Mettler pH electrode InPro 2000 450/PT1000/9848

Specification - pH Sensor InPro 2000 450/PT1000/9848

Mettler pH electrode InPro 2000 450/PT1000/9848

9848: Suitable for biochemistry, media containing proteins, organic solvents, and low temperatures
9816: Suitable for chemical processes, slow electrolyte flow rate 9830: Suitable for media containing a large amount of organic solvents 9823: Classic electrolyte, fast electrolyte flow rate, helps with membrane cleaning

6.10 Factors affecting online pH measurement
The pH value of the sample is not affected by the flow rate. However, the measurement of pH will be affected. In most applications (non high purity water), flow rate has little effect on pH measurement. When the sample passes through the electrode surface at a flow rate of O-2m/s, it will have a small impact on the diaphragm of the reference electrode. The pH measurement value will have a deviation of ± 0.1.
Pressure can also have a certain impact as the directly acting reference diaphragm will compress the process medium into the diaphragm. When the pH value is very low or high (<4 or>10pH), the impact will be greater, with a pH deviation of ± 0.2 It depends on the actual application.
Continuous high pressure and high flow rate can cause compression or expansion of the electrolyte, promoting its diffusion or contaminating the membrane, thereby shortening the service life of the pH electrode. The electrode can be installed in a bypass with normal flow rate and pressure to achieve the highest measurement performance and longest lifespan.
The measurement of pH in pure water (conductivity<40uS/cm) is greatly affected by flow rate. Do not install the sensor directly into a plastic flow cell or connector, as high-purity water will generate static electricity when flowing through the insulation surface, making the pH reading very sensitive to the flow rate. The electrode should be installed in a low flow rate bypass grounded stainless steel flow pool - typically with a flow rate of 50-100 mL/min. Due to the possibility of generating reference membrane potential in pure water So low flow rate is also very necessary. It is recommended to use liquid electrodes that can be filled with electrolytes to achieve appropriate precision.

6 Maintenance
1. Regularly check whether excessive pressure is applied to the sheath during operation and readjust it if necessary.
2. Regularly check the electrolyte level inside the sensor. When reaching the end of the spherical electrode rod (liquid storage tank), use the electrolyte labeled on the sensor for filling, and do not exceed the maximum liquid level indicator line.
3. For electrodes with salt bridge electrolyte, first fill the reference electrolyte into the outer chamber (marked in blue) not exceeding the maximum liquid level position. Then fill the inner chamber (marked in red) to a liquid level approximately 0.5 to 1.0 cm higher than the outer chamber.
4. After each production cycle, rinse the sensor head and diaphragm carefully with deionized water. Never let the measuring solution on these parts dry out!
5. When the sensor is not used, it, together with the sensor head and diaphragm, should be fully immersed in the same electrolyte as the reference electrolyte in the sensor.
6. If the sensor is stored together with the sheath, the rules described in 4) above shall prevail. However, the storage electrolyte needs to be slightly changed by replacing 2 parts of pH 9.2 buffer solution with 10 parts of electrolyte to prevent corrosion of the sheath parts.
7. If the sensor is stored dry for several days due to an error, it should be soaked in the normal storage electrolyte for several hours before use.
8. The connector should be checked regularly for signs of moisture. If necessary, thoroughly clean with deionized water or alcohol, and then carefully dry.
7 Troubleshooting
When the response speed is slow (e.g. after prolonged dry storage), pH sensitive glass may need to be reactivated. Soak pH sensitive glass (excluding other sensor components) in a reactivation (HF) solution (item number: 51319053) for 5 minutes. Then, rinse thoroughly with deionized water and immerse the sensor head and diaphragm in the reference electrolyte for at least 12 hours.
When the resistance of the reference electrode increases rapidly and/or drifts, it may indicate protein precipitation. Use gastric protease/HCI cleaning solution (item number: 51340068) to remove such precipitates. If such problems repeatedly occur, it should be considered to use a sensor with FriscolytTM/9848 electrolyte that can prevent protein precipitation.