Yokogawa SC72 User Manual

User’s Manual

Model SC72 Personal Conductivity Meter

IM 12D03D02-01E

3rd Edition

Preface

Before using the Model SC72 Personal Conductivity Meter, read this manual thoroughly.

For safe use of this meter, the meter and the instruction manual include the following symbol marks.

Preface

WARNING

CAUTION

: Indicates that serious injury may result, if users fail to follow

instruction manual procedures.

: Indicates that minor injury to personnel, or serious damage to

the product, may result if users fail to follow procedures in the instruction manual.

WARNING

Do NOT use this instrument where there is a possibility of electrical shock. Do NOT touch any part of the electrode immediately after measuring very hot liquids —

otherwise, you may get burnt.

CAUTION

If the meter will not be used for an extended period of time, be sure to remove the battery. Otherwise battery leakage may occur, and may cause damage to the meter or cause erroneous meter operation.

The contents of this manual are subject to change without prior notice. Yokogawa Electric Corporation assumes no liability for damage, defects, or loss of the

product caused by any of the following:

User error; Inappropriate or out-of-specifications use of the product; Use in an unsuitable environment; Repair or modification of this or related products by persons other than Yokogawa-

authorized engineers.

Preface

Liquid crystal display (LCD) display characters

The numeric LCD display is used to mimic alphabetic characters, as shown below:

Alphabet

Display

Alphabet

Display DisplayNumerals

All display elements shown ON

Note Regarding Panels Shown in this Manual:

Panels shown in this manual should be regarded as examples. Actual panel format may vary depending on parameter settings and on type of connected sensor.

Showing all display elements lit

Display (gray represents flashing state)

F00.EPS

Flashing state: Lit state:

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Warranty and Service

Yokogawa products and parts are guaranteed to be free from defects in workmanship and materials under normal use and service for a period of (typically) 12 months from the date of shipment from the manufacturer.

Individual sales units may offer different warranty periods, so the original purchase order should be consulted for the conditions of sale. Damage caused by normal wear and tear, inadequate maintenance, corrosion, or due to chemical processes, is excluded from this warranty coverage.

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

Model code and serial number Copy of original purchase order showing the date Length of time used, and the measuring environment Fault symptoms, and circumstances of failure Statement whether service under warranty or out-of-warranty service is requested Complete shipping and billing instructions for return of goods, plus the name and

phone number of a contact person who can be reached for further information

Goods that have been in contact with process fluids must be decontaminated / disinfected before shipment, and a statement to this effect should be included. Safety data sheets for all process components that the goods have exposed to should also be included.

Preface

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Contents

CONTENTS

Preface...................................................................................................................... 1-1

1. Outline ................................................................................................................. 1-1

1.1 Features ......................................................................................................................... 1-1

1.2 Personal Conductivity Meter Specifications .................................................................. 1-2

1.3 When You Receive This Conductivity Meter................................................................. 1-3

1.4 Contents of Model SC72 Personal Conductivity Meter Package ................................. 1-4

1.5 Component Names and Functions ................................................................................ 1-5

1.6 Sensor Part Names and Functions ............................................................................... 1-6

1.7 Options (Available Separately) ...................................................................................... 1-8

1.8 Spare Parts .................................................................................................................... 1-8

2. Preparation.......................................................................................................... 2-1

2.1 Installing the Batteries ................................................................................................... 2-1

2.2 Connecting Sensor Cable.............................................................................................. 2-2

2.3 Setting Date and Time................................................................................................... 2-3

2.4 Setting Temperature Unit .............................................................................................. 2-4

2.5 Setting Cell Constant ..................................................................................................... 2-4

2.6 Setting Temperature Compensation Coefficient ........................................................... 2-6

3. Measurement ...................................................................................................... 3-1

3.1 Precautions .................................................................................................................... 3-1

3.2 Measurement Procedures ............................................................................................. 3-2

3.3 Measurement Panel....................................................................................................... 3-3

3.4 Saving Measured Value ................................................................................................ 3-3

4. Keyswitch Functions.......................................................................................... 4-1

4.1 Names and Functions of Keys ...................................................................................... 4-2

4.2 Liquid Crystal Display and Display Items ...................................................................... 4-4

4.3 Function Modes ............................................................................................................. 4-5

5. Handling of the SC72 Personal Conductivity Meter ........................................ 5-1

5.1 Tips to Maintain Meter Performance ............................................................................. 5-1

5.2 Washing the Electrode .................................................................................................. 5-2

5.3 Cleaning and Drying Connector .................................................................................... 5-3

