SATO KEIRYOKI SK-620PHII User manual

Instruction manual
No. 6436-00 Handy type pH meter
Model SK-620PHII
(without probe type)
3-4, Kanda-kajicho, Chiyoda-ku, Tokyo 101-0045 Japan
https://www.sksato.co.jp/en/
P.06

1
Introduction
Thank you for purchasing the handy type pH meter Model SK-620PHII.
- This pH meter is designed to measure hydrogen ion concentration (pH) and temperature (liquid temperature).
Do not use SK-620PHII for any other purposes.
- Read this instruction manual before using the SK-620PHII and keep it in a safe place for future references.
Important safety instructions
The SK-620PHII is not explosion-proof. Never use it for flammable materials.
DANGER
RISK OF EXPLOSION
- Do not use the pH standard solutions for any purposes other than to calibrate pH meters.
The solutions are not for drinking. Never try to drink it. If accidentally ingested, consult a doctor immediately.
- For any other inquiries, contact us or the store where you purchased the instrument.
Precautions in use
For proper use of the SK-620PHII, be sure to observe the followings:
- This is a precision instrument. Be careful not to drop or knock it.
- 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 use this instrument outside the operating range. Doing so may cause malfunctions.
- This instrument is not waterproof. Do not place it in water or use it where it may be splashed with water.
- When used outdoors, keep the unit out of rain or water splashes. If it becomes wet, the unit may fail.
- If the unit will not be used for a long period of time, always remove the battery. Otherwise, the battery power
may be wasted and the battery fluid may leak, resulting in 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.
- Do not alter, pull forcibly, bend or bind the sensor probe, as doing so may cause a break in the probe. Also, do
not place heavy objects on the cord or heat it, as doing so damage the cord.
- When measuring, do not let the sensor probe come in contact with the human body.
- When the unit is used for the first time or after it has been stored for several days, the pH measurement
response may be slower. In such cases, immerse the sensor probe electrode in either the pH standard solution
or water and let it stand for one hour. For more accurate measurement, immerse it 12 hours at least in the pH 4
standard solution before use. * (Do not turn on the unit during this immersion time.)
- The sensor probe electrode of this unit may be damaged or its useful life may be shortened if it is used for
liquids such as organic solvents, oils, adhesives, strong acids (pH 0 to pH 2), strong alkalis (pH 12 to pH 14)
and surface-active agents.
- The pH reading may become unstable when pure water is measured.
- If the pH standard solution contacts the skin (hand), immediately wash the contaminated skin with running

2
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.
- When using the AC adapter (optional), do not connect or disconnect the power cord with wet hands. Otherwise,
electrical shock or short-circuit may occur.
Overview
The SK-620PHII pH meter is easy-to-operate instrument for measuring hydrogen ion concentration (pH) and
liquid temperature.
The meter can be calibrated at three points (pH4, pH7 and pH10) and provides reliable measurements by using
the built-in automatic temperature compensation.
Features
Large LCD for easy reading
The pH value and the temperature are indicated on a large LCD.
Auto Power-Off
The "auto power-off" function turns off the power automatically if the unit is not operated for 20 minutes. This
conserves battery life if you forget to turn off the unit.
Auto temperature compensation
Once the PHP-31 sensor probe is connected to your SK-620PHII, it will perform automatic temperature
compensation to produce more accurate pH measurements.
Various optional probes are provided
Various optional probes are usable to wide variety of applications.
Cautions before use
Check that the instrument has not been damaged during transport. If damage is found, contact us or the store
where you purchased the instrument.

3
Components names and functions
•Main unit
①Display
: Displays measurement readings or status of the unit.
②PWR key
: Press this key to turn on the unit. To turn off the unit, press the key again.
③CAL key
: Enters the calibration mode.
④SKIP key
: Enters the manual temperature setting mode. Skips the setting in the
calibration mode.
⑤REC key
: Pressing this key while in the measurement mode will move to the
MAX/MIN logging mode. When pressed while in the calibration mode or in
the manual temperature setting mode, setting value will be stored.
⑥pH/mV key
: Press this key to switch the pH and mV.
Increases (↑) the set value in the calibration mode or manual temperature
setting mode.
NB. Voltage (mV) displayed is a reference value for an electromotive force of
sensor. This is not used for pH measurement.
⑦key
(backlight key)
: Press this key to turn on the backlight on the LCD
Decreases (↓) the set value in the calibration mode or in the manual
temperature setting mode.
⑧Jack for RS-232C cable
⑨Jack for AC adaptor
⑩Battery cover
: Connects RS-232C cable
: Connects the dedicate AC adapter
: Uses a 6F22 (006P) 9V battery for this instrument.
⑪Screw for battery cover
: Secures the battery cover to the main unit.
•Top face of the case
⑫pH sensor connecting jack
Used to connect the sensor. This product uses the BNC connector
⑬Temperature sensor connecting jack
Used to connect the temperature sensor.
OPEN
PWR REC
CAL pH/mV
SKI P
DC 9V RS
232
②
③
④
⑤
①
⑥
⑦
⑩
⑧
⑪
⑨

4
•LCD
⑭Display of pH or mV : Displays pH values or mV values in the measurement mode.
Display the calibration values in the calibration mode.
⑮Display of temperature : Displays temperature values in all modes.
⑯Temperature unit : Indicates the unit (°C) of temperature measured.
⑰pH unit : Indicates the unit (pH) of hydrogen ion concentration measured.
⑱Voltage unit : Indicates the unit (mV) of voltage measured.
⑲REC : Lights up in MAX/MIN logging mode
⑳MAX : Lights up when the maximum pH or voltage value is displayed.
㉑MIN : Lights up when the minimum pH or voltage value is displayed.
㉒BAT : Lights up when battery power is insufficient. Replace with a new battery
(6F22, 006P).
㉓ATC : Lights up when the temperature sensor is connected.
㉔Display of time/voltage : Indicates the time elapsed since logging (REC) started while in the MAX/MIN
logging mode. Displays "voltage”in the calibration mode.
•Sensor section (PHP-31 sensor probe)
①pH sensor connection plug
(BNC connector)
②Temperature sensor connection plug
: Connect with the jack of temperature
sensor connector of the main unit.
③Glass electrode protection bottle
: Contains the phthalate pH standard
solution (set at the factory).
④Liquid junction
⑤Glass electrode
⑥Electrode holding tube
⑦Sensor cord

5
Before Starting Measurement
1. Installing and replacing battery
Install or replace battery when firstly use of the unit or [BAT] mark is lit.
(1) Install the battery before connecting the probe to the unit.
Remove the probe from the unit before when replacing battery,
(2) Remove the screw holding the battery cover by turning it counterclockwise with a Phillips screwdriver. Be
careful not to be missing the screw.
(3) When replacing the battery, remove the old battery.
(4) Install a new 9V battery (6F22, 006P) by referring to the polarity marks (+ and -) on the battery compartment.
(5) Place the battery cover on the unit and secure it to the unit with the screw.
Caution
- When "BAT" is lit on the LCD, immediately replace the battery with new one.
Otherwise, the measurement accuracy may be affected or malfunction may occur.
- Keep the battery out of reach of children. If swallows a battery accidentally, consult a doctor immediately.
- Do not dispose of used battery in a fire.
- For environmental protection, dispose of used battery in compliance with local rules and regulations.
2. Preparation of probe in case of PHP-31
* As for the other probes, read the manuals attached with the probes.
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.
NB. The response may become slow when the unit is used first time or after a few days’ storage. If so, immerge
the glass electrode in a pH standard solution or water for 2 hours or more. For more accurate measurement,
immerge it in pH 4 standard solution for 12 hours or more.
(1) Removing the glass electrode protection bottle
①Hold 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.
②Slide the cap to take it out from the sensor probe as shown in the figure on the right.
(2) Installing the glass electrode protection bottle
①Install the protection bottle to the sensor probe in the reverse order of removal.
②Hold 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.
③After installing the protection bottle, push in the sensor probe until its tip hits the bottom
of the protection bottle.
cap
protection bottle

6
Note: Pay attention not to spill the standard solution in the bottle when installing or removing the glass electrode
protection 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.
3. Connect the sensor probe to the main unit
(1)Connect the sensor probe plug to the pH sensor connecting jack of the main unit.
Be sure to match the pins of the sensor probe with the grooves of the main unit securely.
(2)Connect the temperature connector plug of the sensor probe to the temperature connecting jack of the main
unit.
4. Auto power-off function
The unit is turned off by the auto power-off function if no key is operated for 20 minutes. Turn off the auto
power-off beforehand with the following procedure if measurement is to be done continuously or the pH data
is logged.
(1)Press the PWR key while pressing the CAL key at the same time to turn on the unit,
and then release the PWR key first.
(2)When the "n" character appears on the display, release the CAL key.
This cancels the auto power-off.
Note:Auto power-off is no longer cancelled once the unit is turned off. Perform the auto power-off canceling each
time as necessary.
5. Temperature compensation function
The SK-620PHII is equipped with two types of temperature compensation.
•Automatic temperature compensation (ATC)
The sample temperature is measured by the temperature sensor included in the pH sensor, and is
automatically compensated.
NB. Once the temperature sensor connection plug is connected to the unit, [ATC] indicator lights up to
indicate that the automatic temperature compensation is available.
•Manual temperature compensation (MTC)
The sample temperature measured is manually set for temperature compensation.
(1) How to operate Manual temperature compensation (procedure)
①Disconnect the temperature sensor connection plug from the unit.
[ATC] indicator goes out to indicate that the manual temperature compensation is available.
(Default setting value is 25.0°C)
②Press and hold the SKIP key for two seconds or more in the measurement mode. [St] and the
temperature setting value are indicated upper and lower respectively and then the manual temperature
setting mode starts.
③Set the temperature to the desired reading by using the pH/mV key (↑) or the key (↓).
④By pressing the REC key to confirm, [SA] is indicated and the setting value is stored.
Even if the power is turned off, the temperature value is still remained.

7
6. Calibration mode
By performing the 3-point calibration, SK-620PHII can accurately measure the pH. For more accurate
measurement, calibration of about once a day is recommended.
For calibrating the SK-620PHII, prepare the following items.
. pH 4 standard solution (phthalate solution): pH 4.01 (at 25°C)
. pH 7 standard solution (neutral phosphate solution): pH 6.86 (at 25°C)
. pH 10 standard solution (carbonate solution): pH 10.01 (at 25°C)
. 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)
* The pH standard solutions which come with SK-620PHII are used as a reference. For accurate calibration,
separately prepare the standard solutions.
* Optional probes other than 640S-2 probe can use the pH standard solution bottle which comes with SK-620PHII
as a substitute for a beaker at calibration.
* When the standard solution bottle is used for the calibration, perform calibration at the same temperature as the
material to be measured to endure the accuracy.
•How to calibrate the pH meter
CAL key REC or SKIP key REC or SKIP Key REC or SKIP Key
Measurement mode Calibration pH4 Calibration pH7 Calibration pH10
Calibration mode
Auto-return (after three seconds)
(1)Connect the sensor probe to the main unit.
(2) Press the PWR key to turn on the unit. The unit enters the measurement mode. Remove the glass electrode
protection bottle from the sensor probe.
(3)Thoroughly wash the glass electrode with water (distilled, pure or tap water).
(4)After washing, use clean filter paper, cotton swabs or tissue paper to absorb the water on the glass
electrode. When washing the glass electrode, be careful not rub it. Doing so could generate static electricity
resulting in unstable pH readings.
(5) Absorbing the water on the glass electrode, press the CAL key to enter the calibration mode. Check that
[4.00] is displayed on the LCD and "CA: Voltage" appears on the display.
Note: "Err" is displayed on the voltage section of the LCD, if the sensor probe is
not connected to the unit or the glass electrode is dry. To reset the display
to the voltage, place the glass electrode in the pH4 standard solution. If
the reset fails, the glass electrode or the standard solution may be
deteriorated. Refer to the troubleshooting section.
(6) Immerse the glass electrode into the pH 4 standard solution. Slowly stir the solution with the electrode, and
then hold the sensor probe still until the voltage reading becomes stable.

8
(7) When the voltage reading becomes stable, set the calibration value to "4.01"
by pressing the pH/mV (↑) or (↓) key.
The calibration value is different from the temperature of solution.
The right display is when the pH value of the standard solution at 25°C is
"4.01".
For the relation between the pH value of standard solution and the temperature, refer to the table below. For
example, when the pH standard solution is 40°C, the pH calibration value is "4.04". JIS Z 8802-2011
Standard solution
Name of solution
Temp.
pH value
Temp.
pH value
pH 4
Phthalate solution
0 °C
4.00
30°C
4.02
5 °C
4.00
35°C
4.02
10°C
4.00
40°C
4.04
15°C
4.00
45°C
4.05
20°C
4.00
50°C
4.06
25°C
4.01
-
-
pH 7
Neutral
phosphate solution
0 °C
6.98
30°C
6.85
5 °C
6.95
35°C
6.84
10°C
6.92
40°C
6.84
15°C
6.90
45°C
6.83
20°C
6.88
50°C
6.83
25°C
6.86
-
-
pH 10
Carbonate solution
0 °C
10.32
30°C
9.97
5 °C
10.24
35°C
9.92
10°C
10.18
40°C
9.89
15°C
10.12
45°C
9.86
20°C
10.06
50°C
9.83
25°C
10.01
-
-

