Dual High Impedance KPH601 Online PH Sensor Differential Amplifier
KPH601 Online PH Sensor Signal Output: RS-485 (Modbus/RTU Protocol)
1.Calibration
Both the zero point, the point where the pH electrode delivers 0
mVpotential and the slope of the calibration line show
manufacturing dependent tolerances and will change after exposure
to the measuring solutions. Therefore the pH electrode has to be
calibrated with accurately defined buffer solutions. In order to
make an exact calibration, the zero point of the measuring chain
has to be known. This is generally at pH 7. Two buffer solutions
chosen according to the desired accuracy and measuring range should
be used. The value of the first buffer solution should be close to
zero mV (at pH 7). The second buffer solution should have a pH
value within the measuring range. It should be noted that the two
buffer solutions must have a difference in pH values of at least
two pH units. As already mentioned, the pH value is temperature
dependent. Therefore, it is important that the temperature curve of
the buffer is known. Additionally, the buffer and the electrode
must be at the same temperature, or you must wait for the
temperature to reach equilibrium. The zero point calibration (pH 7,
first buffer) always has to take place before the slope calibration
(with a pH value close to the measuring value, second buffer)
except when working with a microprocessor controlled system. If a
very accurate measurement is required, it is advisable to repeat
the zero point calibration after the slope calibration.
The following factors directly influence the accuracy of the
calibration as well as the pH measurement:
• Buffer solutions
• Temperature measurement and temperature compensation
• Condition of the junction and the reference system
(contamination, etc.)
• Working technique
The stability of the zero point and the slope depends on the
composition of the measuring solution as well as on the
temperature. It makes little sense to make general statements
regarding the calibration frequency. Therefore, when working with
unknown solutions it is advisable to repeat the calibration often
in the beginning. When the calibration values are stable, the
calibration frequency may be extended. In general the calibration
frequency depends on the desired accuracy. To be able to calibrate
during the process, an electrode in a retractable housing is very
useful.
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
