JPH0794991B2 - Gas concentration measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention measures the concentration of a specific component in a gas, and outputs the data for recording the measured value as a time chart on a recorder or the like. Measuring device.

[Prior Art] A conventional gas concentration measuring device converts a measured gas concentration into an analog output of, for example, a direct current of 0 to 1 [V] on a full scale, and records this on a recording paper on a recorder. The ones that are set are common.

FIG. 2 shows a schematic configuration of a conventional device according to FIG. The gas concentration measuring device 11 is composed of a gas concentration detecting part 12 and an amplifier 13 for amplifying an electric signal from the detecting part 12, and drives a recorder 14 by an analog output from the device 11 to cope with a lapse of measurement time. The change in the gas concentration is recorded as a time chart.

As the gas concentration detection unit 2, for example, an infrared gas analyzer that measures gas concentrations of NOX, SO2, CO, or the like, which is a pollution measuring instrument, or a chemiluminescence analyzer is used.

[Problems to be Solved by the Invention] In the case of a portable measuring device,
Since a recorder, which is separate from the analyzer, is prepared separately, the whole configuration becomes large when moving frequently, which is a major obstacle to moving measurement. Further, the gas concentration measurement is often performed for several hours to several days, and in the conventional configuration as shown in FIG. 2, one measuring device, that is, one analyzer, monopolizes one recorder, It was inconvenient for mobile measurement.

The present invention solves the above problems by temporarily storing measured concentration data in a storage means, and outputting the data by appropriately compressing and outputting the measurement time after the measurement is completed. It is an object of the present invention to provide a gas concentration measuring device which does not require a recorder and which is excellent in portability and which does not require a great deal of time for recording and outputting data and which has good working efficiency.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a detection unit that detects a change in gas concentration over a predetermined time period and outputs an electric signal corresponding to the concentration, and a detection result and time. In a measuring device such as a gas concentration having an output unit for outputting to an external recording device such as a recorder as on-axis analog data, a storage unit for storing a detection value by the detection unit in relation to time, The output unit has a data processing unit that outputs the data stored in the storage unit as analog data whose time axis is compressed in a relationship inversely proportional to the chart speed of the external recording device.

[Operation] According to the above configuration, the gas concentration measurement value is temporarily stored in the storage means, and the user decides how much time length of the measurement value is to be recorded in the time chart, and in accordance with this, Time-compressed analog data can be output. Therefore, by increasing the chart speed of the recorder with this output for recording, it is possible to reproduce the record of the gas concentration measurement for a long time within a short time.

[Example] The configuration of an example of the gas concentration measuring apparatus of the present invention will be described below with reference to FIG.

The device 1 includes a gas concentration detection unit 2 that detects a change in gas concentration and outputs an electric signal corresponding to the concentration, an output unit 3 that outputs a detection result as analog data on a time axis, and a gas concentration detection unit. And a storage memory (storage means) 4 for storing the detected value of 2 in relation to time. The output unit 3 includes a CPU 6, an A / D converter 5 and a D / A converter 7. Further, the recorder 8 is provided with a recorder 8 driven by an analog output from the output unit 3 of the apparatus 1, and the recorder 8 records a change in gas concentration corresponding to a measurement time as a time chart.

Further, the CPU 6 of the output unit 3 has a data processing functional means for outputting the data stored in the storage memory 4 as analog data whose time axis is compressed in a relationship inversely proportional to the chart speed of the recorder 8. An internal memory or an external memory may be used as the storage memory 4.

In the above configuration, the concentration data measured by the gas concentration detection unit 2 is temporarily stored in the storage memory 4, and thereafter,
It becomes possible to output as analog data. However, if analog data is output at a speed equivalent to that at the time of measurement, the recorder 8 is monopolized for the same time as the measurement, which means that it takes twice as long time. Therefore, it is necessary to output the data stored in the storage memory 4 to the recorder 8 in a short time. Therefore, if the chart speed of the recorder 8 driven by the output unit 3 is increased in inverse proportion to the data compression, it is possible to leave the same recording as the simultaneous recording on the recording paper.

Now, comparing the present embodiment with the conventional one, in the conventional configuration shown in FIG. 2, when the chart speed of the recorder 14 is 6 cm / hour and recording is continued for 12 hours, the total recording length is Although it is 72 cm, in the present embodiment, if the data during this period is stored and the analog output is performed at a speed of 60 times, the chart speed of the recorder 8 is 6 cm /
Equivalent data can be reproduced by recording min. The recording time at this time is only 12 minutes, which enables efficient work.

In addition, as described above, the gas concentration measurement is often performed over several hours to several days, and in the conventional configuration, the analyzer 1
Although it was inconvenient to measure the movement by monopolizing one recorder with the stand, this is not the case in the present embodiment.

Of course, during the measurement, the data may be simultaneously recorded in the recorder 8 or only a part of the stored data may be output. Further, the measurement target is not limited to the gas concentration and the like, but can be similarly applied to the measurement of various liquids, contained components such as gas and the like.

[Effects of the Invention] As described above, according to the present invention, the data in which the detection value by the detection unit is stored in relation to time is stored at a rate determined by the relationship between the desired output time and the measurement time of the output target. Since the axes are output as compressed analog data, it is not necessary to prepare a recorder at the time of measurement, and the portability and maneuverability of the measuring device are improved. In addition, the stored measurement data can be output to a recorder or the like in a short time, and the data can be reproduced exactly the same as when the data is recorded at the same time as the measurement.

[Brief description of drawings]

FIG. 1 is a block diagram of a gas concentration measuring device according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional gas concentration measuring device. 1 ... Gas concentration measuring device, 2 ... Gas concentration detector, 3 ...
… Output section, 4 …… Storage memory, 6 …… CPU.

Claims (1)

[Claims] 1. A detection unit that detects a change in gas concentration over a predetermined time period and outputs an electric signal corresponding to the concentration, and outputs the detection result and analog data on a time axis to an external recording device such as a recorder. In an apparatus for measuring gas concentration and the like having an output unit, the storage unit for storing the detected value by the detection unit in relation to time, the output unit, the data stored in the storage unit, An apparatus for measuring gas concentration and the like, comprising data processing means for outputting analog data whose time axis is compressed in an inversely proportional relationship to the chart speed of an external recording device.