HUT67732A - Detector for disgriminating derivatives of petroleum and water - Google Patents

Abstract

In an apparatus comprising a detecting head capable of distinguishing oil derivates from water and means for indicating the detected and measured signals of said detecting head, a power supply cable (3) is introduced into a test head housing (1) and connected via a power supply filter (4) to an AC generator (5). The AC generator (5) is linked via a separating capacitor (6) to at least one first capacitor plate (7). The detecting head further comprises at least one second capacitor plate (8) that is arranged in a distanced parallel relation to the at least one first capacitor plate (7). The at least one second capacitor plate (8) is connected via a rectifier unit (10) and a low-pass filter (11) to an output signal cable (13) leading to the preferably remotely located means for indicating the detected and measured signals of the detecting head.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention for the detection of crude oil derivatives appearing in groundwater, and for the measurement of sheet iron membership.

Water in the soil or container. The determination of the level of a liquid or other liquid is sometimes an important factor, and it may be particularly important to determine what other liquid is present on the surface of the groundwater, e.g. oil derivative layer is present.

Increases in soil contamination can often be detected and measured by groundwater testing, which has only led to results through well-testing of wells or test wells.

Although measuring devices are known for controlling the quality of water and wastewater, they are not suitable for the rapid measurement of the position and amount of oil derivatives in the soil, or for the measurement of the amount of oil derivatives. continuous monitoring.

The increase in soil contamination and the need to identify and measure the occasional crude oil derivatives in the soil have led to the development of a sensor as well as a signaling device to detect the presence of oil floating on the groundwater. its thickness can be determined quickly, easily and precisely in mm.

The solution was made possible by the recognition that the relative permittivity (er) of air and liquids is different, which makes them well distinguishable. Relative air permittivity is er = 1, crude oil without dipoles er = 2 ~ 3, and alcohols containing dipoles, glycerol and water er = 20-80. From the above, it can be concluded that the relative permittivity of air, oil, and water can be determined and measured with appropriate sensor and display equipment.

Accordingly, the present invention is a sensor and an indicating device which is water and crude oil derivatives. can be distinguished by using different relative permittivity of the materials, respectively. their value.

The sensor of the present invention is a suitably designed capacitor which produces a different capacitance at different relative permittivity. Supplying one arm of the capacitor with alternating voltage, directing a signal on the other armor of the capacitor, results in a characteristic of the material between them. liquid. The sensor or sensor. a detector connected to the probe can determine whether the sensor is in air, oil or water. By lowering and raising the sensor the oil derivative can be detected. or the position or level of the water level. thickness of the oil.

The detection and indicating device of the present invention is thus capable of high-precision, automatic determination of the thickness and depth of crude oil derivatives (layers) floating above the water body, well, borehole, tank.

The invention is particularly applicable in the field of environmental work (such as measurement, decontamination, control technologies) relating to soil CH (contamination),

The sensor is suitable for continuous and automatic monitoring mode, where it immediately alarms when a potential contaminant (eg petrol tank) fails.

One preferred embodiment of the present invention will be described with reference to the accompanying drawings.

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-4Figure 1 shows the probe in longitudinal section.

The probe is mounted at the end of the suspension cable of the desired length (14). The housing (1) of the probe contains electronics comprising a power filter (4), an alternator (5), rectifying diodes (10), and a cut-off filter (11). At the bottom of the probe, on the spacers (9) on the insulating sealing plate (12), the sensor portion is a capacitor armature (7) powered by an alternating voltage and a sensor armature (8) having an alternating voltage after the rectifier ) passes a signal characteristic of air, oil, water through a filter. Also located at the bottom of the probe is a perforated protective ring (2) which protects the capacitor arms (7,8) from mechanical damage and by its design ensures the flow of the liquid to be measured. The suspension cable (14) includes the power (3) and output (13) wires connected to the display instrument.

The embodiment and operation of the exemplary embodiment of the sensor according to the invention shown in Figure 1 is as follows:

The probe receives the energy required for operation via the power lines (3) in the suspension cable (14) and the power filter (4).

The signal of the high frequency generator (5) formed from the CMOS NOR gates is applied to the armature of the powered capacitor (7) via the DC voltage isolating capacitor (6). Sensor (8) dielectric-dependent alternating voltage on armor • · • ·· · ·

···· gets to the rectifier (10). The rectified signal passes through the high-frequency suppression filter (11) and the output signal line (13) to the signal gauge.

The output voltage measured in the air dielectric can be considered as a setpoint. can be used to indicate functionality. In the case of oil dielectrics, the set point is about twice the output voltage, while the same is maximal for water.

One preferred use of the sensor of the present invention is to measure the thickness of the oil layer floating on the groundwater. The movement of the suspension cable is detected by a measuring disc which gives one pulse per mm. When the oil reaches the upper limit, the pulse counter resets to zero and then counts to the water level, and then displays the value until the next measurement.

Another use, when the sensor is in monitoring mode at the expected contamination site, is that the display instrument will alert when oil appears.

Claims (4)

Sensing and measuring device for distinguishing oil derivatives and water, having a probe for submerging in the liquid to be measured and a means for indicating the measured signals by means of a suspension cable, characterized in that the power supply line (4) connected via an isolating capacitor (7) to the ac generator (5), the ac voltage generator (5) is connected via the isolating capacitor (6) to the supply capacitor armature (7), The sensor armor (8) is connected to the display instrument via the rectifier (10) and the cut-off filter (11) through the output line (13). Apparatus according to claim 1, characterized in that the measuring sensor housing (1) has an insulating sealing plate (12) separating the power and sensor assemblies (7,8) on the spacers (9) from the interior of the housing. Apparatus according to claim 1, characterized in that the fed condenser arm (7) and the sensing arm (8) are two or more spaced apart spacer rings. • 9 · ♦ «« Apparatus according to claim 1, characterized in that one or more powered condenser arms (7) and sensing arms (8) are arranged in pairs in the probe housing.