Two methods for connecting thermocouples to DCS

Thermocouples are a kind of temperature sensor that we often use everyday. However, when some users are using it, there is some doubt about whether the cold junction temperature compensation wire of the thermocouple is connected to the DCS. If there is no temperature transmitter in the middle, the DCS card is a thermocouple, then the compensation wire must be connected to the card; if there is a temperature transmitter, then the compensation wire is connected to the temperature transmitter, from the temperature transmitter It is 4-20mA signal to DCS. In order to help everyone understand and use it better, Xiaobian will next introduce two methods for connecting thermocouples to DCS:

1. Thermocouples use compensation wires, and there may be nodes in the middle, but they must be directly connected to the DCS thermocouple module with corresponding compensation cables, such as the LLMUX card in HONEYWELLTPS. Minimize nodes to reduce interference. In addition, the corresponding thermocouple type and compensation method must be selected in the DCS configuration.

2. Thermocouples use transmitters (temperature transmitters) in the field to convert to 4~20mA standard signals, then receive indoor safety barriers (if necessary, such as chemical environment), and then access DCS standard analog signals. Cards (common AI card). Pay attention to the need to use a compensation cable between the thermocouple and the transmitter. The transmitter must be set in compensation mode, thermocouple type, calibration range, etc. DCS must set the range, signal type, etc.

Deep Drawing

Deep drawing is a Sheet Metal Fabrication process in which a sheet metal blank is radially drawn into a forming die by the mechanical action of a punch. It is thus a shape transformation process with material retention. The process is considered "deep" drawing when the depth of the drawn part exceeds its diameter. This is achieved by redrawing the part through a series of dies. The flange region (sheet metal in the die shoulder area) experiences a radial drawing stress and a tangential compressive stress due to the material retention property. These compressive stressesesult in flange wrinkles (wrinkles of the first order). Wrinkles can be prevented by using a blank holder, the function of which is to facilitate controlled material flow into the die radius.

Deep drawing is one of the most widely used processes in sheet metal forming. It is used in a wide range of production processes. For example, it is used by the automotive industry to manufacture car parts; it is also used for making household items such as stainless steel kitchen sinks.

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