YOKOGAWA PH402G User's Manual

Instruction

Manual

Model PH402G

pH Converter

YOKOGAWA

IM 12B6B3-E-E 8th Edition

	TABLE OF CONTENTS
PREFACE
1. INTRODUCTION AND GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		1-1
1-1.	Instrument check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	.1-1
1-2.	Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1-2

2. PH402 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1 2-1. General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1 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
3-7-3. Sensor cable connections using junction box (BA10) and extension cable (WF10)	. . . .3-13
3-8. Tag plate mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . .3-15
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-2 5-1-1. Manual temperature 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
5-2-1. Setpoints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	.5-9
5-2-2. Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5-11
5-2-3. Hold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5-13
5-2-4. Wash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5-15
5-2-5. Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5-16
5-3. Notes for guidance in the use of service coded settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5-17
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
10-6.	Software history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		10-7

GLOSSARY

ERROR CODES

QUALITY INSPECTION STANDARD & CERTIFICATE

IM 12B6B3-E-E

PREFACE

WARNING

Electric discharge

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

Installation and wiring

The EXA analyzer should only be used with equipment that meets the relevant IEC, American or Canadian standards. Yokogawa accepts no responsibility for the misuse of this unit.

CAUTION

The Instrument is packed carefully with shock absorbing materials, nevertheless, the instrument may be damaged or broken if subjected to strong shock, such as if the instrument is dropped. Handle with care.

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

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

Notice

Contents of this manual are subject to change without notice. Yokogawa is not responsible for damage to the instrument, poor performance of the instrument or losses resulting from such, if the problems are caused by:

●Improper operation by the user.

●Use of the instrument in improper applications

●Use of the instrument in an improper environment or improper utility program

●Repair or modification of the related instrument by an engineer not authorized by Yokogawa.

Warranty and service

Yokogawa products and parts are guaranteed free from defects in workmanship and material under normal use and service for a period of (typically) 12 months from the date of shipment from the manufacturer. Individual sales organisations can deviate from the typical warranty period, and the conditions of sale relating to the original purchase order should be consulted. Damage caused by wear and tear, inadequate maintenance, corrosion, or by the effects of chemical processes are excluded from this warranty coverage.

In the event of warranty claim, the defective goods should be sent (freight paid) to the service department of the relevant sales organisation for repair or replacement (at Yokogawa discretion). The following information must be included in the letter accompanying the returned goods:

●Part number, model code and serial number

●Original purchase order and date

●Length of time in service and a description of the process

●Description of the fault, and the circumstances of failure

●Process/environmental conditions that may be related to the installation failure of the device

●A statement whether warranty or non-warranty service is requested

●Complete shipping and billing instructions for return of material, plus the name and phone number of a contact person who can be reached for further information.

Returned goods that have been in contact with process fluids must be decontaminated/disinfected before shipment. Goods should carry a certificate to this effect, for the health and safety of our employees. Material safety data sheets should also be included for all components of the processes to which the equipment has been exposed.

IM 12B6B3-E-E

Introduction 1-1

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.

MODEL	PH402G-E-1-E	N
SERIA NO.	FD 020 034
SUPPLY	110-120 VAC, 50/60 Hz, 10 VA

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 grommet 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

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/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 particular application. An example of an adjustable item is the type of temperature sensor used. The EXA can be adjusted for any one of five different types of temperature sensors.

To record such configuration adjustments, write changes in the space provided in Chapter 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 compromise, to assure the user of continued accurate performance in even the most demanding industrial installations.

IM 12B6B3-E-E

Specification 2-1

2. PH402 SPECIFICATIONS

2-1. General

A.Input specifications

:Dual high impedance inputs (2 x 1013Ω) 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 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. Manual adjustment to grab sample.

Slope and Asymmetry Potential setting.

