HORIBA DS-51 Instruction Manual
For more information, please contact us:
ExpotechUSA
10700 Rockley Road
Houston, Texas 77099
USA
281-496-0900 [voice]
281-496-0400 [fax]
E-mail: sales@expotechusa.com
Website: www.ExpotechUSA.com
■ Preface
Thank you for purchasing the DS-51 conductivity meter.
This meter has a large-sized LCD display, which enables to use the
varied functions by simple operations, and especially will be
convenient to use in laboratory.
Carefully read this manual before using the meter.
Warranty and Responsibility
Your meter is covered by warranty for a period of one (1)
year , under normal use. Although unlikely, if any trouble attributable
to us should occur during this period, necessary exchange or
repairs shall be conducted by us, free of charge. The
warranty does not cover the following:
• Any trouble or damage attributable to actions or conditions
specifically mentioned to be avoided in the operation
manuals
• Any trouble or damage attributable to use of the meter in
ways or for purposes other than those described in the
operation manuals
• If any repairs renovations, disassembly, etc. are performed
on this meter by any party other than us or a party
authorized by us
• Any alteration to the external appearance of this meter
attributable to scratches, dirt, etc. occurring through normal
use
• Wear and tear to parts, the exchange of accessories, or the
use of any parts not specified by us
We also shall not be liable for any damages resulting from
any malfunctions of this product, any erasure of data, or any other
uses of this product.
■ CE Marking
This product is in conformity with the following directives and
standards:
Directives:The EMC Directives 89/336/EEC
Standards: EN61326: 1997+A1:1998
Installation Environment
This product is designed for the following environment.
- Pollution degree 2
Precautions for use
The Electrical Product Safety Directive 73/23/EEC
(EMISSION: Class B, IMMUNITY Category: Minimum
Requirement)
EN61010-1: 2001
- Measurement category Ⅰ
WARNING:Do Not use the equipment for measurements within
■ FCC Warning
This equipment has been tested and found to comply withthe limits for
a Class A digital device, pursuant to part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against
harmful interference when the equipment is operated in a commercial
environment. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio
communications.
Operation of this equipment in a residential area is likely to cause
harmful interference in which case the user will b e r e q ui r ed t o c o r r e c t
the interference at his own expense.
measurement categories
Ⅱ , Ⅲ and Ⅳ .
I
Precautions for use
■ Type and Definition of Signal Words
For the safety use, the meter is equipped with the Warning Labels to
alert every operator and user to the possible risk and danger. Before
using understanding each message.
The meaning of signal words are as follows:
(WARNING)
This indicates an potentially hazardous situation which,
if not avoided, will result in death or serious injury.
(CAUTION)
This indicates a potentially hazardous situation which, if
not avoided, may result in minor or moderate injury. It
may also be used to alert unsafe practices.
■ Safety Precautions
For the safety use, be sure to read the following precautions:
WARNING:
● Do not use any unspecified AC adapters.
Heat or fire may occur to cause fire or accidents.
● Do not disassemble or modify the meter.
Heat or fire may occur to cause fire or accidents.
CAUTION:
● Do not use the serial communication or AC adapter in the place that
may possibly contact with moisture.
It may cause fire, electric shock, or breakage.
● Part of the electrode is made of glass; handle with care not to break
it.
II
● Indication
Precautions for use
WARNING
This indicates an potentially hazardous situation which, if not avoided,
will result in death or serious injury.
CAUTION
This indicates a potentially hazardous situation which, if not avoided,
may result in minor or moderate injury. It may also be used to alert
unsafe practices.
This mark indicates the operation requires a special care and attention.
This mark indicates to which the reader should go for reference.
HINT!
This mark indicates reference information.
III
■ Cautionary Items
● Precautions
● Do not give physical shock to the meter like dropping or hitting.
● Avoid water or solution from being contact with the meter body.
Water or solution, if contacts with the meter, may cause the meter
breakage.