9
The table below shows the pH value range to be entered for calibration.
Calibration point
pH value range
pH 4
3.50 to 4.50
pH 7
6.50 to 7.50
pH 10
9.50 to 10.50
Note that it is not possible to perform calibration using the oxalate standard solution (pH 1.68 at 25°C)
or borate standard solution (pH 9.18 at 25°C)
(8) Press the REC key and [SA] is displayed on the LCD to indicate that the
calibration data has been stored in the unit memory.
(9) The unit automatically proceeds to the pH 7 calibration. Perform calibration on pH 7 and pH 10 by using the
same procedure as for pH 4.
The figure above shows the case The figure above shows the case
when the pH 7 standard solution is 25.0°C. when the pH 10 standard solution is 25.0°C
Every data for each pH calibration must be stored in the unit memory by pressing the REC key.
(10) When the pH 10 calibration is complete, "End" is displayed on the LCD.
After approx. 3 seconds, the unit returns to the measurement mode.
When the object to be measured is known as acidity or alkalinity, calibration procedure is omissible.
. When it is acidity: Calibrate on pH4 and pH7. Press the SKIP key to skip the calibration on pH 10
. When it is alkalinity: Calibrate on pH7 and pH10. Press the SKIP key to skip the calibration on pH 4
Note: While in the calibration mode, "CA" and the voltage are displayed on the LCD. When an acid solution is
measured, the voltage value is positive. When an alkaline solution is measured, the voltage value is
negative. Note that in the LCD, the symbol for minus is not displayed. Also, the values displayed are
4-digit numbers; the voltage is displayed such as XXX.X mV.

10
Measuring procedure
(1) Connect the sensor probe to the main unit.
(2) Press the PWR key to turn on the unit. After the whole LCD lights up for approx. three seconds, the unit enters
the measurement mode.
(3) Remove the glass electrode protection bottle from the sensor probe.
(4) Immerse the sensor probe at least 3 cm deep (in use of PHP-31) into the material to be measured.
For the 640S optional probes, refer to the instruction manual of the probe.
(5) Read the pH value when the reading becomes stable.
(6) To end the measurement, press the PWR key to turn off the unit.
Wash the glass electrode with water (distilled, pure or tap water), install the glass electrode protection bottle
and store the instrument.
Precautions
⚫The glass electrode could be damaged or its service life could be shortened if it is used for liquids
such as organic solvents, oils, adhesives, strong acids (pH 0 to 2), strong alkalis (pH 12 to 14) and
surface-active agents.
⚫The pH reading may become unstable when pure water or tap water is measured.
⚫When the pH of a food or drink is to be measured, take a sample (sufficient quantity so that the liquid
junction of the sensor can be submerged) in a separate container for measurement. Do not ingest the
sample after measurement.
⚫The sensor probe is a consumable. It must be replaced with a new one if the electrode is broken, the
performance is degraded or the liquid inside is low. (It is not possible to repair the sensor probe.)
Min/Max Logging mode
Press the REC key while in the measurement mode to store the Min. and Max. pH values after the REC key is
pressed.
NB. In this Min/Max logging mode, switching the unit and calibration are not available.
①Switch the display to the pH value while in the measurement mode and press the REC key.
②[REC] displays and Min/Max logging mode starts. At that time, the time is also displayed and starts counting
up.
③Whenever the REC key is pressed while in the Max/Min logging mode, the max. pH value and min. pH value
are displayed in order. The logged time of the max. pH value and the min. pH are also displayed.
④Press the REC key for three seconds or more to end the Min/Max logging mode. [REC] disappears in the
display section and back to the measurement mode.
Backlight function
SK-620PHII is provided with a backlight function. Pressing the key lights the LCD in green. This permits the
pH readings on the LCD to be read easily even in a dark place.
The backlight is automatically turned off approx. 20 seconds after it is turned on. This prevents the battery power
from being consumed due to continuous use.
About the AC adapter
If the unit will be used for a long period of time, use of the AC adapter is recommended.
Insert the AC adapter plug into the AC adapter jack on the unit

