SATO KEIRYOKI SK-650PH Manuale utente

Instruction manual

for

No. 6427-00 Desktop Type pH Meter

Model SK-650PH

No. 3 Nishi-Fukudacho, Kanda, Chiyodaku, Tokyo 101-0037 Japan

URL: http://www.sksato.co.jp/english/

M11

Introduction

Thank you for purchasing the desktop type pH meter Model SK-650PH.

-This pH meter is designed to measure hydrogen ion concentration (pH) and temperature (liquid

temperature). Do not use this instrument for any other purposes.

-Read this instruction manual thoroughly before use and keep the manual it in a safe place for future

references.

Warnings

The SK-650PH is not explosion-proof. Never use it for flammable materials.

DANGER

RISK OF EXPLOSION

-For any other inquiries, contact the store where you purchased the instrument or our service network.

Precautions in use

For proper use of the SK-650PH, be sure to observe the followings:

-This is a precision instrument. Be careful not to drop or knock it.

-The operating temperature range for this instrument is 5 to 40°C and a relative humidity is less than 95%.

Operating this product outside the temperature range may result in unit malfunctions.

-Avoid using this unit in a place exposed to direct sunlight or near a heat source. Otherwise, the case may

become deformed or malfunction may be caused.

-If this instrument is left in a car in the hot summer sun, it will become extremely hot and may malfunction. Do

not leave the unit in such a place.

-If this unit is used in an environment where electrical noise is generated, the display may become unstable

or the measurement error may increase.

-Never disassemble or modify the unit. Doing so may cause malfunctions.

-Do not wash or wipe this unit with alcohol, thinner, or other solvents. If the unit becomes dirty, wipe it with a

tightly-wrung towel or the like that has been dipped in warm water with a neutral detergent.

-If the pH standard solution contacts the skin (hand), immediately wash the contaminated skin with running

water. If the solution gets into the eyes, immediately rinse with water and consult a doctor.

-Keep the pH standard solution out of reach of children. If accidentally ingested, consult a doctor immediately.

Overview

The SK-650PH pH meter is a desktop type pH meter having a sensitivity display function that can check the

deterioration state of sensor. Sensor arm that is convenient to use stirrer is equipped.

Features

Sensitivity display function

Sensitivity display function can check the deterioration state of sensor. This is very useful to determine

the timing of the maintenance and exchange of sensor.

Stability display function

Easily find the measuring values are stabilized

Auto temperature compensation

Automatic temperature compensation can produce more accurate pH measurements.

Measured value, date and time are simultaneously displayed

Calibration at one to three levels can be done

Selectable calibration point (at 25°C) among 4.01, 6.86 and 9.18 or 10.01

Data recording function

The recording capacity is max. 99 data

Measured value can be transmitted to a computer

RS-232C transmission is a standard equipment (RS-232C cable is provided at option)

Auto Power-Off

The "auto power-off" function turns off the unit 20 minutes after the power is turned on.

This conserves battery life if you forget to turn off the unit.

Sensor arm is equipped

Convenient for the use of stirrer or like

Various electrodes are provided

Wide applications are available

Before use

Check that the unit has not damaged during transportation. If damaged, please contact the shop you

purchased or our service network.

Components names and functions

1. Main unit

(1) Display: Displays measured values or the status of the unit.

For details, refer to "LCD"

(2) : Key used to switch between the pH and mV displays. Also used to change the values in the

various setting modes.

(3) : Key used to record data on the unit. Also used to change the values in the various setting modes.

(4) : Key used to confirm the values set in the various setting modes. Also used to switch to the

MAX/MIN function while the recorded data is displayed.

(5) : Key used to hold the measured values. Also used to retrieve the data recorded on the unit.

(6) : Key used to switch to the calibration mode.

Also used to return to the measurement mode from the various setting modes.

(7) : Key used to turn on or off the unit. Also used to switch to the various setting modes.

(8) Memo drawer: Can be used to hold memos on measurement information or operation procedures.

(9) DC : Port used to connect the AC adapter.

(10) RS232C : Port used to connect RS-232C cable

(11) GND (Ⅰ) : Port for earth

GND (Ⅱ)

(12) ANALOG : Port to output electromotive of pH sensor

(13) BNC : Port used to connect pH sensor

(14) ATC : Port used to connect temperature sensor

Rear view

2. LCD

(1) Display of pH or mV : Displays pH values or mV values.

(2) Display of temperature : Displays temperature values or temperature setting values

(3) ATC : Lights up when the temperature sensor is connected.

(4) Display of clock : Year, month, date and time are displayed

(5) Number of stored data : Indicates the numbers of stored data

(6) REC : Lights up when the stored data are displayed.

(7) MAX : Lights up when the maximum value is displayed.

(8) MIN : Lights up when the minimum value is displayed.

(9) READY : Lights up when the measured value is stable

(10) HOLD : Lights up when the measured value has been held

(11) MEM : Lights us when the measured value are being logged.

3. Sensor section (PHP-31 sensor probe: option)

(1) pH sensor connection plug : This product uses the BNC connector

(2) Temperature sensor connection plug: This product uses the ATC plug

(3) Glass electrode protection bottle : Contains the phthalate pH standard solution (set at the factory)

(4) Liquid junction

(5) Glass electrode

(6) Electrode holding tube

(7) Sensor cable

Before Measurement

1. Preparation of pH sensor (3 IN 1 Model PHP-31)

To prevent the glass electrode from becoming dry, the PHP-31 sensor probe is equipped with a glass

electrode protection bottle which contains the phthalate pH standard solution. Remove the protection bottle

before measuring. Reinstall the protection bottle after measurement.

Removing the glass electrode protection bottle

(1) Hold the sensor probe upright so as not to spill the standard

solution in the protection bottle. Turn the protection bottle

counterclockwise while pressing the cap.

(2) Slide the cap to take it out from the sensor probe as shown in

the figure on the right.

Installing the glass electrode protection bottle

(1) Install the protection bottle to the sensor probe in the reverse order of

removal.

(2) Hold the sensor probe upright so as not to spill the standard solution in the

protection bottle. Turn the protection bottle clockwise while pressing the cap.

(3) After installing the protection bottle, push in the sensor probe until its tip hits the bottom of the

protection bottle.

Note: * When installing or removing the glass electrode protection bottle, pay attention not to spill the

standard solution in the bottle. If the standard solution comes in contact with the skin (hand),

immediately wash the contaminated skin with running water.

If the solution gets into the eyes, immediately rinse with water and consult a doctor.

* If the standard solution in the bottle is spilled, replenish the bottle with the phthalate pH standard

solution to protect the glass electrode from becoming dry. Adding distilled water, pure water or tap

water before storing is recommended.

2. Connection

Connecting the sensor to the unit

(1) Connect the pH connector of the sensor to the BNC port on the back of the unit.

Be sure to insert the connector with its holes aligned with the BNC terminal pins.

(2) Plug the temperature connector of the sensor into the ATC port on the back of the unit.

Connecting the AC adapter

Plug the AC adapter into the DC port on the back of the unit.

Caution

* Do not connect the AC adaptor with wet hands or in a place exposed to water splashes.

Doing so is dangerous, as it could cause electrical shock.

* Be sure to use the dedicated AC adapter for the SK-650PH.

cap

protection bottle

3. Setting up the sensor arm

To use the sensor arm, follow the setup procedure described below.

(1) Assemble the sensor arm as shown in the figure below.

Insert until a "click" sound is heard.

(2) Install the sensor arm on the unit as shown in the figure below.

(3) Install the sensor on the arm as shown in the figure below.

Install the sensor arm by aligning its mounting

position with the unit mounting position as

shown in the figure on the right.

Sensor arm mounting positions on the unit

(The sensor arm can be installed on either side.)

Unit mounting position on the sensor arm

Arm adjustment screw

Upper arm

4. Temperature compensation function

The SK-650PH is equipped with two types of temperature compensation.

1. Automatic temperature compensation (ATC)

: The sample temperature is measured by the temperature sensor included in the pH sensor, and is

automatically compensated.

* Once the temperature connector of the pH sensor is plugged into the unit, the ATC indicator lights up to

indicate that the automatic temperature compensation is available.

2. Manual temperature compensation (MTC)

: The temperature of the solution under measurement is manually set for temperature compensation.

How to operate Manual temperature compensation (procedure)

(1) Remove the temperature connector of the pH sensor from the unit.

The ATC indicator goes out to indicate that the manual temperature compensation is available.

(2) Press and hold the key for at least two seconds in the measurement mode.

The CAL indicator starts flashing to indicate that the manual temperature setting is available.

Default value : 25.0°C

Manual setting range : −5.0 to 80.0°C

(3) Press either the or key to set the desired temperature, and then press the key

to confirm. The unit returns to the measurement mode and the temperature value that was just set

appears.

5. Calibration

For more accurate measurement, calibration of about once a day is recommended.

Prepare the following items for calibrating the SK-650PH

. Standard Solutions

Item

Standard Solution

pH value at 25°C

pH 4

phthalate solution

pH 4.01

pH 7

neutral phosphate solution

pH 6.86

pH 9 or pH 10

carbonate solution or borate

pH 9.18 or pH10.1

. Distilled water, pure water or tap water

. Four beakers (each beaker to contain one type of standard solution or water (distilled, pure or tap water)

To ensure accuracy, perform calibration at the same temperature as the material to be measured. The pH

standard solution bottle which comes with the instrument can be used as a substitute for a beaker.

About the calibration point

The calibration point in the SK-650PH can be selected based on the usage of the unit. Conduct the

calibration referring to the following information.

. 3-point calibration: Should be used when the pH property of the sample solution is unknown.

. 2-point calibration:

When the pH property (acidic or alkaline) of the sample is predetermined, use the

following two points: For acidic samples: pH 4 and pH 7

For alkaline samples: pH 7 and, pH 9 or pH10

. 1-point calibration: Use a pH standard solution close to the expected value of the sample solution.

How to calibrate the SK-650PH

(1) Press the key to turn on the unit, and then press the key to change to the pH display

mode.

(2) Remove the glass electrode protection bottle, and then thoroughly wash the glass electrode with water

(distilled, pure or tap water). After washing, use clean filter paper, cotton swabs or tissue paper to absorb

the water on the glass electrode.

Note: When washing the glass electrode, be careful not rub it. Doing so could generate static electricity

resulting in unstable pH readings.

(3) Press and hold the key for at least two seconds to cause the CAL indicator to flash and to

proceed to the calibration mode.

(4) Press the key to select the calibration point.

(5) Immerse the glass electrode into the selected pH standard solution until the liquid junction is submerged,

and wait until the pH reading becomes stable.

When the stability indication function is on, the READY indicator lights up once the pH reading becomes

stable. For details on the stability indication function, refer to "Stability indication function"

(6) Press either the or key to set the pH calibration value to the value of the standard solution,

and then press the key to confirm.

* To ensure accuracy, perform calibration at the same temperature as the material to be measured.

Calibration mode

- : changes the setting value

- : confirms the setting value

Measurement mode (pH display mode)

Press for 2 sec.

pH value measured

pH calibration set value

pH 9 or pH 10 calibration

Default display: pH9.50

pH 7 calibration

Default display: pH7.00

pH 4 calibration

Default display: pH4.00

Measurement mode (pH display mode)

●Setting range of calibration

Value

Default

Setting range

pH4

pH4.00

pH3.00 to 5.00

pH7

pH7.00

pH6.00 to 8.00

pH9 or pH10

pH9.50

pH8.50 to 10.5

●Relations of pH and Temperature

Standard

Solution

Liquid Temp.

pH4

Phthalate solution

0°C

4.00

20°C

4.00

40°C

4.04

5°C

4.00

25°C

4.01

45°C

4.05

10°C

4.00

30°C

4.02

50°C

4.06

15°C

4.00

35°C

4.02

pH7

Natural phosphate

solution

0°C

6.98

20°C

6.88

40°C

6.84

5°C

6.95

25°C

6.86

45°C

6.83

10°C

6.92

30°C

6.85

50°C

6.83

15°C

6.90

35°C

6.84

pH9

Borate solution

0°C

9.46

20°C

9.22

40°C

9.07

5°C

9.40

25°C

9.18

45°C

9.04

10°C

9.33

30°C

9.14

50°C

9.01

15°C

9.28

35°C

9.10

pH10

Carbonate solution

0°C

10.32

20°C

10.06

40°C

9.89

5°C

10.24

25°C

10.01

45°C

9.86

10°C

10.18

30°C

9.97

50°C

9.83

15°C

10.12

35°C

9.92

JIS Z 8802-1984 (2006)

(7) Wash the glass electrode with water (distilled, pure or tap water).

(8) To continue performing calibration with another point, press the key to select the calibration point,

and then follow the steps from (5) above.

(9) Upon completion of calibration, press the key to end the calibration mode. The unit returns to the

measurement mode.

(10) Press the key to turn off the unit.

Note that the calibration set value is retained even if the AC adapter is pulled out.

Measuring the pH

(1) Press the key to turn on the unit. All indicators on the LCD light up for about one second to

indicate that the unit is in the measurement mode.

(2) Immerse the electrode into the material to be measured until the liquid junction is submerged.

Note: When moving the sensor arm, prevent it from tipping over by holding the arm with your hand.

(3) Make sure that the reading is stable (READY is lit), and then read the values.

* About the stability indication function:

With the SK-650PH, the READY indicator lights up to indicate that the reading has become stable.

For details, refer to "Stability indication function".

Depending on the material to be measured, there may be instances when the reading cannot be

stabilized. In that case, use the HOLD function to read the values.

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