CN210572098U - Measuring device for measuring the content of oil vapour or other hydrocarbons in a gas - Google Patents
Measuring device for measuring the content of oil vapour or other hydrocarbons in a gas Download PDFInfo
- Publication number
- CN210572098U CN210572098U CN201921034373.5U CN201921034373U CN210572098U CN 210572098 U CN210572098 U CN 210572098U CN 201921034373 U CN201921034373 U CN 201921034373U CN 210572098 U CN210572098 U CN 210572098U
- Authority
- CN
- China
- Prior art keywords
- gas
- hydrocarbons
- measuring
- measuring device
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model provides a measuring device for be arranged in measuring gas oil vapor or other hydrocarbons content, measuring device includes: a PID sensor; a first gas line and a second gas line connected in parallel with the PID sensor, the first and second gas lines each connected at one end to a sample gas inlet and each operably connected at the other end to a gas inlet of the PID sensor; wherein the first gas line and the second gas line are respectively provided with a first valve and a second valve for selectively switching along the gas flow direction; wherein a zero calibration filter is disposed on the second gas line downstream of the second valve in the gas flow direction for filtering out oil vapor or other hydrocarbons from the gas. The whole device can provide convenient, reliable and flexible operation and calibration, thereby easily realizing accurate measurement and measurement error correction.
Description
Technical Field
The utility model relates to a measurement field of oil vapor or other hydrocarbons content in the gas, more specifically say and indicate a measuring device for measuring oil vapor or other hydrocarbons content in the gas.
Background
To detect hydrocarbons in gases, such as air or compressed air, various sensing technologies exist. Such measuring devices are known with various sensing technologies and are used for detecting the content of oil, hydrocarbons and oxidizable gases in, for example, air or compressed air.
For example, one common approach is to use an electrically heated semiconductor oxide material. The semiconductor oxide changes its resistance in a heated state according to the amount of hydrocarbon contained in the air. The most important advantages of metal oxide semiconductor gas sensors include: very high sensitivity and thus the possibility of being able to measure even the smallest hydrocarbon contents down to the ppt range. They have a very long operating life, very good long-term stability and are relatively inexpensive to purchase. However, the metal oxide semiconductor gas sensors have a disadvantage in that they have an exponential characteristic curve, which is why their offset point is difficult to determine. The measurement results are more difficult to reproduce and the sensor has a high lateral sensitivity to water vapor and inorganic gases. The response time of the final value is high and the recovery time is longer in the case of zero air calibration until the zero line is reached.
For different applications of compressed air, different limit values are required for the oil component. The oil component consists of an oil aerosol in the form of small droplets and oil vapour. The removal of oil aerosols and oil vapors from the compressed air stream may be accomplished by various methods. But the measurement of oil in compressed air has hitherto not been a satisfactorily solved problem. There is a high oil content compressed air stream, where the oil content is primarily oil aerosol. Measurement techniques that can be used for hydrocarbon vapors in this concentration range, such as metal oxide semiconductor gas sensor techniques, can only provide very unreliable measurements or no measurements at all due to the small droplet characteristics of the aerosol.
Another approach is to use a supported catalytic element to detect hydrocarbons. For this purpose, the gas flow to be measured is guided through a small sphere of heated catalyst material, in the interior of which a heated platinum wire is present. The amount of hydrocarbon can be measured by the change in resistance of the heated platinum wire or a second platinum wire, which is adjusted by the heat of combustion of the hydrocarbon on the catalyst. Flame ionization detectors are also used. Therein, hydrocarbons are combusted in a gas stream and the voltage change between two electrodes in the flame is measured.
Another method is to detect hydrocarbons using photoionization. In the process, the device is irradiated with strong ultraviolet light
The above hydrocarbons. The energy of the light must be so high that electrons are knocked out of the hydrocarbon. Two electrodes can be used to measure their amount. The minimum required photon energy is 8.5 to 9.2eV for aromatic hydrocarbons and 9.0 to 12.6eV for flammable hydrocarbons. The measured values generated with photoionization detectors can mostly only be derived indirectly from the measured substance quantity, since they also depend on the molecular formula of the compound and can vary considerably even for the same general formula. The concentration of hydrocarbons can be measured very well if the compound to be measured is constant, known and as consistent as possible.
