Electronic pressure sensors

Thermoelectric flame failure detection Analog burner control systems Safety temperature cut-out Mechanical pressure switch Mechanic/pneumatic gas-air-ration control Thermoelectric flame supervision Thermal combustion products, discharge safety devices Electronic safety pilot Electronic burner control systems Electronic cut-out with NTC Electronic pressure sensor/transmitter Electronic gas-air-ration control with ionisation signal or 02 sensor Ionisation flame supervision Electronic combustions product discharge safety device... 

Electronic polarization, 10 21 Electronic pressure sensors, 20 651-657 Electronic products market, 24 331-333 Electronic properties, of compound semiconductors, 22 150t, 151 Electronic recycling, 21 364 Electronics... 

From the point of view of field insfrumentation for measuring pressure inside fhe combustion chamber, it is possible to use either a glass U-tube manometer filled with fluorescent liquid or an industrial manometer for local measurements and an electronic pressure sensor for remote measurements and collection of data. Reliability and ability to dampen the pressure fluctuation inside the combustion chamber are the advantages of the U-tube and robust industrial manometers. 

Modem equipment uses electronic pressure sensors instead of Hg-manometers and digital technique to measure the vapor pressure. Also thermostating is more precise in recent apparatuses. The apparatus developed by Haynes et al. is shown in Figure 4.4.5 as example. 

The direet pressure measurement has the advantage that absolute pressures can be obtained and pressure fluetuations can be observed. More modem equipment applies electronic pressure sensors instead of Hg-manometers to avoid the problems caused by the... 

Figure 2.47 Injector forward pressure regulation. 1. Carrier gas inlet filter, 2. proportional control valve, 3. electronic pressure sensor, 4. septum purge on/off valve, 5.

Figure 6. Fundamentals of electronic pressure sensors (GaBmann et al., 2010).

The determination of the volume of solvent vaporized in the unoccupied space of the apparams is difficult and can cause serious errors in the determination of the final solvent concentration. To circumvent the vapor phase correction, one can measure the concentration directly by means, for example, of a differential refractometer. The contact of solvent vapor with the Hg surface in older equipment may cause further errors. Complete thermostatting of the whole apparatus is necessary to avoid condensation of solvent vapor at colder spots. Since it is disadvantageous to thermostat Hg manometers at higher temperatures, null measurement instruments with pressure compensation were sometimes used. Modem electronic pressure sensors can be thermostatted within certain temperature ranges. If pressure measurement is made outside the thermostatted equilibrium cell, the connecting tubes must be heated slightly above the equilibrium temperature to avoid condensation. 

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