Regarding metal float flowmeters
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Dear marine friends, are you in need of metal float flow meters? There is a metal float flow meter with a measurement range of 0~~6T. Currently, it shows 5T outside and 4T inside; the measured current matches the 5T value indicated outside. It seems to be a problem with the DCS display, but I can’t figure out where the issue lies. The measurement range is the same indoors and outdoors
Pay special attention to the range settings of the DCS, as this is what causes most such problems!
It is necessary to determine whether this problem has existed before or is new. If it is a new issue and the output signal of the rotameter is normal, then the problem must lie in the section of the system itself; it could be a hardware fault, a wiring issue, or someone may have made incorrect changes to the DCS configuration. Test again to see if the signal at the card terminal is the same as the output signal of the flow meter; if they are not the same, it indicates a problem with the signal lines (usually at the junction box). If the signals are identical, then replace the card to determine if the issue persists; if it still remains the same, check for any errors in the configuration. If this problem persists, it is usually due to an error in the configuration. Check whether the display values referenced by your DCS are correct, whether they represent recalculated values, or whether they are values modified during simulation. If the configuration is correct, then check for any faults in the cards and signal wires.
If that is the case, please remove the wiring on the DCS card side and connect a signal transmitter to supply 4-20mA; this will help identify where the problem lies
There’s no need to take a square root; check the configuration settings instead, and verify the range； After modification, it can be verified using standard signals!
No need to take a square root; 1. Check whether the current value matches what is displayed on site. 2. Input a 4-20mA value to the DCS and check whether the display on the DCS is correct.
Take a look. Is the range in the configuration correct?
Check whether the indoor and outdoor flow rates are the same; first, it’s necessary to see if the actual flow rates are identical. Just check whether the current value matches that of the DCS; generally, there should be no problems
1. Confirm that the ranges are the same； 2. Isolate it using the distributor, and check the relationship between its input and output; they should be identical under normal conditions. Reason for isolation using the distributor: Check the flow meter’s load capacity ； 3. After 1-2 returns to normal, if it is feasible, replace the module or connect the signal from that point to another point, and observe the indication ； 4. No square root calculation is required for the configuration of metal rotor flowmeters in DCS ；
1) Check the safety barrier to see if there is a problem with it. 2) Try using a different channel
Use a signal generator to send a 4-20mA standard signal and check whether the measurement and range response of the card are accurate; generally, the liquid level follows a linear relationship. If not, go to the DCS configuration to view the settings for the IO points. If the readings appear normal, then check the field side by measuring the current with a cable from the control room, and then measure it again without any load connected to the cable, comparing the two readings. If the two readings differ significantly, it is recommended to replace the card or the IO points