During the photoionization mode of detecting hydrocarbon concentration, hydrocarbons are irradiated with ultraviolet light. In this case, the light energy is high enough to force the electrons away from the hydrocarbon molecules. Their number can be measured electronically. Photoionization sensors have good long-term stability, and low lateral sensitivity to water vapor and inorganic gases. The response time of the final value is short and the recovery time is also short in the case of zero air calibration until the zero line is reached. The characteristic curve is linear, providing a high level of reproducibility. However, such photoionization sensors have disadvantages of high maintenance costs and high purchase costs. The measured values produced by means of photoionization sensors only allow an indirect summarization of the amount of the measured substance, since the measured values also depend on the molecular configuration of the compound and vary to a considerable extent, even in the case of the same molecular formula. However, if the compound to be measured is constant, known, and if possible homogeneous, the concentration of the hydrocarbon content can be measured more reliably. However, as the hydrocarbon concentration decreases, the measurement accuracy decreases. Specifically, the effect of the moisture content of the air increases in the process. As the hydrocarbon content decreases, the effect of air humidity becomes progressively greater; the measurement of the hydrocarbon content in the lower range cannot be made with sufficient accuracy.
The analysis and evaluation of hydrocarbons with flame ionization detectors for test gases and reference control gases is described in DE 69122357T2 and in US 4891186A cited therein.
DE 3312525a1 describes a device for measuring the distribution ratio of a bypass (verzweigger) gas flow.
In DE 4120246a1, the gas to be measured with a flame ionization detector is diluted with a mixing device to reduce the risk of explosion.
From DE 19609582C2 it is disclosed to mix a specific reaction gas into a combined photoionization-ion mobility spectrometer for the detection of substances with weak proton affinity.
An infrared gas analyzer with an integrated oxidation catalyst, which is not described in detail, is described in DE 19712823a 1. The air to be measured for the reference measurement can be dried due to the large disturbing influence of the water also using a dehumidifying device.
There is a need in the art for an improved measuring device and method for measuring the oil or other hydrocarbon content of a gas, the concept of which enables convenient, reliable and flexible operation and calibration, so that accurate measurements and measurement error corrections are easily achieved, and which is cost-effective.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide a measuring device for measuring the content of oil vapor or other hydrocarbons in gas.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a measuring device for measuring the content of oil vapour or other hydrocarbons in a gas, the measuring device comprising:
a PID sensor;
a first gas line and a second gas line connected in parallel with the PID sensor, the first and second gas lines each connected at one end to a sample gas inlet and each operably connected at the other end to a gas inlet of the PID sensor;
wherein the first gas line and the second gas line are respectively provided with a first valve and a second valve for selectively switching along the gas flow direction;
wherein a zero calibration filter is arranged on the second gas line downstream of the second valve along the gas flow direction, and the zero calibration filter is used for filtering and removing oil vapor or other hydrocarbons in the gas;
wherein, in a zero calibration mode of the measuring device, the first valve is switched to an off state and the second valve is switched to an on state, thereby allowing gas to flow from the sampling gas inlet, through the zero calibration filter of the second gas line, for filtration and purification into oil-free zero-marked gas, and to the PID ionization sensor, which collects and stores the current standard zero-marked gas value for calibrating the measuring device;
wherein in a normal operating mode of the measurement device, the first valve is switched to an on state and the second valve is switched to an off state, thereby allowing gas to pass from the sampling gas inlet to the PID sensor via the first line for normal measurement of sampling gas.
The further technical scheme is as follows: the zero calibration filter is packed with zeolite or a combination of activated carbon and zeolite.
The further technical scheme is as follows: the first valve and the second valve are both solenoid valves.
The further technical scheme is as follows: the measuring device is an oil vapor gauge configured to detect the content of oil vapor or other hydrocarbons in the gas.
The further technical scheme is as follows: the zero calibration filter is a zero calibration filter that performs automated calibration.
The further technical scheme is as follows: and a drying element is arranged upstream of the PID sensor and used for drying the gas.
Compared with the prior art, the utility model beneficial effect is: the utility model relates to a measuring device for be arranged in measuring gas oil vapor or other hydrocarbons content, under measuring device's zero calibration mode, first valve switches to the off-state and the second valve switches to the on-state, thereby it becomes the mark zero gas that does not contain oil to allow gaseous zero calibration filter that flows the second gas circuit from the sampling gas entry to filter and purify, and it reachs PID ionization sensor to flow in, the numerical value of PID sensor collection storage current standard zero gas is used for calibrating measuring device periodic execution zero calibration function, with the drift of zero point of eliminating the PID sensor. The method is characterized in that the air collected by input is purified, so that clean oil-free air is obtained, and the measured clean air value is used as a reference, so that the drift of the sensor is offset. The whole device can provide convenient, reliable and flexible operation and calibration, thereby easily realizing accurate measurement and measurement error correction.
The invention is further described with reference to the accompanying drawings and specific embodiments.
Drawings
Fig. 1 is a calibration block diagram of a measuring device for measuring the content of oil vapor or other hydrocarbons in a gas according to the present invention.
Reference numerals
1 sample gas inlet 2 first valve
3 second valve 4 zero calibration Filter
5 PID sensor
Detailed Description
In order to more fully understand the technical content of the present invention, the technical solution of the present invention will be further described and illustrated with reference to the following specific embodiments, but not limited thereto.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is also changed accordingly, and the connection may be a direct connection or an indirect connection.
In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
In this specification, "/" means "or" unless otherwise specified "
As shown in fig. 1, a measuring device for measuring the content of oil vapour or other hydrocarbons in a gas, the measuring device comprising:
a PID sensor 5;
a first gas line and a second gas line connected in parallel with the PID sensor 5, both connected at one end to the sample gas inlet 1 and each operatively connected at the other end to the gas inlet of the PID sensor 5;
wherein, a first valve 2 and a second valve 3 for selectively switching are respectively arranged on the first gas line and the second gas line along the gas flow direction;
wherein, a zero calibration filter 4 is arranged on the second gas line at the downstream of the second valve 3 along the gas flow direction, and the zero calibration filter 4 is used for filtering and removing oil vapor or other hydrocarbons in the gas;
in the zero calibration mode of the measuring device, the first valve 2 is switched to an off state and the second valve 3 is switched to an on state, so that gas is allowed to flow from the sampling gas inlet 1, pass through the zero calibration filter 4 of the second gas line, be filtered and purified into oil-free zero marking gas and flow into the PID ionization sensor, and the PID sensor 5 collects and stores the value of the current standard zero marking gas for calibrating the measuring device;
wherein in a normal operation mode of the measuring device the first valve 2 is switched to an on-state and the second valve 3 is switched to an off-state, thereby allowing gas to pass from the sample gas inlet 1 via the first line to the PID sensor 5 for normal measurement of the sample gas. The zero point calibration function is performed periodically to eliminate the zero point drift of the PID sensor 5. The air collected by input is purified, so that clean oil-free air is obtained, and the measured clean air value is used as a reference, so that the drift of the sensor is offset.
In particular, the entire device can provide convenient, reliable and flexible operation and calibration, thereby easily achieving accurate measurement and measurement error correction.
Specifically, as shown in fig. 1, the zero point calibration filter 4 is packed with zeolite or a combination of activated carbon and zeolite. Zeolites or activated carbon are used to filter out oil vapors or other hydrocarbons from the gas.
Specifically, as shown in fig. 1, the first valve 2 and the second valve 3 are both solenoid valves. The control is simple, and the switching operation is convenient.
In particular, the measuring device is an oil vapor gauge configured for detecting the content of oil vapor or other hydrocarbons in the gas.
Specifically, as shown in fig. 1, the zero-point calibration filter 4 is the zero-point calibration filter 4 that performs the automated calibration.
Specifically, as shown in fig. 1, a drying element is further provided upstream of the PID sensor 5 for drying the gas.
As shown in fig. 1, a measuring method for measuring the content of oil vapor or other hydrocarbons in gas is based on a measuring device for measuring the content of oil vapor or other hydrocarbons in gas as described in any one of the above items, and the method comprises the following steps:
in a zero calibration mode of the measuring device, the first valve 2 is switched to an off state and the second valve 3 is switched to an on state, so that gas is allowed to flow from the sampling gas inlet 1, pass through the zero calibration filter 4 of the second gas line, are filtered and purified to become oil-free zero-marked gas and flow to reach the PID ionization sensor, and the PID sensor 5 collects and stores the value of the current standard zero-marked gas for calibrating the measuring device; and
in a normal operating mode of the measuring device, the first valve 2 is switched to an on-state and the second valve 3 is switched to an off-state, allowing gas to pass from the sample gas inlet 1 via the first line to the PID sensor 5 for normal measurement of the sample gas; and
in the shut-down mode of the measuring device, both the first valve 2 and the second valve 3 are switched to the open state. The zero point calibration function is performed periodically to eliminate the zero point drift of the PID sensor 5. The air collected by input is purified, so that clean oil-free air is obtained, and the measured clean air value is used as a reference, so that the drift of the sensor is offset. Convenient, reliable and flexible operation and calibration can be provided by the measuring method for measuring the content of oil vapor or other hydrocarbons in gas, so that accurate measurement and measurement error correction can be easily achieved.
In particular, as shown in fig. 1, the method further comprises, in a shutdown mode of the measuring device, closing the sample gas inlet 1.
In particular, the gas is dried by means of a drying element before being fed to the photo ionization sensor.
Specifically, the gas is one selected from the group consisting of air, oxygen, nitrogen, compressed air, and carbon dioxide.
To sum up, the utility model relates to a measuring device for measuring oil vapor or other hydrocarbons content in gas, under measuring device's zero calibration mode, first valve switches to off-state and the second valve switches to the on-state to allow gaseous zero calibration filter that flows the second gas circuit from the sampling gas entry to filter and purify and become the mark zero gas that does not contain oil, and the inflow reachs PID ionization sensor, the numerical value of PID sensor collection storage current standard zero gas is used for calibrating measuring device periodic execution and carries out zero calibration function, drift in zero with the elimination PID sensor. The method is characterized in that the air collected by input is purified, so that clean oil-free air is obtained, and the measured clean air value is used as a reference, so that the drift of the sensor is offset. The whole device can provide convenient, reliable and flexible operation and calibration, thereby easily realizing accurate measurement and measurement error correction.
The technical content of the present invention is further described by the embodiments only, so that the reader can understand it more easily, but the embodiments of the present invention are not limited thereto, and any technical extension or re-creation according to the present invention is protected by the present invention. The protection scope of the present invention is subject to the claims.
Claims (6)
1. A measuring device for measuring the content of oil vapour or other hydrocarbons in a gas, the measuring device comprising:
a PID sensor;
a first gas line and a second gas line connected in parallel with the PID sensor, the first and second gas lines each connected at one end to a sample gas inlet and each operably connected at the other end to a gas inlet of the PID sensor;
wherein the first gas line and the second gas line are respectively provided with a first valve and a second valve for selectively switching along the gas flow direction;
wherein a zero calibration filter is arranged on the second gas line downstream of the second valve along the gas flow direction, and the zero calibration filter is used for filtering and removing oil vapor or other hydrocarbons in the gas;
wherein, in a zero calibration mode of the measuring device, the first valve is switched to an off state and the second valve is switched to an on state, thereby allowing gas to flow from the sampling gas inlet through the zero calibration filter of the second gas line for filtration and purification into oil-free zero labeled gas and flow to the PID sensor, and the PID sensor collects and stores the current standard zero gas value for calibrating the measuring device;
wherein in a normal operating mode of the measurement device, the first valve switches to an on state and the second valve switches to an off state, thereby allowing gas to reach the PID sensor from the sample gas inlet via the first gas line for normal measurement of sample gas.
2. A measuring device for measuring the content of oil vapour or other hydrocarbons in a gas according to claim 1, characterised in that the zero calibration filter is packed with zeolite or a combination of activated carbon and zeolite.
3. A measuring device for measuring the content of oil vapour or other hydrocarbons in a gas according to claim 1, characterised in that the first and second valves are solenoid valves.
4. A measurement device for measuring the content of oil vapour or other hydrocarbons in a gas according to claim 1, characterised in that the measurement device is an oil vapour meter configured for detecting the content of oil vapour or other hydrocarbons in the gas.
5. A measuring device for measuring the content of oil vapour or other hydrocarbons in a gas according to claim 2, characterised in that the zero calibration filter is a zero calibration filter performing an automated calibration.
6. A measuring device for measuring the content of oil vapour or other hydrocarbons in a gas according to any one of claims 1-5, characterised in that a drying element is arranged upstream of the PID sensor for drying the gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921034373.5U CN210572098U (en) | 2019-07-04 | 2019-07-04 | Measuring device for measuring the content of oil vapour or other hydrocarbons in a gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921034373.5U CN210572098U (en) | 2019-07-04 | 2019-07-04 | Measuring device for measuring the content of oil vapour or other hydrocarbons in a gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210572098U true CN210572098U (en) | 2020-05-19 |
Family
ID=70641373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921034373.5U Active CN210572098U (en) | 2019-07-04 | 2019-07-04 | Measuring device for measuring the content of oil vapour or other hydrocarbons in a gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210572098U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110208359A (en) * | 2019-07-04 | 2019-09-06 | 希尔思仪表（深圳）有限公司 | For measuring the measuring device and measuring method of Oil in circulating gas steam or other hydrocarbon contents |
-
2019
- 2019-07-04 CN CN201921034373.5U patent/CN210572098U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110208359A (en) * | 2019-07-04 | 2019-09-06 | 希尔思仪表（深圳）有限公司 | For measuring the measuring device and measuring method of Oil in circulating gas steam or other hydrocarbon contents |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8584505B2 (en) | Measuring instrument and method for detecting the content of oil, hydrocarbons and oxidizable gases in air or compressed air | |
| CN101368921B (en) | High sensitivity and high-selective gas transducer | |
| US6165347A (en) | Method of identifying a gas | |
| CN102109487B (en) | Ultra-low concentration gas sensor | |
| US10948207B2 (en) | Air purifier and air purification method | |
| CN1687765A (en) | Portable gas detector | |
| CN106970182A (en) | A kind of apparatus and method of on-line checking mixed gas concentration | |
| CN206772932U (en) | A kind of device of on-line checking mixed gas concentration | |
| DE10125837A1 (en) | Method and detector for the detection of gases | |
| US9222905B2 (en) | Device for the selective detection of benzene gas, method of obtaining it and detection of the gas therewith | |
| CN210572098U (en) | Measuring device for measuring the content of oil vapour or other hydrocarbons in a gas | |
| US6360584B1 (en) | Devices for measuring gases with odors | |
| KR200453056Y1 (en) | Volatile Organic Compounds Detector | |
| CN108139348B (en) | Refrigerant analyzer and method of use | |
| EP1099949B1 (en) | Device for measuring gases with odors | |
| CN110208359A (en) | For measuring the measuring device and measuring method of Oil in circulating gas steam or other hydrocarbon contents | |
| Miller et al. | A versatile electrochemical monitor for air-quality measurements | |
| Liu | Hydrogen Sulfide | |
| Wiegleb | Physical-Chemical Gas Sensors | |
| DE SOUZA | Continuous Automated Analysis of Gases and Particulates in the Pulp and Paper Industry | |
| Herrick et al. | Sulfur Oxide Analyzers | |
| Tipping | Measurement of oxygen content in gases | |
| RU102809U1 (en) | SENSITIVE ELEMENT OF A GAS SENSOR | |
| RU2343470C1 (en) | Detecting element of gas sensor | |
| Ackley | Hydrogen sulfide generation and detection system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |