Abstract: The aim of the invention is to provide a simple and reliable method of measuring the quality of a fluid (2), in particular an oil or fat. This is achieved by a dielectric measurement in conjunction with a temperature measurement, which are carried out in situ by means of a measuring assembly and a sensor assembly (1) used with the latter, whereby the sensor assembly is submerged in the fluid. This permits information concerning the condition of the fluid, in particular concerning the age of the frying oil or fat, to be obtained in a rapid, low-cost manner.

Abstract: A measuring device is disclosed that includes a shaft, a display and/or control unit pivotally supported on an upper end of the shaft, and at least one sensor element disposed in the shaft and operatively connected with the display/control unit. The shaft has at least one foldable shaft section. The device can be operated with one hand and allows flow measurements in channels of varying depth.

Abstract: A waterproof protective device for holding an apparatus having an interaction field is formed from a dimensionally stable protective housing having a lower housing part and an upper housing part. The lower housing part and the upper housing part are releasably hingedly connected with one another and an inside contour of the protective housing is adapted and constructed to closely receive the apparatus with approximately zero play. The protective housing is provided with a transparent, elastically flexible operating area of reduced wall thickness to enable an interaction field to be viewed and manipulated. The operating area may be integral with the rest of the protective housing and may be sufficiently elastically deformable so that pushbuttons on the apparatus may be operated by finger pressure through the protective device under the operating area.

Abstract: A condensate separator for a portable (smoke) gas analyzer has a separating chamber formed inside a housing through which exhaust gasses pass. A condensate-collecting chamber is provided in hydraulic communication with the separating chamber and is at least partially filled with liquid absorbent material. The condensate removed from the exhaust gas is collected by the liquid absorbent material and wicked up through capillary action. Liquid is removed from the liquid absorbent material by a mechanical pump without requiring that the gas analyzer be stopped to drain out the condensate.

Abstract: A method for determining the concentration of a substance in a gaseous medium using a chemical sensor is disclosed. To ensure that the concentration is within the nominal measuring range of the sensor, the sample gas stream is mixed with a diluting gas stream in a mixing device to form a measured gas stream. This mixing process involves setting an adjustable dilution ratio and alternately supplying the sample gas stream and diluting gas stream to the mixing device. By adjusting the amount of time each gas is supplied to the mixing device the dilution ration can be varied to thereby maintain the concentration of the substance detected by chemical sensor within the nominal measuring range of the sensor. Calculation of the concentration of the substance is thus simplified since the dilution ration is automatically a known quantity since the sample gas stream and diluting gas stream are supplied cyclically alternately and in succession with a definite volume flow to measuring device.

Abstract: A condensate separator especially for a portable smoke or gas analyzer includes a condensate chamber (26) formed inside a housing (20) and sealed off from the environment. A gas supply element (30) is inserted into condensate chamber (26) and a gas discharge element (40) is provided to discharge gas from the condensate chamber (26). A Peltier element (10) having a hot side (12) and a cold side (14) is mounted on housing (20) and serves to cool the test gas flowing through condensate chamber (26), with cold side (14) being inserted almost completely into condensate chamber (26) so that it is in direct contact with the test gas. An elongated unheated test gas tube (100) supplies test gas to the condensate separator.

Abstract: A method for preparing a test gas stream for a gas analyzer in which test gas is drawn from a test gas stream by a test gas probe, conducted through a test gas tube to a condensate separator, and then analyzed in the gas analyzer for certain components such as NO.sub.2 and SO.sub.2 for example, with the average flow rate of the test gas stream in the test gas tube being set to a value of at least 1.5 m/s.

Abstract: A method for determining the difference in enthalpy that occurs when a gas stream loaded with water vapor is cooled to a temperature below the dew point temperature, especially for determining its water vapor content (moisture measurement) is disclosed. The device preferably used to perform the method includes a gas cooler having an electrical cooling element and inlet and outlet ports through which a gas stream flows. Measuring devices are provided in the inlet and outlet ports to detect state parameters and through-flow values of the gas stream. The outputs from the measuring devices are evaluated by an evaluation device in connection with the electrical power draw of cooling element to determine the difference in enthalpy between the inlet and outlet ports and/or the water content of the gas stream.

Abstract: This invention relates to a process for determining the state of an electrochemical gas sensor located in an environment with a known and constant concentration of a gas which is to be detected, where said gas to be detected is converted by chemical reaction at a three-phase boundary formed by a measuring electrode, an electrolyte and the gas to be detected, and where a current flowing in an external circuit functions as a sensor signal, whereby for determination of the state of the gas sensor, the external circuit is temporarily interrupted, and during this time the gas sensor is in specific exposure with the gas to be detected, and the resulting transient of the sensor is recorded and evaluated over time after the external circuit is closed.

Abstract: A measuring assembly is described for studying gaseous media, in which a measuring cell (20) connected to a circuit board (40) is clamped into a receptacle (10). The receptacle (10) includes a base plate (11), a pressure plate (30), arms connecting base plate (11) and the pressure plate (30) with each other, i.e., a stud bolt (13) and a connecting arm (14), as well as a pressure spring (16) acting on the pressure plate (30). The pressure plate (11) is supplemented by a chamber cover (15) so as to form a gas chamber (17). Preferably, a filter (50) is located between the base plate (11)/chamber cover (15) and the measuring cell (20).

Abstract: The invention relates to a process and a device for measuring a gas medium with a chemical sensor that has a nominal measuring range. The chemical sensor is exposed to a gas mixture consisting of sample gas stream and dilution gas stream. In order to ensure that the chemical sensor always works within its nominal measuring range, the dilution ratio is readjusted. According to the invention, the dilution ratio is determined by substance concentration measurement of a defined substance component.

Abstract: The flow velocity of the medium is determined with the aid of a temperature-dependent resistor. The measurement probe is located in a partially open measurement chamber. The measurement chamber has an inlet port and an outlet port of different sizes. Only if the flow enters through the smaller inlet port and exits through the larger outlet port, is the actual flow velocity measured. When the flow enters through the outlet port, the measured value is less by about 30%. From this difference the direction of flow can be clearly determined.