How it Works
Horiba
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D51
Instruction Manual
90 pgs2.33 Mb0
Table of contents
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Horiba D51 Instruction Manual

Preface

Thank you for purchasing the D-51 pH meter . This meter is designed with a compact body that can be held in one hand and features a water-resistant construction Note 1. It has a large-sized LCD display, which enables to use the varied functions by simple operations, and especially will be convenient to use on-location. Carefully read this manual before using the meter.
IP-67 standards
・ Dust does not get into internal parts. ・ Water does not flow into internal parts when the meter is submerged 1 m
below the surface between the water and the device of 5 ℃ or less.
of the water for 30 minutes, at a temperature differential

HORIBA's Warranty and Responsibility

Your meter is covered by HORIBA's warranty for a period of one (1) year, under normal use. Although unlikely, if any trouble attributable to HO RIBA should occur during this period, necessary exchange or repairs shall be conducted by HORIBA, free of charge. The warranty does not cover t he 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, disas se mb ly, etc. ar e pe rf or me d o n th is me te r b y any party other than HORIBA or a party authorized by HORIBA
・ Any alteration to the external appearance of this pH 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 HORIBA
HORIBA 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.

Unauthorized reprinting or copying of this operation manual

No unauthorized reprinting or copying of all or part of this operation manual is allowed. The utmost care has been used in the preparation of this operation manual. If, however, you have any questions or notice any errors, please contact the HORIBA customer service center printed on the back cover of this operation manual.
Copyright © HORIBA, Ltd. 2003

■ CE Marking

This product is in conformity with the following directives and standards:
Directives:The EMC Directives 89/336/EEC The Electrical Product Safety Directive 73/23/EEC
Standards: EN61326: 1997+A1:1998 (EMISSION: Class B, IMMUNITY Category: Minimum Require-
ment) EN61010-1: 2001
Installation Environment
This product is designed for the following environment.
- Pollution degree 2
- Measurement category Ⅰ

Precautions for use

WARNING:Do Not use the equipment for measurements within measurement categories
Ⅱ , Ⅲ and Ⅳ .

■ 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 be required to correct the interference at his own expense.
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.
●Do not immerse the meter into alcohol, organic solvent, strong
acid, strong alkaline, and other similar solutions. The meter contains ABS resin, acrylic resin, and various rubber products in its body
●Do not use a hair-dryer for drying the meter. When the meter is
dropped into water or get wet, wipe it using soft cloth.
●Perform the key operation by the fingers, not by the hard object like
metal stick or rod.
●Be careful not to let water into the meter when the electrode connector
is empty or the AC adapter or serial communications cable has been connected. In those states, the meter is not water-proof
●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 remove the battery gasket or twist it.
●When opening the battery case, make sure that no foreign matter is
attached to the battery gasket.
●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

CONTENTS

1 Overview of the Meter . . . . . . . . . . . . . . . . . . . . 1
1.1 Package contents........................................................................... 1
1.2 Functions......................................................................................... 3
1.3 Part names ...................................................................................... 5
1.4 Explanation of display.................................................................... 6
1.5 Operation keys................................................................................ 8
1.6 Connecting the electrodes............................................................. 9
1.7 Inserting/replacing the dry-cell batteries ..................................... 11
1.8 Connecting the AC adapter ........................................................... 13
2 Taking Measurements . . . . . . . . . . . . . . . . . . . . 15
2.1 Turning the meter ON/OFF............................................................. 15
2.2 Settings required before measurement........................................ 15
2.3 Measurement modes...................................................................... 16
2.4 Selecting the measurement modes .............................................. 18
2.5 Measuring pH.................................................................................. 19
3 Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3.1 Data memory function.................................................................... 29
3.2 pH calibration history display ....................................................... 32
3.3 Displaying and setting the clock................................................... 34
3.4 Setting modes................................................................................. 36
3.4.1 Entering the Setting mode ............................................................ 36
3.4.2 Display and description ................................................................ 37
3.4.3 pH standard solution setting ......................................................... 37
3.4.4 Temperature compensation setting .............................................. 41
3.4.5 Maintenance mode ....................................................................... 42
4 Maintenance and Troubleshooting . . . . . . . . . . 51
4.1 pH electrode maintenance............................................................ 51
4.2 Troubleshooting ............................................................................. 55
4.2.1 Error message chart ..................................................................... 55
4.2.2 More troubleshooting .................................................................... 62
V
CONTENTS
5 Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
5.1 pH measurement............................................................................. 70
5.2 Specifications ................................................................................. 76
5.3 Default settings............................................................................... 77
5.4 Operation flowcharts...................................................................... 78
5.5 Spare and optional parts.............................................................. 79
5.5.1 Spare parts list ........................................................................... 79
5.5.2 Options ......................................................................................... 81
VI HORIBA
1 Overview of the Meter
This chapter explains the part names, how to connect the electrodes, how to replace the batter precautions when using the meter.
1.1 Package contents

