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

1.Temperature compensation

This has to be taken into consideration if pH values obtained by different temperatures are to be compared. Furthermore, the slope depends on the temperature (Nernst equation): E = E0 – 2.303 RT / F  ∆ pH (R,F = constant) Where: E = measured potential E0 = zero point potential ∆pH = difference in pH between outside and inside of the glass membrane F = Faraday constant R = universal gas constant T = temperature Kelvin the slope increases with an increase in temperature (see “5.6 The influence of temperature on pH measurements“ on page 85). The most exact pH value is obtained when the temperature of the calibration and measured solutions are identical. pH Theory Guide 35 METTLER TOLEDO The temperature compensation of the transmitter corrects for this effect. An electrode would have an ideal temperature behavior if its calibration lines (isothermals) intersect at the zero point of the electrode (pH 7 = O mV) at different temperatures (see Figure 18 below). Figure 18 Calibration line and isothermal intersection points. Since the overall potential of the pH electrode is composed of the sum of many single potentials, which all have their respective temperature dependencies, the isothermal intersection hardly ever coincides with the zero point of the electrode (the ideal case would be: 0 mV at pH = 7/25°C). In the last few years, the development of the electrode has concentrated on bringing the isothermal intersection and the zero point as close ­together as possible, since the nearer they are to pH 7 the smaller the error in the temperature compensation. Besides, the measuring error increases with an increasing temperature difference be-tween the calibration and the actuai measuring. As a rule the errors are in the order of 0.1 pH units.
2.Technical Specifications

3.Dimensional Drawing

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

4.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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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.