Stocked items can usually be found in the “Ordering Table” and can generally be shipped same day.įor help with selecting a gauge, please use the KJLC Selection Guide, refer to the Gauging Tech Notes, or simply email for further information. Please see the individual product pages for further information. For the facile replacement of present transducers, the output signal is adapted to. In addition to their standard digital RS485 interface, they are optionally available with an analog 0-10 V, EtherCAT or Profinet interface. On top of standard pressure measurement, KJLC can also offer complete solutions for process control, covering Capacitance Manometers, Mass Flow Controllers, and Throttle Valves. The Smartline vacuum transducers VSI (cold cathode) and VSM (Pirani / cold cathode) measure in a range of 5×10-9 mbar. Such devices are simple in concept but difficult to design and construct, in practice, with the currents, voltages, beam cross-sections, and beam divergences of interest for many applications. Whether the application require a simple Thermocouple Gauge to reach medium vacuum, a Cold Cathode gauge to reach UHV, or a Combination gauge to measure the entire range, KJLC can cover it. In its simplest form, a device that can produce such a beam is a cold cathode vacuum diode in which the electrons are produced through field emission from the cathode and accelerated through a foil anode into the transport region. Unlike hot filament sensors, our cold cathodes are contamination resistant and can be easily cleaned to extend their lifespan saving you time and money. Lesker Company ® offers a wide variety of vacuum gauges and transducers that cover a range from UHV to ATM. The Fredericks Company’s Televac cold cathode gauges indirectly measure absolute pressure by ionizing gas in the presence of a magnetic field. Cold cathode gauge heads to TPG 500 Product description Measurements in UHV up to 1 10 -11 hPa with triax-cable (max. Direct connect to Edwards TIC / TAG Pump Controller.Pumping speeds of both types of gauge are of magnitude 10 −2 l/s, so that gauge pumping is usually negligible.Edwards AIM Active Inverted Magnetron Cold Cathode Starting of the discharge in a CCG may be delayed at ultrahigh vacuum (UHV). The CCG is subject to discontinuities in the current versus pressure characteristic. The lower limit of the HCG is set by x‐ray photocurrent and electron impact desorption. The filament heating power of the HCG is sufficient to cause local outgassing of adsorbed material, and possibly large pressure errors. Both types of gauge are susceptible to contamination. High-power high-frequency devices such as the TWT are. These are different in that they do not require a large, high-voltage ballast, but they rather run 'cold', with small inverters that amplify voltage to activate a paint coating inside of the tube. Relative sensitivities for different gases are not the same for different HCGs or CCGs, or for HCGs compared to CCGs. The cold cathode is a device for electron field emission replacing the hot filament in vacuum electronics. Cold Cathodes, or Cold Cathode Fluorescent Lights (CCFLs) are very similar to a normal fluorescent tube used in lighting many offices and signs. Indications of both types of gauge are gas dependent. In the cold cathode gauge (CCG) it is a circulating space charge current of electrons trapped in crossed electric and magnetic fields. Our huge selection of cold cathode lamps and computer case lights will fit every case modders needs. Similar in configuration to the inverted magnetron gauge, the 525 starts at very low pressures where ordinary cold cathode gauges are difficult to start. It is used in gas-discharge lamps, such as neon lamps, discharge tubes, and some types of vacuum tube. note 1 A cathode may be considered 'cold' if it emits more electrons than can be supplied by thermionic emission alone. Sudden exposures to atmospheric pressure will not cause any damage. A cold cathode is a cathode that is not electrically heated by a filament. Two types exist: In the hot cathode gauge (HCG) the source of the ionizing electrons is a thermionic cathode. The Agilent durable and rebuildable 525 cold cathode ionization gauge tube measures pressures from 1 x 10 -8 to 1 x 10 -2 Torr (1 x 10 -8 to 1 x 10 -2 mbar) and has excellent repeatability, accuracy, and reliability. Some examples are electrodes in neon lights, cold-cathode fluorescent lamps (CCFLs) used as backlights in laptops, thyratron tubes, and Crookes tubes. They may emit electrons by field electron emission, and in gas-filled tubes by secondary emission. Ionization gauges are commonly used for pressure measurement from the lowest achievable pressures to 10 −2 Torr. Main article: Cold cathode This is a cathode that is not heated by a filament.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |