One of the important capabilities of the glove box:
Reduce water and oxygen content and ensure the cleanliness of the box
So how to measure the water and oxygen content in the tank?
You need to rely on some external equipment~
Accurate temperature, humidity, and dew point measurement
Separate design of sensor and meter body
A variety of interchangeable probes are available, suitable for humidity measurement in different occasions
Good stability, small annual drift
Can convert dew point and PPm
Sensor automatic diagnosis and automatic correction
Quickly display dew point, humidity and temperature values
Accuracy: high precision, no aging
Through PLC or independent display
Dew point: temperature, humidity, balance trend arrow indication
Provide measurement reports to ensure reliable product quality
For the glove box, the oxygen sensor used to detect the oxygen content inside is a very critical component. When installing the equipment at the customer’s premises, the customer often asks me questions about the oxygen sensor, so it is necessary for us to understand it. Working principle and detection method. At present, there are mainly two kinds of sensors on the market, namely, electrochemical fuel cell and zirconia. The working principles of these two kinds of sensors are quite different.
For the glove box, the oxygen sensor used to detect the oxygen content inside is a very critical component. When installing the equipment at the customer’s premises, the customer often asks me questions about the oxygen sensor, so it is necessary for us to understand it. Working principle and detection method. At present, there are mainly two kinds of sensors on the market, namely, electrochemical fuel cell and zirconia. The working principles of these two kinds of sensors are as follows.
Electrochemical fuel cells use oxygen as the positive electrode, metallic lead as the negative electrode, and potassium hydroxide as the electrolyte. The electrolyte and metallic lead are enclosed in a small cylindrical container, and the opening is sealed with a PTFE membrane. Oxygen can diffuse into the battery through the PTFE membrane. When the oxygen gets electrons on the positive electrode and the metallic lead on the negative electrode Loss of electrons produces electric current, and the magnitude of the electric current is proportional to the oxygen concentration. When there is no oxygen, there is no electric current. Therefore, the zero point of the electrochemical fuel cell is accurate, and only a single-point calibration is required during calibration. It is precisely because the zero point of the electrochemical fuel cell is accurate, so it is very suitable for the analysis and detection of trace oxygen.
Although the electrochemical fuel cell contains lead metal, which is a consumable material, it will not be used up due to its low oxygen content when used on a glove box. Battery failure is mainly due to the electrolyte failure due to the diffusion of water in the electrolyte out of the polytetrafluoroethylene film, and the typical life span is two years. When the failure of the fuel cell makes the oxygen analyzer inaccurate, the user only needs to replace the fuel cell in the analyzer, and the replacement cost is less than one-third of the price of the entire analyzer.
Electrochemical fuel cell detection of oxygen is a redox chemical process at room temperature, so it is less affected by a small amount of ordinary organic solvents, but if the gas contains strong oxidizing or acidic gases such as Cl2, HCl and H2S, electrochemistry is not suitable Fuel cell oxygen analyzer.
- The zero point is accurate, not easy to drift, only a single point calibration is required
- Strong resistance to the influence of organic solvents
- The replacement cost is low, only the fuel cell needs to be replaced
- The fuel cell’s long-term contact with high concentration oxygen will affect its life, and the battery needs to be stored in an inert atmosphere
- Cannot be used to detect high temperature gas
- It cannot be used to detect acid gas and strong oxidizing gas such as Cl2, HCl and H2S in the gas
There are two (or more than two) glove operation interfaces on the main box body, which are distributed on the front side (or front and back sides) of the box body, which enables the operation box to be operated by one (or several) people at the same time, which improves the box body The efficiency of use. In addition, there are observation windows in the front (or front and back) of the box, so that the operator can clearly observe the operation process inside the box, so that the operation process can be visually displayed in front of the operator’s eyes. The valve of the transition chamber has suction and charging nozzles, which can be connected when suction or charging is required. Valves and nozzles are also installed on the main box body, which can be used by the user when deflating or inflating the main box body to maintain air pressure balance (the three-way valve between the glove ports can also be used to deflate if necessary). Illumination fluorescent lamps are installed above the front observation window of the main cabinet. The transition chamber is used as the transition space between the main box body and the outside of the box body. It is composed of two sealed doors, two valves, and a chamber body. The two doors inside and outside can effectively isolate the main box from the outside world, so that things inside and outside the box can enter and exit when the main box is isolated from the atmosphere, thereby avoiding the trouble of repeatedly vacuuming and inflating the main box.
Glovebox oxygen sensor
Alpha Omega 3000 Oxygen Analyzer
Oxygen Sensor with display
Alpha Omega oxygen sensor