Bante920 Benchtop pH/ORP Meter
Instruction Manual
BANTE INSTRUMENTS LIMITED
Bante920 Benchtop pH/ORP Meter
1
Introduction
Thank you for selecting the Bante920 benchtop pH/ORP meter. This manual provides a step-by-step guide to help you operate the meter, please carefully
read the following instructions before use.
UNPACKING THE METER:
Before unpacking, ensure that the current work environment meet following conditions.
● Relative humidity is less than 80%.
● Ambient temperature is greater than 0oC and less than 60oC.
● No potential electromagnetic interference.
The following list describes the standard accessories of the meter. After the unpacking, please check all accessories are complete. If any are damaged or
missing, please contact nearest distributor.
ACCESSORIES:
● pH Electrode
● Temperature Probe
● pH Buffer Pouches (pH4.01/7.00/10.01)
● USB Cable
● DC5V Power Adapter
pH Electrode
Temperature Probe
pH Buffer Pouches
USB Cable
DC5V Power Adapter
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Display
Bante920 benchtop pH meter is equipped with a clear and bright LCD display that used to show measured values, mode indicators and help message. The
following table describes the meaning of each indicator.
INDEX:
Measurement mode indicator:
Indicates meter is in the measurement mode
Electrode slope indicator:
Indicates the average slope of the pH electrode
Calibration mode indicator:
Indicates meter is in the 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 into memory
Calibration Due Reminder:
Prompts user to calibrate the meter regularly
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Keypad
The meter has a succinct membrane keypad, names and symbols describe the each function key controls.
MEAS|
● Power the meter ON/OFF.
● Freezes the measured value on the display, press the key again to resume measuring.
● In the calibration or temperature setting mode, exits current mode and returns to measurement.
MODE|oC
● Toggles between available measurement modes (pH, mV, ORP).
● Press and hold the key to enter temperature setting mode.
CAL|
● Press the key to enter the calibration mode.
● Press and hold the key to enter the setup menu.
MI|
● Press the key to store current measured value.
● Press key in setup mode to scroll up through menu.
● Press key in temperature setting mode to increase the setting values.
MR|
● Press the key to view calibration report or stored data.
● Press key in setup mode to scroll down through menu.
● Press key in temperature setting mode to decrease the setting values.
ENTER
● Confirms the calibration, setting value or displayed option.
● Press and hold the key to turn On/Off the backlight.
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Connectors
Bante920 benchtop pH meter provides 4 connectors for connecting the various types of sensors. Listed in the below table are the details of these
connectors.
INDEX:
NO.
CONNECTOR
FUNCTION
1
pH/ISE
For connecting the pH or ORP electrode
2
ATC
For connecting the temperature probe
3
REF
For connecting the reference electrode
4
USB/
For connecting the USB cable and DC5V power adapter
Connecting the Electrode Holder
The meter comes with an easy-to-use holder for mounting a variety of sensors and temperature probe. If necessary, please follow the steps below to install
the electrode holder.
1. The base of the electrode holder with an irregular round hole.
2. The electrode arm has a plastic rod.
COND REFpH/ISE DOATC USB/
1
Plastic Rod
2 3 4
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3. Insert the plastic rod into the irregular round hole and swivel the electrode arm 90o. Electrode holder is now ready to swing into desired position.
ADJUSTMENT OF ELECTRODE ARM:
After installation, if the electrode arm automatically rises or falls, you need to adjust the screws until arm locate at any position.
1. Remove the plastic cover from the electrode arm.
2. Use the screwdriver to tighten the screw moderately.
3. Insert the plastic cover to previous position. Installation is completed.
Connecting the Electrode
1. Take out the pH or ORP electrode from the packaging. Follow the steps below to place the electrode into left or right sides of the electrode arm.
2. Insert the BNC connector into the corresponding connector socket. Rotate and push the connector clockwise until it locks. After connection is
completed, DO NOT pull on the sensor cord. Always make sure that the connector is clean and dry.
Screws
A. Insert the electrode
B. Hook up the cord
C. Hook up the cord
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Preparing the pH Buffer Solutions
Bante920 benchtop pH meter is packaged with three pH buffer packets required for calibration.
● Open the pH7.00 buffer packet, place the powder into a 250ml volumetric flask. Pour distilled water 250ml to scale line, mix the solution until
reagent is completely dissolved.
● Preparation of pH4.01 and 10.01 standard buffer solutions are the same as above.
● Prepared standard buffer solutions should be stored in hermetically sealed glass containers.
Prior to Use
Remove the protective cap from the bottom of the electrode.
FOR THE pH ELECTRODE:
If the glass sensitive membrane on the electrode dries out, soak the sensor in 3M KCL solution or tap water for at least 15 minutes. DO NOT use distilled or
deionized water, it will shorten the life of sensor.
FOR THE ORP ELECTRODE:
Soak the electrode in 4M KCL solution or tap water for at least 15 minutes.
Power On/Off
● Press MEAS key to turn on the meter, the display shows measured values, mode indicators and help messages.
● Press and hold the MEAS key for 3 seconds, the meter will turn off.
● If you do not press any key within the specified time period, the meter will turn off automatically.
To disable the auto-off function, please read the SETUP MENU section.
……..…. Glass Sensitive Membrane
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Setup Menu
Bante920 benchtop pH meter contains an integrated setup menu that allows you to customize each displayed option to meet measurement requirements. In
the different modes, the meter will show the corresponding options. For the general options, once it is changed that will be applied to all modes.
pH MODE:
PARAMETER
DESCRIPTION
OPTIONS
DESCRIPTION
DEFAULT
pH Buffers:
Select your desired pH buffer group for calibration
and auto-recognition.
USA (1.68, 4.01, 7.00, 10.01, 12.45)
●
NIST (1.68, 4.01, 6.96, 9.18, 12.45)
DIN (1.09, 4.65, 6.79, 9.23, 12.75)
User-Defined Buffer
Calibration Points:
Select the number of calibration points you intend
to calibrate the meter.
1 point
2 points
3 points
●
4 points
5 points
Resolution:
Sets the resolution for pH measurement.
0.001pH
●
0.01pH
0.1pH
Measurement Unit:
Sets the default temperature unit.
Degrees Celsius
●
Degrees Fahrenheit
ORP MODE:
PARAMETER
DESCRIPTION
OPTIONS
DESCRIPTION
DEFAULT
Resolution:
Sets the resolution for ORP measurement.
0.1mV
●
1mV
GENERAL OPTIONS:
PARAMETER
DESCRIPTION
OPTIONS
DESCRIPTION
DEFAULT
Stability 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.
Low
●
High
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Auto-Hold:
When the auto-hold function is enabled, the meter
will automatically sense a stable end-point reading
and freeze it.
Enable
Disable
●
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 minutes
20 minutes
30 minutes
Disable
●
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 to 31 days
Disable
●
Date and Time:
Sets the date and time of the meter.
---
---
Clear stored data:
Clear all stored data.
Enable
Disable
●
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.
Enable
Disable
●
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 key for 3 seconds, the meter enters setup menu, the display shows selectable parameter and page number.
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3. Press or key to scroll through menu, select the parameter you want to set (Refer to Setup Menu section).
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 key to confirm, the meter returns to measurement mode. Setting is completed.
EXIT THE SETUP MENU:
During the setup mode, press MEAS key, the meter returns to measurement mode immediately.
…………Parameter
…………Page number
…………Parameter
…………Option
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Setting the Date and Time
Bante920 benchtop pH meter has a real time clock that is used to time-stamp stored measured value and calibration data. Follow the steps below to set
the date and time during the first use.
1. Press and hold the key for 3 seconds to enter the setup menu.
2. Press or key until the display shows “DATE” option.
3. Press ENTER key to confirm, the meter shows current year.
4. Press or key to set the year.
5. Press ENTER key to confirm, the meter shows current date and time.
…………Year
…………Format: Month - Day
…………Format: Hour - Minutes
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6. Press or key to set the date and time.
7. Press ENTER key to confirm, the meter returns to measurement mode. Setting is completed.
Temperature Compensation
In order to get accurate measuring results, you need to enable the manual or automatic temperature compensation before measurement or calibration.
AUTOMATIC TEMPERATURE COMPENSATION:
● Place the temperature probe into the circular hole of electrode arm.
● Insert the connector of temperature probe into corresponding connector socket (Marked “ATC”).
● The “ATC” indicator will show on the display, the meter is now switched to automatic temperature compensation mode.
MANUAL TEMPERATURE COMPENSATION:
1. DO NOT connect the temperature probe to meter.
2. Press and hold the oC key for 3 seconds to enter temperature setting mode.
3. Press or key to set the temperature value of sample.
4. Press ENTER key to confirm, the meter returns to measurement mode. Setting is completed.
In the temperature setting mode, press or key once, the setting value will increase or decrease by 0.1. Press and hold the or key, the
setting value will increase or decrease by 1.
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pH Calibration
Bante920 benchtop pH meter allows up to 5 points calibration in the pH mode. We recommend that you perform at least 2 points calibration for high
accuracy measurement. The meter will automatically recognize and calibrate to following standard buffer values.
USA Standard Buffer Options
pH1.68, 4.01, 7.00, 10.01, 12.45
NIST Standard Buffer Options
pH1.68, 4.01, 6.86, 9.18, 12.45
DIN Standard Buffer Options
pH1.09, 4.65, 6.79, 9.23, 12.75
If you selected the user-defined option in the setup menu, the meter will allow only 2 points calibration. Single point calibration should only be carried out
with pH7.00, 6.86 or 6.79, otherwise calibration will not be accepted.
Make sure to calibrate the meter when attaching a new electrode or during first use. DO NOT reuse calibration solution after calibration, contaminants in
solution will affect the calibration and eventually the accuracy of the measurement.
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”).
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.
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MULTI-POINT CALIBRATION:
2.1 Make sure that you have selected 2 to 5 points calibration in the setup menu.
2.2 Repeat steps 1.2 to 1.5 above. When the first calibration point is completed, the display will show “CAL2”. The meter prompts you to continue with
second point calibration.
2.3 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.
2.4 Wait for the measured value to stabilize, the display shows “CAL3”. The meter prompts you to continue with third point calibration.
2.5 Repeat the steps 2.3 until the display shows “END”. The meter returns to measurement mode automatically. Calibration is completed.
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pH CALIBRATION WITH THE USER-DEFINED BUFFERS:
3.1 Make sure that you have selected “USER” option in the setup menu. Custom buffer solution values should be at least 1 pH unit apart from each
other.
3.2 Rinse the pH electrode with distilled water. Dip the electrode into the custom buffer solution. Stir the sensor gently. The meter shows the current
measured value.
3.3 Press or key to increase or decrease displayed value, press ENTER key to confirm. “Calibration” indicator begins flashing.
3.4 Wait for the measured value to stabilize, the display shows “CAL2”. The meter prompts you to continue with second point calibration.
3.5 Rinse the pH electrode with distilled water. Dip the electrode into the next custom buffer solution.
3.6 Press or key to increase or decrease displayed value, press ENTER key to confirm. “Calibration” indicator begins flashing.
3.7 Wait for the measured value to stabilize, the display shows “END”. The meter automatically returns to measurement mode. Calibration is completed.
● During the calibration process, if you want to exit the calibration mode, press MEAS key, the meter will return to measurement mode immediately.
● Electrode indicator shows average slope of the pH electrode after calibration. When the electrode or calibration result does not meet measurement
requirements, the indicator will disappear on the display.
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pH Calibration Report
This program lets you check the parameters of pH electrode for diagnostic purposes.
1. Press MR key in the pH measurement mode, the display shows “LOC/P-01”.
2. Press or key until the meter shows “ELE/P-02” (Electrode Diagnosis).
3. Press ENTER key to confirm, the meter shows the last calibration date (Format: mm-dd).
4. Press key, the meter shows “OFS” (zero-point offset potential).
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5. Press key again, the meter shows the slope of each pH buffer group.
6. After the browsing, press MEAS key to exit the currect mode.
If you are not calibrate the meter or calibration is not successfully, press MR key, the display will show "----" only.
….......Calibration Points
….......Slope
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ORP Calibration
Bante920 benchtop pH meter allows 1 point calibration in the relative mV mode, but calibration is not necessary unless exact readout agreement with a
work standard and at a specific ORP value is needed.
1. Press MODE key until the meter shows 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 key to confirm. “Calibration” indicator begins flashing.
5. Wait for the measured value to stabilize, the display shows “END”. The meter returns measurement mode automatically. Calibration is completed.
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ORP Calibration Report
This program lets you check the millivolt offset in the ORP mode.
1. Press MR key in the ORP measurement mode, the display shows “LOC/P-01”.
2. Press or key until the meter shows “ELE/P-02” (Electrode Diagnosis).
3. Press ENTER key to confirm, the meter shows the last calibration date (Format: mm-dd).
4. Press key, the meter shows “OFS” (Offset Potential).
5. After the browsing, press MEAS key, the meter returns to measurement mode.
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Temperature Calibration
During the measurement, when automatic temperature compensation is enabled, if the temperature reading displayed differs from that of an accurate
thermometer, you need to calibrate the meter.
1. Press and hold the oC key for 3 seconds to enter temperature calibration mode, the display shows current temperature reading.
2. Press or key to set the temperature value.
3. Press ENTER key to confirm. Calibration is completed.
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pH Measurement
1. Press MODE key until the meter shows 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
Bante920 benchtop pH meter contains two millivolt measurement modes.
ABSOLUTE MILLIVOLT MODE:
● Press MODE key until the display shows measurement unit “mV”, the meter is now enters absolute millivolt measurement mode.
RELATIVE MILLIVOLT MODE:
● Press MODE key until the display shows indicator, the meter enters relative millivolt measurement mode.
Select one of the above modes. Dip the ORP electrode into sample solution, stir the sensor gently. Wait for the reading to stabilize, record the measured
value on the display.
Hold Function
The meter contains two data hold modes. When the Auto-Hold function is enabled, the meter will automatically sense a stable endpoint reading and freeze it,
“HOLD” indicator appears on the display. If the Auto-Hold function is disabled, press key, the meter will immediately freeze currently displayed value.
Press the key again to resume measuring.
mV
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Storing and Recalling Data from Memory
Bante920 benchtop pH meter allows up to 500 data sets to be stored and recalled.
MEMORY INPUT:
During the measurement process, press MI key to input measured value into the memory, “Memory” indicator appears on the display.
MEMORY RECALL:
1. Press MR key in the measurement mode, the meter shows “LOC/P-01” (Data Log).
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2. Press ENTER key to confirm, the meter shows page number of the stored data.
3. Press key, the meter shows date and time of the stored data (Format: mm-dd, hh-mm).
4. Press key again, the display shows the stored data.
5. After the browsing, press MEAS key to exit the current mode.
..…..…...Page number
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Communication
Bante Instruments provides a free Data Acquisition System that can be used to transfer data, receive the measuring values or import the data to Excel.
Before using, ensure that Windows 7/8/10 operating system has been installed on your computer.
RECEIVING DATA:
● Connect the USB cable to meter and computer. Click the DAS icon, the system will automatically scan an available communication port and show
the message box “ Found a port on your computer”.
● Click the OK button, the application starts.
● Click the Connect button, the screen shows “Port is connected” indicate that communication between the meter and the computer has been
established.
● Click the OK button to confirm.
● Click the Receive button, the stored data in meter will automatically send to computer.
INTERVAL RECORDING:
This function helps you to record the measuring value within the specify time period.
● Click the Interval Recording button and select a time option.
● Click the Receive button, the measured value will automatically send to data sheet.
● The first data need 1 minute to be shown on screen.
● Do not press any key on meter during the Interval Recording mode, it will cause communication interruption.
GRAPH MODE:
This function helps you to view variations of the measured parameter continuously. Click the Graph button, the screen will immediately show curve graph. If
you want to quit current mode, click the Back button.
CREATE THE EXCEL FILE:
When the transfer is completed, click the “Save as Excel” button, the measured values in the data sheet will automatically convert to Excel file.
WARNING:
Once the software is closed, all received data will be lost and can not be recovered.
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pH Electrode 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:
● Salt deposits: Soak the electrode in warm tap water to dissolve deposits, then thoroughly rinse with distilled water.
● 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.
● Clogged reference junction: Heat a diluted KCl solution to 60 oC to 80oC. 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.
● 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.
● Soak the pH electrode in 0.1M HCl for 5 minutes.
● Remove and rinse with deionized water, then place in 0.1M NaOH for 5 minutes.
● Remove and rinse again, and soak in electrode storage solution for 30 minutes.
ORP Electrode Care and Maintenance
● Ensure that the ORP electrode is thoroughly washed with distilled water after each use.
● In aggressive chemicals, dirty or viscous solutions, and solutions with heavy metals or proteins, take readings quickly and rinse electrode immediately
after.
● 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:
● Soak the ORP electrode in 0.1M HCl for 10 minutes.
● Remove and rinse with distilled water, then place in alcohol for 5 minutes.
● Remove and rinse again, and soak in pH4.01 buffer solution for 15 minutes.
Oil and Grease Films:
● Wash the electrode gently in some detergents and water.
● Dip the electrode in the electrode storage solution for at least 30 minutes.
HOW TO PREPARE THE ELECTRODE STORAGE SOLUTION:
Dissolve 22.365 grams of potassium chloride reagent (KCL) in the 100mL distilled water. Stir the solution until the solution has thoroughly mixed.
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Optional pH Electrodes
Bante920 benchtop pH meter is equipped with a general purpose pH electrode, if it can not fully meet your measurement requirements, please refer to the
table below to select an applicable sensor.
SAMPLE TYPE
P11
P12
P13
P14
P16
P17
P18
P19
P20
P21
Agar
● Beer
● ● ●
● ●
●
●
Blood Products
● ● ●
● ● Bread, Dough
●
●
Cement ●
Cosmetics
● ● ●
● ●
● Dairy Products
● ● ●
● ● Education ●
● ●
●
Fats/Cream
● Field Use
●
●
● ●
Fish Products
● ● Lab Flasks
● Low Ionic ●
● Meat, Cheese
● ● Micro Samples
●
Paint
●
●
● Photographic
Soil
●
●
Surface
● Test Tubes
●
●
Tris Buffer
●
Viscose Samples
●
Troubleshooting
LCD DISPLAY
CAUSE
CORRECTIVE ACTION
Electrode dried out
Soak the pH electrode in 3M KCL solution for 10 minutes
Measured value is out of range
Check the electrode whether clogged, dirty or broken
Incorrect pH buffer solutions
Using the fresh pH buffer solutions for calibration
Electrode is out of service life
Replace the pH electrode
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Specifications
pH
Model
Bante920
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 or 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
Calibration Points
1 point (Only for Relative mV mode)
Calibration Range
± 200mV
Temperature
Range
0~105°C, 32~221°F
Accuracy
± 0.5°C, ± 0.9°F
Resolution
0.1°C
Calibration Points
1 point
Calibration Range
Measured value ± 10°C
Others
Hold Function
Manual or Automatic
Stability Conditions
Low or High
Calibration Due
0 to 31 days
Power Off
Manual or Automatic (10, 20, 30 minutes)
Reset Function
Yes
Memory
Stores up to 500 data sets
Output
USB Communication Interface
Connector
BNC
Display
LCD
Power Requirements
DC5V, using AC adapters, 220VAC/50Hz
Dimensions
210(L)× 188(W)× 60(H)mm
Weight
1.5kg
Hazardous Substance Statement
Bante Instruments Limited is committed to the reduction and eventual elimination of all hazardous substances in both the manufacturing process and finished
products we supply. We have an active manufacturing and procurement program to minimize and eliminate the use of harmful heavy metals such as cadmium,
lead, mercury and the like. New technologies and design parameters are also promoting these efforts and we expect to have little or no such materials in our
product in the coming years. We welcome our customer suggestions on how to speed up these efforts.
Warranty
The warranty period for meter is one year from the date of shipment. Above warranty does not cover sensor and calibration solutions. Out of warranty
products will be repaired on a charged basis. The warranty on your meter shall not apply to defects resulting from:
● Improper or inadequate maintenance by customer.
● Unauthorized modification or misuse.
● Operation outside of the environment specifications of the products.
For more information, please contact the nearest authorized distributor.
BANTE INSTRUMENTS LIMITED
E-mail: banteinstruments@yahoo.com
Phone: +8621-6404-1598
Website: www.bante-china.com
The information in this document is subject to change without notice. Copyright © Bante Instruments Limited, 2015. All rights reserved.
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