Room temperature sensors

The airflow rate to each room is controlled by a damper operated as a function of the room temperature. Sensors that measure the COt concentration in the room air provide an extra mode of control, in addition to that of air temperature. 

We stress that the above picture of the spectroscopy of metal complexes is an extremely simple-minded view of what can be an exceptionally complicated topic, although we do touch on most of the features important for room temperature sensors. 

Varghese, 0. K. Mor, G. K. Grimes, C.A. Paulose, M. Mukherjee, N. (2004) A titania nanotube array room-temperature sensor for selective detection of hydrogen at low concentrations. J Nanosci Nanotechn 4 733-737... 

Room temperature sensors based on a V2O5-graphite cathode and a polyethylene oxide-based electrolyte were reported by Sathiyamoorthi etal. [55]. The gas is sampled through the porous cathode and for both chlorine and fluorine good sensitivity and rapid response times were observed. 

Shimizu Y etal 1989 The sensing mechanism in a semiconducting humidity sensor with platinum electrodes J. Electrochem. Soc. 136 3868-71 Lukaszewicz J P 1991 Diode-type humidity sensor using perovskite-type oxides operable at room temperature Sensors Actuators B 4 227-32 Anderson RC etal 1990 Investigations of porous silicon for vapor sensing Sensors Actuators A 23 835-9... 

Herran, J., Fernandez-Gonzalez, O., Castro-Hurtado, I., Romero, T., Mandayo, G. G. and Castano, E. (2010), Photoactivated solid-state gas sensor for carbon dioxide detection at room temperature . Sensors and Actuators B Chemical, 149,2, 368-72. 

A.A. Sagade, R. Sharma, Copper sulphide (CuxS) as an ammonia gas sensor working at room temperature. Sensors and Actuators B 133 (2008) 135-143. 

We realized an Eddy current SQUID system of the high frequency type a room temperature Eddy current probe is connected to a SQUID sensor at hquid nitrogen temperature. Fig.3 gives an overview over the components of the system, fig, 5 shows a schematic diagram of the electronics. 

For a room temperature eontrol system, the first requirement is to deteet or sense ehanges in room temperature. The seeond requirement is to eontrol or vary the energy output from the gas fire, if the sensed room temperature is different from the desired room temperature. In general, a system that is designed to eontrol the output of a plant must eontain at least one sensor and eontroller as shown in Figure 1.5. 

Fig.4.11. The initial rates v of increase and decrease of electric conductivity of the sensor (/) and adsorbent (2), as functions of the adsorbent temperature ( z), and the Arrhenius plot (b) corresponding to curve (a). The sensor (ZnO) is kept at room temperature.

Note in conclusion, that similar problem can he solved at temperatures of the liquid lower than room temperature. At lower temperatures one may expect longer times of establishing stationary electric conductivity of the sensor, in the first place due to lower rate constant of the reaction between adsorbed oxygen and solvent. Consequently, at lower... 

The first step of surveying was represented by studying the nature of heterogeneous deactivation of singlet oxygen on a surface of oxidized and partially reduced zinc oxide [102] with the aid of semiconductor sensors. At room temperature and the pressure of O2 10 Torr, the value of y for de-exciting 02( A ) in ZnO is equal or approximately... 

It is known [16] that at room temperature antimony evaporates as molecules. The molecules of antimony according to [17] do not affect conductivity of the sensor made of zinc oxide. Similar conclusion can be obtained from experiments with freshly reduced antimony films. It occurs that without initial adsorption of hydrogen atoms one fails to detect any signals from the sensor in contrast to experimental data (see Fig. 6.2). The resistivity of the sensor remains constant for any distance from the surface of the antimony film. Consequently, the signals of the sensor detected in experiment are not linked with effects of the antimony particles on the sensor. 

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