the positive outlet and terminal 2 to the negative outlet. Terminal 3 is for the power
ground. This is separated from input ground by a galvanic isolation. A 2-core screened cable should be
used with the screen connected to terminal 3. The size of conductors should be at least 1.25 mm2. The
overall cable diameter should be between 7 & 12 mm.

3-3-5. Grounding the housing

ea

otect the instrument against inter

o pr

T

ence, the housing should be connected to gr

fer

ound by a lar

ge ar

conductor. This cable can be fixed to the rear of the housing using a braided wire cable. See figure 3-8.

3-3-6. Switching on the instrument

After all connections ar

e made and checked, the
power can be switched on from the power supply.
Make sure the LCD display comes on. All segments
will illuminate, then the instr

ument will momentarily
display its unique serial number. After a brief interval,
the display will change to the measured value. If

e displayed or a valid measured value is not

ors ar

r

er
shown, consult the troubleshooting section (Chapter

8) before calling Yokogawa.

Figure 3-8. Grounding the housing

IM 12B6B3-E-E

3-6 Installation and wiring

3-4. Wiring the contact signals

3-4-1. General precautions

The contact output signals consist of voltage-free relay contacts for switching electrical appliances (SPDT).
They can also be used as digital outputs to signal processing equipment (such as a controller or PLC). It is
possible to use multi-core cables for the contact in and output signals and shielded multi-core cable for the

nalog signals.

a

3-4-2. Contact outputs

The EXA unit’s four contact outputs can be wired to suit your own custom requirements (Figure 3-6).

In the Non-Alarm or Power Off states, contacts S1, S2 and S3 are OFF, Common (C) and Normally Closed
(NC) are in contact.

In the “Fail” or Power Off states, contact S4 is ON, Common (C) and Normally Closed (NC) are in contact.

You can either use them to switch AC power, or switch a DC Voltage for digital interfacing.
Default settings

l The contact S1 is pre-programmed for high alarm function.
l The contact S2 is pre-programmed for a low alarm function.
l The contact S3 is not activated as an alarm (off).
l The contact S4 is pre-programmed for FAIL.

The three control contacts (S1 to S3) can be used for simple process control by programming their function
(Chapter 5). The FAIL contact is programmed to signal a fault in the measuring loop. Always connect the
FAIL contact to an alarm device such as a warning light, sound annunciator, or alarm panel to make full use
of the fault detection possibilities (self diagnostics) of the EXA converter.

3-5. Wiring the analog output signals

3-5-1. General precautions

The analog output signals of the EXA transmit low power standard industry signals to peripherals like control
systems or strip-chart recorders (Figure 3-6).

3-5-2. Analog output signals

The output signals consist of active current signals of either 0-20 mA or 4-20 mA. The maximum load can
be 600 ohms on each.

It is necessary to use screening/shielding on the output signal cables. Terminal 63 is used to connect the
shielding.

IM 12B6B3-E-E

Installation and wiring 3-7

3-6. Wiring the sensor system

3-6-1. 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 done before the jumpers are installed, because the cables will rest on top of the jumpers in
their installed positions.

able 3-1. Impedance measuring jumpers

T

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

The following four jumper figure illustrations (figure 3-9) show the jumper positions related to the figure
numbers in the above table.

IM 12B6B3-E-E

3-8 Installation wiring

2

1

1

2D8B2-02

J

UMPERS 1&2

Default jumper connections for :

- Input 1, High impedance

- Input 2, Low impedance
Service code 03 = 1.1.1

- Input 1, High impedance, Temp. comp., Check on
Service code 04 = 0.0.1

- Input 2, Low impedance, Temp. comp. off, Check on

Jumper connections for :

- Input 1, High impedance

- Input 2, High impedance
Service code 03 = 1.0.1

- Input 1, High impedance, Temp. comp. off, Check on
vice code 04 = 1.0.1

Figure 3-9a. Impedance measurement jumper setting

IM 12B6B3-E-E

Ser

- Input 2, Low impedance, T

emp. comp. of

f, Check on

Installation and wiring 3-9

4

3

Jumper connections for :

- Input 1, Low impedance

- Input 2, High impedance
Service code 03 = 0.0.1

- Input 1, Low impedance, Temp. comp. off, Check on
Service code 04 = 1.1.1

- Input 2, High impedance, Temp. comp. on, Check on

Jumper connections for :

- Input 1, Low impedance

- Input 2, Low impedance
vice code 03 = 0.0.1

Ser

- Input 1, Low impedance, Temp. comp. off, Check on

Figure 3-9b. Impedance measurement jumper setting

Service code 04 = 0.0.1

- Input 2, Low impedance, T

emp. comp. of

f, Check on

IM 12B6B3-E-E

3-10 Installation and wiring

71

S4

S3

S2

S1

C NC NO

72 73 51 52 53 41 43 31 334232

250V AC

5A

100V A

250VDC

5A

50W

100

115

230

24

250VAC; T

312

C NC NO C NC NO C NC NO

VAC

VAC

VAC

V

DC

100 mA

100 mA

50 mA

1 A

SCREEN

mA2

mA1 TL

RS485

15 16 17 13

1

4

12

11 22 21 63 66 65

6

2

61

9

5

94 93 92 91

SCREEN

TL

INPUT 1
L

OW IMP

INPUT 2
L

OW IMP

I

NPUT 2
H

IGH IMP

INPUT 1
H

IGH IMP

Sensor inputs

Sensor(s)

Contact
input

Cont

mA
outputs

mA output

Relay contacts Power supply

e 3-10. Terminal identification labels

Figur

3-7. Sensor wiring

Refer to figure 3-11, which includes drawings that outline sensor wiring.

Digital
communications

Fuse

The EXA PH402 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:

l Red for measuring electrodes (both pH and ORP)
l Yellow for reference electrodes
l Blue for combined sensors with both measuring and reference elements in the same body
l 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.)

IM 12B6B3-E-E

Installation and wiring 3-11

*

*

*

*

1

2B6B3-03/1

12B6B3-03/3

*

*

*

12B6B3-03/2

3-7-1. Connection cable

here are two types of connection cable, one for single sensors and one for combined sensors. The former

T
is a coaxial cable and has only two connections.

l Red to measuring element
l Blue to screen (shield)

he latter is a triaxial cable with three connections, (it has an extra white wire termination) these wires are

T
connected:

l Red to measuring element
l Blue to reference
l White to screen (shield)

To connect the other sensor systems, follow the general pattern of the terminal connections as listed below:
11 & 12 Temperature compensation resistor input (Pt100, Pt1000, 3k, 5k1, 8k55 and 10k PTC )
13 Input no. 2 (normally the reference element)
17 Screen (shield) for input no. 2
14 Liquid earth (solution ground) connection
15 Input no. 1 (normally the measuring element)
16

Screen (shield) for input no. 1

Green

Yellow

Red

Red

Blue

Red

Black

Red
Blue
Blue

Cable markers

pH transmitter

11 Temperature
12 Temperature
13 Reference
14 Solution ground
15 Glass (measure)
16 Shield
17 Shield

FU20/FU25 4-in one sensor

11 Temperature
12 Temperature
13 Reference
14 Solution ground
15 Glass (measure)
16 Shield
17

Note: Connect cables to similarly marked

terminals: 11 to 11, 12 to 12, etc.

een

Gr

Blue

Red

Blue
Blue
Black

Red

White

11 Temperature
12 T
13 Reference
14 Solution gr
15 Glass (measure)
16 Shield
17 Shield

emperature

ound

11 Temperature
12 Temperature

ence

13 Refer
14 Solution ground
15 Glass (measur
16 Shield
17 Shield

e)

Cable markers

Combined pH/r

ef sensors

Figure 3-11a. Sensor wiring

Retractable sensor assembly PR20

(Also PD20, PF20 & PS20)

NOTE:
Connect cables to similarly marked ter
to 11, 12 to 12, etc.

minals: 11

IM 12B6B3-E-E

3-12 Installation and wiring

11 TEMPERATURE

1

2 TEMPERATURE

13 REFERENCE

14 SOLUTION GROUND (ORP)

15 pH

16 SHIELD

17

"All in one" pH & ORP (or rH)

Service code 01 set to pH
Service code 02 set to ORP (or rH)

S

eparate sensors ORP

Temp. sensors optional for indication
o

nly, not for compensation

Service code 01 set to ORP

*

Cable Markers

R

ED

BLUE

RED

B

LACK

RED

BLUE

BLUE

Red

*

Yellow

*

Green

*

11 TEMPERATURE

1

2 TEMPERATURE

1

3 REFERENCE

1

4 SOLUTION GROUND

15 GLASS (MEASURE)

16 SHIELD

17 SHIELD

11 TEMPERATURE

1

2 TEMPERATURE

13 REFERENCE

1

4 SOLUTION GROUND

15 GLASS (MEASURE)

1

6 SHIELD

17 SHIELD

Separate sensors ORP/ref sensor

Temp. sensors optional for indication
only, not for compensation
Service code 01 set to ORP

*

C

able Markers

R

ED

BLUE

BLUE

B

LACK

R

ED

W

HITE

Blue

*

G

reen

*

Separate sensors pH & ORP (or rH)

Temp. sensors optional for indication
only, not for compensation
Service code 01 set to pH
Service code 02 set to ORP (or rH)

*

Cable Markers

RED

BLUE

R

ED

BLACK

R

ED

B

LUE

B

LUE

R

ed

*

Yellow

*

Green

*

1

1 TEMPERATURE

1

2 TEMPERATURE

1

3 REFERENCE

14 METAL ORP SENSOR

15 GLASS (MEASURE)

16 SHIELD

17 SHIELD

1

1 TEMPERATURE

12 TEMPERATURE

13 REFERENCE

14 SOLUTION GROUND

1

5 GLASS (MEASURE)

16 SHIELD

17 SHIELD

Combined pH/ORP sensor

Temp. sensors optional for indication
only, not for compensation
Service code 01 set to ORP

*

Cable Markers

R

ED

BLUE

BLUE

BLACK

RED

WHITE

B

lue

*

Green

*

"All in one" ORP

Service code 01 set to ORP
Service code 03 set to off
Service code 04 set to off

11 TEMPERATURE

1

2 TEMPERATURE

13 REFERENCE

14 SOLUTION GROUND (ORP)

15 pH

16 SHIELD

17

11

12

1

3

14

16

15

>

Connections normal pH

A-15
B-13
C­D-14
E-11
F-12
S-3 or 63

pH

ref

LE

temp

>

Conn ecti ons differen tial pH

A-15
B-14
C-13
D-17
E-11
F-12
S-3 or 63

pH

pH ref

LE

temp

Figure 3-11b. Sensor wiring

IM 12B6B3-E-E

17 Overall Screen

11

12

12

13

14

14

16

15

13

14141615

17

11

17

11 Red

12 Blue

15 Core 16 Screen
White Co-axial cable

13 Core 14 Screen
Brown Co-axial Cable

14 (screen)

17 (overall screen)

12 (blue)

11 (red)

13 (core)

16 (screen)

15 (core)

Co-axial cable

(white)

Co-axial cable

(brown)

WF10 Cable

EXA pH TRANSMITTER / CONVERTER

11

12

13

14

15

16

17

11

12

13

17

15

16

14

Note that cables 14 & 17 connect to
terminals 17 & 14 respectively.

Installation and wiring 3-13

3-7-2. Sensor cable connection with special grommet

In order to seal multiple sensor cables into EXA PH402, a special grommet is provided that is designed to
accommodate one, two or three sensor cables (5 mm dia.) plus a liquid earth cable (2.5 mm dia.). In the

ack with the grommet are blanking pieces to close any unused holes. When correctly assembled, the

p
grommet maintains the IP65 (NEMA 4X) rating of the EXA PH402 housing.

Refer to figure 3-12 to assemble the grommet connections:

1. First remove the nut and standard rubber seal from the selected gland
. Discard the seal. This will be replaced later by the special grommet

2

3. Thread the cables through the nut and the gland

4. Connect the cables to their designated terminals

5. Arrange the cables to avoid tangles and insert the grommet between the gland and the nut

6. The grommet is split to permit the cables to be mounted after connection.

(This also ensures even length adjustment.)

7. Ensure that any unused holes are filled with the blanking pieces

8. Tighten the nut to form a firm seal. (Hand-tight is sufficient.)

Note: The special gland is intended to be used to seal the multiple cables from the Yokogawa flow fittings

such as FF20 and FP20. The designated cables are WU20 sensor cables, which are approximately
5 mm (0.2 “) in diameter, and 82895002 liquid earth cables, which are approximately 2.5 mm (0.1 “)
in diameter.

For sensor systems using a single cable, like the FU20 (FU25) and the PR20, PD20, PF20 and PS20, the
standard gland will accommodate the cable adequately. Single cables between approximately 7 mm and 12
mm (0.28 “ and 0.47 “) can be sealed properly with these glands.

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

Where a convenient installation is not possible using the standard cables between sensors and converter, a
junction box and extension cable may be used. The Yokogawa BA10 junction box and the WF10 extension
cable should be used. These items are manufactured to a very high standard and are necessary to ensure
that the specifications of the system can be met. The total cable length should not exceed 50 metres
(e.g. 5 m fixed cable and 45 m extension cable). In the case of systems using dual high impedance sensors
(e.g. Pfaudler 18), then the cable length is restricted to 20 metres (fixed cable only, no extension with F10).

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

IM 12B6B3-E-E

3 cm

heat shrink

9

cm

remove insulation

3 cm

cotton threads

11
12

17

15

16
13

14

3-14 Installation and wiring

Extension cable may be purchased in bulk quantities or in pre-finished lengths. In the case of bulk quantities

ut to length, then it is necessary to terminate the cable as shown below.

c

Termination procedure for WF10 cable.

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

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

Fig. 3-13a.

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

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

Fig. 3-13b.

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

6. Insulate the overall screen and the 2 coaxial screens with suitable plastic tubing.

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

Fig. 3-13.c

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

IM 12B6B3-E-E

Installation and wiring 3-15

Figure 3-14. Sensor cable connections with special grommet

3-8. Tag plate mounting

When option /SCT is specified, a stainless steel tagplate is supplied with the designated Tag No. stamped
or engraved. It is mounted as shown in figure 3-14 using one of the cable glands.

IM 12B6B3-E-E

IM 12B6B3-E-E

Operation 4-1

4. OPERATION; DISPLAY FUNCTIONS AND SETTING

4-1. Operator interface

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

LEVEL 1: Maintenance

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

LEVEL 2: Commissioning

A second menu is exposed when the EXA front cover is removed and the display board is revealed. Users
gain access to this menu by pressing the button marked *in the lower right of the display board. This menu
is used to set such values as the output ranges and hold and wash features. It also gives access to the
service menu. (See table 4-1).

LEVEL 3: Service

For more advanced configuration selections, press the button marked *, then press “NO” repeatedly until
you reach SERVICE. Now push the “YES” button. Selecting and entering “Service Code” numbers in the
commissioning menu provide access to the more advanced functions. An explanation of the Service Codes
is listed in chapter 5 and an overview table is shown in chapter 10.

Table 4-1. Operations overview

Routine Function Chapter

Maintenance AUT CAL Calibration with programmed buffer solutions 6

MAN CAL Calibration with other buffer solutions 6

SAMPLE Grab sample calibration 6

DISPLAY Read auxiliary data or set message display 4

SETPOINTS Adjust alarm setpoints (when activated) 5

WASH Manual wash start (when activated) 5

MAN.IMP Manual start of impedance check 5

TEMPERATURE Select automatic or manual compensation 5

HOLD Switch hold on/off (when activated) 5

Commissioning SETPOINTS Adjust alarm setpoints 5

RANGE Adjust the output range 5

SET HOLD Activate the hold function 5

WASH Activate and configure the wash timer 5

Service SERVICE Fine tune the specialized functions of the 5

(Access to coded entries converter

from the commissioning

level)

NOTE:
All three levels may be separately protected by a password. See Service Code 52 in chapter 5 Service
Code table for details on setting passwords.

IM 12B6B3-E-E

4-2 Operation

HOLD FAIL

YES NO

ENT

SETPOINTS
RANGE
SET HOLD

SERVIC

E

*

MEASURE

MAN.CAL
DISPLAY

HOLD

NO MODEYES

ENT

YOKOGAWA

M

ODE

TEMPERATURE

AUT.CAL

WASH

TEMP.MAN.

pH

mV

C

ONTACTS

S

1

S2

WASH/S3

FAIL/S4

Output hold flag

Units

Main display

Message display

Key prompt flags

Selection keys
YES : Accept setting
NO : Change setting

Adjustment keys
> : Choose digit to

adjust
^ : Adjust digit
ENT : Confirm change

Manual temperature
compensation flag

Figure 4-1. PH402 operator interface

Fail flag

Broken line indicates area
that can be seen through
front cover

Menu pointer flags

ommissioning

C
function menu

Commissioning

ode access key

m

Relay contact
status indicators

Measure/Maintenance
mode key

4-2. Explanation of operating keys
MODE key

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

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

YES/NO keys These ar

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

DA

T

A ENTRY keys ( )

is used as a “cursor” key. Each press on this key moves the cursor or flashing digit
one place to the right. This is used to select the digit to be changed when entering
numerical data.
is used to change the value of a selected digit. Each pr
value by one unit.The value can not be decr
incr

key This is the commissioning mode key

*

IM 12B6B3-E-E

When the r
data entr
the ENT key is pressed.

menu. This can only be done with the cover r
been used to initiate the commissioning menu, follow the pr
as described above.

AUTO CAL
MAN CAL
DISPLAY
SETPOINT
WASH
MAN.IMP
TEMPERA

TURE

HOLD

e used to select choices fr

ease past nine to zer

o, then incr

equired value has been set using the > & ^ keys, press ENT to confirm the

. Please note that the EXA 402 does not r

y

om the menu.

ess on this key increases the

eased, so in order to obtain a lower value,

ease to the r

equir

ed number

.

egister any change of data until

. It is used to obtain access to the commissioning

emoved or opened. Once this button has

ompts and use the other keys

Operation 4-3

4-3. Setting passcodes

4-3-1. Passcode protection

In Service Code 52, EXA users can set passcode protection for each one of the three operating levels, or
for any one or two of the three levels. This procedure should be completed after the initial commissioning
(setup) of the instrument. The passcodes should then be recorded safely for future reference.

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

Maintenance

Press MODE key. The display shows 000 and *PASS*
Enter a 3-digit passcode as set in Service Code 52 to obtain access to the Maintenance Mode

Commissioning

Press *key. The display shows 000 and *PASS*
Enter a 3-digit passcode as set in Service Code 52 to obtain access to the Commissioning Mode.

Service

From the commissioning menu, select *Service by pressing YES key. The display shows 000 and *PASS*
Enter a 3-digit passcode as set in Service Code 52 to obtain access to the Service Mode.

NOTE:
See Service Code 52 for the setting of passcodes.

4-4. Display examples

The following pages show the sequence of button presses and screens displayed when working in some
standard configurations.

More or less options will be made available by the configuration of some service codes. For instance the
impedance measurement screens do not appear when impedance checking is switched off in service codes
03 and 04.

IM 12B6B3-E-E

NO

Y

ES

pH

p

H

pH

YES

pH

YES

NO

pH

pH

pH

YES

(See Temp
menu
Chapter 5)

Y

ES NO

TEMP.

M

ODE

N

O

YES

YES

NO

NO

NO

(See Auto
calibration
Chapter 6)

(See Manual
calibration
Chapter 6)

Y

ES

N

O

YES NO

Y

ES NO

MEASURE

MAN.CAL
DISPLAY

HOLD

TEMP.

AUT.CAL

MAN.CAL

DISPLAY

AUT.CAL

MAN.CAL

(See Sample
calibration
Chapter 6)

SETPOINTS
RANGE
SET HOLD

SERVICE

*

WASH

HOLD FAIL

YES NO

ENT

MEASURE

MAN.CAL
DISPLAY

HOLD

NO MODEYES

ENT

YOKOGAWA

MODE

TEMPERATURE

AUT.CAL

TEMP.MAN.

pH

mV

CONTACTS

S1

S2

WASH/S3

FAIL/S4

pH

pH

pH

pH

pH

pH

pH

pH

NO

NO

NO

NO

NO

NO

NO

NO

Display Access

Impedance of input 1

Impedance of input 2

Process temperature

Current output 1

Current output 2

Software release number

Offset
(as. pot. or
zero point)

Efficiency

(slope)

Press YES to fix

the selected second

line of display

YES

YES

NO

Y

ES

N

O

YES

NO

Y

ES

N

O

Y

ES

NO

Y

ES

NO

YES

NO

YES

NO

DISPLAY

DISPLAY

DISPLAY

DISPLAY

DISPLAY

DISPLAY

DISPLAY

DISPLAY

12B6B3-21

D

isplay Functions pH (Default)

NO

YES

(See Manual
Impedance
check Chapter 5)

NO

4-4 Operation

4-5. Display functions

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

IM 12B6B3-E-E

pH

pH

1

2B6B3-19

p

H

pH

T

EMP.

See Setpoint
Menu
chapter 5.5

See Wash
Menu
chapter 5.4

pH

NO

NO

NO

YES

YES

pH

pH

YES

NO

YES

NO

TEMP.

HOLD

HOLD

YES

NO

YES

NO

NO

DATE

pH

pH

pH

TIME

CAL -1

VALUE

Display Fuctions pH (ORP)

Service Code 01 Set for pH.
Service Code 02 Set for ORP
on parameter 2.

DISPLAY

D

ISPLAY

D

ISPLAY

D

ISPLAY

D

ISPLAY

"Logbook Scrolling"

The display can give information

about calibrations performed

with date and time.

The example below shows

A

symmetry Potential.

S

crolling of Data is also

available on Slope.

As Pot ORP
Impedance Input 1
Impedance Input 2

When these functions
are enabled in Service

Codes.

Measuring
Mode

As Pot

Display 2

Back to
the Top

p

H

Y

ES

NO

D

ISPLAY

DISPLAY

DISPLAY

DISPLAY

DISPLAY

DISPLAY

DISPLAY

D

ISPLAY

DISPLAY

D

ISPLAY

YES

NO

NO

NO

NO

NO

NO

NO

NO

N

O

p

H

NO

MODE

NO

NO

Y

ES

YES

YES

YES

YES

YES

YES

YES

NO

NO

NO

NO

pH

p

H

pH

pH

Y

ES

NO

Y

ES

NO

YES

NO

YES

NO

Y

ES

NO

YES

NO

YES

NO

pH

p

H

pH

pH

pH

pH

pH

pH

pH

MAN.CAL

MEASURE

M

AN.CAL

D

ISPLAY

HOLD

T

EMP.

A

UT.CAL

A

UT.CAL

D

ISPLAY

YES

NO

YES

NO

YES

N

O

YES

NO

YES

NO

YES

NO

YES NO

ENT

YES NO

ENT

Y

ES NO

E

NT

Y

ES NO

ENT

YES NO

ENT

NO

NO

YES

p

H

NO

YES

YES

See Temp
Menu
chapter 5

See Hold
Menu
chapter 5

YES

See Man.
Imp. Check
chapter 5

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

Operation 4-5

IM 12B6B3-E-E