Kensington KS-PH-221-DELUXE User manual

User Manual
KS-PH-221-DELUXE |
Portable pH/ORP Meter
Deluxe
Kensington Scientific
22a Cavan Rd, Dry Creek
South Australia, 5094
[e-mail]
www.kensingtonscientific.com.au
OVERVIEW
Below are the steps you need to follow to begin using your Kensington KS-PH-221-DELUXE portable pH/mV meter.
This manual provides a step-by-step guide to help you operate the meter.
METER CONTENTS
The following are included as standard accessories of the KS-PH-221-DELUXE:
1. pH electrode
2. TP-100K Temperature Probe
3. pH Buffer Solutions (pH4.01/7.00/10.01)
4. Batteries

User Manual
KS-PH-221-DELUXE |
Portable pH/ORP Meter
Deluxe
Kensington Scientific
22a Cavan Rd, Dry Creek
South Australia, 5094
[e-mail]
www.kensingtonscientific.com.au
DISPLAY
The KS-PH-221-DELUXE is built with a large and clear LCD display that shows measured values, mode indicators and
notifications. The following table describes the meaning of each icon on the screen.
Measurement mode indicator:
Indicates meter is in the measurement mode
Electrode strobe indicator:
Indicates the average slope of the pH
electrode
Calibration mode indicator:
Indicates meter is in calibration mode
Stable indicator:
Indicates the measured value has stabilized
Setup mode indicator:
Indicates meter is in setup mode
Hold indicator:
Indicates the displayed value has been
frozen
Memory mode indicator:
Indicates data is stored in the memory
Calibration Due Reminder:
Prompts the user to calibrate the meter
Low battery alarm:
This indicator will disappear if the battery is
depleted
Automatic temperature compensation:
Indicates that temperature compensation is
active

User Manual
KS-PH-221-DELUXE |
Portable pH/ORP Meter
Deluxe
Kensington Scientific
22a Cavan Rd, Dry Creek
South Australia, 5094
[e-mail]
www.kensingtonscientific.com.au
KEYPAD
The KS-PH-221-DELUXE has six (6) multi-function keys. Below are their names and functions
MEAS
1. Power button of the meter
2. Press once during measurement mode to activate data hold function.
3. Exit button during calibration or temperature setting mode.
MODE
1. Toggles between the different available measurement modes (pH, mV, ORP, Ion, Conductivity,
TDS, Salinity, Resistivity and DO)
2. Press and hold to activate temperature setting mode
CAL
1. Press to enter calibration mode
2. Press and hold to enter setup mode
MI
1. Press the key to store the current measured value
2. Press ▲ in setup mode to scroll up the menu
2. Press ▲ in temperature setting mode to increase the settings value
MR
1. Press to view calibration report or stored data
2. Press ▼ in setup mode to scroll down the menu
3. Press ▼ in temperature setting mode to decrease setting values
ENTER
1. Confirms the calibration, setting value or displayed option
2. Press and hold the key to turn On/Off the back light.
CONNECTORS
The KS-PH-221-DELUXE provides two for connecting the various types of sensors. Listed in the below table are the
details of these connectors.
NO.
Connector
Function
1
BNC Connector
Slot for the pH, ORP or Ion selective electrodes
2
Phone jack
Slot for the temperature probe