1 Overview of the Meter

1.1 Package contents

ies, and
The following items are shipped with each HORIBA pH meter package.
Meter (main unit) 1 unit
Dry-cell batteries 2 pcs.
Strap 1 pc
D-51 1
1 Overview of the Meter
1.1 Package contents
Soft case 1 pc
Operation manual 1 book
To take measurements, you will need electrode(s). Refer to “5.5 Spare and optional parts” page 79 when purchasing the electrode(s).
2HORIBA
1.2 Functions
The D-51 features the following functions.
● Measurement items
1 Overview of the Meter

1.2 Functions

Items
pH pH electrode,
Temperature
Required electrode/
standard solution
pH standard solution
−
● Functions
An overview of the functions found on HORIBA the D-51 is shown below.
Function Explanation
Data memory Stores the data of measured values and
temperature to the memory (max. 300 items)
Page
No.
page 29
pH repeatability check
pH calibration history display
Clock Displays the time on the screen and
Auto Power OFF
AC adapter connection
Displays the difference between the calibration value and measured value after calibration.
Displays the date of calibration and the asymmetrical potential and sensitivity.
recorded data. Automatically turns off power if no operation
is made The meter can be AC-powered. page
after 30 minutes.
page 26
page 32
page 29
page 47
13
D-51 3
1 Overview of the Meter
1.2 Functions
● Setting Items
Function Explanation
pH standard solution setting
Temperature compensation
Enables standard solution used for calibration to be changed to N specification
s settings.
Toggles between Automatic Temperature Compensation (ATC) mode that measures the sample temperature using the temperature sensor built-in the electrode and Manual Temperature Compensation (MTC) mode that uses user-specified temperature.
● Functions in Maintenance mode
Function Explanation
IST and US
Page
No.
page 37
page 41
Page
No.
LCD check Enables check for whether or not all LCD
.
Battery voltage
segments are displayed Enables simple check of battery voltage. page
check Temperature
display
Adjusts the display of the temperature sensor to the actual temperature.
calibration Auto Power OFF Sets the function that automatically turns the
power OFF if no keys are touched 30 minutes.
Remaining data
Displays the remaining memory. page
memory Data memory
Deletes data in memory. page
clear Initializing
Initializes all settings to the default values. page
settings
page 44
45 page
46
page 47
48
48
49
4HORIBA
1.3 Part names
The D-51, pH meter has the following parts:
Display
Portion for attaching strap
1 Overview of the Meter

1.3 Part names

Keys
AC connector
Dry-cell battery holder
Temperature connector
Electrode connector
D-51 5
1 Overview of the Meter

1.4 Explanation of display

1.4 Explanation of display
Input channel
Error No., Data No. Year,
Status display
Measurement data, hour and minute
Calibration history
Part name Display Contents
Input channel Measurement
Measurement item
Temperature, month and day
HOLD
Electrode status
Second
Meter mode
Measurement unit
Cursor for selecting setting modes
Setting modes differ according to model
Input channel 1
item
Displayed when measuring pH
Error No. Displayed when an error is
generated
Data No. Displayed when the data number
has been set.
Status display
−
Shows error number and data number.
−
−
Displayed when temperature compensation function or automatic temperature compensation has been set.
6HORIBA
1 Overview of the Meter
1.4 Explanation of display
Part name Display Contents
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, or blinks when automatic data memory is being called up.
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.
Electrode status (Only in pH Measurement mode)
Not displayed: Normal Blinking: Cleaning is needed.
Constant display: Replacement
time is approaching.
Calibration history
Calibration history display: Displayed after calibration for pH and ION electrodes as calibration history.
When no calibration data is available
: Displayed when no calibration has been performed for pH and ION electrodes.
Meter mode Displayed when in Measurement
mode
.
Displayed when in Calibration mode
.
D-51 7
1 Overview of the Meter

1.5 Operation keys

1.5 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.
CAL key Enters the Calibration mode.
Starts calibration.
UP key Executes the data memory
function. value
ENTER key Establishes the setting. DOWN key Calls up data memory.
Decreases numerical value.
CAL DATA key
ON/OFF key
The automatic power-off function is a default setting for this meter. The power is automatically turned OFF if no
Calls up calibration data.
Turns ON/OFF the power. This key takes effect only after pressed for one second to prevent accidental operation.
Increases numerical
.
operation is performed 30 minutes.
after a period of approximately
8HORIBA
1.6 Connecting the electrodes
Connect the electrodes to the 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
conenctor
The following connectors are used depending on electrode
:
.
type:
1 Overview of the Meter

1.6 Connecting the electrodes

CH1 Electrode
connector: Temperature
connector:
pH electrode
Temperature electrode for CH1
● Electrode connector (G-R electrode)
pH electrode
CH1
O-ring
1. Insert the electrode connector, making sure to
align the connector grooves with the pins in the connector port on the main unit (see photo, ① ).
Do not push the electrode with undue force when the pins are not properly aligned.
D-51 9
1 Overview of the Meter
1.6 Connecting the electrodes
2. Push the electrode connector into the connector
port while turning it clockwise, following the grooves (see photo, ① and ② ).
3. Push the connector cover over the connector
(see photo, ③ ), being careful to push it straight on without turning it.
The meter will be waterproof only if this cover is placed properly over the connector.
● Temperature connector
1. Insert the temperature connector into the jack on
the main unit until the O-ring on the electrode cannot be seen at all (see photo, ④ ).
The meter will not be waterproof if the electrode is not inserted properly.
When the temperature electrode is not connected (or is connected improperly), the automatic temperature compensation (ATC) will be 25°C.
10 HORIBA
1 Overview of the 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 meter before shipping. To insert the batteries, follow the procedure below Note that if “ERR 2” appears on the display while using the meter, teries is running low. When this occurs, replace the bat- teries promptly. Dry-cell battery type: AA alkaline
・Insert the batteries, paying attention to the orientation
.
it indicates that the charge of the dry-cell bat-
of the battery poles (+ and -).
・Removing the batteries will erase the clock data. To
save the clock data, remove and replace the batteries while the meter is connected to the AC adapter separately)
・Replace the batteries only after turning the power OFF.
Any saved data will not be lost.
・When opening and closing the battery cover, be care-
ful that no water gets inside the meter.
・Check that the rubber packing is not twisted and no
foreign matter is stuck to it. Otherwise the meter may no longer be waterproof.
The life of the batteries included with the meter may be short because the batter check before shipping.
.
ies were used for the operation
(sold
To insert/replace the batteries
1. Loosen the screw of the battery cover by using a
coin or screwdriver, etc. The cover is constructed so that the stop screw cannot be completely removed and lost.
2. Pull up the screw, and remove the battery cover
by sliding it out.
D-51 11
1 Overview of the Meter
1.7 Inserting/replacing the dry-cell batteries
3. If there are old batteries inside, remove them.
4. Place the new batteries in the meter, verifying
the orientation of the poles (“+” and “-”).
5. Check that the rubber packing is not twisted and
no foreign matter is stuck to it.
6. Insert the edge of the battery cover into the
grooves on the meter, and then tighten the stop screw.
Edge
Tighten
Grooves
Main unit
Stop screw
Battery cover
Batteries
Rubber packing
Check that the rubber packing is twisted and no foreign matter is stuck to it. Otherwise the meter may no longer be waterproof.
Battery life
The table below shows the battery life of alkaline batteries
during continuous use. The life of manganese
batteries is about a half of the alkaline batteries.
Battery life approx. 200 hours
12 HORIBA
1.8 Connecting the AC adapter
When using the meter with an AC power supply, use the designated AC adapter (option).
AC adapter specifications
Supply voltage range 100 - 200 V AC Frequency range 50/60 Hz Current rating Max 370 mA Class2 Power supply Equipment pro-
tected by double insulation
1 Overview of the Meter

1.8 Connecting the AC adapter

Indoor use only Supply voltage fluc-
tuations allowed up to
± 10%
.
AC adapter connector
When the AC adapter is connected, the meter is no longer
waterproof.
Be careful not to let water get into the meter.
D-51 13
1 Overview of the Meter
1.8 Connecting the AC adapter
14 HORIBA
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

2 Taking Measurements

2.1 Turning the meter ON/OFF

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.
“3.3 Displaying and setting the clock” page 34
D-51 15
2 Taking Measurements

2.3 Measurement modes

2.3 Measurement modes
The D-51, pH meter has an Instantaneous Value Measurement mode and an Auto Hold Measurement mode for all components of the solution being measured.
● Instantaneous Value Measurement mode
The D-51, pH meter performs instantaneous value measurement as the default measurement mode when the power is first turned ON and when measurement is cancelled or cleared. For this reason, the screen displayed when the meter is in the Instantaneous the "initial screen" in this manual.
Value Measurement mode is called
the auto hold
Displayed
16 HORIBA
● 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
2 Taking Measurements
2.3 Measurement modes
MEAS key with the initial screeen
displayed to make
HOLD blink on the display. When the measured value
becomes stable, HOLD will stop blinking and remain displayed, and the measured value will remain
displayed. To clear the hold status or stabilized value (when HOLD is blinking), press the MEAS key.
Blinks
Displayed
Criteria for judging stability
pH, ORP, ION measurement
Temperature measuremen
t
Within ±1 mV variance in potential
：
after 10 seconds Within ±2ºC variance after 10
：
seconds
D-51 17
2 Taking Measurements

2.4 Selecting the measurement modes

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
pH Measurement mode (instantaneous value)
Clock display
18 HORIBA
2.5 Measuring pH
The following shows the operational flow for pH measurement.
● Measuring pH: basic operational flow
1. Electrode preparation Power ON
2.
pH Measurement mode screen (instantaneous value)
“ ● Setting the clock” page 35
2 Taking Measurements

2.5 Measuring pH

3. Standard solution calibration
Preparation for standard solution
“3.4.3 pH standard solution setting” page 37
4. Auto Hold Calibration
“ ● pH repeatability check” page 26 “ ● pH calibration history” page 32
5.
pH Measurement mode screen (instantaneous value)
“3.4.4 Temperature compensation setting” page 41
Clear HOLD
6. Auto Hold Measurement
“3.1 Data memory function” page 29
D-51 19
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