在线振动管液体密度计自动校准装置的研究

Research on an Automatic Calibration Device for Online Vibrating-Tube Liquid Densimeters

摘要: 针对传统在线振动管液体密度计校准过程繁琐、效率低下的问题、人工干预多、易引入误差等问题，本文设计并实现了一种基于多管道并行架构的在线振动管液体密度计自动校准装置，该装置集成了测量部分、循环部分、移动装置及PID控制系统，形成一套完整的校准平台。测量部分可同时安装三台被测密度计，支持并行校准；循环部分包括三套校准介质循环管道以及三套清洗循环管道，分别用于多种介质条件下的密度标定和系统清洗；移动装置用于实现测量部分在校准介质循环管道和清洗循环管道之间的移动，以接入校准介质循环管道和清洗循环管道中的其中一个。被测密度计在不同校准介质循环管道之间切换而进行标定时，无需对校准介质循环管道内的溶剂进行更换或减少更换次数，省去了清洗管道和仪表所需的时间，同时避免了因清洗不彻底导致的交叉污染。系统支持多台密度计并行校准，能够极大提高校准效率，适用于大规模、多批次的密度计校准需求。

Abstract: To address the limitations of traditional calibration methods for online vibrating-tube liquid densi- tometers, such as cumbersome procedures, low efficiency, high manual intervention, and susceptibility to human error, this paper presents the design and implementation of an automated calibration device based on a multi-pipeline parallel architecture. The system integrates a measurement module, a circulation module, a moving mechanism, and a PID-based control system into a comprehensive calibration platform. The measurement module accommodates up to three densitometers under test simultaneously, enabling parallel calibration. The circulation module comprises three sets of calibration fluid circulation pipelines and three sets of cleaning pipelines, dedicated to density calibration under multiple medium conditions and systematic cleaning, respectively. A moving mechanism facilitates the switching of the measurement module between calibration and cleaning pipelines, allowing it to connect selectively to any one pipeline. When calibrating a densitometer by switching among different calibration fluid pipelines, the solvent replacement within the pipelines is either unnecessary or significantly reduced. This approach eliminates the time required for pipeline and instrument cleaning while preventing cross-contamination caused by incomplete cleaning. By supporting parallel calibration of multiple densitometers, the system substantially improves calibration efficiency and is well-suited for large-scale, batch-based densitometer calibration demands.