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

1.Obtaining an accurate pH measurement

Buffer solutions For extremely accurate measurements National Institute of Standards and Technology (NIST) buffer solutions are recommended. These buffer solutions are the basis of the practical pH scale and have been adapted in the DIN 19266. However, they are almost exclusively used in the laboratory. Buffers customarily used (e.g. potassium dihydrogen phosphate and disodium hydrogen phosphate, borax or sodium carbonate) are distinguished by their high buffer capacity and long-term stability. These buffer solutions are used in most cases and should have an accuracy of not less than 0.02 pH units. The temperature curve of the buffer solution must be known. Buffer solutions last for a limited period of time. (Sealed bottles last for about one year when stored correctly). Using good lab practice should prevent buffer contamination. Carbon dioxide from the air may contaminate buffer solutions with a high pH value.

2.How to maintain a reliable signal

The pH electrode is an electrochemical sensor whose efficiency depends on a reversible interaction between the sensor and the measuring solution. The accuracy of the signal is decreased when residue on the glass membrane or reactions of the reference system disturb this exchange.

Maintenance of the electrode function An increase in response time of the electrode, a decrease of the slope, or a zero point shift, are all phenomena due to either a reaction with the measuring solution (contamination) or to the ageing of the electrode. Every electrode ages as a result of the chemistry of the glass even when it is not used for measurements. High temperatures increase this ageing process. Under laboratory conditions a life span of up to three years can be expected, With continuous measurements at 80°C, the life span of an electrode could be significantly decreased (perhaps to a few months). If a reaction between the measuring solution and the electrolyte causes disturbances, using an electrode with a silver-ion trap reference system, an electrolyte bridge, and /or a special electrolyte often improves conditions.

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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Location Tangyan South Road, High-tech Zone, Xi'an City, Shaanxi Province, China

Xi'an Kacise Optronics Co.,Ltd. is a professional manufacturer of  measuring instruments , located in China xi’an City. Since 2008, Xi'an Kacise focused on the development and production of pressure, level and flow measuring instruments .

We have been specializing in manufacturing pressure, level and flow measuring instruments and related products for 10 years. Based on experienced technical and management personnel, through efforts of our entire staff, we have become a professional measuring instrument manufacturer and solution provider. And we are continuously trying to improve product quality.

Xi'an Kacise is qualified with ISO 9001-2008, GJB 9001B-2009, CE, intrinsic safety explosion-proof and isolated safety explosion-proof certificates, etc. which ensure that our products comply with international standards.

Kacise sensors have already been exported to America, Spain, Australia, Chile and 20 other countries and regions, and received many favorable feedbacks. Our overseas distributers are also increasing. We regard “reasonable prices, efficient production time and good after-sales service” as our tenet, and hope to cooperate with more customers for mutual development.

Our goal is simple: to sell the best products at the best prices, and provides industry-leading customer service. We personally get to know each of our customers, and we know how to discover the most valuable part of our business , to help others achieve their goals.