● To remove the dirt on the meter, wipe it off with dry and soft cloth as
silicone cloth. (Do not use water)
● Do not pour water to the electrode and/or the connector part of the
meter body. Do not touch with dirty or wet hands.
● The electrode and/or the connector part of the meter body requires
high insulation. Contact with water or with dirty hands may bring
defective insulation, to cause indication fluctuation or erroneous mea
surement values. Sometimes the electrode itself may be damaged to
an unrecoverable level.
● Perform the key operation by the fingers, not by the hard object like
metal stick or rod.
● To disconnect the electrode cable or interface cable, pull them out
with holding the connector part. Do not pull the cable part; it may
cause a breakage.
● Do not use any unspecified batteries ; it may cause a breakage.
Precautions for use
-
● Location of use and storage
● The place which room temperature is at 0 ℃ to 45 ℃
● The place which relative humidity is under 80% and free from condensation
Do not use or store the meter at;
● The place of much dust
● The place with strong vibration
● The place with direct sunlight
● The place with corrosive gas generation
● The place near from an air-conditioner
● The place with direct wind
● Move and Transportation of the meter
To transport the meter, use the packaging box at the delivery.
Transportation by any unspecified packing methods may cause a
breakage.
● Disposal
Standard solution used for the calibration must be under neutralization
before the disposal. As for the disposal of the meter, treat it as an
industrial waste.
IV
TABLE OF CONTENTS
Chapter 1 Overview of COND Meter . . . . . . 1
1.1 Package contents.......................................................... 1
1.2 Functions........................................................................ 2
1.3 Explanation of part names............................................ 4
1.3.1 Meter body ....................................................................................4
1.3.2 Display ...........................................................................................4
1.4 Operation keys............................................................... 6
1.5 Assembling the electrode stand .................................. 7
1.6 Connecting the electrodes............................................ 8
1.7 Inserting/replacing the dry-cell batteries .................... 10
1.8 Connecting the AC adapter .......................................... 11
Chapter 2 Taking Measurements . . . . . . . . . 13
2.1 Turning the meter ON/OFF............................................ 13
2.2 Settings required before measurement....................... 13
2.3 Measurement modes..................................................... 14
2.4 Selecting the measurement modes ............................. 15
2.5 Conductivity measurement........................................... 16
Chapter 3 Functions . . . . . . . . . . . . . . . . . . . 23
3.1 Data memory function................................................... 23
3.2 Displaying and setting the clock.................................. 25
3.3 Setting modes................................................................ 26
3.3.1 Entering the Setting mode .............................................................26
3.3.2 Temperature compensation setting ...............................................28
3.3.3 Conductivity unit setting .................................................................29
3.3.4 Temperature coefficient setting .....................................................29
3.3.5 Sample ID# setting ........................................................................30
3.3.6 Maintenance mode ........................................................................31
Chapter 4 RS-232C communications . . . . . 39
4.1 Cautions before use...................................................... 39
4.2 Command list................................................................. 40
4.3 On-line operation commands....................................... 42
4.4 Data request commands and responses..................... 46
4.5 Communication example using the Hyper Terminal.. 54
DS-51 V
TABLE OF CONTENTS
Chapter 5 Printer . . . . . . . . . . . . . . . . . . . . . . 57
5.1 Connecting the printer.................................................. 57
5.2 Printer setting ................................................................ 58
5.3 Printer output timing..................................................... 59
5.4 Printing format............................................................... 60
5.4.1 When the ENTER key is pressed in the Measurement mode ....... 60
5.4.2 When the manual data memory is performed
in the Measurement mode .............................................................61
5.4.3 When the ENTER key is pressed
in the Data Memory Call screen .................................................... 62
5.4.4 When calibration or check is performed in the Calibration mode .. 62
5.4.5 Test printing format in the Maintenance mode .............................. 62
Chapter 6 Maintenance and Troubleshooting 63
6.1 Conductivity electrode maintenance........................... 63
6.2 Troubleshooting ............................................................ 64
6.2.1 Error message chart ......................................................................64
6.2.2 More troubleshooting .....................................................................68
Chapter 7 Reference . . . . . . . . . . . . . . . . . . . 71
7.1 Conductivity measurement .......................................... 71
7.2 Specifications ................................................................ 77
7.3 Default settings.............................................................. 80
7.4 Operation flowcharts..................................................... 81
7.5 Pin layout of special cables.......................................... 82
7.5.1 RS-232C communications cable ................................................... 82
7.5.2 Cable for CITIZEN printer ..............................................................82
7.5.3 Cable for SEIKO printer .................................................................82
7.6 Spare and optional parts .............................................. 83
7.6.1 Optional parts ................................................................................ 84
VI HORIBA
Chapter 1 Overview of COND Meter
Chapter 1 Overview of COND Meter
This chapter explains the part names, how to connect the electrodes,
how to replace the batter
1.1 Package contents
The following items are shipped with each HORIBA COND meter.
Name Q’ty
Meter 1
ies, and precautions when using the meter.
1.1 Package contents
Stand 1
Dry-cell batteries 4
Operation manual 1
AC adapter 1
To take measurements, you will need electrode(s).
Refer to "7.6 Spare and optional parts" page 83 when purchasing the
electrode(s).
DS-51 1
Chapter 1 Overview of COND Meter
1.2 Functions
1.2 Functions
The COND meter features the following functions.
● Measurement items
Conductivity Conductivity electrode
Salinity
Resistivity
Items Required electrode/standard solution
Conductivity standard solution
● Functions
Temperature
An overview of the functions found on the COND meter is shown below.
Function Explanation
Data memory Enables a maximum of 300 items to be
Clock The date and time are displayed. page
Auto Power OFF Turns ON/OFF setting that automatically
RS-232C
communications
Printer output Prints the contents of the memory (printer
−
stored.
turns power OFF if no keys are touched for
30
minutes.
Enables communication with a computer,
using RS-232C.
sold separately).
Page
No.
page
23
25
page
35
page
39
page
57
Commercial
power supply
Enables the use of commercial power,
using an AC adapter.
page
57
● Setting Items
Chapter 1 Overview of COND Meter
1.2 Functions
Function Explanation
Sample ID ID No. of the sample page
Temperature
compensation
COND unit Toggles between S/m and S/cm. page
COND
temperature
coefficient
RS-232C communications and the printer cannot be used simultaneously.
● Functions in Maintenance mode
Enables temperature compensation to be
conducted in pH M
easurement mode,
either manually or using a temperature
sensor.
Automatically or manually sets a
temperature coefficient for a sample.
Page
No.
30
page
28
29
page
29
Name Explanation
LCD check Enables check for whether or not all LCD
Battery voltage
segments are displayed
Enables simple check of battery voltage. page
.
check
Temperature
Carries out temperature calibration. page
zero adjustment
Auto Power OFF Sets the function that automatically turns
the power OFF if no keys are touched 30
Page
No.
page
32
33
34
page
35
minutes.
Remaining data
memory
Data memory
clear
Initializing
settings
Displays the remaining memory. page
36
Deletes data in memory. page
36
Initializes all settings to the default values. page
37
Printing test Conducts a printing test. page
38
DS-51 3
Chapter 1 Overview of COND Meter
1.3 Explanation of part names
1.3 Explanation of part names
The COND meter has the following parts:
1.3.1 Meter body
AC connector
Serial communication
connector
CH1 measurement
electrode
Grounding
CH1 temperature
electrode
1.3.2 Display
Error No.,
エラーNo.
Data No.
データ No.
Year,
Status display
Status display
状態表示
Measurement data,
hour and minute
測定データ
Calibration history
Cursor for selecting
setting mode
Setting mode guide
設定モードガイド
校正履歴
設定モード
選択カーソル
Input channel Input channel 1
Input channel
入力 CH
年
時分
Part name Display Contents
Temperature,
温度、月日
month and day
HOLD
HOLD
Second
秒
Meter mode
装置モード
Measurement
測定単位
unit
Measurement
Conductivity Measurement mode
item
Error No. Displayed when an error is generated
Data No. Displayed when data number has been set.
Chapter 1 Overview of COND Meter
1.3 Explanation of part names
Part name Display Contents
Status display
−
−
−
Shows error number and data number.
Displayed when the serial communication is
active.
Displayed when temperature compensation
function or automatic temperature compensation
has been set.
Displayed during data memory function (for 3
sec.).
Displayed while data in memory is being called up
and when manual data memory is being called up.
Displayed when a printer is connected.
(
Sometimes displayed when a computer is
connected
depending on the computer.)
Displayed during manual temperature
compensation
.
Not displayed during automatic temperature
compensation
.
HOLD Displayed while the data is held (HOLD status).
Blinks during measurement or calibration.
Meter mode Displayed when in Measurement mode.
Displayed when in Calibration mode.
DS-51 5
Chapter 1 Overview of COND Meter
1.4 Operation keys
1.4 Operation keys
This section describes the functions of the keys.
Name Description
MEAS key Returns to the Measurement mode.
Starts measurement.
MODE key Selects measurement item.
SET key Selects setting item.
CELL key Enters the Cell Constant Setting
mode.
UP key Executes the data memory function.
Increases numerical values.
ENTER
Establishes the setting.
key
DOWN key Calls up data memory. Decreases
numerical values.
ON/OFF
key
Turns ON/OFF the power. This key
takes effect only af ter pressed for on e
second to prevent accidental
operation.
The automatic power-off function is a default setting for this CONDmeter. The
power is automatically turned OFF if no operation is performed
approximately 30 minutes.
after a period of
1.5 Assembling the electrode stand
1. Mount the electro de stand on the re ar of the meter as shown in the
figure below.
Chapter 1 Overview of COND Meter
1.5 Assembling the electrode stand
DS-51 7
Chapter 1 Overview of COND Meter
1.6 Connecting the electrodes
1.6 Connecting the electrodes
Connect the electrodes to the COND meter using the following
procedure
・ Do not allow any water to come into contact with the connector.
・ Do not touch the connector with uncleaned hands.
・ Hold the metal portion when turning the electrode connector.
:
CH1 measurement
electrode
CH1 temperature
electrode
● Electrode connector
1. Insert the electrode connector, making sure to align the connector
2. Push the electrode connector into the connector port while turning
grooves with the pins in the connector
Do not push the electrode connector with undue force when the
pins are not properly aligned.
CH1 measurement electrode
it clockwise, following the grooves
port on the main unit.
.
3. Push the connector cover over the connector, b ei ng c a r e f u l t o
push it straight on without turning it.
Connector cover
● Temperature connector
1. Insert the temperature connector into the jack on the main unit of
the
When the temperature electrode is not connected (or is connected improperly),
the automatic temperature compensation (ATC) will be 25°C .
Chapter 1 Overview of COND Meter
1.6 Connecting the electrodes
COND meter.
DS-51 9
Chapter 1 Overview of COND Meter
1.7 Inserting/replacing the dry-cell batteries
1.7 Inserting/replacing the dry-cell batteries
The dry-cell batteries are not placed in the COND meter before
shipping.
Note that if “ERR 2” appears on the display while using the COND
meter, it indicates that the charge of the dry-cell batteries is running low.
When this occurs, replace the batteries promptly.
Dry-cell battery type: AA alkaline
・Insert the battery, paying attention to the orientation of the battery poles (“+”
and “-“).
・Removing the batteries will erase the clock data. To save the clock data,
remove and replace the batter
adapter
・Replace the batteries only after turning the power OFF. Any saved data will
not
be lost.
