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1. Turn on the power of the detection device. The light on the switch is off, there is no indication of the upper and lower temperatures, the fuse is broken, and the fuse is replaced.
Second, the boot in the carbon, sulfur data frame, the value of the carbon pool and sulfur pool value does not change. The occurrence of such failure is generally caused by no serial data. The inspection method is as follows:
(1) Turn off all power and repeat the operation several times in accordance with the "Operational procedure from turning on the power to normal operation". The signal data is still not displayed on the screen.
(2) Turn off the power Check that the serial cable plug is not loose. Unplug the cable and plug it in again. After turning on the power, no data is transmitted.
(3) Use an extended circuit board to pull out the main board in the control box, and use a multimeter to measure whether the 5V power supply of the main board is normal. If not, check the power board. It may be determined that the three chips of the 89C51, GAL, and 232 chips on the motherboard are damaged.
(4) The above checks are all normal. Turn on the power and observe the data in the screen carbon data box. This shows that the A/D7135 chip and its peripheral circuits corresponding to the carbon pool are good. Conversely, there may be problems with the components on the sampling board or the 8155 chip on the main board, which is caused by the poor ±5V power supply for A/D and the reversed printed circuit board.
(5) In the above inspection process, if it is determined that there are problems with the chips or there is a problem with the power supply, the solution is to replace the chip or replace the corresponding printed circuit board.
Third, the serial data transmission, but the carbon pool or sulfur display signal value is not normal checking method is as follows:
(1) If the data appears 2V or more, it is certain that there is a problem with the 7135 chip or its peripheral circuits on the corresponding A/D sampling board.
(2) If the screen data jumps, it must be detected by the digital multimeter at the same time. If the number on the multimeter is normal, it means there is something wrong with the device on the sampling board. If the multimeter measurement data is also not normal, there may be a problem with the front panel.
(3) If the displayed data is very small below 0.05V, there may be a problem with the light source or the modulating motor in the measuring cell. At this point, you can first observe whether the voltages in the F2 function are normal. Check if the motor is normal or not. It can be judged by hand holding down the motor with slight vibration.
The microcomputer infrared carbon-sulfur analyzer is an intelligent infrared analysis and measurement instrument composed of an arc-induction combustion furnace and a computer with a pyroelectric sensor as the core. The analysis is based on single-chip digital circuit control, with functions such as calibration storage, automatic analysis, and parameter setting. It is mainly used for the analysis of carbon and sulfur contents in ferrous metals, nonferrous metals and other materials in the metallurgy, machinery, commodity inspection, scientific research, and chemical industries. How to determine the failure of carbon sulfur analyzer, the following methods can be referenced: