SEN0161

SEN0161 Datasheet

PH meter SKU SEN0161

Part	Datasheet
SEN0161	SEN0161 (pdf)

Related Parts	Information
SEN0169	SEN0169

PDF Datasheet Preview
PH meter SKU SEN0161 Analog pH Meter Kit SKU SEN0161 Analog pH Meter Kit SKU SEN0169 Contents • 1 Introduction • 2 Specification • 3 Precautions • 4 pH Electrode Characteristics • 5 Usage Connecting Diagram Method Software Calibration Method Hardware Calibration through potentiometer • 6 FAQ Introduction Need to measure water quality and other parameters but haven't got any low cost pH meter? Find it difficult to use with Arduino? Here comes an analog pH meter, specially designed for Arduino controllers and has built-in simple, convenient and practical connection and features. It has an LED which works as the Power Indicator, a BNC connector and PH2.0 sensor interface. You can just connect the pH sensor with BNC connector, and plug the PH2.0 interface into any analog input on Arduino controller to read pH value easily. Specification SEN0161 dimension • Module Power 5.00V • Circuit Board Size 43mmx32mm • pH Measuring Range 0-14 • Measuring Temperature 0-60 • Accuracy ± 0.1pH 25 • Response Time 1min • pH Sensor with BNC Connector • PH2.0 Interface 3 foot patch • Gain Adjustment Potentiometer • Power Indicator LED Precautions • Before and after use of the pH electrode every time, you need to use pure water to clean it. • The electrode plug should be kept clean and dry in case of short circuit. • Preservation Electrode reference preservation solution is the 3N KCL solution. • Measurement should be avoided staggered pollution between solutions, so as not to affect the accuracy of measurement. • Electrode blub or sand core is defiled which will make PTS decline, slow response. So, it should be based on the characteristics of the pollutant, adapted to the cleaning solution, the electrode performance recovery. • Electrode when in use, the ceramic sand core and liquid outlet rubber ring should be removed, in order to make salt bridge solution to maintain a certain velocity. NOTE Differences between the probes, SEN0161 and SEN0169 Their usages/ specifications are almost the same. The differences locates at Long-firing Operation SEN0169 supports, while SEN0161 NOT, i.e. you can not immerse SEN0161 in water for Continuous Testing. Life Span In 25 , pure water, do Continuous Testing with them both, SEN0169 can work two years, while SEN0161 can only last for 6 months. And just for reference, if put them in turbid, strongly acid and alkali solution, 25 , the life span would drop to one year SEN0169 , 1 month or shorter, SEN0161 . Tempreture, pH, turbidity of the water effect the probe life span a lot. Waterproof You can immerse the whole probe SEN0169 into the water, while you can only immerse the front part of the probe SEN0161, the electrode glass bulb, into water, the rear part, from the white shell to the cable, MUST NOT be under water. Strongly Acid and Alkali SEN0169 are preferred for strongly acid and alkali test. And if your testing range is usually within pH6~8, then SEN0161 is capable for that. pH Electrode Characteristics The output of pH electrode is Millivolts, and the pH value of the relationship is shown as follows 25 : NOTE It is normal that if your reading is much different with the table since you are not reading from the electrode directly but from the voltage adapter, it has converted the original voltage -5V ~ +5V to Arduino compatible voltage, i.e. 0 ~ 5V. See the discussion on Forum. Usage Connecting Diagram NOTE: Before you insert the pH probe into one solution from another, or after you finish using the sensor, you must wash the pH electrode with pure water everytime distilled water is the best ! The closer power supply to +5.00V, the more accurate pH readings you could get. You have to immerse the pH probe into stationary solution instead of the running one to get relative stable pH readings. How long should it be under the solution? It depends on the pH value, the closer to neutral solution pH = the longer it will take. As we tested in water pH = the blue one costs 6 minutes, and in standard Acid/ Alkali solutions, it only needs 10 seconds. Method Software Calibration The software calibration is easier than the next part - Hardware Calibration through the Potentiometer. Because it writes the calibration values into Arduino's EEPROM, so you can calibrate once for all if you won't replace your Arduino. It uses mathematical method that to draw a line using two points, i.e. using the Acid standard solution, pH = and alkaline pH = or to draw the linear relation between the voltage and the pH value. For NOTE Arduino sample sketch "EEPROM Clear" NOTE: During the calibration from step 4 to step 7 , power outage should be avoided, or you will have to start over from step Software Calibration has nothing to do with the potentiometer on the adapter. Especially after you finished the calibration, you should never adjust the potentiometer, or you should start over. Moreover, considering the mechanical vibration might interfere the potentiometer value, you could seal it by Hot Melt Adhesive. If you want to try Hardware Calibration, you'd better reset the EEPROM setting by uploading the Arduino IDE sample sketch "EEPROM Clear" as shown as the right hand picture. Steps Wiring the pH probe, pH meter adapter the little PCB board and Arduino UNO as the Diagram section above. Upload the sample code "Software Calibration" below to UNO. Open Serial Monitor, choose command format as “Both NL & CR”and Send “Calibration” to enter Calibration Mode, and you will see “Enter Calibration Mode” directly.

PDF Datasheet Preview

PH meter SKU SEN0161

Analog pH Meter Kit SKU SEN0161

Analog pH Meter Kit SKU SEN0169

Contents
• 1 Introduction
• 2 Specification
• 3 Precautions
• 4 pH Electrode Characteristics
• 5 Usage

Connecting Diagram Method Software Calibration Method Hardware Calibration through potentiometer
• 6 FAQ

Introduction

Need to measure water quality and other parameters but haven't got any low cost pH meter? Find it difficult to use with Arduino? Here comes an analog pH meter, specially designed for Arduino controllers and has built-in simple, convenient and practical connection and features. It has an LED which works as the Power Indicator, a BNC connector and PH2.0 sensor interface. You can just connect the pH sensor with BNC connector, and plug the PH2.0 interface into any analog input on Arduino controller to read pH value easily.

Specification

SEN0161 dimension
• Module Power 5.00V
• Circuit Board Size 43mmx32mm
• pH Measuring Range 0-14
• Measuring Temperature 0-60
• Accuracy ± 0.1pH 25
• Response Time 1min
• pH Sensor with BNC Connector
• PH2.0 Interface 3 foot patch
• Gain Adjustment Potentiometer
• Power Indicator LED

Precautions
• Before and after use of the pH electrode every time, you need to use pure water to clean it.
• The electrode plug should be kept clean and dry in case of short circuit.
• Preservation Electrode reference preservation solution is the 3N KCL solution.
• Measurement should be avoided staggered pollution between solutions, so as not to affect the accuracy of measurement.
• Electrode blub or sand core is defiled which will make PTS decline, slow response. So, it should be based on the characteristics of the pollutant, adapted to the cleaning solution, the electrode performance recovery.
• Electrode when in use, the ceramic sand core and liquid outlet rubber ring should be removed, in order to make salt bridge solution to maintain a certain velocity.

NOTE Differences between the probes, SEN0161 and SEN0169

Their usages/ specifications are almost the same. The differences locates at

Long-firing Operation SEN0169 supports, while SEN0161 NOT, i.e. you can not immerse SEN0161 in water for Continuous Testing.

Life Span In 25 , pure water, do Continuous Testing with them both, SEN0169 can work two years, while SEN0161 can only last for 6 months. And just for reference, if put them in turbid, strongly acid and alkali solution, 25 , the life span would drop to one year SEN0169 , 1 month or shorter, SEN0161 . Tempreture, pH, turbidity of the water effect the probe life span a lot.

Waterproof You can immerse the whole probe SEN0169 into the water, while you can only immerse the front part of the probe SEN0161, the electrode glass bulb, into water, the rear part, from the white shell to the cable, MUST NOT be under water.

Strongly Acid and Alkali SEN0169 are preferred for strongly acid and alkali test. And if your testing range is usually within pH6~8, then SEN0161 is capable for that.
pH Electrode Characteristics

The output of pH electrode is Millivolts, and the pH value of the relationship is shown as follows 25 :

NOTE It is normal that if your reading is much different with the table since you are not reading from the electrode directly but from the voltage adapter, it has converted the original voltage -5V ~ +5V to Arduino compatible voltage, i.e. 0 ~ 5V. See the discussion on Forum.

Usage

Connecting Diagram

NOTE:

Before you insert the pH probe into one solution from another, or after you finish using the sensor, you must wash the pH electrode with pure water everytime distilled water is the best ! The closer power supply to +5.00V, the more accurate pH readings you could get. You have to immerse the pH probe into stationary solution instead of the running one to get relative stable pH readings. How long should it be under the solution? It depends on the pH value, the closer to neutral solution pH = the longer it will take. As we tested in water pH = the blue one costs 6 minutes, and in standard Acid/ Alkali solutions, it only needs 10 seconds.

Method Software Calibration

The software calibration is easier than the next part - Hardware Calibration through the Potentiometer. Because it writes the calibration values into Arduino's EEPROM, so you can calibrate once for all if you won't replace your Arduino. It uses mathematical method that to draw a line using two points, i.e. using the Acid standard solution, pH = and alkaline pH = or to draw the linear relation between the voltage and the pH value.

For NOTE Arduino sample sketch "EEPROM Clear"

NOTE:

During the calibration from step 4 to step 7 , power outage should be avoided, or you will have to start over from step Software Calibration has nothing to do with the potentiometer on the adapter. Especially after you finished the calibration, you should never adjust the potentiometer, or you should start over. Moreover, considering the mechanical vibration might interfere the potentiometer value, you could seal it by Hot Melt Adhesive. If you want to try Hardware Calibration, you'd better reset the EEPROM setting by uploading the Arduino IDE sample sketch "EEPROM Clear" as shown as the right hand picture.

Steps

Wiring the pH probe, pH meter adapter the little PCB board and Arduino UNO as the Diagram section above.

Upload the sample code "Software Calibration" below to UNO. Open Serial Monitor, choose command format as “Both NL & CR”and

Send “Calibration” to enter Calibration Mode, and you will see “Enter

Calibration Mode” directly.

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived SEN0161 Datasheet file may be downloaded here without warranties.

Datasheet ID: SEN0161 509083