11
About the RS-232C output
⚫RS-232C output
SK-620PHII outputs measured data in real time while in the measurement mode or the MAX/MIN logging
mode. When the unit is connected with a computer, data on the pH (or voltage) and the temperature can be
imported into the computer for analyzing or saving.
Note:The RS-232C cannot be used for output data while in the calibration mode or in the manual
temperature setting mode. We do not supply the transmission/data analysis software.
⚫Connecting the cables
Use the RS-232C communication cable dedicated to this product. The cable is available as an option.
(1) Insert the plug of the optional RS-232C cable all the way into the RS-232C jack on the SK-620PHII.
(2) Next, connect the other side of the cable to the serial port on the computer.
⚫Communication standard and Communications protocol
Transmission speed : 2400bps
Data bit : 8 bits
Stop bit : 1 bit
Parity check : non
Communications protocol
(1) pH display and the temperature (positive) display:
(2) pH display and the temperature (negative) display:
(3) mV display (positive voltage) and the temperature (positive) display
(4) mV display (negative voltage) and the temperature (positive) display
(5) mV display (resolution: 1 mV) and the temperature (positive) display
(6) The sensor probe is not connected (pH display: error, temperature display: 25.0)
Example) When the pH is 7.55 and the temperature is 25.2°C, the RS-232C output is as follows.

12
About the glass electrode
(1) Storage
If the glass electrode becomes dry, it cannot measure the pH accurately.
The pH electrode works best and shows accurate readings when used with moderate moisture. When using
the unit for the first time after purchasing or a long storage period, we recommend placing the glass electrode
in water (distilled, pure or tap water) or the pH standard solution (pH4) for at least 12 hours and performing
calibration before measuring.
(2) Inspection and calibration
For an accurate pH measurement, perform calibration using the pH standard solution. If there is a deviation
from the expected value, adjust it before performing a pH measurement.
Use the new pH standard solutions.
(3) Washing
Be sure to wash the pH electrode after each pH calibration or measurement with water (distilled, pure or tap
water). If left unwashed, the liquid measured tends to form a film on the surface of the electrode, causing
measurement errors. Always wash the pH electrode every time after use.
(4) Useful life
The pH electrode is a consumable. Its useful life varies depending on the liquid to be measured, pH value or
temperature.
(5) Deposit of white potassium chloride crystals
A deposit of white crystals is sometimes found on the tip of the electrode or protection bottle; this does not
pose a problem when using the unit. The deposit is easily washed off with tap water.
If it does not come off with tap water, soak the electrode in warm water to remove it.
Do not lick or swallow the potassium chloride crystals. If the eyes or skin becomes contaminated with the
crystals, immediately consult a doctor.
Troubleshooting (error codes)
Some of the following phenomena may not be considered defective. The symbol "-->" indicates the reference
clauses.
Problem
Possible cause
Action
The power is not turned on.
The battery has run out its power.
Replace with new battery (-->Installing and
replacing battery)
Error code
pH display section
The sensor probe is not
connected to the main unit.
Connect the sensor probe to the main unit.
Securely lock the BNC connector in place.
The glass electrode of the sensor
probe is dirty or dry.
Wash the glass electrode of the sensor probe
and calibrate it. (-->About the glass electrode)
If the problem remains after checking the connection between the main unit and the
probe and after washing the glass electrode, the sample to be measured may be pH
0 or lower.
Error code
pH display section
The sensor probe is not
connected to the main unit.
Connect the sensor probe to the main unit.
Securely lock the BNC connector in place.
The glass electrode of the sensor
probe is dirty or dry.
Wash the glass electrode of the sensor probe.
and calibrate it (-->About the glass electrode)
If the problem remains after checking the connection between the main unit and the
sensor and after washing the glass electrode, the sample to be measured may be
pH 14 or higher.