・When opening and closing the battery cover, be careful that no water gets
inside the meter.
To insert the batteries, follow the procedure below.
ies while the meter is connected to the AC
.
Battery cover
電池カバー
Dry-cell
単 3 乾電池
battery
（4 本）
The life of batteries included with th e COND meter may be short because the
batteries were used for the operation check before shipping.
To insert/replace the batteries
1. Remove the battery cover on the bottom of the meter and set the
dry-cell batteries (4 pcs.) in the correct direction.
−
＋
＋
−
Battery life
The life of alkaline batteries during continuous use is approx. 200 hours.
The life of manganese batteries is approx. 100 hours.
10
1.8 Connecting the AC adapter
When using the meter with an AC power supply, use the designated AC
adapter
AC adapter specifications
Supply voltage range 100 - 200 V AC
Frequency range 50/60 Hz
Current rating Max 370 mA
Class2 Power supply
Equipment protected by
double insulation
Indoor use only
Supply voltage fluctua-
tions allowed up to ± 10%
.
Chapter 1 Overview of COND Meter
1.8 Connecting the AC adapter
1. Connect the connector of the AC adapter to AC adapter
connecting port on the side of the meter.
AC adapter connecting
AC adapter connecting
port connecting port
port
.
DS-51 11
Chapter 1 Overview of COND Meter
1.8 Connecting the AC adapter
12
Chapter 2 Taking Measurements
2.1 Turning the meter ON/OFF
Chapter 2 Taking Measurements
This chapter explains how to take basic measurements.
2.1 Turning the meter ON/OFF
Pressing the ON/OFF key turns the power on/off. The ON/OFF key
functions when it is pressed continuously for about one second to
protect against accidental operation.
2.2 Settings required before measurement
The built-in clock allows you to record the date of calibration and data
memory storage. When using the meter for the first time, be sure to set
this clock.
“3.2 Displaying and setting the clock”page 25
DS-51 13
Chapter 2 Taking Measurements
2.3 Measurement modes
2.3 Measurement modes
The meters have an Instantaneous Value Measurement mode and an
Auto Hold Measurement
measured.
● Instantaneous Value Measurement mode
Instantaneous Value Measurement mode continuously displays the
measurements, as they take place. The meters perform instantaneous
value measurement as the default measurement mode when the power
is first turned ON and when the auto hold measurement is cancelled or
cleared.
mode for all components of the solution being
● Auto Hold Measurement mode
Auto Hold Measurement mode maintains the display of the value
measured when the meter automatically judges that the measured value
has stabilized. Press the MEAS key when in the Instantaneous Value
Measurement mode to make
measured value becomes stable,
displayed, and the measured value will remain displayed. To clear the
hold status or
MEAS key.
"stabilized" value (when "HOLD" is blinking), press the
Blinks
Displayed
"HOLD" blink on the display. When the
"HOLD" will stop blinking and remains
Displayed
Criteria for judging stability
Conductivity measurement
Temperature measurement
Within ±3-digit variance after 10
：
seconds
Within ±2ºC variance after 10
：
seconds
14
2.4 Selecting the measurement modes
Pressing the MODE key changes the measurement mode. The last
measurement mode item is the clock display. Pressing the MODE key
once more returns the display to the first measurement mode.
Power ON
COND Measurement mode (instantaneous value)
Salinity Measurement mode (instantaneous value)
Resistivity Measurement mode (instantaneous value)
Chapter 2 Taking Measurements
2.4 Selecting the measurement modes
Clock display
DS-51 15
Chapter 2 Taking Measurements
2.5 Conductivity measurement
2.5 Conductivity measurement
The following shows the operational flow for conductivity measurement
● Measuring conductivity: basic operational flow
1. Electrode preparation
Power ON
2.
