Yokogawa SC72 User Manual

User’s

Manual

Model SC72

Personal Conductivity Meter

IM 12D03D02-01E

IM 12D03D02-01E

3rd Edition

Preface

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.

WARNING : Indicates that serious injury may result, if users fail to follow instruction manual procedures.

CAUTION : 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 Yokogawaauthorized engineers.

IM 12D03D02-01E
3rd Edition: Aug. 2009 (YK)
All Rights Reserved, Copyright © 2004, Yokogawa Electric Corporation	1

Preface

Liquid crystal display (LCD) display characters

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

Alphabet Display	Alphabet	Display Numerals	Display
A	N	0
B	O	1
C	P	2
D	Q	3
E	R	4
F	S	5
G	T	6
H	U	7	All display elements shown ON
I	V	8
J	W	9

KX

LY

M

Z

F00.EPS

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)

Flashing state:

Lit state:

2	IM 12D03D02-01E

Preface

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.

IM 12D03D02-01E	3

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

4	IM 12D03D02-01E

1. Outline

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 resistant 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.

IM 12D03D02-01E	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*1
• 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*1
• 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*1
• 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*1

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

	water)
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)

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

1-2	IM 12D03D02-01E

			1. Outline
EMC Compliance:
EMI (Emission): EN 61326-1 Class B
	Test Item	Frequency Range	Basic Standard
	Electromagnetic radiation disturbance	30 to 1000 MHz	CISPR 16-1 and 16-2

T0101.EPS

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

	No.	Test Item	Test Specification	Basic Standard	Performance
					Criteria*
	1	Electrostatic	4 kV (contact)	IEC 61000-4-2	A
		discharge	8 kV (air)
			80 to 1000 MHz,
			10 V/m (unmodulated)		B**
			80% AM (1 kHz)
		RF amplitude
	2		1.4 to 2.0 GHz,
		modulated	10 V/m (unmodulated)	IEC 61000-4-3	A
		electromagnetic field	80% AM (1 kHz)
			2.0 to 4.0 GHz,
			3 V/m (unmodulated)		A
			80% AM (1 kHz)

*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.

T0102.EPS

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.

IM 12D03D02-01E	1-3

1. Outline

1.4 Contents of Model SC72 Personal Conductivity Meter

Package

	3	Quick Manual
User©s		Instrument Card
Manual
		6
1		5
	2	4

SC72 - - - AA

7	8	9
			10
11	11	11	11

SC72 - 11 - - AA *1	SC72 - 21 -	- AA *1 SC72 - 31 - - AA *1	SC72 - 41 - - AA *1
	SC72 - 23 -	- AA

Model		Suffix code			Specification
SC72					Personal conductivity meter
Sensors		-00			Meter only, without sensor
		-11			With sensor for high purity water measurement
					(cable length: 0.75m)
		-21			With general-purpose sensor
					(cable length: 0.75m)
		-23			With general-purpose sensor (cable length: 3m)
		-31			With chemical-resistant sensor
					(cable length: 0.75m)
		-41			With sensor for high-conductiivity measurement
					(cable length: 0.75m)
Label			-J		Japanese
language			-E		English
-				-AA	Always -AA

No.	Name
1	Personal conductivity meter
2	Two dry batteries
3	Two instruction manual
4	Non-slip pads (two)
5	Hand strap
6	Instrument card
7	Sensor for high purity water
	measurement
8	General-purpose sensor
9	Chemical-resistant sensor
10	Sensor for high-conductivity
	measurement
11	Sensor cleaner
	(five cotton swabs)

*1 The meter model number and cell constants, as well as the sensor model no. (SC72SN-u-AA), are
shown on the nameplate.	F010401.EPS

1-4	IM 12D03D02-01E

1. Outline

1.5 Component Names and Functions

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 SC72

STYLE S1.0

No. E000001

2004.

