DIGITAL PH METER MANUAL

EH-2000

Digital pH MeterInstruction Manual

ATTENTION

Please note that misuse of this device may lead to injury
to the user or damage to the device.
Please observe all safety precautions and warnings inthis instruction manual.

Address:Thank you for purchasing our Digital pH meter.
Please read this instruction manual carefully before using
to ensure the correct usage of this device.
Please keep this instruction manual for future reference.
For safe usage of this device, please observe all statements regarding
precautions and warnings in this instruction manual.

Contact :E-mail :Web:

37-7 Chuo-cho, 2-ChomeMeguro-ku, Tokyo 152-0001 Japan
Please visit our company website for contact details
webtrade@line.co.jp
http://www.lineseiki.com

32HOLD pH

1

1. Measurement display
2. Data Hold
3. Low battery

1. Operation- Do not use this device near machines that emit strong electromagnetic
fields or objects that store static electricity.
- Do not drop or subject this device to strong impact.
- Do not use or store this device where it will be exposed to water or inplaces with wet conditions.
- Do not use or store this device where it can be exposed to direct sunlight,dust, high temperature and high humidity.
- Make sure to remove the pH electrode when changing the battery.
- See the battery case markings to ensure that the battery is properly installed.
- For accurate measurements, do not subject this device in measuring suddenchange of temperatures.
- Remove the battery when the device will not be used for a long period of time.
- Do not attempt to disassemble or modify this device.

2. pH electrode- Do not use the pH electrode degraded and damaged.
- Handle pH electrode with care since the tip of pH electrode is thin film glass.
- Do not use the pH electrode out of its measuring range. The quality of pH
electrode may be degraded by strong alkali and strong acid.
- Inspect the pH electrode before measuring.
- Always put the tip of electrode inside the preservation liquid if not in use.
- Do not drink the preservation liquid.
- The pH electrode is easy to damage.
- The life of pH electrode depends on the usage and measuring object.
- Exchange the pH electrode to new one periodically.
- The pH electrode is out of our standard warranty.

Side View

1)
2)
3)
4)
5)
6)
7)

Insert the Battery into the Battery Box.
(Refer to the section 6.Battery Replacement).
Connect the pH electrode to the socket on the device.
Press the [POWER] Button to switch-on the device.
Dip the pH electrode into the measured solution. The bubble
on the surface of electrode should be removed before measuring.
When the reading becomes stable, read the displaying value.
Press the [POWER/ESC] Button to switch-off the device.
After the measurement, rinse the electrode with distilled water,
wipe the water with filter paper and store the electrode inpreservation bottle.

3. Functions Operation (Data Hold)a. Data Hold1) During the measurement, press the [HOLD] button to hold the lastmeasured value on the display.The display will also show the"HOLD" symbol.
2) Press the [HOLD] button again to exit the Date Hold function.

1) Wipe off dust and other dirt from the main unit with a dry cloth.
2) Make sure to rinse the electrode with distrilled water after themeasurement.
3) Refill preservation bottle with preservation liquid (Model: EH-700,
sold separately) If preservation liquid is decreased.

Back View

1745

pH electrode（EH-801）

6. BNC Plug
7. Battery
compartment / Cover
8. Electrode Socket
9. pHe electrodepreserved liquidCaution

Please do not wipe with benzene or thinner.
It may cause cracks or discoloration to the surface ofthe main unit.

5. Storage
1) For proper storage, avoid places where the device can be
exposed to direct sunlight, high humidity, high temperature,vibration and shock, dust, rust, corrosion, etc. Remove batteries
and electrode if the device will not be used for a long period oftime.
2) Always put the tip of electrode inside the preservation liquid toavoid drying it.

6. Battery Replacement8

1. Display
2. [POWER] Button
3. [HOLD] Button
4. Calibration [PH7]5. Calibration [PH4]Make sure the device and pH electrode is calibrated before
measuring. (Refer to the section.8 Calibration Procedure.)

4. Cleaning

1. Functions

6Calibration [PH7]

Battery Cover Attachment

91) When theLow Battery indicator appears on the display, it isnecessary to replace the battery to maintain accurate readings.
2) Remove the battery cover as shown below.
3) Replace the battery with a new one and position the new battery
correctly inside the device’s battery compartment.
4) Attach the battery cover.
* The unit cannot measure accurately after low battery indicator isdisplayed. Please replace the battery immediately.

Calibration [PH4]Side View

c.Two Points Calibration* Do not damage the leadwire when attaching the battery cover.