5.4 Calibration with Standard Solution ................................................................................ 5-4

5.5 Storage and Maintenance ............................................................................................. 5-7

6. Troubleshooting ................................................................................................. 6-1

6.1 Causes of Abnormal Conductivity Display .................................................................... 6-1

6.2 Error Messages and Corrective Action ......................................................................... 6-2

6.3 Causes of Abnormal Measured Value .......................................................................... 6-4

6.4 Other conditions............................................................................................................. 6-4

7. Measuring Principles of this Instrument .......................................................... 7-1

7.1 What Is Conductivity? .................................................................................................... 7-1

7.2 Principles of Operation .................................................................................................. 7-2

7.3 Temperature Compensation and Finding Temperature Compensation Coefficient ..... 7-3

7.4 Wetted Part Materials of Sensors ................................................................................. 7-4

Appendix ..................................................................................................................... 1

Revision Record .......................................................................................................... i

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1. Outline

The Model SC72 Personal Conductivity Meter is an accurate, portable, easy-to-use conductivity meter. It includes not only self-diagnostic functions, to help ensure validity of readings, but also data storage functions to allow users to check past data. The meter is of waterproof construction so that it can safely be used outdoors on a rainy day, and can also withstand being accidentally dropped into water.

1.1 Features

Water r esistant case

When this meter is used with its dedicated sensor, it meets the requirements of class IP67 “Degree of Protection to be Provided by Enclosures” in IEC 60529.

Wide measurement range, and convenient “Auto Range” function

Sensors are available to cover measurement ranges between 0 to 2.000 mS/cm and 0 to 2 S/cm. Auto-range functions automatically set the optimum measurement range, making measurement easy.

Automatic temperature compensation

Automatic temperature compensation functions are provided for liquid measurement. Conductivity referenced to 258C can be obtained in solutions with temperature coefficients between 0.00 and 9.99%/8C. The temperature coefficients for NaCl solutions are already stored in the meter.

Calendar and time functions

Internal time functions allow “one-touch checking” of measurement date and time.

Data storage function

Up to 300 conductivities and temperature measurements, and their measurement date and time, can be saved. This function allows you to check past measurement data.

Automatic power off function

The meter will power off automatically if not operated during a preset time interval. The time interval can be set in one-minute increments in the range 1 to 120 minutes to

meet your application requirements. This automatic power off function can also be disabled, but it is wise to leave it enabled to conserve the batteries.

Simple alarm clock function

The meter can issue an alarm signal at a specified time. Even when meter power is turned off, the internal clock can issue an alarm signal.

Internal self-diagnostic functions display messages when appropriate. Bright easy-to view large LCD

Displays liquid conductivity, liquid temperature, temperature coefficient, date and time.

1. Outline

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1-1

1. Outline

1.2 Personal Conductivity Meter Specifications

Applicable measurement range:

• Sensors for high purity water measurement (cell constant: 0.05 cm-1) Conductivity: 0 to 2mS/cm, 0 to 20mS/cm, 0 to 200mS/cm, 0 to 40MV•cm Temperature: 0 to 808C*

• For general-purpose sensors (cell constant: 5 cm-1) Conductivity: 0 to 20mS/cm, 0 to 200mS/cm, 0 to 2mS/cm, 0 to 20mS/cm,

0 to 200mS/cm,

Temperature: 0 to 808C*

• For chemical-corrosion-resistant sensors (cell constant: 5 cm-1) Conductivity: 0 to 20mS/cm, 0 to 200mS/cm, 0 to 2mS/cm, 0 to 20mS/cm,

0 to 200mS/cm

Temperature: 0 to 808C*

• Sensors for high-conductivity measurement (cell constant: 50 cm-1) Conductivity: 0 to 2mS/cm, 0 to 20mS/cm, 0 to 200mS/cm, 0 to 2S/cm Temperature: 0 to 808C*

Resolution: Conductivity: Least significant digit: 1 digit;

Temperature: 0.18C

Repeatability (Conductivity):

62% (65% for general-purpose sensor on 0 to 200mS/cm measurement range)

Accuracy (Temperature): 60.78C (in the range 0 to 708C)

618C (when exceeding 708C)

Temperature compensation range:

variable 0.00 to 9.99%/8C, also (preset) NaCl solution temperature coefficient Measurement converted to conductivity at standard temperature of 258C

Measured liquid temperature: 0 to 808C (0 to 508C when the sensor cable is immersed in

Ambient temperature:0 to 508C Construction: IEC 60529, IP67 class of protection from environment Power requirement: Two of size AA batteries (LR6) Automatic power off interval: May be set in range 1 to 120 minutes Battery life: About 200 hours of continuous use, for long-life alkaline battery (life

may vary depending on battery type and ambient conditions)

External dimensions: Approximately 150 (H) x 61 (W) x 42 (D) mm (not including

protruding portions)

Weight: Approximately 220 g (including batteries)

water)

1-2

*1: Display range is from -10 to 1208C.

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EMC Compliance: EMI (Emission): EN 61326-1 Class B

Test Item

Electromagnetic radiation disturbance

Frequency Range

30 to 1000 MHz

CISPR 16-1 and 16-2

EMS (Immunity): EN 61326-1 Table 2 (For industrial locations)

Test ItemNo.

Electrostatic

discharge

RF amplitude

modulated electromagnetic field

* A: Normal performance within the specification limits: ±20% of the measured value. B: Temporary degration or less of function or performance which is self-recoverable. ** Display value may be affected by strong electromagnetic field.

Test Specification Basic Standard

4 kV (contact) 8 kV (air)

80 to 1000 MHz, 10 V/m (unmodulated) 80% AM (1 kHz)

1.4 to 2.0 GHz, 10 V/m (unmodulated)

80% AM (1 kHz)

2.0 to 4.0 GHz,

3 V/m (unmodulated) 80% AM (1 kHz)

IEC 61000-4-2

IEC 61000-4-3

1.3 When You Receive This Conductivity Meter

Confirm that all SC72 meter package components (refer to Contents of Model SC72 Personal Conductivity Meter Package in Section 1.4 and sensor models described in Sec.

1.6, “Sensor Part Names and Functions.”) have been received. Carefully inspect the

meter and sensor, referring to Section 1.5, “Component Names and Functions” when assembling meter and sensor.

Particular attention should be taken:

* Not to twist or force the cable. * Not to hit or drop the meter. * Not to get the sensor connector dirty.

1. Outline

Basic Standard

T0101.EPS

Performance

Criteria*

B**

T0102.EPS

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1-3

1. Outline

1.4 Contents of Model SC72 Personal Conductivity Meter Package

Quick Manual

SC72 - - - AA

User's

Manual

Instrument Card

1-4

11 11 11 11

SC72 - 11 - - AA SC72 - 31 - - AA

*1 *1 *1 *1

Model Suffix code SC72

Sensors -00

-11

-21

-23

-31

-41

Label -J language - E

- -AA

*1 The meter model number and cell constants, as well as the sensor model no. (SC72SN-u-AA), are shown on the nameplate.

SC72 - 21 - - AA SC72 - 23 - - AA

Specification

Personal conductivity meter Meter only, without sensor With sensor for high purity water measurement (cable length: 0.75m) With general-purpose sensor (cable length: 0.75m) With general-purpose sensor (cable length: 3m) With chemical-resistant sensor (cable length: 0.75m) With sensor for high-conductiivity measurement (cable length: 0.75m) Japanese English Always -AA

SC72 - 41 - - AA

Name

No.

Personal conductivity meter

Two dry batteries

Two i nstruction manual

Non-slip pads (two)

Hand strap

Instrument card

Sensor for high purity water

measurement General-purpose sensor

Chemical-resistant sensor

Sensor for high-conductivity

measurement Sensor cleaner

(five cotton swabs)

F010401.EPS

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1.5 Component Names and Functions

1. Outline

O-ring

Sensor cable connector

Used to connect a dedicated conductivity sensor to the

personal conductivity meter.

Can attach hand strap here

Display

Displays conductivity,

temperature, and temperature coefficient simultaneously.

Key switches

PERSONAL SC METER

MODEL STYLE No.

E000001

2004.

Battery box cover fixing screw

SC72 S1.0

Instrument name plate

with model number and serial number

F010501.EPS

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1-5

1. Outline

1.6 Sensor Part Names and Functions

Four types of sensors are available for use with the Model SC72 Personal Conductivity Meter:

(1) sensor for high purity water measurement (cell constant 0.05 cm-1), (2) general-purpose sensor (cell constant 5 cm-1), (3) chemical-resistant sensor (cell constant 50 cm-1), and (4) sensor for high-conductivity measurement (cell constant 50 cm-1). Check the model

number and cell constant on the name plate to confirm which type of sensor you have.

Model number and cell constants display plate example

MODEL

SC72SN

SUFFIX NO.

SC72SN Conductivity sensors for personal conductivity meter

Specification

SC72SN

-11

-19

-21

-23

-29

-31

-39

-41

-49

-AA

1: Part number of SC82 (previous model).

* *2: Waterproofing is not guaranteed if you use SC82-type conductivity sensor in conjunction

with SC72 meter.

Conductivity sensor for personal conductivity meter For SC72; for high purity water measurement (cable length: 0.75m) For SC82; for high purity water measurement (cable length: 0.75m) For SC72; for general purpose type (cable length: 0.75m) For SC72; for general purpose type (cable length: 3m) For SC82; for general purpose type (cable length: 0.75m) For SC72; for chemical-resistant type (cable length:

0.75m) For SC82; for chemical-resistant type (cable length:

0.75m)

For SC72; for high conductivity measurement (cable length: 0.75m) For SC82; for high conductivity measurement (cable length: 0.75m) Always -AA

CELL CONST

Made in Japan

S1.0000001-11-AA STYLE

Cell constants

RemarksModel Suffix code

K9221XB

K9221XA

K9221XC

K9221XD

F010601.EPS

1-6

IM 12D03D02-01E

Sensor for high purity water measurement

SC72 - 11 - - AA

Model number and

cell constants display plate

Watertight cover

Prevents moisture from entering

connector and causing leakage between pins.

Connector

Connects sensor cable to

conductivity meter

Outer electrode

connection

(SUS316

stainless seel)

Inner electrode

(SUS316

stainless seel)

(SC72SN-11-AA)

Sensor body

Outer electrode (SUS316 stainless seel)

Sensor

cable

Sensor grip

Plastic body can

withstand temperatures up to 808C.

General-purpose sensor

Model number and

cell constants display plate

SC72SN-23-AA)

Watertight

cover

Connector

*1(SC72SN-21-AA,

Sensor body

Cover (Plastic)

SC72 - 21 - - AA SC72 - 23 - - AA

Inner electrode (Titanium)

Edge electrode (Titanium)

1. Outline

Sensor cable

Sensor grip

F010602.EPS

Chemical-resistant sensor

Model number and

cell constants display plate

Watertight

cover

*1(SC72SN-31-AA)

SC72 - 31 - - AA

Sensor

cable

Sensor for high-conductivity measurement

SC72 - 41 - - AA

Model number and

cell constants display plate

Watertight

cover

Connector

*1(SC72SN-41-AA)

Connector

Air vent

Sensor body (glass)

Inner electrode (platinum black)

Sensor grip

Air vent

*1 SC72SN-u will be described on sensor's name plate for the model number.

Sensor grip

Sensor body (glass)

Inner electrode (platinum black)

Sensor cable

F010603.EPS

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1-7

1. Outline

1.7 Options (Available Separately)

The following options are available for the Personal Conductivity Meter for your convenience. When ordering, specify part number shown below.

Standard solution

(Part no.: K9221ZA)

0.1mol/l NaCl solution for calibration (250ml)

This soft black carrying case holds conductivity meter and sensor.

Soft case

(Part no.: B9269KJ)

Approx. 280

Approx. 140

(Part no.: K9220XN)

Unit: mm

Approx. 30

This stand holds the sensor when the conductivity meter is used on a table. It is made of rustproof stailess steel.

1.8 Spare Parts

O-rings and gaskets are important parts to ensure that the SC72 meter is water resistant. Replace these parts as required. Refer to Section 5.5, “Storage and Maintenance” for replacement.

O-ring and gasket set

(Part no.: K9654AY)

Sensor stand

F010701.EPS

1-8

Two battery box gaskets Two sensor connection O-rings

F010801.EPS

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2. Preparation

2.1 Installing the Batteries

Install the batteries first.

CAUTION

Select a relatively moisture-free location when installing batteries in the meter. When installing batteries, observe correct polarity (battery orientation). Failure to do so

may damage to the meter. Remove batteries from the meter if it is to be stored for an extended period of time. Do not leave dead batteries in the meter. They may leak and cause meter failure or

erratic operation of the meter. When replacing batteries, replace both batteries at the same time. If only one battery is

replaced, the new battery may discharge into the old battery, which may leak chemicals and damage the meter.

If the battery box gasket is damaged or dirty then the unit may no longer be waterproof; replace the gasket in this case.

(1) Loosen the screw holding the battery

box cover using a coin or similar object.

(2) Remove the battery box cover, and

then install the batteries observing polarity diagram inside.

(3) Make sure the gasket on the inside

458 or more

Batteries

Gasket

Press with your fingers

rim of the battery box is free of foreign material.

(4) Put the cover back on. Insert the tabs

on the top of the cover into the slots at an angle of at least 458 and lower the cover into position.

