1、 Selection precautions

1. Accuracy and speed matching
   • Select the appropriate accuracy level according to the requirements of the application scenario. For example, in equipment such as tower cranes and hoists, priority should be given to meeting safety limit requirements before considering precision redundancy; In autonomous driving or precision engineering, high-precision sensors (such as laser or optical principles) need to be selected.
   • The response speed needs to match the speed of the object being measured. High speed motion scenarios (such as automated production lines) require the selection of sensors with high sampling frequency and low delay to avoid signal lag and misjudgment.
2. Stability and reliability
   • Evaluate the adaptability of sensors in harsh environments such as high temperature, humidity, corrosive gases, or strong electromagnetic interference. For example, in construction projects, sensors with IP68 protection level need to be selected to prevent dust and rainwater from entering; In the field of chemical engineering, corrosion-resistant materials (such as 316L stainless steel) or isolation membrane technology should be selected.
   • Prioritize the selection of sensors with redundant design or fault self diagnosis function to enhance the system's fault tolerance capability.
3. Balance between cost and maintenance cost
   • Taking into account both initial procurement costs and long-term maintenance costs. For example, although optical sensors have high accuracy, they require regular lens cleaning and are costly; Mechanical contact sensors have low cost, but are prone to wear and require frequent replacement.
   • Choose sensors with modular design for easy maintenance and component replacement, reducing the overall lifecycle cost.
4. Installation method adaptability
   • Choose the appropriate installation method based on the device structure (such as flange installation, bracket installation, or embedded installation) to ensure that the sensor is coaxial with the measured object and there is no mechanical interference.
   • In tower cranes and other equipment, it is necessary to ensure that the sensor installation position matches the limit transmission ratio to avoid a decrease in display accuracy or insufficient range caused by a transmission ratio that is too large.

2、 Installation precautions

1. Mechanical installation accuracy
   • Ensure that the sensor is firmly connected to the object being measured to avoid signal fluctuations caused by vibration or impact. For example, in the suspension system of a car, a rigid coupling is required to connect the sensor shaft to the guide rod to prevent clearance during movement.
   • Sufficient limit travel space should be reserved during installation to prevent the sensor from being damaged under pressure at its extreme position. For example, in pneumatic suspension systems, the height gauge rod needs to float within the limit stroke range to avoid being tightly attached to the limit line during lifting or lowering.
2. Electrical Connection Specification
   • Follow the sensor wiring diagram for electrical connections, ensuring that the power, signal, and grounding wires correspond correctly. For example, when checking the power supply, it is necessary to unplug the sensor plug and measure whether the voltage of the power terminal on the connector is 12V after ignition.
   • Use shielded cables to transmit signals and stay away from high-voltage lines or power cables to reduce electromagnetic interference.
3. Environmental protection measures
   • When installing sensors outdoors or in humid environments, it is necessary to install protective covers or enclosures to prevent rainwater, dust, or corrosive substances from entering. For example, in construction cranes, sensors need to be installed in a location with good waterproof and dustproof effects inside the driver's cab.
   • Avoid long-term exposure of sensorsharshWhen necessary, temperature compensation technology or wide temperature sensors should be used in temperature environments.

3、 Precautions for use and maintenance

1. Regular calibration and testing
   • Establish a regular calibration plan and calibrate sensors using standard equipment or samples to ensure that the output signal is consistent with the actual height. For example, in the tower crane safety monitoring system, electronic scales need to be used for initial calibration and debugging of amplitude and height sensors, and regular re inspection is required.
   • Check if the sensor signal voltage or waveform is normal. For example, in a car suspension system, a multimeter can be used to measure the voltage at the sensor signal socket (which should vary between 0-1V), or an oscilloscope can be used to check if the signal waveform is a rectangular square wave.
2. Physical inspection and cleaning
   • Regularly inspect the appearance of the sensor for signs of wear, corrosion, or looseness. For example, in the chemical industry, it is necessary to check whether there are traces of corrosive liquid leakage on the sensor housing.
   • Clean the dust or oil stains on the surface of the sensor to ensure that the sensing element is unobstructed. For example, in optical sensors, it is necessary to regularly clean the lens to prevent the light path from being obstructed.
3. Avoid overload and misoperation
   • Ensure that the sensor does not exceed its rated measurement range to prevent damage caused by overload. For example, in hydraulic systems, it is necessary to select a displacement sensor with an appropriate range based on the stroke of the hydraulic cylinder.
   • Operators need to receive professional training to avoid accidentally touching sensors or forcibly adjusting limit devices. For example, in the installation of pneumatic shock absorbers, it is necessary to ensure that the height gauge rod still meets the limit stroke requirements after adjustment and truncation.