KPH601 Online PH Sensor Signal Output: RS-485 (Modbus/RTU Protocol)
1.Temperature compensation
The pH range (0-14) is determined through the ion product of the water, which to a very small extent dissociates into H+ and OH– ions. [H+ ] [OH– ] = 10–14 = I (25°C) The ion product I is strongly dependent on temperature.
The temperature influences the pH measurement through four factors:
• Chemical equilibria are temperature dependent
• Temperature dependence of the slope (see Nernst equation below)
• Position of the isothermal intersection
• Differing response time of the electrode (caused by temperature changes).
Every measuring solution has a characteristic temperature and pH behaviour (temperature coefficient). In general you should assume that a
temperature change results in a pH change (see buffer/temperature
table below). The reason for this is the temperature dependent dissociation which causes a change in the H+.
Buffer/temperature table Example:
| | 20℃ | 30℃ |
| 0.001 mol/ L HCI | pH 3.00 | pH 3.00 |
| 0.001 mol/ L NaOH | pH 11.17 | pH 10.83 |
| phosphate buffer | pH 7.43 | pH 7.40 |
| Tris buffer | pH 7.84 | pH 7.56 |
3.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 |
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.
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
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Dual High Impedance KPH601 Online PH Sensor Differential Amplifier Images
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