In the process of using the gas chromatograph, the operator often encounters the problem of fault maintenance of the gas chromatograph. When the main gas chromatograph is used in this paper, the microcomputer control circuit board is not normal for simple analysis. Runde produce end feed brass fittings for European market.the quality satisfy Kitemark, End Feed Brass Fittings , EF brass fittings ,solder joint brass fittings, EN1254 brass fittings ,brass pressure fittings,wrot joint brass fittings. End Feed brass fittings end feed brass fittings,EF brass fittings,solder joint brass fittings,EN1254 brass fittings,brass pressure fittings,wrot joint brass fittings Taizhou Runde Company , https://www.smartfittings.com
Gas chromatograph maintenance points (3)
â–²Microcomputer control circuit board
â—‡ Action: oven temperature, injector temperature, controller temperature control, FID ignition/high pressure switching, split/splitless switching, oven door opening angle control, signal attenuation, for detector board power supply.
◇ Principle: The physical quantity of the temperature sensor (platinum resistance RΩ=100Ω/0°C) (resistance value with temperature) is converted to analog quantity (voltage value linearly related to temperature change) through the linearization circuit at the upper right of the printing plate. ), the VFC is converted into a digital signal, and the computer performs arithmetic processing, and the heating element is controlled by the control element at the lower right of the printing plate. Through the J300, J301, JP4 socket connection line, the ignition, rear door opening, split / splitless, relay switching control. See the schematic.
â—‡ Judgment:
1. Use the multimeter (DC file) to measure the pin 1 of J1 separately.
3rd, 6th, 8th, 11th, and 13th
The ground voltage is +60V, +5V, +15V, -15v,
+18V, -18V.
2. Use a multimeter (DC file) to measure JP4 socket and foot 5
The ground voltage should be +24V.
3. Using a multimeter (DC file), measure the SIGNALI socket
Step 1 to ground voltage, adjust the zero potentiometer (corresponding to J1's magnifying plate) so that the voltage at this point is +0.5V. Then press the function key [ATTA], and then press the number keys [1]~[8] in sequence, respectively. In the foot of the SIGNALI socket, the ground voltage is +0.2500V~+1.96mV.
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn