Organize and summarize the content of controlled posts

Let me give an example to show how it’s done; I really want to participate

Let’s try sending it out to see if it meets the requirements. —— The value displayed by the remote pressure transmitter does not match that shown on the DCS screen. Address: http://bbs.hcbbs.com/thread-1581855-2-1.html Question: The remote pressure transmitter shows 0.85 kPa, while the DCS screen displays -1.7 kPa. The pressure transmitter has been checked and is functioning properly; what could be the reason? A: Try a different card module. Q: The card is fine. A:1. What type of pressure transmitter is it? Is it a pressure guide tube or a capillary? 2. Is there any zero drift in the instrument zero at the site? 3. What about the accuracy of the instrument? Q: The Rosemount single-flange diaphragm head has a normal zero point. The capillary issue is probably not related to the site itself; it’s just unclear what might be wrong with the DCS system. A: Everything from the field is correct. Then check whether the DCS values match the field measurements; if not, take a look at the program. Q: The ranges are the same, but I’m not very familiar with the program. A: Has the cable been checked to ensure it is properly grounded or something like that? You can also test the DCS by sending a 4–20mA signal and checking whether the values match, in order to determine which side has the problem. A: The capillary type is the right one; the capillary itself has a static pressure that is displayed on the gauge, whereas this value is not shown in the transmission unit. A:1. Check the transmitter’s zero point and range. 2. Check the transmitter’s output zero point and output range. 3. Check the DCS input zero point and input range. 4. Check the consistency of current at both ends of the cable. A: Is the range fine? Q: No problems. A: Is there a safety barrier in between? Q: Yes, the current and the displayed value match. A: Recommendations: 1. Disconnect at the safety barrier and send a signal to the system using 475, for example at 20mA or 12mA, to check whether the indoor configuration is working properly ； If the signals from the DCS and the transmitter match, it indicates that the DCS is functioning properly. Go and check the clock outside. 2. First, confirm that no wires are connected incorrectly at that terminal of the table; then switch to another AI terminal nearby that displays properly. Use the values on site to make calculations to see if the DCS is showing correctly. If it’s normal, it should be a problem with the program configuration. If it also shows abnormal values at other normal points, then you should go to the site to check whether there are any problems with the gauge and the intermediate circuits. 3. Measure the milliampere signal value at the safety barrier, and determine whether this value corresponds to 0.85 or -1.7. If it’s a value obtained on-site, have someone check the signal on the gauge to see if it matches the value you measured in the cabinet room. 4. Another thing to check is the resistance value of the cable; the presence of any internal damage can be determined based on this resistance value. 5. If the measured pressure is negative, such as (-1.0~5), it is essential to ensure that the lower limit indicated by the gauge matches the lower limit set by the DCS. Q: I tried everything you mentioned back then, and there were no problems. Q: Thank you, it’s already been resolved. A: Could you explain what caused the issue and how it was fixed? Q: The threshold value in the DCS configuration is incorrect.

Come to offer your support:hug:

We hope that everyone will be able to participate in this activity. By continuously organizing and summarizing our efforts, one day even a beginner will become very skilled!