KPH601 Online PH Sensor Signal Output: RS-485 (Modbus/RTU Protocol) 

1.Why are pH values measured?

We measure pH for a lot of different reasons, such as:

• to produce products with defined properties – During production it is important to control the pH to ensure that the end product conforms with the desired specifications. The pH can dramatically alter the properties of an end product such as appearance or taste.

• to lower production costs – This is related to the above-mentioned reason. If the yield of a certain production process is higher at a given pH, it follows that the costs of production are lower at this pH.

• to avoid doing harm to people, materials, and the environment – Some products can be harmful at a specific pH. We must be careful not to release these products into the environment where they can be a danger to people or damage equipment. To be able to determine whether such a substance is dangerous we first must measure its pH value.

• to fulfill regulatory requirements – As seen above, some products can be harmful. Governments therefore put regulatory requirements in place to protect the population from any damage caused by dangerous materials.

• to protect equipment – Production equipment that comes into contact with reactants during the production process can be corroded by the reactants if the pH value is not within certain limits. Corrosion shortens the lifetime of the production line, therefore monitoring pH values is important to protect the production line from unnecessary damage.

• for research and development – The pH value is also an important parameter for research purposes such as the study of biochemical processes.

2.Industrial pH measurement

The pH electrode assembly should be mounted in a place where it is easily reached and where defined conditions exists. Unlike laboratory measurements, industrial measurements are mainly continuous (on-line). Usually the process occurs in closed stirring vessels (chemical reactors, bioreactors). Measurements may, however, also be taken in pipe-lines, basins, or open canals. The process conditions may be very different. In addition to high temperatures and pressures, an electrical current may also have to be considered. An industrial pH electrode assembly consisting of a pH electrode and an electrode housing must be adapted to these circumstances. For industrial processes efficiency is critical. Hence, simple maintenance is of main interest. The choice of a suitable pH electrode assembly is determined by the installation possibilities. Ideally, a pH electrode assembly should be mounted in a place that is easily reached and where representative and defined conditions of the process exist. In a stirred vessel the electrode assembly is often installed laterally with the aid of a weld-in socket. Flange joints or screw connections are also used. In order to ensure that the glass membrane is always filled with the inner buffer an installation angle of at least 15° above horizontal should be used. It is difficult to install side mounted lateral support fittings in vessels with an inner lining of glass, enamel or rubber. In these vessels pH measurements must therefore be made through the cover with very long electrode assemblies. Especially in vessels containing solid components the stirring forces have to be considered. A basic principle is to make sure that the pH electrode assembly remains immersed in the solution, independent of the level of the solution. If there are no more free ports available in the cover, the pH value may be measured in a bypass. In this measuring arrangement you have to take a delayed change of the pH value into account. The installation of the bypass system must be done in such a way that clogging does not occur.

3.Technical Specifications

4.Dimensional Drawing

Note:The sensor connector is M16-5 core waterproof joint male head.

5.Installation

Note: The sensor should not be installed upside down or horizontally when installed, at least at an angle of 15 degrees or more.

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