User Manual
KS-PH-221-DELUXE |
Portable pH/ORP Meter
Deluxe
Kensington Scientific
22a Cavan Rd, Dry Creek
South Australia, 5094
[e-mail]
www.kensingtonscientific.com.au
PREPARING THE pH BUFFER SOLUTIONS
The KS-PH-221-DELUXE comes with three pH buffer packets needed for calibration.
1. Begin by opening the packet for the 7.00 buffer. Pour distilled water into a 250 ml volumetric flask up to the scale
line. Mix the solution until the reagent is dissolve.
2. Do the same for the pH 4.01 and pH 10.01 packets.
3. You will need only a small amount of calibration solution during calibration. Get the require solution from the flask
and store the rest.
4. Do not reuse used solutions.
SETUP MENU
The KS-PH-221-DELUXE has integrated set-up menus for each of the parameters it can measure. Below is a guide
showing the available options for each parameter, the available options and their description.
pH MODE
PARAMETER
DESCRIPTION
OPTIONS
DESCRIPTION
BUF
pH buffers:
Select your desired pH buffer for
calibration and auto-recognition
USA (Default)
USA (1.68, 4.01, 7.00,
10.01, 12.45)
NIST
NIST (1.68, 4.01, 6.96,
9.18, 12.45)
DIN
DIN (1.09, 4.65, 6.79, 9.23,
12.75)
USER
User-Defined Buffer
CAL
Calibration Points:
Select the desired number of
calibration points
1
1 point
2
2 points
3 (Default)
3 points
4
4 points
5
5 points
RESO
Resolution:
Sets the resolution for pH
measurement
0.001 (Default)
0.001 pH
0.01
0.01 pH
0.1
0.1 pH
UNIT
Measurement unit:
Sets the default temperature unit
°C (Default)
Degrees Celsius
°F
Degrees Fahrenheit
ORP MODE
PARAMETER
DESCRIPTION
OPTIONS
DESCRIPTION
RESO
Resolution:
Sets the resolution for pH
measurement
0.1
0.1 mV
1
1 mV

User Manual
KS-PH-221-DELUXE |
Portable pH/ORP Meter
Deluxe
Kensington Scientific
22a Cavan Rd, Dry Creek
South Australia, 5094
[e-mail]
www.kensingtonscientific.com.au
GENERAL OPTIONS
PARAMETER
DESCRIPTION
OPTIONS
DESCRIPTION
STA
Stable Criteria:
Sets the stability criteria for
measurement. When the “LO” option is
enabled, measuring value will stabilize
quickly, but reading is less accurate.
When the “HI” option is enabled,
measuring value will stabilize slowly,
but guarantees high accuracy
LO (Default)
Low
HI
High
HOLD
Auto-Hold:
When the auto-hold function is
enabled, the meter will automatically
sense a stable end-point reading and
freeze it.
YES
Enable
NO (Default)
Disable
OFF
Auto-Power Off:
When the auto-off power is enabled, if
you do not press any key within a
specified time period, the meter will
automatically turn off.
10
10 minutes
20
20 minutes
30
30 minutes
NO (Default)
Disable
CALL
Calibration Due:
When calibration due reminder is
enabled, if you do not recalibrate meter
within a specified time period, the
meter will automatically show
indicator.
1…31
1 to 31 days
OFF (Default)
Disable
CLR
Clear stored data:
Clear all stored data
YES
Enable
NO (Default)
Disable
RST
Reset:
Reset function allows user to restore
the meter back to factory default
parameters. When this function is
enabled, all calibration values and
selected parameters will be lost or
reset.
YES
Enable

User Manual
KS-PH-221-DELUXE |
Portable pH/ORP Meter
Deluxe
Kensington Scientific
22a Cavan Rd, Dry Creek
South Australia, 5094
[e-mail]
www.kensingtonscientific.com.au
SETTING THE DEFAULT PARAMETERS
1. If necessary, press MODE key until the display shows corresponding mode indicator (e.g., pH mode).
2. Press and hold the CAL key for 3 seconds, the meter enters setup menu, and the display shows selectable
parameter and page number.
3. Press ▲ or ▼ key to scroll through menu, select the parameter you want to set (Refer to Setup Menu section).

User Manual
KS-PH-221-DELUXE |
Portable pH/ORP Meter
Deluxe
Kensington Scientific
22a Cavan Rd, Dry Creek
South Australia, 5094
[e-mail]
www.kensingtonscientific.com.au
4. Press ENTER key to confirm, the display shows an option in the submenu
5. Press ▲ or ▼key to select the desired option
6. Press ENTER to confirm. The meter should return to measurement mode.
SETTING THE DATE AND TIME
Setting the date and time are important as they are used to time-stamped stored measured values and calibration data.
Follow the instructions below to set the time and date.
1. Press and hold the CAL key for 3 seconds to enter the setup menu.
2. Press ▲ or ▼ key until the display show the ‘DATE’ option
3. Press ENTER to confirm. The meter should now display the current year.

User Manual
KS-PH-221-DELUXE |
Portable pH/ORP Meter
Deluxe
Kensington Scientific
22a Cavan Rd, Dry Creek
South Australia, 5094
[e-mail]
www.kensingtonscientific.com.au
4. Press ▲ or ▼ to set the year
5. Press ENTER key to confirm, the meter should now show the current data and time.
TEMPERATURE COMPENSATION
Temperature compensation is an important feature of the KS-PH-221-DELUXE for accurate measuring results.
Temperature compensation will automatically activate when you insert the temperature probe into the meter’s phone
jack. You will know temperature compensation is activated as the ‘ATC’ indicator will be present on the display.
pH CALIBRATION
The KS-PH-221-DELUXE allows up to five (5) points calibration in pH mode. It is recommended to perform at least two
(2) points calibration to ensure accurate measurements. The meter can already automatically identify and calibrate the
following standard buffer values:
SINGLE POINT CALIBRATION:
1.1 Make sure that you have selected 1 point calibration in the setup menu.
1.2 Rinse the pH electrode with distilled water.
1.3 Press CAL key, the meter shows “pH7.00/CAL” (or “6.86/CAL”, “6.79/CAL”).

User Manual
KS-PH-221-DELUXE |
Portable pH/ORP Meter
Deluxe
Kensington Scientific
22a Cavan Rd, Dry Creek
South Australia, 5094
[e-mail]
www.kensingtonscientific.com.au
1.4 Dip the pH electrode into the pH7.00 (or 6.86, or 6.79) buffer solution, the end of the electrode must be completely
immersed into the calibration solution. Stir the sensor gently to create a homogenous solution.
1.5 Press ENTER key, “Calibration” indicator begins flashing. Wait for the measured value to stabilize, the display
shows “END”. The meter returns to measurement mode automatically. Calibration is completed.
MULTI-POINT CALIBRATION
2.1 Make sure to select the desired calibration point between two to five (2-5) in the setup menu. Three points
calibration is recommended as a default calibration option.
2.2 Repeat steps 1.2 to 1.5 above.
2.3 When the first calibration point is completed, the display will show “CAL2”. The meter prompts you to continue with
second point calibration.
2.4 Rinse the pH electrode with distilled water. Dip the electrode into the next standard buffer solution (e.g., pH4.01).
The meter automatically senses the current calibration solution and begins calibrating. “Calibration” indicator
begins flashing.

User Manual
KS-PH-221-DELUXE |
Portable pH/ORP Meter
Deluxe
Kensington Scientific
22a Cavan Rd, Dry Creek
South Australia, 5094
[e-mail]
www.kensingtonscientific.com.au
2.5 Wait for the measured value to stabilize, the display shows “CAL3”. The meter prompts you to continue with third
point calibration. Remember to change the buffer solution to pH 10.01
2.6 For four point and five point calibration points, other buffer solutions may be needed.
2.6 Repeat the steps 2.4 to 2.5 until the display shows “END”. The meter returns to measurement mode automatically.
Calibration is completed.

User Manual
KS-PH-221-DELUXE |
Portable pH/ORP Meter
Deluxe
Kensington Scientific
22a Cavan Rd, Dry Creek
South Australia, 5094
[e-mail]
www.kensingtonscientific.com.au
ORP CALIBRATION
The KSPH-221-DELUXE meter allows one point calibration for ORP measurement. This procedure is not required
unless exact readout agreement with a work standard and at a specific ORP value is needed.
1. Press the MODE key until you see the ORP indicator
2. Rinse the ORP electrode with distilled water. Dip the electrode into the calibration solution. Stir the sensor gently.
3. Press CAL key, the meter shows the current measured value.
4. Press ▲ or ▼ key to set the displayed value. Press ENTER to confirm. The calibration indicator should begin to
flash.
5. Wait for the measured value to stabilize, the display shows “END”. The meter returns measurement mode
automatically. Calibration is completed.

User Manual
KS-PH-221-DELUXE |
Portable pH/ORP Meter
Deluxe
Kensington Scientific
22a Cavan Rd, Dry Creek
South Australia, 5094
[e-mail]
www.kensingtonscientific.com.au
MEASUREMENT MODES
pH MEASUREMENT
1. Press the MODE key until the meter shows the pH indicator
2. Rinse the pH electrode with distilled water to remove any impurities adhering to the probe body.
3. Dip the electrode into the sample solution, stir the sensor gently.
4. Wait for the reading to stabilize, record the measured value on the display.
ORP MEASUREMENT
ABSOLUTE MILLIVOLT MODE
Press the MODE key until the display shows measurement unit “mV”, the meter is now enters absolute millivolt
measurement mode.
RELATIVE MILLIVOLT MODE
Press the MODE key until the display shows measurement unit “ORP”, the meter is now enters relative millivolt
measurement mode.

