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DX_Z~B系列单针指示报警仪与DDZ-Ⅱ型或其他电动仪表联合使用,可实现温度、流量、压力、液位等工业参数的指示、报警。由于它具有结构简单、维修方便、价格低廉等优点,因此在工业过程测量和控制系统中得到广泛的应用。笔者对目前我国生产的该系列仪表就环境温度对仪表测量误差的影响进行了分析,并采取了较有效的补偿办法,在保证主要技术指标及仪表基本结构不变的情况下,降低了温度附加误差,将原仪表精确度等级从1.5级提高到1.0级,并经过论证及模拟试验,性能稳定可靠,效果良好。 1.误差分析众所周知,DX_Z~B系列仪表属磁电系仪表(下称仪表)。当环境温度变化时,仪表要产生附加误差,其原因有如下三个方面: (1)当环境温度上升时,游丝的弹性减弱,仪表读数有偏“快”的趋势。一般来说,温度每升高10℃,弹性约减弱0.3%～0.4%; (2)当环境温度上升时,永久磁铁的磁性
DX_Z ~ B series of single-pin alarm indicator and DDZ-Ⅱ or other electric instruments used in conjunction, enabling temperature, flow, pressure, liquid level and other industrial parameters of the instructions, alarm. Because of its simple structure, easy maintenance, low price, etc., so in the industrial process measurement and control system has been widely used. The author analyzes the influence of the ambient temperature on the measurement error of the instrument currently produced in our country and adopts a more effective compensation method. Under the circumstance that the main technical indicators and the basic structure of the instrument are unchanged, the temperature reduction Error, the original instrument accuracy grade from 1.5 to 1.0, and after demonstration and simulation tests, the performance is stable and reliable, the effect is good. 1. Error Analysis As we all know, DX_Z ~ B series instrument is a magnetic system instrument (hereinafter referred to as instrument). When the ambient temperature changes, the instrument to produce additional error, the following three aspects for the following reasons: (1) When the ambient temperature rises, the elasticity of the hairspring weakened meter reading partial “fast” trend. In general, the temperature is increased by about 10 ℃, the flexibility of about 0.3% to 0.4%; (2) When the ambient temperature increases, the permanent magnet magnetic