Battery box cover fixing screw

Instrument name plate with model number and serial number

F010501.EPS

IM 12D03D02-01E	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		Cell constants
MODEL		SC72SN	CELL
			CONST
SUFFIX		-11-AA	NO.	000001	STYLE	S1.0
			Made in Japan
SC72SN Conductivity sensors for personal conductivity meter
Model Suffix code	Specification						Remarks*1
SC72SN	Conductivity sensor for personal conductivity meter
-11	For SC72; for high purity water measurement (cable
	length: 0.75m)
-19	For SC82; for high purity water measurement (cable						K9221XB
	length: 0.75m) *2
-21	For SC72; for general purpose type (cable length: 0.75m)
-23	For SC72; for general purpose type (cable length: 3m)
-29						*2	K9221XA
	For SC82; for general purpose type (cable length: 0.75m)
-31	For SC72; for chemical-resistant type (cable length:
	0.75m)
-39	For SC82; for chemical-resistant type (cable length:						K9221XC
	0.75m) *2
-41	For SC72; for high conductivity measurement (cable
	length: 0.75m)
-49	For SC82; for high conductivity measurement (cable						K9221XD
	length: 0.75m) *2
-AA	Always -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.

F010601.EPS

1-6	IM 12D03D02-01E

1. Outline

Sensor for high purity water measurement

General-purpose sensor

SC72 - 11 - - AA *1

Model number and cell constants display plate

(SC72SN-11-AA) *1

Watertight cover

Prevents moisture from entering connector and causing leakage between pins.

	Connector	Sensor
	Connects sensor cable to	cable
	conductivity meter
	Outer electrode
	connection	Sensor grip
	(SUS316
	stainless seel)
	Inner electrode	Sensor body
		Plastic body can
	(SUS316
	stainless seel)	withstand temperatures
		up to 808C.
		Outer electrode
		(SUS316 stainless seel)

SC72 - 21 - - AA *1

SC72 - 23 - - AA

Model number and cell constants display plate

(SC72SN-21-AA,*1

SC72SN-23-AA)

Watertight

cover

Connector

Sensor cable

Sensor body

Sensor grip

Inner electrode (Titanium)

Edge electrode (Titanium)

Cover (Plastic)

F010602.EPS

	Chemical-resistant sensor	Sensor for high-conductivity measurement
	SC72 - 31 - - AA *1	SC72 - 41 - - AA	*1
Model number and		Model number and
cell constants display plate		cell constants display plate
(SC72SN-31-AA) *1		(SC72SN-41-AA) *1
Watertight		Watertight
		cover
cover
	Sensor
	cable	Connector
Connector			Sensor cable
	Sensor grip	Air vent	Sensor grip
	Sensor body (glass)	Sensor body (glass)
Air vent
		Inner electrode
	Inner electrode	(platinum black)
	(platinum black)
*1 SC72SN-u will be described on sensor©s name plateorf the model number.			F010603.EPS

IM 12D03D02-01E	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	Soft case	Sensor stand
(Part no.: K9221ZA)	(Part no.: B9269KJ)	(Part no.: K9220XN)
	Unit: mm

Approx. 280

Appro	x. 1	40

	0
	3
.
x
ppro
A

0.1mol/l NaCl solution for	This soft black carrying case holds
calibration (250ml)	conductivity meter and sensor.

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

F010701.EPS

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)

Two battery box gaskets

Two sensor connection O-rings

F010801.EPS

1-8	IM 12D03D02-01E

2. Preparation

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.

458 or more

Batteries

Gasket

Press with your fingers

(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 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.

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.

Locknut

(2)(Silver)

(1)

(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

Waterproof cover

connector on the meter.

O-ring

(4)

(3)

(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.

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	IM 12D03D02-01E

2. Preparation

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 POWER key for at least one second. Then

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

key for at least 1 sec.

pressing

Year setting

to set

Month setting

After

F/ENT

several

seconds

to confirm

to set

F/ENT

to confirm

Minute setting

Day setting

Hour setting (24-hour format)

to set

to set

F/ENT

F/ENT

to confirm

to confirm

to set

F/ENT

to confirm

After	or
several
seconds

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 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 F/ENT key. Use the

key to set the cell constant, then press the F/ENT key to confirm it.

Refer to Sec. 4.3 (4).

2-4	IM 12D03D02-01E

2. Preparation

F/ENT

for Function mode

select C.C

F/ENT for C.C panel

to enter C.C

F/ENT

MEAS

F020501.EPS

You can abort this procedure at any time by pressing MEAS to revert to measurement

mode.

IM 12D03D02-01E	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	IM 12D03D02-01E

• Set the temperature compensation coefficient

F/ENT

for Function mode

select t.Co

F/ENT for t.Co panel

For NaCl solutions

Manual setting

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

F/ENT

F/ENT

F/ENT

2. Preparation

Set the temperature compensation coefficient with the keys.

MEAS

MEAS

The temperature coefficient you set is displayed here

F020601.EPS

IM 12D03D02-01E	2-7