Apera Instruments PH400 Manual de usuario

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400 Series Portable pH/Conductivity Meter

Instruction Manual

PH400 Portable pH Meter

EC400 Portable Conductivity Meter

PC400 Portable pH/Conductivity Meter

APERA INSTRUMENTS, LLC

www.aperainst.com

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Table of Contents

1Brief Introduction.......................................................................................................................................- 3 -

Measuring Parameters......................................................................................................................- 3 -

Features and Functions ....................................................................................................................- 3 -

Features in pH Measurement ...........................................................................................................- 3 -

Features in Conductivity Measurement............................................................................................- 3 -

2Technical Specifications............................................................................................................................- 4 -

Parameter Specifications..................................................................................................................- 4 -

Other Specifications..........................................................................................................................- 4 -

3Instrument Description..............................................................................................................................- 5 -

4pH Measurement ......................................................................................................................................- 7 -

Information regarding the pH Electrode............................................................................................- 7 -

Information regarding pH Calibration................................................................................................- 7 -

pH Calibration (Take 3-point calibration as an example)..................................................................- 9 -

Sample Measurement.....................................................................................................................- 10 -

Maintenance of the pH Electrode ...................................................................................................- 11 -

5mV Measurement....................................................................................................................................- 12 -

ORP measurement .........................................................................................................................- 12 -

Notes on ORP measurement..........................................................................................................- 12 -

6Conductivity Measurement .....................................................................................................................- 13 -

Information regarding the Conductivity Electrode ..........................................................................- 13 -

Information regarding Conductivity Calibration ..............................................................................- 13 -

Conductivity Calibration ..................................................................................................................- 15 -

TDS, Salinity, Resistivity & Conductivity.........................................................................................- 15 -

Sample test .....................................................................................................................................- 16 -

Maintenance of the Conductivity Electrode ....................................................................................- 16 -

7Parameter Setting ...................................................................................................................................- 17 -

8Complete Kit............................................................................................................................................- 21 -

9Warranty..................................................................................................................................................- 21 -

10 Appendix 1: Table of Parameter Setting and Factory Default Setting................................................- 22 -

11 Appendix 2: Icons and Abbreviation ...................................................................................................- 22 -

12 Appendix 3: Table of Self-Diagnosis...................................................................................................- 23 -

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1 BRIEF INTRODUCTION

Thank you for purchasing Apera Instruments 400 Series Portable pH/Conductivity Meters. Before using the product,

please read this manual carefully to help you properly use and maintain the product. For technical support, please

Apera Instruments reserves the right to update the content of this manual without giving prior notices.

Measuring Parameters

PH400

EC400

PC400

pH/mV

√

Conductivity/TDS

√

Temperature

√

Features and Functions

•The built-in microprocessor chip enables advanced functions such as auto calibration, auto temperature

compensation, auto electrode recognition, parameter setting, self-diagnosis, calibration reminder, calibration

time check, auto power-off, low-battery reminder, etc.

•The meter adopts advanced digital processing technology, intelligently improves the response time and

accuracy of the measurements. Stable reading and auto lock display mode are available for choice.

•Comes with a carrying case, which includes the meter, the electrode(s), calibration solutions, and other

accessories, convenient for in-field use.

•Meets IP57 Waterproof and dustproof rating, ideal for use under harsh environment.

Features in pH Measurement (for PH400 and PC400)

•1 to 3 points auto calibration with calibration guide and self-diagnosis function.

•Automatic recognition of calibration solutions. Two series of standard solutions for choice: USA and NIST

Features in Conductivity Measurement (for EC400 and PC400)

•1 to 4 points auto calibration with calibration guide and auto-check function.

•Single-tap switch between conductivity and TDS.

•Automatic recognition of conductivity calibration solutions.

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2 TECHNICAL SPECIFICATIONS

Parameter Specifications

Technical Parameters

Applicable

Models

Measuring

Range

(0 to 14.00) pH

PH400

PC400

Resolution

0.01 pH

Accuracy

±0.01 pH ±1 digit

Temperature

Compensation

Range

(0 to 100) °C, Automatic or Manual

Measuring

Range

-1000 mV to 0 to 1000 mV

Resolution

1 mV

Accuracy

±0.2% F.S ±1 digit

Conductivity

Measuring

Range

Conductivity: 0 to 200 mS/cm, including 5 ranges:

(0.00 to 19.99) μS/cm, (20.0 to 199.9) μS/cm, (200 to 1999)

μS/cm, (2.00 to 19.99) mS/cm, (20.0 to 199.9) mS/cm

TDS: (0 to 100) g/L, including 5 ranges:

(0.00 to 9.99) mg/L, (10.0 to 99.9) mg/L, (100 to 999) mg/L,

(1.00 to 9.99) g/L, (10.0 to 100.0) g/L

EC400

PC400

Resolution

0.01/0.1/1 μS/cm, 0.01/0.1 mS/cm

Accuracy

±1.0% F.S ±1 digit

Temperature

Compensation

Range

(0 to 50) ℃, Automatic or Manual

Electrode

Constant

0.1 / 1 / 10 cm-1

Temperature

Measuring

Range

0 to 100℃

PH400

EC400

PC400

Resolution

0.1℃

Accuracy

±0.5℃ ±1 digit

Other Specifications

Power Supply

AA Batteries *4 (1.5V*4)

IP Rating

IP57 Waterproof and Dustproof

Dimensions and

Weight

Meter: (3.4×7.7×1.3) inches / 12 oz.

With case: (14×11×3) inches / 3.5 lbs.

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3 INSTRUMENT DESCRIPTION

LCD Display

① — Measuring parameters

② — Measuring value

③ — Reminder icons

④ — Measurement unit

⑤ — Temperature unit

⑥ — Measuring unit in calibration

⑦ — Calibration value, numberings of data storage, and reminder icons

⑧ — Temperature and reminder icons

⑨ — ATC—Auto Temperature Compensation; MTC— Manual Temperature Compensation

⑩ — Stable reading icon

⑪ — Completed calibration icons

⑫ — Auto-Lock reading mode

⑬ — Low battery reminder. Please replace batteries when this icon is displayed.

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Keypad

3.2.1 Short Press — <1.5 s；Long Press — >1.5 s 。

3.2.2 Power On: Short press to power on: LCD displays the measuring mode used last time (Backlight turned

on for 1 minute).

3.2.3 Power Off: The meter can only be turned off in measuring mode by short pressing

Special Notes: Pressing in calibration mode or parameter setting mode will NOT turn the meter off.

Users need to press first to go back to measuring mode, and then press to power off.

Table- 1 Keypad Operation and Functions

Keypad

Operation

Functions

Short Press

•Power on/off

Short Press

Choose measuring mode:

•PH400 pH Meter: →

•EC400 Conductivity Meter: →

•PC400 pH/Cond. Meter: → → →

Long Press

•Enter parameter setting

Short Press

•Cancel any operation and enter measurement mode

Long Press

•Enter calibration mode

Short Press

•In measurement mode: press to turn on/off the backlight

•In calibration mode: press to calibrate

•In parameter setting mode: press to confirm choice

Figure-1

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Short Press

or Long

Press

•In manual temperature compensation (MTC) mode: Short press to adjust

temperature, long press to adjust swiftly.

•In parameter setting mode: press to change the numbering of parameters

in main menu and sub-menu.

•In sub-menu, press to change parameters and settings.

Connectors

The meter adopts 8-pin connector, into which pH, ORP, and conductivity electrode can be connected. When

connected, the meter will automatically switch to the correspondent measurement mode.

Display Mode

3.4.1 Stable Reading Display Mode

When the measuring value is stable, the screen displays as shown in

Figure-2. If does not appear or is flashing, that means the measuring

value has not been stable. Users should wait for the smiley face and not

record the readings or conduct calibrations at that moment.

3.4.2 Auto-Lock Display Mode

In parameter setting P4.6, select “On” to turn on the auto-lock display mode,

In which the reading will be automatically locked after the measuring value

has been stable for more than 10 seconds, and the HOLD icon will come up

as shown in Figure-3. Short press to cancel the hold.

4 pH MEASUREMENT

Information regarding the pH Electrode

The instrument is equipped with a 201T-S 3-in-1 Combination pH Electrode. Its built-in temperature sensor allows

for auto. temperature compensation. There is a vial stored with 3M KCL storage solution on top of the electrode.

Before using, loosen the cap of the vial, take out the electrode and rinse it in distilled water and then do measurement.

When not in use, place the electrode back to the vial and tighten the cap so that the pH sensor can be stored in the

best condition. When the pH electrode is dipped into the test sample solution, stir it for a few seconds to remove

potential air bubbles inside the probe to help the measurement get stabilized quickly.

When connecting the electrode into the instrument, please slowly rotate the connector, identify the location of the

mount to insert it, and then screw it on. Please note that do not pull on the cables in case of poor contact.

Please keep the connector clean and dry. For detailed information of the electrode’s maintenance, please refer to

section 4.5.

Information regarding pH Calibration

4.2.1 Standard Buffer Solutions

The instrument adopts two series of standard buffer solutions: USA and NIST as shown in Table-2. Users can select

which one to use in P1.1 (refer to section 7.3).

Figure-3

Figure-2

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Table-2

Calibration Icons

pH Standard Calibration Solution Series

USA Series

NIST Series

3-point

calibration

4.00 pH

4.01 pH

7.00 pH

6.86 pH

10.01pH

9.18 pH

4.2.2 pH Calibration Modes

The instrument has 1 to 3 points auto calibration mode. The 1st point must be 7.00 pH (or 6.86 if using NIST). Then

choose other calibration solutions to conduct 2nd and 3rd points (see Table-3 for details). In the process of calibration,

the meter will display the electrode’s slope in acid and alkaline ranges.

Table-3 3-point Calibration Mode

USA

NIS

Calibration

icon

When to adopt

1-Point

Calibration

7.00 pH

6.86 pH

accuracy≤ ±0.1 pH

2-Point

Calibration

7.00 pH and

4.00/1.68 pH

6.86 pH and

4.01/1.68 pH

Measuring range: 0 to 7.00

7.00 pH and 10.01

6.86 pH and 9.18

Measuring range: >7.00 pH

3-Point

Calibration

7.00pH, 4.00/

1.68 pH and 10.01

6.86pH, 4.01/

1.68pH, 9.18 pH

Wide measuring range

4.2.3 How often to calibrate

The frequency that you need to calibrate your meter depends on the tested samples, performace of electrodes,

and the requirement of the accuracy. For High-Accuracy measurements (≤ ±0.02pH), the meter should be

calibrated before test every time; For ordinary-accuracy Measurements (≥±0.1pH), once calibrated, the meter

can be used for about a week or longer. In the following cases, the meter must be re-calibrated:

a) The electrode hasn’t been used for a long time or the electrode is brand new.

b) After measuring strong acid (pH<2) or strong base (pH>12) solutions.

c) After measuring fluoride-containing solution and strong organic solution

d) There is a big difference between the temperature of the test sample and the temperature of the buffer

solution that is used in the last calibration.

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pH Calibration (Take 3-point calibration as an example)

4.3.1 Press to enter calibration mode. CAL1 icon will flash in the upper right

corner of the LCD. 7.00 pH will flash in the lower right corner of the LCD,

reminding you to use pH 7.00 buffer to conduct 1st point of calibration.

4.3.2 Use distilled water to rinse off electrode and then dry it. Dip it into pH 7.00

buffer solution, stir gently and let it stand still and wait for the reading to become

stable. In the lower right corner of LCD, the process of auto recognizing the buffer

solution will be displayed. Pressing before the buffer is recognized will

generate Er2 (please refer to table 6).

4.3.3 When the meter locks 7.00 pH, displays on LCD. Press key to

calibrate the meter. End icon appears after calibration is done. The 1st point

calibration is finished. In the meanwhile, CAL2 will flash at the upper right corner,

and 4.00 pH & 10.01 pH will flash alternately at the bottom right, indicating using

pH 4.00 or pH 10.01 buffer solution to make the 2nd point calibration.

4.3.4 Take out pH electrode, rinse it in distilled water, dry it, and dip it into pH

4.00 buffer solution. Stir the solution gently and let stand still in the buffer solution

until a stable reading is reached. The meter’s display will show the recognition

process of calibration buffer solution at the lower right of LCD. When the meter

recognizes 4.00 pH, displays on LCD. Press key to calibrate the

meter. End icon and electrode slope of acidity range display after calibration is

done. In the meanwhile, CL3 will flash at the upper right corner of the LCD, and

10.01 pH will flash at the lower right, indicating using pH10.01 buffer solution to

make the 3rd point calibration.

4.3.5 Take out pH electrode, rinse it in distilled water, dry it, and dip it into pH

10.01 buffer solution. Stir the solution gently and let it stand still in the buffer

solution until a stable reading is reached. The meter’s display will show

recognition process of calibration buffer solution at the bottom right of LCD. When

the meter recognizes 10.01 pH, displays on LCD. Press key to

calibrate the meter. End icon and electrode slope of alkalinity range display after

calibration is done. The meter returns to the measurement mode, displays stable

measuring value and calibration guide icons. Please see Figure-4 for the above

calibration process.

During the calibration process, press key to exit from the calibration mode.

Correspondent calibration guide icons will appear on the LCD.

Figure-8

Figure-4

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Submerge the

electrode in pH4.00

solution, press

key when

appears.

Submerge the

electrode in pH7.00

solution, press

key when icon

appears.

After the 1st point

calibration is done,

press key to

enter the

measurement mode.

Press to

turn on the

meter.

Press key to

enter the

calibration mode.

Sample

Test

1 st point

calibration

2 n d

point

calibration

3 r d

point

calibration

After the 2nd point

calibration is done,

press key to

enter the

measurement mode.

After the 3rd point

calibration is done,

the meter enters the

measurement mode

automatically.

Submerge the

electrode in

pH10.01 solution,

press key when

icon appears.

Sample Measurement

4.4.1 Rinse the pH electrode in distilled water, dry it, and dip it into sample solution. Stir the solution gently and

let it stand still in the sample solution until icon appears and stays on LCD, get the pH reading, which is

pH value of sample solution, please refer to Figure-5 for calibration and measurement process of the pH meter.

Figure-5 Calibration and measurement process of pH meter

4.4.2 Self-Diagnosis Information

Table – 4 Self-diagnosis information

Display

Icons

Contents

How to fix

Wrong pH buffer solution or the buffer

solution out of range.

1.Check whether pH buffer solution is correct.

2.Check whether the meter connects the electrode

properly.

3.Check whether the electrode is damaged.

Press when measuring value is not

stable during calibration.

Press key when icon appears and stays.

During calibration, the measuring value

being unstable for over 3 minutes

1.Check whether there are air bubbles in the glass

bulb. To remove the air bubble, hold the electrode

firmly and flick the electrode in a downward motion

for several times.

2.Replace with a new pH electrode.

pH electrode zero electric potential out

of range（<-60mV or >60mV）

1.Check whether there are air bubbles in the glass

bulb. To remove the air bubble, hold the electrode

firmly and flick the electrode in a downward motion

for several times.

2.Check whether pH buffer solution is correct.

3.Replace with new pH electrode.

pH electrode slope out of range

（<85% or >110%）

4.4.3 pH isothermal measurement principle

According to the pH isothermal measurement principle, the closer the test sample’s temperature is to the calibration

solution’s, the higher the accuracy of the measurement. So this principle is recommended to follow when conducting

tests.

4.4.4 Restore to factory default

The instrument has a function to return to factory default setting, which can be set up in P1.2 (refer to section 7.3).

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