(5) Press the both ends of the cover down

with your fingers and tighten the screw to fix the cover onto the unit using a coin or similar object.

Note: Do not attempt to tighten further

when you feel resistance before the cover is fastened in place. Loosen the screw once and retighten.

2. Preparation

F020101.eps

IM 12D03D02-01E

2-1

2. Preparation

2.2 Connecting Sensor Cable

Connect the sensor cable as shown below.

CAUTION

Select a relatively moisture-free location when connecting the sensor cable. When connecting the sensor cable, tighten by turning only the silver locknut, do not turn

the cable or waterproof cover. Also take care not wet or contaminate the connector. Model SC82 sensors can be connected, but these are not guaranteed to be waterproof

when used with this meter.

(1) Pull the waterproof cover along the

sensor cable away from the connector to expose the locknut.

(2) Connect the connector to the meter

body*. Then tighten firmly by turning only the locknut.

* Align the slots of the sensor cable

connector with the posts of the connector on the meter.

(3) Move the waterproof cover toward

the connector until it contacts with the O-ring* on the meter body.

* Make sure that the O-ring is free of

foreign material.

(4) Push and rotate the waterproof cover

1/4 turn (90 degrees) clockwise to lock into place.

(2)

Waterproof cover

O-ring

(3)

Locknut (Silver)

(1)

(4)

F020201.eps

Caution: It is recommended that, as far as possible, you leave the sensor connected to the

meter to help ensure that the connector does not get dirty.

2-2

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2.3 Setting Date and Time

After installing the batteries, set the date and time. Note that if the power is turned off before setting “minutes,” start with the date setting when you turn on the power next time.

If you replace the batteries, the date is not affected, but the time is reset. Reenter the time.

Caution: If the sensor is not connected then an error will be displayed on the meter.

• Setting method

After installing batteries, press and hold the all display elements turn on and the date setting display automatically appears. Set year,

month, day, hours, and minutes as follows: Caution: If you stop part way through the date and time setting then the meter will beep

and the date and time will not be updated.

After

POWER

pressing

key for at least 1 sec.

POWER

key for at least one second. Then

2. Preparation

Year setting

After several seconds

F/ENT

to confirm

to set

Day setting Hour setting (24-hour format)

to set

F/ENT F/ENT

to confirm

to set

After several seconds

Month setting

to set

F/ENT

to confirm

Minute setting

to set

to confirm

F020301.EPS

IM 12D03D02-01E

2-3

2. Preparation

2.4 Setting Temperature Unit

Default temperature units are 8C. To change to 8F, refer to Sec. 4.3 (13) Set temperature units (tP.U) panel.

2.5 Setting Cell Constant

Even for sensors of the same type, each sensor has its own distinct cell constant. So, set the proper cell constant as indicated on the sensor cable.

Whenever sensors are replaced, be sure to change the cell constant setting in the meter accordingly. Cell constants once set are stored in non-volatile memory and are not lost even when the batteries are replaced.

• Setting cell constants

Press the

Refer to Sec. 4.3 (4).

F/ENT

key to switch to function mode. Then select the C.C display with the key and access the cell constant setting display with the key to set the cell constant, then press the

F/ENT

key to confirm it.

F/ENT

key. Use the

2-4

IM 12D03D02-01E

F/ENT

for Function mode

select C.C

for C.C panel

F/ENT

to enter C.C

F/ENT

2. Preparation

MEAS

You can abort this procedure at any time by pressing mode.

IM 12D03D02-01E

F020501.EPS

MEAS

to revert to measurement

2-5

2. Preparation

2.6 Setting Temperature Compensation Coefficient

As described in Section 7.3, liquid conductivity varies with liquid temperature. Therefore, if concentration is measured by conductivity, the conductivity must be converted to equivalent conductivity at a certain temperature. This instrument incorporates standard temperature conversion functions to convert liquid conductivity measurements to equivalent conductivity at 258C. To display equivalent liquid conductivity at 258C, set the temperature compensation coefficient as described in this section.

Temperature coefficient for NaCl solutions is stored in this instrument. If any other solution is used, set the temperature compensation coefficient manually.

Refer to Sec. 4.3 (2) Temperature compensation setting (t.Co) panel.

2-6

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• Set the temperature compensation coefficient

F/ENT

for Function mode

select t.Co

for t.Co panel

F/ENT

For NaCl solutions Manual setting

select NaCl or %/8C (%/8F)

2. Preparation

F/ENT

MEAS

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F/ENT

Set the temperature compensation coefficient with the keys.

F/ENT

MEAS

The temperature coefficient you set is displayed here

F020601.EPS

2-7

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