7. General Specifications
Main Unit

ATTENTION

Base View

Battery Insertion

LINE SEIKI CO., LTD.

2. Measuring Procedure

Safety Precautions

23

Battery Cover Removal

EH-2000

Customer ServiceEH-2000

Front View

DIGITAL PH METER MANUAL

ModelEH-2000

electrode method *1
Measuring Method glass(Combination Electrode) *2

Sampling Time

Approx. 0.4 second.

Functions

Data Hold

Display

LCD:44mm x 28mm Digit Size:15mm

Power Supply006P (DC9V) battery x 1 pc.

Battery Life

Approx. 240Hours.

Current Consumption Approx. 2.0mA
Operating Temp.

0 - 50°C

Operating humidity 80%RH max
Dimensions
weightContent
Compliance

Main Unit:135(H)x60(W)x33(D)mm
pHe electrode: 9.5mmx120mm Cable Length:Approx. 2m
WEIGHT:Approx. 196g (including batteries)
Instruction Manual, 006P battery x 1pc.
CE, RoHS*1 Glass ElectrodeThe measured pH of a solution is determined by the amount of voltage(electric potential) produced across two electrodes. These electrodes
are the glass electrode and the refer ence electrode.
*2 Combination ElectrodeThe combination electrode is a glass electrode and a referenceelectrode combined together to form a single electrode. The
combination electrode is more con venient to handle in processes suchas calibration, testing and washing.

Accuracy
Measuring Range

1)
2)
3)
4)
5)
6)
7)
8)
9)

Connect the pH electrode to the socket on the device.
Dip the pH electrode into the pH7.00 buffer solution.
Press the [POWER] Button to switch-on the device.
Adjust Calibration knob [PH7] with a precision screwdriver until thedisplay accurately shows the value of 7.00.
Rinse the pH electrode with distilled water.
Dip the pH electrode into the buffer pH4.00 solution.
Adjust Calibration knob [PH4] with a precision screwdriver until thedisplay accurately shows the value of 4.00.
Repeat above 1) to 7) procedures twice at least.
After the calibration, rinse the electrode with distilled water and wipe
the water with filter paper.

d.Single Points Calibration
1)
2)
3)
4)

Connect the pH electrode to the socket on the device.
Dip the pH electrode into the pH7.00 buffer solution.
Press the [POWER] Button to switch-on the device.
Adjust Calibration knob [PH7] with a precision screwdriver until thedisplay accurately shows the value of 7.00.
5) Rinse the pH electrode with distilled water and wipe the water withfilter paper.

e.Troubles during calibration
The pH electrode might have damaged in the following cases.
It should be exchanged to new one.
- The value on the display does not become stable after more than
15 minutes- The value on the display does not change when turning thecalibration knob.

9. Accessories (Sold Separately)- buffer PH 4.00 solution（40cc）: EH-804- buffer PH 7.00 solution（40cc）: EH-807- Replacement pH Electrode : EH-801- pH electrode preserved liquid（30cc）: EH-700

Main unit : pH 0.00 to pH 14.00
pH Electrode (EH-801) : pH 1.00 to pH 13.00

Resolution

pH 0.01

Accuracy

pH ±0.07(pH5.00 - 9.00)
pH ±0.1(pH4.00 - 4.99 ,pH9.01 - 10.00)
pH ±0.2(pH0 .00- 3.99 ,pH10.01 - 14.00)* Temperature Conditions : 23±5°
C environment testing.

8. Calibrating Procedurea.Calibrating Consideration
This pH meter is already calibrated from the mV output of an ideal
electrode (at 25°C environment).
However, (a) Knowing that ideal electrode produces zero volt atpH7.00, most electrodes will be slightly off.
(b) though the conditions of the environment may be at 25°C duringcalibration, measuring between 15 - 35°C may still be possible to do.
If the user wants to keep the electrode performing at high accuracy, it
is necessary to always follow the calibration procedures.

b.Equipment for Calibration- Main unit (EH-2000) and pH electrode (EH-801)- Two buffer solutions (sold separately) / pH7.00 (EH-807) & pH4.00 (EH-804)- Distilled water (Marketed product)- Slotted precision screwdriver
Pour the buffer solutions into different containers by the amountnecessary for calibration.
Do not return the buffer solutions which have used for calibration into
the bottle.

This manual was last revised Jul. 15, 2021. 4LU023D*Subject to change without prior notice.
All Rights Reserved,Copyright 2021,LINE SEIKI CO.,LTD.