Eutech Instruments ALPHA PH DIFFERENTIAL PROBE User Manual

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INSTRUCTION MANUAL

ECFP21A1A1

Differential pH Sensor

1 ½ Inch NPT Mounting Threads

Technolo

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68X216866 Rev 0 10/04

Preface

This instruction manual serves to explain the use of the ECFP21A1A1 1½ inch pH sensor and is written to
cover as many applications as possible. Please do not hesitate to contact Eutech Instruments or an
authorized representative with questions or concerns.

The information presented in this instruction manual is subject to change without notice as improvements are
made, and does not represent any commitment whatsoever on the part of Eutech Instruments.

Eutech Instruments cannot accept any responsibility for damage or malfunction of the sensor due to
improper use.

Eutech Instruments Pte Ltd.
All rights reserved
Rev 0 10/04

Safety Information

The ECFP21A1A1 1½ inch pH sensor shall be installed and operated only in the manner specified. Only a
skilled, trained or authorized person should carry out installation, setup and operation of the sensor system.

Before using the sensor, make sure that the sensor cable is connected as specified. Failure to do so may result
in permanent damage to the sensor or controller.

Protection against electric shock will be achieved only by observance of the corresponding installation rules.

TABLE OF CONTENTS

1. INTRODUCTION................................................................................................................................... 1

1.1. G

1.2. I

ENERAL INFORMATION.................................................................................................................... 1

NTENDED USE ................................................................................................................................... 2

2. PRODUCT DESCRIPTION.................................................................................................................. 3

2.1. S

2.2. S

ENSOR DESCRIPTION........................................................................................................................ 3

PECIFICATIONS................................................................................................................................. 4

3. INSTALLATION....................................................................................................................................5

3.1. W

3.2. M

3.2.1. P

3.2.2. I

IRING.............................................................................................................................................. 5

OUNTING HARDWARE..................................................................................................................... 6

IPE TEE MOUNTING...................................................................................................................... 7

MMERSION MOUNTING ............................................................................................................... 10

4. PH SENSOR MAINTENANCE .......................................................................................................... 12

4.1. CLEANING THE PH SENSOR HEAD....................................................................................................12

4.2.

4.3.

PH SENSOR REFURBISHMENT - REPLACING THE SALT BRIDGE AND REFERENCE SOLUTION............ 13

PH SENSOR TROUBLESHOOTING ...................................................................................................... 14

5 PH SENSOR SPARE PARTS AND ACCESSORIES.......................................................................16

5.1.1 Reference Cell Replacements.................................................................................................. 16

5.1.2 pH Buffer Standards ............................................................................................................... 16

5.1.3 Mounting Hardware Replacements ........................................................................................ 17

6 WARRANTY......................................................................................................................................... 18

7 RETURN OF ITEMS...........................................................................................................................19

Instruction manuals ECFP21A1A1

1. INTRODUCTION

1.1. General Information

Thank you for purchasing the ECFP21A1A1 Differential pH Sensor. This industrial sensor has many
enhanced features that offer superior performance in process applications:

• Differential pH measurement technology minimizes susceptibility to ground loops.

• A built in pre-amplifier eliminates high impedance wiring problems.

• A replaceable heavy-duty quad junction salt bridge for extended life in severe applications.

• A large reference reservoir filled with buffered solution minimizes the effects of dilution and extends

the life of the reference electrode.

• Easily refurbished in the field by replacing the salt bridge and reference solution, extending the life of
the sensor.

The product is designed for continuous use in industrial process applications and complies with safety
regulations currently in force. Improper use could lead to hazards for the user or a third-party, and/or adverse
effects to the plant or other equipment.

Eutech Instruments does not accept any liability for damage that may arise if information in this
manual is not followed. Therefore, the operating instructions and specifications must be read and
understood by all persons involved in installation and operation of this equipment.

This manual identifies safety instructions and additional information by means of the following symbols:

This symbol draws attention to safety instructions and warnings of potential danger,
which if neglected, could result in injury to persons and/or damage to property.

This symbol identifies additional information and instructions, which if neglected, could
lead to inefficient operation and possible loss of production.

It is recommended that this manual be made accessible to everyone who may need it as a reference.
Please contact Eutech Instruments or an authorized representative with any questions.

