LINE SEIKI

DIGITAL PH METER
INSTRUCTION MANUAL

EH-1000

We thank you for purchasing our company’s pH meter.
This product, the digital pH meter is widely used in applications such asaquarium, beverages, fish hatchery, food processing, photography, laboratory,
quality control, schools and colleges, swimming pools and water conditioning.
We ask you to carefully read and understand this manual before using toguide you on how to gain the outmost benefits of all its function and uses.
Please keep this manual for future reference.

LINE SEIKI CO., LTD.

SAFETY INDICATION
Please strictly observe the safety instructions during the use of this product.
Read the precautionary instructions written next to the symbol indicating thecaution mark of this manual.

Caution!

· Please do not drop or subject this to a strong shock.
· Do not immerse this unit in water or any liquids.
This product is not water proofed.
· Do not leave this instrument inside cars, buses and other vehicles
during warm days.
· Do not expose the product into dust, high temperature and humidity,
or direct sunlight.
· Make sure to remove the pH electrode when changing the battery.
· Turn off the power when the product is not being used.
If the product is not to be used for a long time, please remove thebattery.
· Avoid disassembling the product.
· Always put the tip of the electrode inside the preserved liquid if
not in use.

1. Front Panel Description
23
1

4
5
6

EH-1000

OFFRANGERESOLUTION

72PH INPUT

ON
0~14 PH
0.01PH

8Display
Power Supply Switch
Electrode Socket
Battery Compartment
Calibration (gain)
Calibration (offset)
BNC Plug
pHe electrode preserved liquid

pH ElectrodeLINE SEIKI

Main Unit

Caution· Please do not wipe the unit with benzene or thinner, this may cause
the unit to easily break and produce white marks on the chasis.

SPECIFICATIONS
1. General Specifications*1*2Measuring Method: glass electrode method (Combination Electrode)
Display: 12.5 mm, LCD, 3 ½ digits display
Sampling Time: Approximately 0.4 seconds
Operating Temperature : 0 - 50ºC
Operating Humidity: 90% RH max. (0 - 35ºC) 80% RH max. (0 - 50ºC)
Power Supply: 006P, MN1604 (PP3) or equivalent ... 1 piece
Battery Life
: Approximately 270 hours
Dimensions: Main Unit 131 (H) x 70 (W) x 25 (D) mm ...
ph Electrode ... 9.5 mm x 120 mm
Nearly 200 grams (battery and electrode included)
Accessories: Instruction Manual ... 1 piece
pH Electrode (EH-801) ... 1 piece
Battery ... 1 piece*1 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 2 Combination ElectrodeThe combination electrode is a glass electrode and a reference electrodecombined together to form a single electrode. The combination electrode ismore con venient to handle in processes such as calibration, testing and washing.

* Attention

The pH electrode is easy to damage.
The life depends on the usage and measuring object.
Please exchange it to new one periodically.
The pH electrode is out of our standard warranty.

2. Electrical Specifications: pH 1 - 13
: pH 0.01: pH ±0.07 (ph5 - pH9) pH ±0.1 (ph4 - pH4.9, pH9.1 - 10)
pH ±0.2 (pH1 - pH3.9, pH10.1 - pH13)

PH CALIBRATION PROCEDURE
1. Prepare
1. pH electrode (EH-801)
2. 2 standard buffer solutions (Each sold separately): pH 7.00 (EH-807) / pH 4.00 (EH-804)

2. Two Points Calibration

356P meter
PH8!

* Temperature Conditions : 23±5°C environment testing
1POWER

Wipe off dust, and other dirt on the unit using a dry cloth.

Measuring Range
ResolutionAccuracy

PROCEDURES

7

4. Cleaning

4

Main Unit (Bottom View)

2. Measuring Procedure
After calibrating the meter and electrode, these may now be used..
1. Remove the pH electrode from the preserved liquid bottle, and thenconnect the socket into the meter insert gate.
2. Turn-on the power.
3. Immerse the electrode into the solution. When the value in the display
stabilizes, take the reading.
4. After measuring, please rinse the electrode with distilled water.

3. Battery Replacement
1. When the upper left corner of the LCD display shows “LO BAT”, Battery
need to be replaced.
2. In replacing the battery, slide out the battery cover until it is removed,
then take the battery out.
3. Replace the battery with a new one and position this new battery
correctly inside the meter’s battery compartment.
4. Fasten back the cover.
* The instrument cannot measure accurately after low battery indicator isdisplayed. Please replace the battery immediately.

1. Fasten the pH electrode into the electrode socket, then dip into the pH7
buffer solution.
2. Switch on the power.
3. Adjust“Gain Calibration Adjustment” until the display accurately shows
the value of 7.00

3. Single Point Calibration
1. Fasten the pH electrode to the electrode socket, and dip the electrodeinto the buffer solution (example pH7 or those with other pH values).

* Measuring 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 at pH7.00,
most electrodes will be slightly off.
(b) though the conditions of the environment may be at 25°C
during calibration, measuring between 15 ~ 35°C may still bepossible to do.
If the user wants to keep the electrode performing at high accuracy. It isnecessary to always follow the calibration procedures.

LINE SEIKI CO., LTD.
37-7, 2-chome, Chuo-cho, Meguro-ku, Tokyo, 152-0001 JAPAN
Telephone : 03-5723-891
Fax : 03-3710-4552
E-mail : webtrade@line.co.jp
URL : http://www.lineseiki.com
This manual was last revised November 17, 2010. 4LU006B*Subject to change without prior notice.
All Rights Reserved,Copyright © 2010,LINE SEIKI CO.,LTD.