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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
Model
KPH601
Measuring Range
0～14pH
Resolution
0.01pH
Accuracy
±0.1pH
Working Temperature
0～65℃
Working Pressure
＜0.2MPa
Temperature Compensation
Auto temperature compensation (NTC)
Power Supply
12～24VDC ±10%
Signal Output
RS-485(Modbus/RTU)
Wetted Material
POM
Mounting Method
Immersion mounting, 3/4 NPT thread
Cable Length
5 meters, other lengths can be customized
Calibration
Two-point calibration
Power Consumption
＜0.3W@12V
Protection Grade
IP68
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.
Contact Us
Website www.kacise.com
Phone +86-17719566736
Email sales@kacise.com
Location Tangyan South Road, High-tech Zone, Xi'an City, Shaanxi Province, China
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer
Year Established:
2008
Total Annual:
8000000-10000000
Employee Number:
100~150
Ecer Certification：
Verified Supplier
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... 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...
