Double High Impedance Online PH Sensor Immersion Mounting
KPH310 Online PH Sensor Signal Output: RS-485 Double High Impedance
Differential Amplifier Ip68
1.Application Environment
For environmental water quality monitoring, acid/alkali/salt
solution, chemical reaction process, industrial production process,
can meet the majority of industrial applications online pH
measurement requirements.
2.Feature
- Signal Output: RS-485(Modbus/RTU protocol).
- Convenient to connect to PLC, DCS, Industrial Control Computer,
General Controller, paperless recording instrument or touch screen,
and other third-party equipment.
- Double high impedance Differential amplifier, strong
anti-interference, fast response.
- The patented pH probe, with an internal reference fluid at a
pressure of at least 100 kpa (1 bar), oozes extremely slowly from
the microporous salt bridge, with a forward exudation lasting more
than 20 months. Such a reference system is very stable, electrode
life than ordinary industrial electrode times longer.
- Easy to install: submerged installation.
- Ip68, protection level.
3.Technical Specifications
| Model Number | KPH310 |
| Range Range | 0 ~ 14 Ph |
| Resolution | 0.01 ph |
| Precision | ± 0.1 ph |
| Operating Temperature | 0 ~ 65 °C |
| Working Pressure | < 0.2 mpa |
| Temperature Compensation | Automatic temperature compensation (NTC) |
| Power Supply | 12 ~ 24 VDC ± 10% |
| Signal Output | RS-485(Modbus/RTU) |
| Contact Material | Pom |
| Installation Mode | Immersion mounting |
| Cable Length | 5 meters, another length can be customized |
| Calibration Mode | Two-point calibration |
| Power Consumption | < 0.05 W |
| Protection Level | IP68 |
4.Dimensional Drawing
Tips: Q&A
1.What is pH? What is the principle of measurement?
The pH value of the solution is the negative logarithm of the
hydrogen ion activity in the solution, which is expressed as:
PH = - lgαH +
Because the value of hydrogen ion activity in an aqueous solution
is often very small, it is not convenient for application, so the
concept of pH value is used
As a solution acidity, neutral and alkaline indicators. Moreover,
the pH value can indicate the strength of the acidity and
alkalinity of the solution.
In this way, it is very convenient to apply, and thus:
Neutral solution: [H+]= [OH-] = 1X10^-7
Moles per liter, pH is minus lg[H+] is equal to 7
Acid solution: [H+] > [OH -], [H +] > 10^-7Mol /L, pH < 7,
the lower the pH, the more acidic;
Alkaline solution: [H+]<[OH-], [H +] < 10^-7Mol /L, pH >7,
the higher the pH, the more basic it is.
Activity is the effective concentration, that is, the portion of
the ion that is free to participate in a given reaction - that is,
to reach the surface of the electrode sensitive membrane to connect
to it
The part of the ion that's touching it. Because of the interaction
between ions in a solution, the activity is usually less than the
concentration, and this interaction will also be
Blocking the movement of ions reduces the number of ions reaching
the electrode membrane.
the measurement of pH electrode is the characteristic of the
corresponding relation between the output potential of galvanic
cell and the pH value of the solution.
This correspondence can be epresented by Nernst equation:
E = Eo-2.3 RT/F*pH
E = measure the potential
Eo = standard potential
R = the gas constant
T = absolute temperature (K)
F = Faraday constant
RT/F = 2.3 slope
The Nernst equation is a very important relationship in
electrochemistry.
When measuring pH, Eo(standard potential) and 2.3RT/F(slope) are
obtained by electrode calibration. Then the sample is measured to
obtain E (measured potential) and the pH value of the sample is
calculated by plugging it into the equation.
