Hydrogen pressure sensorIn order to ensure the safety of the spacecraft's launch phase and orbital phase propulsion system, NASA has developed an automatic detection system for hydrogen propellant leakage of the space shuttle suitable for ground and orbit. The system consists of a hydrogen pressure sensor array, a signal processing device and a diagnostic processor. It is composed of three parts. The hydrogen pressure sensor array is placed in locations where leaks may occur, such as fuel tanks, supply pipes, engine parts, flanges, equipment inlets and outlets of the propulsion system, and areas that are difficult to access for regular inspections. Then, let's learn about the hydrogen pressure sensor. What is the role of it!

Hydrogen pressure sensorThe hydrogen concentration in the surrounding environment is converted into an electrical signal, and the hydrogen leakage source and leakage amount can be determined by analyzing the hydrogen concentration change at different positions of the propulsion system. The hydrogen sensor structure encapsulates a PdAg alloy node (Ag content 13%), a temperature probe and a heating head as a detection chip. The gas sensor is developed on the basis of metal oxide semiconductor technology. The temperature in the chip is increased to an appropriate range by heating the head, and the gas components such as hydrogen react with PdAg to produce signal changes. The temperature probe is mainly used for temperature monitoring and feedback chip temperature.

Application of Hydrogen Pressure Sensor in Industrial Control

At present, in the field of industrial control, hydrogen pressure sensors are used to monitor the history of hydrogen concentration in fossil fuel or rocket fuel processing, ammonia, methanol synthesis process, etc. Nuclear reactors, the power generation industry, and the communications industry also need to monitor hydrogen leak alarms. The key to this application is that the hydrogen concentration must also be controlled below the set lower flammable concentration value.

For example, hydrogen concentration monitoring is a very important step in welding, electroplating and battery key characteristic parameters. Early hydrogen detection methods were mainly based on mass spectrometers and gas chromatographs. Among other things, mass spectrometer monitoring is accomplished by measuring the offset in the magnetic field. In recent years, with the emergence and development of nanomaterials and thin film hydrogen sensors, this detection method has gradually been replaced by hydrogen sensors.

The reason is thatHydrogen pressure sensorCompared with the early sensor, it has many advantages such as low cost, portability, response speed, integration and so on. The detection method of hydrogen pressure sensor is mainly based on the change of electrical characteristics (such as resistance, conduction, voltage, etc.), temperature, optical and mechanical properties of the active elements of the sensor. The hydrogen sensor is an ideal conversion device to convert these changes into a receivable electrical signal.

Hydrogen pressure sensorIn order to reduce the assembly, operation and maintenance costs of the leak detection system, NASA has improved the system design. During the X-33 and SR-71 aircraft propulsion system testing, the detection system can be directly connected to the spacecraft electrical control system for real-time online testing. The system is composed of 4 control modules and 20 hydrogen sensor modules, which realizes a single assembly, reduces the power supply, communication, cable and other hardware, and reduces the cost, weight and structural complexity of the aircraft condition monitoring system. In order to detect the special gas leakage of spacecraft during the launch phase and the orbit operation phase, NASA newly developed the hydrogen and helium leak detection telemetry technology in 2000 to identify and judge the spacecraft leak state by detecting the partial pressure change of hydrogen or helium gas, but this method is only applicable to the case of hydrogen and helium leaking from the atmosphere, and not applicable to the case of spacecraft vacuum leakage.

What is the role of the hydrogen pressure sensor is described above. If you need to know more, please feel free to contact us!

Jiangmen Hengmin Intelligent Control Instrument Co., Ltd. is a pressure transmitter manufacturer, mainly engaged in oil pressure sensors, wall-mounted boiler water pressure sensors, urea pump pressure sensors, hydrogen pressure sensors, pressure calibrators, automobile pressure sensors, water pump pressure sensors, water pressure Sensors, intelligent pressure controllers, high pressure sensors and other products. Our company found in the research industry production activities that with the increasing popularity of the Internet of Things and intelligent manufacturing concepts, the demand for pressure sensors in my country has grown rapidly in recent years. In response to the needs of the era of intelligent manufacturing, our company has developed high-precision testing instruments and special production system equipment for pressure sensor manufacturers to help sensor manufacturers greatly reduce the labor intensity of testing, reduce the number of workers, improve product quality, improve production efficiency and reduce production costs.