User Manual
KS-PH-221-DELUXE |
Portable pH/ORP Meter
Deluxe
Kensington Scientific
22a Cavan Rd, Dry Creek
South Australia, 5094
[e-mail]
www.kensingtonscientific.com.au
PHELECTRODE CARE AND MAINTENANCE
Since pH electrode is susceptible to dirt and contamination, clean as necessary depending on the extent and condition
of use.
AFTER MEASURING:
Rinse the pH electrode in distilled water, store the electrode into the electrode storage solution.
CLEANING THE ELECTRODE:
1. Salt deposits: Soak the electrode in warm tap water to dissolve deposits, then thoroughly rinse with distilled water.
2. Oil or Grease film: Wash the electrode bulb gently in some detergents and water. If necessary, using the alcohol to
clean the electrode bulb, then rinse with distilled water. Place the sensor in the electrode storage solution for 30
minutes.
3. Clogged reference junction: Heat a diluted KCl solution to 60 to 80 degrees Celsius. Place the sensing part of the
electrode into the heated solution for about 10 minutes. Allow the electrode to cool in some unheated KCl solution.
4. Protein deposits: Prepare a 1% pepsin solution in 0.1M of HCL. Place the electrode in the solution for 10 minutes.
Rinse the sensor with distilled water.
REACTIVATING THE ELECTRODE:
If stored and cleaned properly, the electrode should be ready for immediate use. However, a dehydrated bulb may
cause sluggish response. To rehydrate the
bulb, immerse the electrode in a pH4.01 buffer solution for 10 to 30 minutes. If this fails, the electrode requires
activation.
1. Soak the pH electrode in 0.1M HCl for 5 minutes.
2. Remove and rinse with deionized water, then place in 0.1M NaOH for 5 minutes.
3. Remove and rinse again, and soak in electrode storage solution for 30 minutes.
ORP ELECTRODE CARE AND MAINTENANCE
1. Ensure that the ORP electrode is thoroughly washed with distilled water after each use.
2. In aggressive chemicals, dirty or viscous solutions, and solutions with heavy metals or proteins, take readings
quickly and rinse electrode immediately after.
3. If you do not use the electrode for long periods, please store the electrode with electrode storage solution.
CLEANING THE ELECTRODE:
Contamination of the sensing element often results in slow response and inaccurate readings. If necessary, clean the
element by one of the following procedures.
INORGANIC DEPOSITS:
1. Soak the ORP electrode in 0.1M HCl for 10 minutes.
2. Remove and rinse with distilled water, then place in alcohol for 5 minutes.
3. Remove and rinse again, and soak in pH4.01 buffer solution for 15 minutes.
OIL AND GREASE FILMS:

User Manual
KS-PH-221-DELUXE |
Portable pH/ORP Meter
Deluxe
Kensington Scientific
22a Cavan Rd, Dry Creek
South Australia, 5094
[e-mail]
www.kensingtonscientific.com.au
4. Wash the electrode gently in some detergents and water.
5. Dip the electrode in the electrode storage solution for at least 30 minutes.
SPECIFICATIONS
pH
Range
-2.000~20.000pH
Accuracy
± 0.002pH
Resolution
0.1, 0.01, 0.001pH
Calibration points
1 to 5 points
Calibration solutions
USA, NIST, DIN, User-Defined
Buffer
Temperature compensation
0~100°C, 32~212°F, Manual or
Automatic
mV
Range
-1999.9~1999.9mV
Accuracy
± 0.2mV
Resolution
0.1, 1mV
pH
Calibration Points
1 point (Only for Relative mV mode)
Calibration Range
± 200mV
Range
-2.000~20.000pH
Others
Hold function
Manual
Memory
500 data sets
Output
USB interface
Connector
BNC
Power requirements
1× 9V/800mA Battery
Dimensions
185(L)× 88(W)× 32(H)mm
Weight
300g