Kedida CT-6821 User manual

深
深圳 圳市 市柯 柯迪 迪达 达电 电子 子有 有限 限公 公司 司
S
SH HE EN NZ ZH HE EN N K KE ED DI ID DA A E EL LE EC CT TR RO ON NI IC CS S C CO O. ., , L LT TD D
1
http://www.kedida.com.cn/
Pen Meter pH & ORP Users Manual
CT-6821
Caution
Please read the manual carefully before using the meter.
The glass electrode at the bottom of the pen is fragile, please use it carefully after taking off the protection cap.
Any damage may cause the invalid of the electrode.
The duration period of the glass electrode is one year from the date of purchase whether you use it or not,
please change the electrode in time.
The electrode can not be used under the dry condition, always soak the electrode into the distilled water or
purified water for 5 –30 minutes to activate before use.
Figure
Part Name
1
Battery Storage Section
2
pH& ORP Display
3
Temperature Display
4
CAL Calibration Key
5
HOLD key
6
Power ON/OF Key
7
Electrode fixed collar
8
Electrode Protection Cap

深
深圳 圳市 市柯 柯迪 迪达 达电 电子 子有 有限 限公 公司 司
S
SH HE EN NZ ZH HE EN N K KE ED DI ID DA A E EL LE EC CT TR RO ON NI IC CS S C CO O. ., , L LT TD D
2 http://www.kedida.com.cn/
FEATURES
* 0.0 to 14.0 pH/0 to ± 500mV
* LCD display with pH and temp. OR ORP and temp.
* Pen type digital pH& ORP meter, all in one,
Electrode is included, easy for general purpose
application
* Data hold function for freezing the desired value
*Water proof and protection
* Auto power off in 5 minutes
* pH 4.01, pH 6.86 and pH 9.18 standard solution are
standard accessories
* Compact size, light weight.
* Easy to change the pH electrode
* Power supply by DC 1.5 V battery (LR44, BAT ) x 4 pcs
* Build in temperature sensor, ATC (auto temperature
compensation)
*℃/ ℉Interchangeable
*Three point calibration for pH 4.0, pH 6.8 and pH 9.1
*Already calibrated, can be used directly
SPECIFICATIONS
Display
LCD, size : 20 mm x 27 mm. Consumption
Measurement Range
pH
0.0 to 14.0 pH
ORP
± 500mV
Resolution
pH
0.1 pH
ORP
± 2mV
Accuracy
pH
± 0.1 pH * After calibration
ORP
± 5mV
pH Calibration
pH4.0,pH6.8, pH9.1,
Three Point Calibration
ORP
Calibration
It already be calibrated before
leaving the factory ; Using it
directly,please.
Temp. Display
0.1℃/1℉
Temp. Accuracy
2℃/5℉
Working Temp. Range
0 ~ 50℃(32 ~ 122℉)
ATC
0 ~ 50℃(32 ~ 122℉)
Dimension
188 x38 mm *Meter with the electrode
Weight
90 g (included electrode)
OPERATING INSTRUCTION
Pull out the cap before using, Do not Screw it!
*Power ON/OFF Feature
1. Press ON/OFF key to turn the Meter on and off.
2. The Meter will shut off automatically if there is no operation in 5 minutes.

深
深圳 圳市 市柯 柯迪 迪达 达电 电子 子有 有限 限公 公司 司
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SH HE EN NZ ZH HE EN N K KE ED DI ID DA A E EL LE EC CT TR RO ON NI IC CS S C CO O. ., , L LT TD D
3 http://www.kedida.com.cn/
*Self- Checking Feature (Executing the function automatically after the meter is power on each time)
1. Press the ON/OFF key to turn on the meter, Self- Checking program will be auto-started with Full screen display.
2. the type of the meter will be displayed: 6821, then , the meter is ready for use.
3. the default mode is pH mode after the date of the manufacture.
4. The test mode will be same with the previous use.
*pH Mode
1. Press the ON/OFF key for 3 seconds, until the “pH”display on the screen.
2. Then press CAL to confirm, and the meter is ready to test in pH mode.
*ORP Mode
1. Press the ON/OFF key for 3 seconds, until the “pH”display on the screen.
2. Press HOLD key to select “ORP”on the screen.
3. Then press CAL to confirm, and the meter is ready to test in ORP mode.
*Backlight Mode
1. Press the ON/OFF key for 3 seconds, until the “pH”display on the screen.
2. Press HOLD key to select “LED”on the screen.
3. Then press CAL to confirm the backlight mode.
4. Power off the meter to close the backlight mode.
*Hold Feature
Press HOLD to freeze the current reading, and „HOLD‟ will be appeared on the LCD. Press HOLD again to release the
hold mode.
*Restore factory defaults
1. If the meter is out of order, Press the HOLD key for 3 seconds, until the “CLR”display on the screen, release the
HOLD key and the factory setting is ready.
2. The meter needs to recalibrate for pH measurement after the factory setting, but can be used directly for ORP
measurement.
*Automatic temperature compensation (ATC)
The product is capable of measuring with automatic temperature compensation when “ATC”displays on the screen.
*℃/℉Interchangeable
The default mode is ℃, press CAL key to switch to ℉.

深
深圳 圳市 市柯 柯迪 迪达 达电 电子 子有 有限 限公 公司 司
S
SH HE EN NZ ZH HE EN N K KE ED DI ID DA A E EL LE EC CT TR RO ON NI IC CS S C CO O. ., , L LT TD D
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http://www.kedida.com.cn/
* Calibration
pH calibration
Prepare for 4 measuring glasses to calibration, 1 measuring glass for water and 3 measuring glasses for pH buffer
solution(pH4.0, pH6.8, pH9.1).
Please be aware of the order of the pH buffer solutions:
First: pH6.8, second: pH4.0, third: pH9.1
Take the pH 6.8 calibration for example:
STEPS
OPRATIONS
1
Insert the electrode into the distilled water or purified water for 10–30 minutes to activate before press
ON/OFF key to turn the meter on.
2
Place the electrode into the measuring glass of water to clean, and wipe it up by tissue
3
Place the electrode into the pH6.8 buffer solution, The pH value will be updated until a stable reading is
reached(The data maybe not accurate if the electrode is not be activated)
4
press CAL key for 3 seconds until the text „CAL‟appear on the display, and release the key
5
Text „SA‟will showing in the LCD denote that the current calibration result is saved
6
The text „END‟will be displayed at the end. The meter is ready for pH measurement
*Overrage Reminder
There will be “1- - .-”on the display if the pH value is under 0 or over 14;
There will be “1- - .-”on the display if the ORP value is under -500mV or over +500mV;
There will be „L‟ or „H‟on the temp. display area if the temperature is under 0℃or over 50℃.
*Low Voltage Reminder
The battery sign will be appeared on the display when battery replacement is needed.
MAINTENANCE
Keep the glass electrode clean, and cover with the protection cap when not use. Be aware of the damage of the
electrode when use it. Products should be kept and stored in a cool, dry place that away from direct sunlight.

深
深圳 圳市 市柯 柯迪 迪达 达电 电子 子有 有限 限公 公司 司
S
SH HE EN NZ ZH HE EN N K KE ED DI ID DA A E EL LE EC CT TR RO ON NI IC CS S C CO O. ., , L LT TD D
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http://www.kedida.com.cn/
WARRANTY
The meter is warranted to be free for one year from the date of purchase. (Electrode and battery are not included)
This warranty covers normal operation and does not cover battery, misuse, abuse, alteration, tampering, neglect,
improper maintenance or damage resulting from leaking batteries. Proof of purchase is required for warranty repairs.
Warranty is void if the meter has been opened.
NOTE
1. Please operate the meter Under the guidance of professionals.
2. Soak the electrode into the distilled water or purified water for 5 –30 minutes to activate before use.
3. Please use the standard buffer solutions for pH calibration, and operate it by the calibration steps shown above.
DO NOT press CAL key in NON calibration mode, it may cause the calibration Error.
4. The pH buffer powder should be fully dissolved in water (250ml).
5. In calibration mode, the electrode should be submerged in the buffer solution. Especially pay attention to the
Electrode fixed collar if it is loosen when calibration, it may cause the buffer solution enter the inside of the
meter.
How to make pH buffer solution
There are 3 pH buffer powder supplied with the meter when you buy them, each powder should be Fully dissolved in
water(250ml). DO NOT use the metal containers.
Take the formulation of pH 6.8 buffer solution for example:
1. Put the pH 6.86 buffer material (in the green sachet) in a jar (the volume should be no less than 250ml).
2. Fill the jar with 250ml distill water.
3. Place a glass stick in the solution, swirling it until the white powder dissolved.
4. Store the buffer solution in the cool and dry place. Attach a label on it for further use.
5. For the further calibration, Ensure that there is a constant supply of fresh buffer solution in contact with the
probe. Discard the solution after use.
The way of the formulation of other buffer is same like that . Please mark it clear and prepare to use it for
the future.
The use of standard buffer：
The buffer solutions (250ml) can be used several times by divided into portions which should be kept in a cool and
dry place(20℃-25℃). Never reuse the used portion. The electrode should be fully covered by buffer solution when
calibration.