一、前言 目前国内数字式温度计已有比较多的型式,但由于结构较复杂而且成本高,使其推广应用受到影响。为了配合我厂烟道尾气温度、油罐温度的测量(150℃以内),我们选用了WZB-270型铂热电阻作为测温元件,采用宽偏移电桥放大器作为电阻-电压转换器,选择国内最新的5G14433大规模集成A/D转换器等元件装配了一台数字式温度计。整机 I. Introduction At present, there are many types of digital thermometers in China, but due to the complicated structure and high cost, their popularization and application are affected. In order to cope with the flue gas temperature in our factory and the measurement of the tank temperature (within 150 ℃), we chose the WZB-270 platinum RTD as the temperature measurement component and the wide offset bridge amplifier as the resistance-to-voltage converter The latest domestic 5G14433 large-scale integrated A / D converter and other components equipped with a digital thermometer. Machine