The selection of a gas flow calibration device is a complex and meticulous process that requires comprehensive consideration of multiple factors to ensure its accuracy and reliability. The following are some key selection steps and considerations:
1. Clarify the measurement requirements
●Measurement medium: Determine the type of gas to be measured, such as pure gas or mixed gas such as nitrogen, oxygen, and air. For corrosive or explosive gases, it is necessary to select a calibration device with corresponding protection performance.
●Measurement range: Determine the measurement range according to actual needs, including minimum flow, maximum flow, and common flow. Select a model with a measurement range slightly larger than the actual needs to cope with flow fluctuations and future expansion needs.
●Measurement accuracy: Select a calibration device with the required measurement accuracy according to application requirements. For example, laboratory applications usually require higher accuracy.
2. Consider environmental conditions
●Temperature: clarify the actual temperature of the measured medium and the working environment temperature of the calibration device to ensure that the calibration device can work normally within this temperature range.
●Pressure: consider the inlet and outlet pressures and working pressure difference of the measured gas to ensure that the working pressure range of the calibration device can meet the requirements.
●Space limitation: select the appropriate calibration device model according to the installation environment and space limitations to ensure that it can be correctly installed in the pipeline or system.
3. Technical performance requirements
●Shockproof performance: For gas flow calibration devices installed on production pipelines for long-term operation, their shockproof performance should be considered. Select a calibration device with a pressure resistance slightly greater than the working pressure of the measured medium, generally 1.25 times.
●Energy loss: Consider the energy loss caused by the flow measurement element, and avoid using multiple measurement elements with large pressure loss in the same production pipeline.
●Communication method: Select a suitable communication method according to needs, such as analog signal control (4-20mA, 0-5V, etc.) or digital signal control (RS485, Profibus, etc.). If remote monitoring and data transmission are required, a calibration device with corresponding functions should be selected.
4. Other considerations
●Maintenance convenience: Choose a calibration device model that is easy to maintain and service, including cleaning, calibration, and replacement of wearing parts.
●Price and cost-effectiveness: Different models of calibration devices have different prices, and you need to choose according to your actual needs and economic strength. On the premise of meeting the measurement requirements, choose a calibration device with high cost-effectiveness.
5. Communicate with suppliers
Communicate with suppliers to confirm whether the selection is accurate and understand the detailed specifications and performance of the products. At the same time, you can ask suppliers for advice and support on product installation, commissioning, maintenance, etc.