13
Problem
Possible cause
Action
Error code
Time and voltage
display section
Calibration is not possible.
The pH value set in the calibration
mode and the standard solution pH
value are not same.
Set the same value for the calibration value and
the pH standard solution value (--> Calibration
mode) or wash the glass electrode. (-->About
the glass electrode)
The glass electrode of the sensor
probe is dirty or dry.
Wash the glass electrode of the sensor probe.
(-->About the glass electrode)
The sensor probe is not connected
to the main unit, or the connection
is faulty.
Connect the sensor probe to the main unit.
Securely lock the BNC connector in place.
The pH standard solution is
deteriorated.
Replace the pH standard solution with new
solution.
If the error message still displays after doing the above actions, the sensor probe
may be damaged or deteriorated. Replace the sensor probe to new one.
Readings are unstable.
The sensor is not properly
contacting the sample.
Immerse the sensor probe at least 3 cm from
the tip into the sample solution.
The sample being measured is
pure water with a low electric
conductivity.
For stable pH measurement, choose samples
with an electric conductivity of approx. 100 μ
S/cm or more.
The temperature of the sample
largely fluctuated.
Make the sample temperature stable. The pH
values change with temperature.
Readings are abnormal
The battery has run out.
Replace with new battery. (-->Installing and
replacing battery)
The glass electrode of the sensor
probe is dirty or dry.
Wash the glass electrode. (--> About the glass
electrode)
Calibration has not been
performed.
Perform calibration before measurement.
(-->Before measuring) (-->, Calibration mode)
The sensor is not properly
contacting the sample.
Immerse the sensor probe at least 3 cm from
the tip into the sample solution.
The difference between the sample
temperature and the calibration
temperature is too large.
Perform calibration with a temperature close to
the sample temperature (preferably within
±3°C).
The voltage reading
varies.
The sensor probe is not
connected, or the connection is
faulty.
Connect the sensor probe to the main unit.
Securely lock the BNC connector in place.
The backlight cannot be
turned off.
Once the backlight is turned on, it
cannot be turned off for at least 20
seconds.
The backlight is automatically turned off after 20
seconds. Or, the backlight goes out when the
unit is turned off and on again.
RS-232C communication
is not possible.
The communication conditions or
protocols are not correct.
Check the communication conditions or
protocols. (-->About the RS-232C output)
The serial port on the computer is
not opened.
Check that the serial port is open by referring to
the computer's operation manual.

14
Specifications
Cat. No.
6436-00 Handy type pH meter (without probe)
Model
SK-620PHⅡ
Measuring factors
Hydrogen ion concentration (pH), Liquid temperature (Temperature)
pH
Temperature
Measuring Range
(connecting with PHP-31 probe)
0.00 to 14.00pH
0 to 50°C
Accuracy
(connecting with PHP-31 probe)
±(0.3+1 digit) pH (at 0 to 2pH)
±(0.1+1 digit) pH (at 2 to 12pH)
±(0.4+1 digit) pH (at 12 to 14pH)
±0.5°C (at 20 to 30°C)
±0.7°C (other than above)
Resolution
0.01pH
0.1°C
Elements
Glass electrode 3IN1
Thermistor
Functions
Three point Calibration (pH4.01, pH6.86, pH10.01) at 25°C, Back light,
Auto power-off, Min-Max memory data, Manually temperature setting.
Power Requirement
9VDC Battery 6F22(006P) x 1pc.
Operation ambient
Temperature: 0 to 50°C Humidity: lower than 80%rh no condensing
Battery Life
About 20 hours continuous
Materials
Case: ABS resin Electrode: Glass Probe: Epoxy resin
Dimensions
Main unit: (W)72×(H)182×(D)31.5mm
Probe: Ø12 x 135mm(L) (cord length: 1m)
Weight
About 220g (inclusive of battery)
Standard accessories
Instruction manual, Carrying case, Battery 6F22 (006P) x 1 pc.
Electrode protection bottle, a set of pH standard solution (pH4, pH7, pH10):
about 23ml
. All specifications subject to change with or without notice
. Depending on the optional probe connected, measuring range and accuracy are different.
As for the details, check the manual of each probe.
Options/Consumables
Cat. No.
Model
Descriptions
6400-30
PHP-31
Standard probe
6424-00
640S-1
for General purpose
6425-00
640S-2
for immersion
6425-10
640S-3
for High-alkali
6425-20
640S-4
for Flat surface
6425-30
640S-5
for Test tube
6425-40
640S-6
for Minute amount
6425-90
640S-T
Temperature probe
6426-00
Inner solution for electrode
Set of 3 pcs. (35ml per pc.)
6401-10
Phthalate solution
pH4.01 500ml
6402-10
Neutral phosphate solution
pH6.86 500ml
6403-10
Carbonate Solution
pH10.01 500ml
7687-90
PH33
RS-232C Cable
6400-52
PH30
AC Adaptor