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现以电动单元组合仪表DDZ一Ⅱ型差压变送器为例．介绍如下，图1差压变送器安装图（注：测量蒸气流量一次问后需装平衡罐）如图1，由于现场运行差压变送器的故障大多是零点漂移和导压管接头、阀门等处堵塞和泄漏，所以现场除对刻度校验外，主要是检查零点和输出电流的变化趋势。
Now the electric unit combination meter DDZ a type Ⅱ differential pressure transmitter as an example. As shown in Figure 1, the differential pressure transmitter installation diagram (Note: the measurement of steam flow once asked to balance tank) As shown in Figure 1, due to the failure of field operation differential pressure transmitter are mostly zero drift and pressure pipe fittings, Valves and other places blocked and leaked, so the scene in addition to the calibration calibration, the main is to check the zero and output current trends.