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Introduction

Principle & Structure

pH value is used to express the value of hydrogen ion activity in solution, its definition is: pH=-Iga H+

where a H+ refers to the activity of hydrogen ions. In fact, when pH equals 0, the concentration of hydrogen ions in a solution is pH

It is 1×1014 times when it is 14. At the same time, this also means that the concentration of hydroxide ions in the solution when the pH value is equal to 14 is 1 × 1014 times that when the pH value is 0. When the concentration of hydrogen ions and hydroxide ions are equal (that is, the solution is neutral), the pH value is equal to 7. A pH value between 0 and 7 is called acidic, and a pH value between 7 and 14 is called alkaline. Keep in mind that a change in pH of 1 (eg from 6 to 7) means a 10-fold change in hydrogen ion concentration.

The pH meter commonly used in pH value determination consists of a glass electrode and a reference electrode to form a complete electrode system

The two different solutions of the glass electrode are separated by a glass film that is sensitive to changes in pH value. There is a constant potential on the glass membrane of the inner solution. Similarly, there is also a potential on the glass membrane of the outer solution that changes linearly with the pH value when the temperature is constant. The potential change caused by the change of each unit pH value is called the potential gradient.

The pH sensor is a composite electrode composed of a glass indicator electrode and a reference electrode. The measurement of pH is based on the potential difference measured in the solution of the working battery composed of the measuring electrode and the reference electrode, and realizes the online monitoring of pH by using the linear relationship between the pH value of the solution to be measured and the potential of the working battery.

The determination of pH value by temperature is mainly related to the following three aspects: the reference electrode used, the pH value of the known solution in the glass electrode, and the pH value of the solution to be measured. At a certain pH value, the temperature has no effect on the potential of the electrode system, and this pH value is called the equipotential point. In addition, at a certain pH level, the potential value of the system is 0V, which is called the zero potential point.

Whether it is the equipotential point or the zero-potential point, it is different according to the selected electrode. When the isoelectric point and zero-potential point of the electrode system in the product are both pH=7, the temperature has the least influence on most of them at this pH value.

Features

● Simple cleaning and activation, and fast balancing;

● Automatic temperature compensation function;

● Sensor connection status display (online/offline);

● Built-in self-diagnosis function to ensure accurate data;

● With buzzer switch and backlight switch;

● The distance between the sensor and the transmitter can reach over 100 meters;

● Standard digital signal output, special transmitter-free industrial and mining can realize integration and networking with other equipment;

● Modular installation of sensors to achieve plug and play;

● English and Chinese display can be switched, and it is more convenient to use Chinese.

application

On-line monitoring of pH in the process flow of sewage treatment plant inlet and outlet, sedimentation tank, biochemical reaction tank, etc.;

pH monitoring in municipal water supply industry, surface water, aquaculture and other industries;

PH on-line monitoring of water and wastewater treatment processes in various industrial production processes.

technical parameter

Type A
The main material:ABS+PC+glass fiber
Measuring range:0...14pH
Pressure range:≤6 bar
Protection class:IP68/NEMA6P
measurement accuracy:±0.01 pH
Medium temperature:0...50℃
storage temperature:15...65℃
Response time:≤10 seconds (reaching 95% of the end value, stirring state)
Temperature compensation:Without temperature electrode
Zero potential pH:7±0.25pH(15mV)
pH Impedance:≤3.5×108Ω
Theoretical percent slope:≥90% (25℃)
Installation size:Top/bottom fixed 3/4" NPT taper thread
size:Diameter 30mm*Length 175mm
Connection method:Low noise cable leads directly out
cable length:The standard cable length is 10 meters, which can be extended ≤30 meters
weight:0.2KG
Type B
Sensor main material:Black polypropylene, Ag/Agcl reference gel
Measuring range:0...14pH
Pressure range:≤6 bar
Protection class:IP68/NEMA6P
measurement accuracy:±0.01 pH
Medium temperature:0...80℃
storage temperature:15...65℃
Response time:≤10 seconds (reaching 95% of the end value, stirring state)
Alkali error:0.2pH(1mol/L Na+ pH14)(25℃)
Zero potential pH:7±0.25pH(15mV)
Theoretical percent slope:≥95% (25℃)
Internal resistance:≤250MΩ
Installation size:Top/bottom fixed 3/4" NPT taper thread
size:Diameter 28.7mm* length 194mm
Connection method:Low noise cable leads directly out
cable length:Standard cable length is 6 meters, can be extended
weight:0.2KG


Transmitter Specifications

power supply
AC power supply:AC 100...240V,5W
DC power supply:DC 9...24V,5W
Main material:Flame retardant ABS plastic
storage temperature:15...65℃
Operating temperature:10...55℃
Installation method:panel
Protection class:IP54
size:96mm*96mm*100mm (length*width*height)
weight:360g
Show output:128*64 graphic dot matrix LCD, with strong LED backlight, can be operated under direct sunlight
Display accuracy:±0.01 pH
Temperature measurement accuracy:±0.5℃

Selection table

AL31A-pH pH sensor

Probe Type

ABS

polypropylene

Measuring range

0...14pH

Specified range

cable length

Standard matching cable length 6 meters
M stands for meters, followed by items to represent the actual cable length, up to 30 meters.
The above selection table does not contain selection codes. For selection, please contact the sales staff or email to sales@kewill-auto.cn to obtain a complete sample.

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AL31B-pH pH transmitter

Power supply

DC 9...24V,5W

AC 100...240V,5W

output signal

Standard: 4...20mA current output + relay Relay output * 2 channels

Optional: 4...20mA+Relay*2ch+MODBUS RS485 communication

Alternatives: Additional Equipment

No additional accessories
Matching ABS material instrument protection box
Matching 1.4301 (304) material instrument protection box (indoor)
Matching 1.4435 (316L) material instrument protection box (outdoor)
The above selection table does not contain selection codes. For selection, please contact the sales staff or email to sales@kewill-auto.cn to obtain a complete sample.
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