我们在1978年开始试制MSZ—4数字压力计,并取得了成功。该仪器由压力传感器、前置放大器和模数转换器三部分组成,见图1。由于采用了线性集成电路和PMOS集成电路,该仪器具有精度高、稳定性好、可靠性强、零漂小、使用简单、维修方便、耗电省、体积小、重量轻、价格低等优点。因此,适用于实验室和厂矿进行非腐蚀性的气体和液体的压力 We started trial production of MSZ-4 digital pressure gauge in 1978 and achieved success. The instrument consists of pressure sensor, preamplifier and analog-digital converter composed of three parts, shown in Figure 1. Due to the use of linear integrated circuits and PMOS integrated circuits, the instrument has the advantages of high precision, good stability, high reliability, small drift, simple use, easy maintenance, low power consumption, small size, light weight and low price. Therefore, for non-corrosive gases and liquids in laboratories and mines