The 4SiH4 - 20 silane gas sensor is a device used to detect the concentration of silane (SiH4) gas. Here is the relevant information:

• Measuring Range: According to the information from the China Intelligent Manufacturing Network, the 4NE series sensors developed by Shenzhen Shengkaian Technology for gas detector manufacturers have a measuring range of 0 - 5/20/50 ppm for silane, and it is speculated that the measuring range of the 4SiH4 - 20 sensor may be 0 - 20 ppm.
• Detection Principle: The silane gas produced by Shengkaian Technology uses an imported electrochemical sensor and microcontroller technology. It is inferred that the 4SiH4 - 20 sensor may also adopt an electrochemical principle. The electrochemical sensor usually consists of a three - electrode system (working electrode, counter - electrode, reference electrode) and a liquid electrolyte, and works at a constant potential. The gas diffuses through the pores to the working electrode of the sensor, and an electrochemical reduction reaction occurs on the electrode surface. The magnitude of the current signal is proportional to the concentration of the measured gas.
• Output Signal: Taking the SiH4/NE - 301 gas of Shengkaian Technology as a reference, it may have a two - wire 4 - 20mA current signal output (three - wire optional) and an RS - 485 digital signal output. It can also be equipped with 2 relay outputs (optional), and the passive contact capacity is 220VAC 3A, 24VDC 3A.
• Technical Parameters: The detection accuracy of the SiH4/NE - 301 gas of Shengkaian Technology is 2% (F.S), the repeatability is 1%, the zero drift is 1% (F.S/year), the response time is less than 20S, the recovery time is less than 20S, the sensor life is 24 months, the working temperature range is - 20℃ to + 70℃, and the relative humidity is 95% RH (non - condensing). The 4SiH4 - 20 sensor may have similar technical parameters.
• Application Scenarios: Silane gas sensors are mainly used in semiconductor manufacturing, industrial production (such as solar cell manufacturing, coating production), environmental monitoring, laboratory research and other fields to detect the leakage and concentration of silane gas, ensuring production safety and environmental protection.