Conductivity Measurement mode (instantaneous value)
“ ● Setting the clock” page 25
“3.3.3 Conductivity unit setting”page 29
“3.3.4 Temperature coefficient setting”page 29
3. Cell constant setting
4. Calibration mode
Preparation for standard solution
Auto Hold calibration
Conductivity Measurement mode (instantaneous value)
5.
“3.3.5 Sample ID# setting”page 30
6.
Auto Hold Measurement (instantaneous value)
“3.1 Data memory function”page 23
About once
a year
Clear Hold
16
● Electrode preparation
Refer to the electrode instruction manual and make sure you have the
correct electrode.
● Entering the Conductivity Measurement mode
1. Remove the electrode protective cap from the electrode.
2. Immerse the electrode in pure (de-ionized) water.
3. Turn the power ON.
The Conductivity Instantaneous Value Measurement screen will
appear.
Chapter 2 Taking Measurements
2.5 Conductivity measurement
DS-51 17
Chapter 2 Taking Measurements
2.5 Conductivity measurement
● CELL SET mode (Setting cell constant)
Set the cell constant the first time an electrode is connected to the main
unit of the meter.
1. To enter the CELL SET mode, press the CAL key while in the
Measurement mode.
2. Change the digit number using the ENTER key.
Digit
3. Press the ▲ and ▼ keys to set the cell constant written on the
electrode label.
Setting range: 0.700 – 1.300
To change the coefficient, use the following procedure.
When the SI unit system (m-1) is set:
When the former unit system (cm-1) is set:
Temperature coefficient
The default value of the temperature coefficient is set at 2.00%/ºC.
To change this setting, refer to “3.3.4 Temperature coefficient
setting”page 29.
Unit Setting
The default value of unit is S/m (SI unit system).
To change this setting to the former unit system S/cm, refer to
「3.3.3 Conductivity unit setting」P.29.
18
● Calibrating the cell constant
The cell constant of the electrode changes as the electrode is used. Cal-
ibrate the cell constant once a year or so.
Calibrating the cell constant will update it to match the condition of the
current electrode.
The cell constant is calibrated with a standard solution of potassium chloride.
To prepare a standard solution of potassium chloride, refer to “ ● Preparing
potassium chloride standard solution” page 71.
1. Immerse the electrode in the standard solution of potassium
chloride.
2. Enter the Calibration mode by pressing the MODE key in the
CELL SET mode.
Chapter 2 Taking Measurements
2.5 Conductivity measurement
3. Enter the value of the standard solution used for calibration in the
Calibration mode using the ▲ and ▼ key.
“ ● Conductivity and temperature coefficient for various solutions” page
75
When the temperature conversion has been set to ON when setting the
temperature coefficient, calibration is performed with the converted
temperature.
4. Start the calibration by pressing the CELL key.
HOLD is displayed and the calibration is completed.
To redo the calibration, press the CELL key once more.
5. Press the MEAS key to enter the Measurement mode.
If any calibration error occurs, take it as a indication that the electrode has gone
bad. Replace the old electrode with a new one.
DS-51 19
Chapter 2 Taking Measurements
2.5 Conductivity measurement
● Measuring conductivity
1. Immerse the electrode in the sample.
Conductivity is greatly affected by temperature.
To measure with increased accuracy, use a temperature bath to keep the
solutions at a constant temperature.
2. Press the MEAS key while the Instantaneous Va lue Measurement
screen is displayed.
The measured value will be displayed, and “HOLD” will blink until
the reading stabilizes. When the measured value stabilizes,
“HOLD” will stop blinking and the measured value will remain
displayed, and measurement will be completed.
Refer to the “ Criteria for judging stability” page 14 for the criteria for
judging the stability of the readout.
When the COND meter is in the Instantaneous Value Measurement mode or
the measurement value is on
can store the measurement data to memory by pressing the ▲ key.
Data memory function”page 23
HOLD in the Auto Hold Measurement mode, you
See“3.1
20
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