Method for eliminating interference signal in DCS temperature measuring system and DCS temperature measuring system
A technology of temperature measurement and interference signal, applied in the field of dry high-precision DCS temperature measurement system, can solve the problem of inaccurate DCS temperature measurement, and achieve the effect of ensuring control and eliminating interference signals
Inactive Publication Date: 2012-06-06
GUIZHOU XINGHUA CHEM +1
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Problems solved by technology
[0003] The technical problem to be solved by the present invention is to overcome the inaccurate defect of the existing DCS temperature measurement, provide a method of using an isolation safety barrier to eliminate interference signals in the DCS temperature measurement system and a DCS temperature measurement system capable of accurately measuring temperature
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[0016] Since the display circuits for all temperatures are the same, the following uses the measurement of ammonia cooling temperature as an example to illustrate.
[0017] Such as image 3 As shown, an isolation safety barrier is connected in front of the input terminal card. The output signal of the isolation safety barrier is DC 4-20mADC. Therefore, it is necessary to ensure that the input terminal card can receive a DC signal of 4-20mADC. The three signal lines A, B and C from the on-site ammonia cooling temperature thermal resistance are respectively connected to the input terminals 1, 2 and 3 of the isolation safety barrier, of which pins 2 and 3 are on-site short-circuit terminals, and the isolation safety barrier is equipped with 24VDC The power supply, the isolation safety barrier receives the temperature signal with interference signal sent from the thermal resistance, and is filtered by the isolation safety barrier to become a real and effective temperature signal. ...
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The invention discloses a method for eliminating an interference signal in a DCS temperature measuring system. According to the method, an isolated safety barrier is used to filter a temperature signal to eliminate an interference signal in the temperature signal. Meanwhile, a DCS temperature measuring system is also disclosed. The system comprises a temperature measurement element, a DCS input terminal card and a DCS temperature display system; and an isolated safety barrier is arranged between the temperature measurement element and the DCS input terminal card. Compared with the prior art, the technology employed in the invention enables the following beneficial effects to be realized: the isolated safety barrier is employed to filter a temperature signal, thereby effectively eliminating an interference signal that is doped in the temperature signal; the DCS input terminal card obtains an accurate temperature signal without interference signal and then the accurate temperature signal is transmitted to the DCS temperature display system by the DCS input terminal card; and because the signal that is obtained by the terminal card is real and effective, accurate temperature display by the DCS system can be ensured and control on the production process by the DCS system can be effectively ensured.
Description
technical field [0001] The invention relates to a DCS temperature measurement system, in particular to a high-precision DCS temperature measurement system which uses an isolation safety barrier to filter temperature signals. Background technique [0002] The application of DCS (distributed control system) brings great help to operation and maintenance personnel. However, just because the DCS system centralizes the control points of field instruments, the signals collected from the field, such as thermal resistance and thermal power corners, directly enter the DCS input card (multi-channel terminal board). Signal lines such as thermal resistors and thermoelectric corners are often affected by on-site high voltage, magnetic field, etc., with some interference signals, which will affect the display results after entering the DCS input terminal card (multi-channel terminal board), thus As a result, the display accuracy of the DCS is reduced, and even the actual temperature on s...
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Login to View More IPC IPC(8): G01K7/02G01K7/16G01K1/00
Inventor 蒋远华杨晓勤瞿道兵周会文靖
Owner GUIZHOU XINGHUA CHEM