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Instruction manuals ECFP21A1A1

1.2. Intended use

ECFP21A1A1 1½ inch pH sensor is designed to continuously measure pH and temperature in aqueous
solutions in accordance with the technical product specifications in Section 2.2 of this manual.

Any other use, or use not mentioned here, that is incompatible with the technical specifications is deemed
inappropriate. The operator is solely responsible for any damage arising from such use.

Other prerequisites for appropriate use include:

• Observing the instructions, notes and requirements set out in this instruction manual.

• Observing all local safety regulations.

• Observing all warnings and cautions in the documentation regarding all products used in this

measurement system, including the pH sensor, mounting hardware, analyzer electronics and
cabling.

• Observing the prescribed environmental and operational conditions.

• Observing chemical compatibility with all wetted materials.

1.3. Safety Instructions

The ECFP21A1A1 1½ inch pH sensor should be installed and operated only by
personnel familiar with the sensor and qualified for such work.

A defective sensor should be returned to Eutech Instruments for repair or
replacement. Contact Eutech Instruments to obtain a Return Goods Authorization
(RGA) number.

No modifications to the ECFP21A1A1 1½ inch pH sensor are allowed. The
manufacturer/supplier accepts no responsibility for damage caused by unauthorized
modifications. The risk is borne entirely by the user.

1.4. Removal from Service / Correct Disposal of the Sensor

Removal from Service

• Disconnect the cable wiring from the controller terminal block.

• Remove the sensor from the mounting hardware.

Correct Disposal of Unit

• When the sensor is taken out of service, observe the local environmental regulations for correct
disposal.

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Instruction manuals ECFP21A1A1

2. PRODUCT DESCRIPTION

2.1. Sensor Description

The ECFP21A1A1 1½ inch pH sensor uses a differential measurement technique to maximize lifetime in
continuous industrial applications. The ground rod and encapsulated preamplifier construction reduce the
effects of ground loops and allow the pH signals to be transmitted up to 3,000 feet. A replaceable heavy­duty quad junction salt bridge makes it simple to refurbish the sensor when necessary. The large reference
reservoir filled with buffered solution minimizes the effects of dilution and extends the life of the reference
electrode. The wires in the sensor cable are color coded to allow for quick and easy installation into the
Alpha pH2000D Controller.

The wires in the sensor cable are color coded to match the
terminal connection within the Alpha pH2000D Controller.

Figure 2.1: 1½ inch pH Sensor

with Salt Bridge Options

Figure 2.2: pH sensor hook-up

The sensor body has 1½ inch NPT threads for the following
mounting options:

¾ Standard 1½ inch NPT pipe tee insertion.
¾ Immersion mounting assembly.

Salt bridges come in two styles:

¾ Protected for standard applications.
¾ Flat for sanitary applications.

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Instruction manuals ECFP21A1A1

2.2. Specifications

Wetted Materials……………………………. Sensor Body - CPVC

Salt Bridge Junctions - Kynar®
pH Electrode - General glass
Ground Rod - 316 Stainless Steel
O-Ring Seals - Viton®

(Consult factory for customized material construction)

Operating Temperature……………………..
Maximum Pressure………………………….
Maximum Flow Rate………………………... 3 m/sec (10 ft/sec)
Measuring Range…………………………… 0 to 14 pH
Resolution……………………………………. 0.01 pH
Standard Sensor Cable Length……………. 3 m (10 ft)
Cable Wire Colors…………………………... White Wire (-5V)

Maximum Transmission Distance…………. 914 m (3,000 ft)

The sensor will arrive with a protective cap that keeps the sensor hydrated.
For short-term storage, put several drops of Eutech Instruments’ storage solution on the absorbent

material in the protective cap and replace the cap on the sensor. This keeps the process electrode
and salt bridge moist.

For extended storage, repeat the above short-term storage procedure every 2 to 4 weeks,
depending on the surrounding environmental conditions.

Make sure all wetted materials are compatible with process chemicals at operating temperatures
and pressures.

-5°C to 95°C (23°F to 203°F)
100 psi @ 100°C (100 psi @ 212°F)

Black Wire (Ground)
Red Wire (pH Electrode/Active(Measure))
Green Wire (Reference Electrode)
Yellow Wire (Temperature/NTC 300)
Drain/Shield (Earth)

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