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
