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6. Warranty

4. Error Messages 

5. Battery Replacement

4320-E08

1. Names of Functions and Components

DPH-2

Cat.No. 4320

R

Before using the DPH-2, read this instruction manual and fully understand the function and operation of each part.

Perform the necessary operations according to this instruction manual.

When  carrying  the  unit,  be  careful  not  to  subject  the  instrument  to  any  strong  shock  or  impact.    Do  not  drop  the 

instrument.

ATAGO  shall  not  be  held  responsible  for  any  or  all  damages  that  may  result  from  using  the  instrument  for  those 

other than its intended purpose (measurement of pH level of a liquid sample).

If use of this unit has undesired effects on the consumption of the measured materials, etc., ATAGO shall not be 

liable for the result.

All instruments received for repair are subject to a possible inspection fee. ATAGO does not warrant the problems 

which are caused by user error even though the unit is under warranty. 

CAL button

HOLD/ENT button

Lift the locking clip on the front side of the 

battery compartment lid towards you until it 

is  free.  Next,  lift  the  clip  on  the  back  side 

in  the  same  way  to  remove  the  lid 

completely (Fig. 1).

As  shown  in  Fig.  2,  four  watch  batteries  are 

included with the unit at the time of purchase.

When replacing new batteries, insert them in 

the same manner as shown in Fig. 2.

Replace the battery compartment lid, making 

sure the locking clips are secured.

LIFT

Front

Back

Thank you for your purchase of a quality ATAGO product. 
Please read this manual carefully before using this product.

ATAGO instruments are rigorously inspected to ensure each unit meets the highest standards of quality assurance.

Caution

Digital pH Meter

Instruction Manual

Old batteries

Replace with new batteries.

Wrong or bad buffer value

Make sure the buffer is correct.

The sensor is failing

 Check the sensor.

Out-of-range signal   

→ 

Make sure the measured sample is 

                                                within the measuring range.

→ 

Make sure the electrode is in contact

      with the sample solution.

The electrode is not in 

contact with the sample

solution

4 watch 

batteries

The DPH-2 is warranted for one year after the date of purchase against any manufacturer defect in materials or workmanship. 

Any of the following events happening to the unit will void the warranty:

Disassembled by anyone other than authorized service provider  

Immersed in liquid or dropped

Misused, abused, or used/stored in improper ambient conditions  

Damages to the electrode

7. DPH-2 Specifications

Measurement range 
Minimum indication 
Measurement accuracy 
Temperature correction range 
Calibration 
Power supply  
Dimensions and weight 






:  

0.0 to 14.0pH
0.1pH

±

0.1pH (2.0 to 12.0pH)

0 to 50 

 (Automatic Temperature Compensation)

3-point (4.0, 7.0 and 10.0)
watch battery (LR44) 1.5V

×

4.5

×

3.0

×

16.3cm,  90g

(included)

Instruction manual : 1

Watch battery         : 4

Accessories

Electrode cap

Electrode

Battery

compartment lid

ON/OFF button

LCD (Liquid 

Crystal Display)

Fig.2

Fig.1

2010K Printed in Japan

Headquarters: The Front Tower Shiba Koen

23rd Floor 2-6-3 Shiba-koen, Minato-ku 

Tokyo 105-0011, Japan

TEL: 81-3-3431-1943  FAX:81-3-3431-1945  

[email protected]   http://www.atago.net/

TEL: 1-425-637-2107  FAX: 1-425-637-2110

[email protected]

TEL: 91-22-28544915 / 40713232

[email protected]

TEL: 66-21948727-9 ,66-21171549

[email protected]

TEL: 55 16 3913-8400

[email protected]

TEL: 39 02 36557267

[email protected]  

TEL: 86-20-38108256

[email protected]

TEL: 7-812-777-96-96

[email protected]

TEL: 234-707-558-1552

[email protected] 

TEL: 7-727-257-08-95

[email protected] 

Tap water

Sample
liquid

Electrode Care and Maintenance

1. Soak the electrode in

    tap water for at least 

    15 minutes.

2. Blot the electrode 

    lightly to remove 

    excess water.

3. Calibrate with a pH 7.0 buffer 

    solution as well as either pH 4.0 

    or pH 10.0, whichever closer to 

    the pH level of the liquid to be 

    measured.

Buffer 
solution

4. Measure your sample 

    liquid.

5. Soak the electrode 

    in tap water for 

    at least 15 minutes 

    after measuring.

Tap water

6. Blot the electrode lightly to remove excess water. 

    Store with the protective cap on and in the original box.

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