Introduction: In usePressure transmitterWhen using a pressure transmitter, we often encounter some problems such as inaccurate temperature measurement and temperature fluctuations. It is also very difficult to choose what kind of pressure transmitter to use, unless we have a good understanding of the working environment and various models of temperature transmitters.
　　
　　Pressure transmitterThe current exceeded the range, and upon inspection, multiple small protrusions were found on the diaphragm. The measuring medium was steam, and the diaphragm at the low point was subjected to inelastic deformation due to ice. The on-site liquid level gauge has a significant deviation from the central control display, which is likely due to freezing damage. It is also possible that the oil may have bulged due to the high temperature.
　　
Measuring steam usually uses condensed water as the pressure medium, so steam tracing is required to prevent the condensed water from freezing. In addition, it is important to avoid direct long-term contact of steam with the membrane box. For unused transmitters, the pressure tube should be drained of condensed water to prevent negative pressure suction caused by water condensation and damage to the membrane box.
　　
The membrane is generally flat, with only a dozen or so protrusions the size of needle tips, and it doesn't look like it's frozen,
　　
The transmitter for measuring steam should pay attention to the following points:
　　
1. Measuring steam requires heat tracing! Especially in winter, it is necessary to add insulation and heat tracing.
　　
2. ForPressure transmitterTo prevent the high temperature of steam from affecting the membrane box and silicone oil, an isolation tank (condensation tank) should be added.