PCE Instruments PCE-PH20S Users guide

Pen type, separate electrode

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PCE Americas Inc.
711 Commerce Way
Suite 8
Jupiter
FL-33458
USA
From outside US: +1
Tel: [phone]
Fax: [phone]
[e-mail]

www.pce-instruments.com/english

www.pce-instruments.com

PCE Instruments UK Ltd.

Unit 11

Southpoint Business Park

Ensign way

Hampshire / Southampton

United Kingdom, SO31 4RF

From outside UK: +44

Tel: [phone]

Fax: [phone]

[e-mail]

SOIL PH METER

Model : PCE-PH20S

our purchase of this
SOIL PH METER marks a
step forward for you
into the field o
precision measurement.

lthough this METER is
a complex and delicate
instrument, its durable
structure will allow
many years of use i
proper operating
techniques a r e
developed. Please read
the following
instructions carefully
and always keep this
manual within easy
reach.

OPERATION MANUAL

TABLE OF CONTENTS

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1. FEATURES................................................................1

2. SPECIFICATIONS......................................................

3. FRONT PANEL DESCRIPTIONS...................................3

3-1 Display............................................................... 3

3-2 Power button ( button ).................................▲ 3

3-3 Hold button ...................................................... 3

3-4 Display reverse button ( button )....................▼ 3

3-5 pH electrode BNC socket..................................... 3

3-6 BNC protection cover...........................................3

3-7 Battery compartment/Cover................................ 3

3-8 pH electrode handle........................................... 3

3-9 pH electrode sensing head................................... 3

3-10 pH electrode BNC plug...................................... 3

3-11 pH electrode protection bottle............................

4. pH CALIBRATING PROCEDURE..................................

4-1 Calibrating Consideration.....................................

4-2 Requiring Equipment for Calibration......................4

4-3 Calibration procedures....................................... 4

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3
4

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5. MEASURING PROCEDURE..........................................5

6. REPLACEMENT OF BATTERY......................................5

7. OPTIONAL ACCESSORIES..........................................6

1. FEATURES

2.SPECIFICATIONS

* Complete set with pen pH meter, soil pH electrode,

pH 4.0 /pH 7.0 standard buffer solution.

* Spear Tip pH electrode ( included ), ideal for

penetration pH measurement into soil, meats, cheese
and other type of measurements requiring sample
penetration. The electrode features a very durable
glass measuring spear packaged in a rugged virtually
unbreakable epoxy body.

* Separate soil pH electrode, easy for general purpose

usage and remote measurement.

*

Auto calibration for pH 4, pH 7 or pH 10.

* B uild in reverse display button.
* Data hold.
* Auto power off.
* Compact size, light weight.
* Optional carrying case.
* Water resistance on the front panel.
* Application : Agriculture, Gardening, Food

industrial, Education, School, Colleges, Laboratory,
Industrial and Quality control.

2-1 Meter

Display LCD, size : 20 mm x 28 mm.

* User can reverse the display direction

by push button.

Measurement 0 to 14 pH x 0.01 pH
Range
Resolution 0.01 pH

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Accuracy ± 0.07 pH(pH5 to pH 9)

± 0.1 pH(pH4 to pH4.9, pH9.1 to pH10)
± 0.2 pH(pH1 to pH3.9, pH10.1 to pH13)

* 23± 5℃
* After calibration.

Input 10^12 ohms.
Impedance
Temperature Not necessary to make adjustment.
Compensation
Sampling Approx. 0.8 second.
Time
Hold Function To freeze the display reading value.
Calibration Auto calibration,
method pH 7, pH 4 ( or pH 10 )
pH electrode BNC connector.
connector
Operating 0 to 50 ( 32 to 122 )℃℉
Temperature
Operating Less than 80% RH.
Humidity
Power Supply DC 1.5V battery ( UM-4/AAA ) x 4 PCs.
Power Approx. 4.8 mA.
Consumption
Dimension Meter :180 x 40 x 32 mm ( 7.1 x 1.6 x 1.3 inch ).

Electrode : Body size : 12 mm dia. x 160 mm.
Electrode cable length : approx.. 1000 mm.

Weight 220 g/0.48 LB (included electrode).

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Standard Instruction Manual......................... 1 PC.

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Accessories

Soil pH electrode............................ 1 PC.

pH 4.0 buffer solution, PH-04A.......

pH 7.0 buffer solution, PH-07A.......

1 PC.
1 PC.

2-1 Soil pH Electrode ( included )

pH Measuring 1 to 13 pH ( typical 0 to 14 pH ).
Range
pH Operation 5 to 60 ( 41 to 140 ).℃℉
Temperature
pH Electrode Combination type.
Structure
Reference Ag/AgCl, Double Junction.
of pH
Electrode
Zero Potential 7± 1 pH.
for pH Value
Repeatability 0.05 pH.
Response time 2 minutes.≧
Body Material Epoxy.
Connector BNC.
Mechanical With protection bottle ( soaker
Protection bottle ) on the electrode head.
Weight 68 g ( including cable & socket ).
Dimensions Body length - 160 mm.

Body Dia. - 12 mm.
Cable length - 1000 mm.

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3. FRONT PANEL DESCRIPTION

Fig. 1

3-1 Display
3-2 Power button ( button )▲
3-3 Hold button
3-4 Display reverse button (
3-5 pH electrode BNC socket
3-6 BNC protection cover
3-7 Battery compartment/Cover
3-8 pH electrode handle
3-9 pH electrode sensing head
3-10 pH electrode BNC plug
3-11 pH electrode protection bottle

4

button )▼

4. pH CALIBRATING PROCEDURE

4-1 Calibrating Consideration

The pH meter already calibrated by mV signal that
simulated from the ideal pH ELECTRODE mV output
( base on 25 environment ). However due to (a) An℃
ideal electrode will produce 0 mV at pH 7.00, but most
electrodes are slightly off. (b) The measuring environment
temperature may not near 25 ( 15 to 35 ). ℃℃
If intend to keep instrument combined electrode within
high accuracy, it is necessary to make the following
calibration procedures ( 4-3 ).

4-2 Requiring Equipment for Calibration

1)Combination soil pH electrode (included).

2)Buffer solutions :

pH 7.00 buffer solution (included).
pH 4.00 buffer solution (included).

4-3 Calibration procedures

pH 7 calibration

1)Connect the pH electrode plug ( 3-10, Fig. 1 ) to the BNC
socket ( 3-5, Fig. 1 ) and place electrode into pH 7.00
buffer solution.

2)Power on the instrument by pressing the " Power button
" ( 3-2, Fig. 1 ).

3)Press the " Hold button " ( 3-3, Fig. 1 ) once.
the display will show the " HOLD " symbol.
Press the " ▼
show following screen in sequence.

button " ( 3-3, Fig. 1 ) once, the display will

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screen 1

screen 2

flash CAL

screen 3

CAL

CAL flashing

7.00

7.00 flashing

screen 4

End

screen 5 ( return to normal screen )

7.00

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pH 4 calibration

1)Rinse the electrode in distilled water.
Place electrode into buffer pH 4.00 solution.

2)All the calibration procedures are same as the
above pH calibration, except :

a. Change the buffer solution to pH 4.00.
b. The calibration screen value will change to 7.00

instead of 4.00

Remark :

* Except calibrate pH 7, pH 4, meter also can calibrate

pH 10.

* The calibration procedures should start from the pH 7 at

first, then pH 4 ( or pH 10 ).

* During the calibration, the circuit will sensing solution

value automatically. If the buffer solution value already
beyond 7± 1 pH. 4± 1 pH, 10± 1 pH, the LCD will show
" Err ".

* When the LCD show the screen 2, it allow the user to

adjust another calibration value precisely ( for example

7.01, 6.99... ) by pressing the " ▲ button " ( 3-2, Fig.
1 ) , " ▼ button " ( 3-4, Fig. 1 )'

* Rinse the electrode in distilled water before change

the buffer solution.

* Repeat above pH, pH calibration procedures two

times at least.

* After calibration, the " Electrode sensing head "

( 3-9, Fig. 1 ) should insert into the " Protection bottle
" ( 3-11, Fig. 1 ).

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5. MEASURING PROCEDURE

After the meter along the pH electrode is calibrated
( section 4-3 ) , the unit is ready for measuring.

1)Connect the pH electrode plug ( 3-10, Fig. 1 ) to the BNC
socket ( 3-5, Fig. 1 ) and place electrode into the
measured solution.

2)Power on the meter by pressing the " Power button "
( 3-2, Fig. 1 ).

3)Place the electrode into the measured soil or other
type penetration material ( such as cheese, meats... )
or solution, then the instrument will display the pH
value.

* Electrode ( attached ) is the

rough and durable penetration
electrode. However user should
operate the electrode very carefully.

* The electrode is the consumer

accessory, after the electrode is
used, if the damage of the
Electrode Sensing Head ( Spear
Tip Head ), it is without warranty.

* After make the measurement, please rinse the

electrode in distilled water.

* After calibration, the " Electrode sensing head " ( 3-9,

Fig. 1 ) should insert into the " Protection
bottle " ( 3-11, Fig. 1 ).

Data hold

During the measurement, press the " Hold button " ( 3-3,
Fig. 1 ) once will hold the measured value & the LCD will
display a " HOLD " symbol.

* Press the " Hold Button " once again will release the

data hold function.

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Display reverse

1)When the LCD display show " " ,

During the measurement, press the " Display reverse
button " ( 3-4, Fig. 1 ) once will reverse the display
direction for the user convenience.

* Press the " Display reverse button " once again will

return to the normal display.

Auto power off

The meter is built the " Auto power shut off " function to
save battery life. If any function buttons are not pushed
within 10 minutes, the power will be off automatically.

6. REPLACEMENT OF BATTERY

It is necessary to replace the battery. However, in-spec
measurement may still be made for several hours after
Low Battery Indicator appears before the instruments
instrument become inaccurate.

2)

To replace the battery, rotate and remove the "
Battery Cover " ( 3-7, Fig. 1 ), take out the old
batteries, install new batteries :

DC 1.5V battery ( UM-4/AAA ) x 4 PCs.

3)When install the batteries, should make attention the
battery polarity.

4)After install the batteries, reinstall the battery cover
again.

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