A vacuum pressure transmitter is installed on the vacuum negative pressure pipeline, and the vacuum pressure signal is sent into an electric signal and sent to the air pressure central control PLC, and the vacuum pressure is displayed on the monitoring microcomputer of the central control room, which is convenient for the operator to negative pressure Monitor the pipeline pressure to understand the operation of the vacuum machine. The cooling system of the control cabinet is combined with the internal space of the VS20 vacuum machine and the position of the control cabinet. A vent hole is opened in the upper left corner of the control cabinet of the vacuum machine, and the axial flow fan is installed on the vent hole, the axial flow fan Start and stop with the vacuum machine; also open the air intake hole under the control cabinet, so that the air inside the control cabinet flows, reduce the temperature inside the control cabinet, and facilitate the heat dissipation of components. Control circuit improvement The host control circuit before improvement: When starting, press the start button, the MX contact of the control board is closed, the soft starter controls the start and run of the host; when stopped, press the stop button to control the board The MX contact is disconnected and the soft starter controls the host to stop. The improved host control circuit diagram before the improvement of the host control circuit: the improved host part of the circuit and other control circuits are unchanged. Improved working principle of the host electrical control circuit: During operation, after closing the power switch, press the start button to control the upper contact MX to close, the intermediate relay A4 is energized, and its normally closed contact is closed; the soft starter begins to control The host starts normally. When the soft starter is started, its running contacts 13 and 14 are closed. Relay A2 is energized, self-locking, its normally closed contact is disconnected, A4 relay is de-energized, soft starter No. 1 terminal When the power is lost, the soft starter is out of operation; at the same time, the normally open contact of A2 is closed, the KM coil is energized, and the installed contactor is put into operation; the main engine is running normally. When stopped, press the stop button, the contact MX on the control circuit board is disconnected, the host control power is cut off, and the host stops running. The local/remote switch realizes the conversion of local/remote operation. When disconnected, the local button operates the vacuum machine to start and stop; when closed, the microcomputer controls the vacuum machine to start and stop. Low-temperature 2-color Ratio Pyrometer
This classification includes two color infrared pyrometers measuring range is 250℃-2200℃.
Compared with one color infrared pyroemter, two color pyrometer measuring result will not change with state of object surface (surface roughness or surface chemical state), that means two color infrared thermometer accuracy will not be affacted, while the 1-color pyrometer will.
Products in this classification are usually applied to metallurgical industry(rod and wire mills, Hot rolling mills), foundry, cement kiln, induction heating, heat treatment, heating furnace, vacuum furnace, monocrystalline silicon, polysilicon, semiconductor and other industrial temperature measurement.
two color pyrometer, two color infrared pyrometer, 2-color infrared pyrometer, ratio pyrometer Changzhou Sijie Optoelectronics Technology Co.,Ltd. , https://www.sjinfrared.com
The optical part of pyrometer, such as glass, will accumulate some dust in the surfac after using for a period. Water, gas, oil vapour, dust in the air will reduce the emissivity coefficient, so the monochromatic pyrometer will reduce the measured value at this time. The Dual color pyrometer measures the ratio of infrared radiation intensities of two band wavelength in a specific range. With dust, water vapor and other disturbances, the signals of two wavelength fall simultaneously and the ratio remains constant after division. And user just need to wipe the glass when it is too dirty.
Monochromatic thermometers cannot measure objects smaller than the field of view. When the object does not fill the field of view, the measurement temperature will be low. A bicolor pyrometer can measure objects smaller than the field of view.