JP3095045B2 - Gas concentration continuous analyzer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas concentration measuring device for continuously measuring the concentration of a target component in a sample gas. Examples of the gas concentration measuring device include a device for continuously measuring nitrogen oxides NOx, carbon oxides CO, and CO ₂ in the atmosphere.

[0002]

2. Description of the Related Art A gas concentration measuring apparatus is different from an ordinary batch processing analyzer, and often continuously measures a target component for a long period of time. If the measured value changes significantly during a long-term measurement, the gas concentration is programmed to automatically change the measurement range to the optimum range or to switch to the standard gas periodically and perform calibration. There are also measuring devices. The measurement data is stored in a storage device, and is output to a recorder or a printer.
Output to the outside via an interface such as Usually, only the measurement data of the target component is sequentially stored in the storage device, and the stored measurement data is simply output as the output at the end of the measurement. When the measurement range is changed or other measurement conditions are changed, it is possible to store the measurement conditions such as the measurement range, but usually the measurement conditions are stored for measurement data. It is stored in a storage area prepared separately from the area.

[0003]

The measurement data obtained by the gas concentration measuring device sometimes requires the history of the data including the change of the measurement conditions such as the measurement range and the calibration.
However, since the conventional gas concentration measuring device stores only measurement data, it is not possible to understand the details of the data just by outputting the measurement data. Also, if a storage area for measurement conditions is prepared separately from a storage area for measurement data, it is not known how many times the measurement conditions are changed, so it is necessary to prepare a larger storage capacity. And the storage device is wasted. A first object of the present invention is to reduce waste of storage capacity of a storage device in a gas concentration measurement device. A second object of the present invention is to make it possible to understand the history of data, such as where the measurement conditions have changed during continuous measurement of the gas concentration measurement device and where calibration has been performed, just by looking at the output results. It is to be.

[0004]

According to the present invention, measurement data and measurement condition changes are sequentially stored in the same storage area in the order of appearance. At the time of output, not only the measurement data but also a change in the measurement condition and the like are output together with a mark for identifying the type. The present invention will be described with reference to FIG. The detection unit 2 continuously measures a target component in the sample gas, the input unit 4 gives measurement conditions and the like, and the storage unit 6 is controlled by the judgment control unit 10 to store measurement data and measurement conditions and output. The unit 8 is controlled by the judgment control unit 10 and outputs the measurement data and the like stored in the storage unit 6. The judgment control unit 10 sequentially stores the measurement data in the storage unit 6 and, when an operation other than data acquisition is performed, as data that can identify the type of operation as measurement data at the timing of the operation, and determines whether the operation is measured. When the condition is changed, the measurement condition is also stored in the same storage area of the storage unit 6 as the measurement data.

[0005] When outputting to the output unit 8, the judgment control unit 10 outputs the measurement data stored in the storage unit 6 and handles the data indicating the type of operation stored in the storage unit 6. The mark is output together with the measurement data. The output includes an analog output to a recorder, a digital output to a printer, an output to an external device via an interface such as RS232C, and the like. In the case of analog output, it can be swung to the 0 level or full scale to distinguish the type of operation performed during measurement, and in the case of digital output, the type and content of the operation are displayed numerically. be able to.

[0006]

When the operation for changing the measurement conditions, such as a range change, is automatically performed while the measured value is being stored, or when the introduced gas is automatically changed for performing periodic calibration, or from the input device. When the input signal or external signal is input, the data indicating the type of measurement condition change and the contents of the input signal are stored each time, but those data are regarded as data that cannot be measured data. It is stored in the same storage area. When the storage data is output from the storage device, if it is measurement data, it is output as it is, and if it is other than measurement data such as a change in measurement conditions, it is displayed along with the measurement data as a mark corresponding to those changes in measurement conditions. Make sure you know what happened.

In FIG. 1, the gas concentration measured by the detection unit 2 is taken into the judgment control unit 10 and stored in the storage unit 6.
On the other hand, when a measurement condition such as a range change or a change in the introduced gas is performed, the determination is determined by the determination control unit 10 and stored in the storage unit 6 as data that is impossible as a measured value. When outputting the stored data, the determination control unit 10 reads the data from the storage unit 6 and determines whether the data is measured data or other data. For example, in the case of the analog output, the analog output is output as a mark corresponding to the type, and in the case of the digital output, the output is performed using, for example, characters, symbols, numerical values, and the like.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the configuration of FIG. 1, the judgment control unit 10 is realized by, for example, a CPU. FIG. 2 shows a flow in which continuous measurement is performed and storage of measurement data and changes in measurement conditions are stored in the same storage device. When the measurement starts,
It is determined whether or not the range has been changed (step ST1). Immediately after the range is changed, data that cannot be measured value data as a range change marker, for example, “0FFFF _H ” (hexadecimal data) is stored in the same storage area as the measurement data (step ST2).
After storing the new range together with the old range in the same storage area as the measurement data (step ST3), storing a marker (eg, “0FFFE _H ”) indicating a range change in the same storage area as the measurement data (step ST4), The data is stored (step ST5).

At the start of measurement or immediately after the standard gas is introduced for calibration during the measurement, the process proceeds from step ST1 to steps ST6 and ST7, where a marker indicating the start of standard gas introduction (for example, "0FFFD _H Is stored in the same storage area as the measurement data, and then the measurement data using the standard gas is stored (ST5). At the end of standard gas introduction,
Proceeding to steps ST1, ST6, ST8, and ST9, a marker (for example, "OFFFF
After storing “ _CH ”), the measurement data is stored (step ST5).

When data is input from the keyboard, steps ST1, ST6, ST8, ST10, ST11 are performed.
Then, after storing a marker (for example, “0FFFB _H ”) indicating that a key input has been made, the measurement data is stored (step ST5). If there is an input that you want to store other than the measurement data input and the external input illustrated in FIG. 2,
Similarly, each time the input is made, a marker corresponding to the type may be determined and stored in the same storage area as the measurement data. Also in this case, a data value that cannot be used as measurement data is used as a marker.

When reading stored data, the CPU determines whether the read data is measurement data or a marker. If the data is measurement data, it is output as it is. It is determined from the data whether or not there is, and at the time of output, it is output as a different mark or character according to the type at that timing.

FIG. 3 shows an example of analog output in one embodiment.
Shown in a, b, c, and d indicate markers,
As a display example, a is a display of 0 level, and b and c are -FS.
(Full scale) Marks are displayed in different types, such as swinging to the level and d swinging to the + FS level. In this example, a indicates range change, b indicates standard gas introduction, c indicates standard gas introduction end, and d indicates key input.

As in the embodiment shown in FIGS. 2 and 3, by inserting markers before and after the changed measurement condition, data can be read from behind, that is, reverse scrolling when a graph is displayed on a screen. Be able to respond. As the storage unit, not only the RAM inside the device but also a portable storage medium such as an IC memory card or a floppy disk may be used. In the case of such a storage medium, data can be read out on a computer and output.

[0014]

According to the present invention, the measurement data and the change of the measurement condition are sequentially stored in the same storage area in the order of appearance, so that the storage area is previously determined to have a predetermined size for measurement data and measurement conditions. There is no need to separate them. Therefore, the measurement conditions can be stored no matter how many times the measurement conditions are changed, and the storage device can be used effectively. In the output, not only measurement data but also changes in measurement conditions are output with marks or characters that can identify the type. Recognize.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment.

FIG. 2 is a flowchart showing an example of the operation of the embodiment.

FIG. 3 is a diagram illustrating an example of an analog output.

[Explanation of symbols]

 2 detection unit 4 input unit 6 storage unit 8 output unit 10 judgment control unit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G01N 35/00-35/10 G01D 9/00

Claims (2)

(57) [Claims] 1. A detection unit for continuously measuring a target component in a sample gas, an input unit for providing measurement conditions and the like, and a storage unit for storing measurement data, measurement conditions, and the like controlled by a determination control unit described later. An output unit that is controlled by a determination control unit described below and outputs measurement data and the like stored in the storage unit, and sequentially stores the measurement data in the storage unit, and performs an operation when any operation other than data acquisition is performed. At the timing of the determination, the type of operation can be identified as measurement data, and when the operation is a change of measurement conditions, the measurement conditions are sequentially stored in the same storage area in the order in which they appear together with the measurement data in the storage unit. A continuous gas concentration analyzer comprising a control unit. 2. When outputting to the output unit, the determination control unit causes the measurement data stored in the storage unit to be output and corresponds to the data indicating the type of operation stored in the storage unit. The continuous gas concentration analyzer according to claim 1, wherein the mark is output together with the measurement data.