Zero point can be selected for calibration and display instead 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,
	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) 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. 100 VAC ± 15% 50/60 Hz. 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
	& 8k55Ω
- Linearity	: ≤0.3 oC ± 0.02 mA
- Repeatability	: ≤0.1 oC ± 0.02 mA
- Accuracy	: ≤0.4 oC ± 0.02 mA

B.Ambient operating temperature

:-30 to +70 oC (-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.
Case color	: off-white and
Cover color	: moss green.
Cable entry	: via six 1/2” polyamide glands.
Cable terminals : are provided for up to 2.5
	mm2 finished wires.
Protection	: weather resistant to IP65 and
	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
					code
PH402G		....................................				pH/ORP transmitter
		................................-E				Always E
Supply			...........................-1			115 Volts 50/60 Hz
voltage			-2...........................			230 Volts 50/60 Hz
			-4...........................			24 Volts DC
			-5...........................			100 Volts 50/60 Hz
Instruction manual				-E		English language *
Options				.........	/U	Pipe and wall mounting
						hardware
				......	/PM	Panel mounting hardware
				........	/Q	Quality certificate
				....	/SCT	Stainless steel tag

* For other languages contact local sales office

IM 12B6B3-E-E

Installation and wiring 3-1

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 optional brackets

●Surface mounting on a plate (using bolts from the back)

●Wall mounting on a bracket (for example, on a solid wall)

●Pipe mounting using a bracket on a horizontal or vertical pipe (maximum pipe diameter 50 mm)

144(5.67) 144(5.67)

24(1)

16.5

(0.65)

115.5(4.55)

Figure 3-1. Housing dimensions and layout of glands

min.185 (7.25)

min.195 (7.75)

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

			(5	.4	3	)
		8
1	3

M6

138 M5

M6

Figure 3-2. Panel mounting diagram

IM 12B6B3-E-E

3-2 Installation and wiring

200		(7.87)

wall mounting	pipe mounting	pipe mounting
80	(vertical)	(horizontal)
(3.15)
2x ø6.5
(0.26)
4x ø10
(0.4)

		145
70	(5.70)
(2.75)

2” ND. pipe

OPTION/U: Universal pipe/wall mounting kit

Figure 3-3. Wall and pipe mounting diagram

Figure 3-4. Internal view of EXA wiring compartment

IM 12B6B3-E-E

Installation and wiring 3-3

3-2. Preparation

Refer to figure 3-4. The relay contact terminals and power supply connections are under the screening (shielding) plate. These should be connected first. Connect the sensor, outputs and data communication connections last.

To open the EXA 402 for wiring:

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

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 figure 3-5).

9.Close the display board and switch on the power. Commission the instrument as required or use the default settings.

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

High voltage section

	Contact	Sensor	Contact	Analog		Communi-
	(S3,S4,FAIL)		(S1,S2)		Power	cation,
				output
	output	cables	output		cable	contact
				cables
	cables		cables			input

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

Figure 3-5. Glands to be used for cabling

IM 12B6B3-E-E

3-4 Installation and wiring

FRONT GLANDS

REAR GLANDS

SensorPower

0/4-20 mA	Output	Contact	S1
	signals
		output
			S2
0/4-20 mA
	RS485	Contact	S3/WASH
		output
			S4/FAIL
Contact input

Figure 3-6. System configuration

3-3. Wiring the power supply

3-3-1. General precautions

Make sure the power supply is switched off. Also, make sure that the power supply is correct for the specifications of the 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 regulations may require an external circuit breaker to be installed. The instrument is protected internally by a fuse. The fuse rating is dependent on the supply to the instrument. The 250 VAC fuses should be of the “time-lag” type, conforming to IEC127.

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

The internal fuse is located next to the power terminals (in the lower righthand corner).

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).

IM 12B6B3-E-E

Installation and wiring 3-5

														Contact																						Digital
Sensor Inputs														Input				mA Outputs																		Communications
	15		16		17		13	14		12		11		22		21		63		66				65				62				61				95			94				93		92				91
																						mA2									mA1								TL										TL
																										SCREEN																	SCREEN
	pH/ORP						ref. liquid				temp.
								earth			sens.
				SENSOR(S)										CONT						mA OUTPUT																					RS485

	Relay Contacts																								Power Supply
	71		72		73		51		52		53		41		42		43		31		32		33				3		2		1
	250V AC				250VDC																												FUSE
		5A			5A
	100V A				50W
																										100	VAC		100		mA
	C		NC		NO		C		NC		NO		C		NC		NO		C		NC		NO			115	VAC		100		mA		250VAC; T
																										230	VAC		50		mA
			S4						S3						S2						S1					24	VDC		1		A

High voltage compartment

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

To protect the instrument against interference, the housing should be connected to ground by a large area 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 are 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 instrument will momentarily display its unique serial number. After a brief interval, the display will change to the measured value. If errors are displayed or a valid measured value is not shown, consult the troubleshooting section (Chapter 8) before calling Yokogawa.

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 analog signals.

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

●The contact S1 is pre-programmed for high alarm function.

●The contact S2 is pre-programmed for a low alarm function.

●The contact S3 is not activated as an alarm (off).

●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.

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

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

1

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

2

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 Service code 04 = 1.0.1

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

Figure 3-9a. Impedance measurement jumper setting

IM 12B6B3-E-E

Installation and wiring 3-9

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

4

Jumper connections for : - Input 1, Low impedance - Input 2, Low impedance Service code 03 = 0.0.1

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

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

Figure 3-9b. Impedance measurement jumper setting

IM 12B6B3-E-E

3-10 Installation and wiring

Sensor inputs

Contact

mA

Digital

input

outputs

communications

15 16

17

13

14

12

11

22 21

63

66

65

62

61

95

94

93

92

91

mA2

mA1

TL

TL

SCREEN

SCREEN

INPUT 1

INPUT 2

INPUT 1

HIGH IMP

LOW IMP

LOW IMP

INPUT 2

HIGH IMP

Sensor(s)

Cont

mA output

RS485

Relay contacts

Power supply

71	72	73	51	52	53	41	42	43	31	32	33
250V AC		250VDC
5A		5A
100V	A	50W
C	NC	NO	C NC		NO C NC NO C NC NO
	S4			S3			S2			S1

	3	2	1
100	VAC	100	mA		Fuse
115	VAC	100	mA
230	VAC	50	mA	250VAC; T
24	VDC	1	A

Figure 3-10. Terminal identification labels

3-7. Sensor wiring

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

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:

● 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.)

IM 12B6B3-E-E

to measuring element to reference

to screen (shield)

Installation and wiring 3-11

3-7-1. Connection cable

There are two types of connection cable, one for single sensors and one for combined sensors. The former is a coaxial cable and has only two connections.

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

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

● Red

● Blue

● White

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

14Liquid earth (solution ground) connection

15Input no. 1 (normally the measuring element)

16Screen (shield) for input no. 1

	Green *		pH transmitter
		Red	11	Temperature
		Blue
			12	Temperature
	Yellow *	Red
			13 Reference
		Black	14	Solution ground
	Red *	Red
			15 Glass (measure)
		Blue	16	Shield
		Blue
			17	Shield
		* Cable markers

11 Temperature

12 Temperature

13 Reference

14 Solution ground

15 Glass (measure)

16 Shield 17

FU20/FU25 4-in one sensor

Note: Connect cables to similarly marked terminals: 11 to 11, 12 to 12, etc.

Green	*	Red	11 Temperature		11 Temperature
		Blue
			12	Temperature	12	Temperature
		Blue			13	Reference
			13	Reference
		Black			14	Solution ground
	Blue *		14	Solution ground
		Red			15 Glass (measure)
			15 Glass (measure)
			16	Shield	16	Shield
		White			17	Shield
			17	Shield

* Cable markers

Combined pH/ref sensors

Retractable sensor assembly PR20

(Also PD20, PF20 & PS20)

NOTE:

Connect cables to similarly marked terminals: 11 to 11, 12 to 12, etc.

Figure 3-11a. Sensor wiring

IM 12B6B3-E-E

3-12 Installation and wiring

Green*	RED	TEMPERATURE
	11
	BLUE	TEMPERATURE
Yellow*	12
	RED	REFERENCE
	13
	BLACK	SOLUTION GROUND
Red*	14
	RED	GLASS (MEASURE)
	15
	BLUE	SHIELD
	16
	BLUE	SHIELD
	17
	* Cable Markers

Separate sensors ORP

Temp. sensors optional for indication only, not for compensation

Service code 01 set to ORP

Green*	RED	11	TEMPERATURE
	BLUE	12	TEMPERATURE
	BLUE	13	REFERENCE
Blue*	BLACK	14	SOLUTION GROUND
	RED	15	GLASS (MEASURE)
		16	SHIELD
	WHITE	17	SHIELD
	* Cable Markers

Combined pH/ORP sensor

Temp. sensors optional for indication only, not for compensation

Service code 01 set to ORP

11	TEMPERATURE
12	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)

Green*	RED	11	TEMPERATURE
	BLUE	12	TEMPERATURE
	BLUE	13	REFERENCE
Blue*	BLACK	14	SOLUTION GROUND
	RED	15	GLASS (MEASURE)
		16	SHIELD
	WHITE	17	SHIELD
		* Cable Markers

Separate sensors ORP/ref sensor

Temp. sensors optional for indication only, not for compensation

Service code 01 set to ORP

Green*	RED	TEMPERATURE
	11
	BLUE	TEMPERATURE
Yellow*	12
	RED	REFERENCE
	13
	BLACK	METAL ORP SENSOR
Red*	14
	RED	GLASS (MEASURE)
	15
	BLUE	SHIELD
	16
	BLUE	SHIELD
	17
	* Cable Markers

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)

	11	11	TEMPERATURE
	12	12	TEMPERATURE
	13	13	REFERENCE
		14	SOLUTION GROUND (ORP)
	14	15	pH
16	15	16	SHIELD
		17

"All in one" ORP

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

Figure 3-11b. Sensor wiring

> Connect ions normal pH

> Connections differential pH

A-

B-13

C-

D-14

E-11

pH

F-12

pH

S-3 or 63

ref

LE

pH ref LE

temp

temp

A- B-14 C-13 D-17 E-11 F-12

S-3 or 63

IM 12B6B3-E-E

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

2.Discard the seal. This will be replaced later by the special grommet

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).

15	15
16	16
14	14
14	14
17	17
13	13
12	12

11

11

11 Red

12 Blue

15 Core 16 Screen White Co-axial cable

17 Overall Screen

13 Core 14 Screen

Brown Co-axial Cable

EXA pH TRANSMITTER / CONVERTER

11 11

12 12

WF10 Cable

13 13

17 14

15 15

16 16

14 17

12 (blue)

15 (core)

Co-axial cable

(white)

16 (screen)

Note that cables 14 & 17 connect to

terminals 17 & 14 respectively.

17 (overall screen)

13 (core)

	Co-axial cable
14 (screen)	(brown)

11 (red)

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

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3-14 Installation and wiring

Extension cable may be purchased in bulk quantities or in pre-finished lengths. In the case of bulk quantities cut to length, then it is necessary to terminate the cable as shown below.

Termination procedure for WF10 cable.

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

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

3 cm heat shrink

9 cm

remove insulation

Fig. 3-13a.

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

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

3 cm

cotton threads

Fig. 3-13b.

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

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

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

11
12
17
15
16
13
14
Fig. 3-13.c

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

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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.

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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.

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4-2 Operation

Output hold flag	Manual temperature	Fail flag
	compensation flag
		Menu pointer flags

Units

Main display

Message display

Key prompt flags

Selection keys

YES	: Accept setting
NO	: Change setting

HOLD	TEMP.MAN.	FAIL	MODE
pH					Commissioning
mV					function menu
			MEASURE
			AUT.CAL	SETPOINTS
	YES	NO	MAN.CAL	RANGE
			DISPLAY	SET HOLD
		ENT
			TEMPERATURE	WASH
			HOLD	SERVICE
Y	NO	MODE	CONTACTS	*	Commissioning
					mode access key
			S1
			S2
		ENT	WASH/S3		Relay contact
			FAIL/S4
					status indicators

Adjustment keys	YOKOGAWA

>: Choose digit to adjust

^ : Adjust digit ENT : Confirm change

Measure/Maintenance

mode key

Broken line indicates area that can be seen through front cover

Figure 4-1. PH402 operator interface

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.
						AUTO CAL
						MAN CAL
						DISPLAY
						SETPOINT
						WASH
						MAN.IMP
						TEMPERATURE
						HOLD
			Press again to return to the measuring mode (press twice when hold is activated).
YES/NO keys These are used to select choices from the menu.
			YES			is used to accept a menu selection.
			NO			is used to reject a selection, or to move ahead to the next option.
DATA ENTRY keys (											)
						is used as a “cursor” key. Each press on this key moves the cursor or flashing digit
						one place to the right. This is used to select the digit to be changed when entering
						numerical data.
						is used to change the value of a selected digit. Each press on this key increases the
						value by one unit.The value can not be decreased, so in order to obtain a lower value,
						increase past nine to zero, then increase to the required number.
						When the required value has been set using the > & ^ keys, press ENT to confirm the
						data entry. Please note that the EXA 402 does not register any change of data until
						the ENT key is pressed.
		key	This is the commissioning mode key. It is used to obtain access to the commissioning
	*

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

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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.

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4-4 Operation

4-5. Display functions

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

pH

MEASURE

AUT.CAL

MAN.CAL

DISPLAY

TEMP.

HOLD

MODE	Display Access

pH						Impedance of input 1	pH
			AUT.CAL
	YES	NO					YES	NO
			YES	(See Auto
	NO			calibration			NO
				Chapter 6)
pH						Impedance of input 2	pH
			YES	(See Manual
	YES	NO	MAN.CAL	calibration			YES	NO
				Chapter 6)
	NO						NO
pH					Software release number		pH
			YES (See Sample
	YES	NO	MAN.CAL	calibration			YES	NO
				Chapter 6)
	NO						NO
pH						Process temperature	pH
						YES
	YES	NO	DISPLAY				YES	NO
	NO						NO
pH						Current output 1	pH
			YES (See Manual
	YES	NO		Impedance			YES	NO
				check Chapter 5)
	NO						NO
pH						Current output 2	pH
			YES	(See Temp
	YES	NO	TEMP.	menu			YES	NO
				Chapter 5)
	NO						NO
						Offset	pH
						(as. pot. or
						zero point)
HOLD	TEMP.MAN.	FAIL	MODE				YES	NO
pH
mV							NO
			MEASURE
			AUT.CAL		SETPOINTS
	YES NO		MAN.CAL		RANGE	Efficiency	pH
			DISPLAY		SET HOLD
		ENT	TEMPERATURE		WASH	(slope)
			HOLD		SERVICE
YES	NO	MODE	CONTACTS		*	Press YES to fix	YES	NO
			S1			the selected second
			S2			line of display

WASH/S3

ENT

FAIL/S4

DISPLAY

DISPLAY

DISPLAY

DISPLAY

NO

DISPLAY

DISPLAY

DISPLAY

DISPLAY

YOKOGAWA

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Operation 4-5

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

			Service Code 01 Set for pH.
pH		pH	Service Code 02 Set for ORP
			on parameter 2.
MEASURE
AUT.CAL
MAN.CAL			YES NO
DISPLAY	YES		DISPLAY
TEMP.
HOLD

	MODE			NO
	pH			pH
			AUT.CAL			"Logbook Scrolling"
	YES	NO		YES	NO	The display can give information
					DISPLAY
						about calibrations performed
	NO			NO		with date and time.
						The example below shows
	pH			pH		Asymmetry Potential.
						Scrolling of Data is also
	YES	NO		YES	NO	available on Slope.
			MAN.CAL			As Pot ORP
					DISPLAY	Impedance Input 1
	NO			NO		Impedance Input 2
						When these functions
	pH			pH		are enabled in Service
						Codes.
	YES	NO		YES	NO
					DISPLAY
	NO		Measuring	NO
	pH		Mode	pH		pH

	YES
YES NO	As Pot	YES NO		NO	NO
DISPLAY				YES		DISPLAY
	Display 2	ENT	DISPLAY	DATE

NO		See Man.	NO			YES
pH		Imp. Check				pH
		chapter 5	pH
		YES				NO
YES	NO		YES	NO		YES	NO	DISPLAY
				ENT
					DISPLAY	TIME
NO		See Setpoint	NO			YES
pH		Menu
		chapter 5.5	pH			pH
		YES				NO
YES	NO		YES	NO		YES	NO	DISPLAY
	TEMP.			ENT	DISPLAY	CAL -1
NO		See Wash	NO			YES
pH		Menu	pH			pH
		chapter 5.4
		YES				NO
YES	NO		YES	NO		YES	NO	DISPLAY
				ENT	DISPLAY	VALUE
	HOLD
NO		See Temp	NO			YES
pH		Menu	pH
		chapter 5
						YES
		YES
YES	NO		YES	NO
	TEMP.			ENT	DISPLAY	YES
NO		See Hold	NO
pH		Menu	pH			pH
		chapter 5
		YES
YES	NO		YES	NO		YES	NO
		Back to						DISPLAY
	HOLD				DISPLAY
		the Top				YES
NO

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