JPS59580Y2 - COD automatic measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an automatic COD measurement device that can automatically measure and record COD (chemical oxygen demand) in a solution.

In the case of automatic COD measurement equipment, complete continuous measurement is difficult because pretreatment and chemical reactions must be counted at certain times.

Therefore, in the past, so-called intermittent measurement, in which measurements are repeated every few minutes to an hour, has been the mainstream.

As conventional recording methods, there have been proposed analog recording methods such as a pen type or lighting type using a potentiometer, and a digital recording method using a printer.

However, in the former case, the measured CO is immediately available from the record.
It is difficult to recognize the D value, while in the latter case, each recorded measured COD value can be immediately recognized, but it is difficult to grasp the overall fluctuation trend of the measured values.

Furthermore, since both only record the measured COD value,
The disadvantage is that there is insufficient information to understand trends in COD concentration fluctuations.

In view of the above-mentioned drawbacks of the conventional technology, the present invention has developed a COD system that can digitally record the measured COD value, calculate the percentage of the measured COD value, and record it in analog form.
It provides an automatic measuring device.

An embodiment of the present invention will be described below based on the drawings.

FIG. 1 shows a block diagram of the main parts of the automatic COD measuring device according to the present invention, in which 1 is an input terminal for inputting an analog signal (measured COD value) obtained by the automatic COD measuring device;
2 is an A/D converter that converts the analog signal sent through the input terminal 1 into a digital signal, 3 is a measurement range setting device that sets the full scale value of the measurement range, and 4 is the setting device 3. 5 is a calculation unit that corrects the digital value from the A/D converter 2 according to the setting range; 5 is a ratio calculation unit that calculates the percentage of the digital value from the calculation unit 4 with respect to the full scale value; 6 is a ratio calculation unit that calculates the percentage of the digital value from the calculation unit 4; An input terminal for inputting monitoring signals such as a measured value upper limit alarm signal and a maintenance raw signal, 7 a clock circuit for outputting a time signal, and 8 appropriate transfer of signal information from the input terminal 6 and clock circuit 7 to the printer interface 9. A human output control circuit 10 is a dot printer that records various information sent via the printer interface 9 in digital or analog form.

According to the above configuration, the analog signal (measured COD value) inputted from the input terminal 1 is converted into a digital value by the A/D converter 2, and further converted into a digital value by the calculation section 4 according to the range set by the measurement range setting device 3. Corrected.

The correction value is then transferred to the dot printer 10 via the next-stage printer interface 9, where it is transferred to the second dot printer 10.
Numbers are printed on the recording paper as shown in A in the figure.

On the other hand, the digital value (measured COD value) output from the calculation section 4 is transferred to the next stage ratio calculation section 5, where the percentage of the digital value with respect to the set full scale value is calculated.

The calculated percentage information is sent to the dot printer 10 via the printer interface 9 at the next stage, where it is recorded in the form of a bar graph at a position corresponding to the printed measured COD value, as shown at the beginning of FIG.

Furthermore, if time information is output from the clock circuit 7 at this time, that information is transferred to the dot printer 10 by the input/output control circuit 8 via the printer interface 9.

Then, the measurement times are printed at corresponding positions on the recording paper, as shown in FIG. 2C.

Further, if a monitoring signal is input from the input terminal 6 at this time, the signal information is printed at an appropriate position, so that the operating status of the device can also be grasped.

As explained in detail above, according to the COD automatic measuring device according to the present invention, it is easy to recognize the measured COD value, and
Fluctuation trends in all measured COD values can be immediately grasped.

Furthermore, since the measurement time of the measured COD value can be recorded at the same time, it is also possible to grasp temporal fluctuations in the measured COD value.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the main parts of an automatic COD measuring device according to the present invention, and FIG. 2 is a diagram showing an example of recording by the same device.

Claims (1)

[Scope of utility model registration request] a converter that converts the measured COD value into digital information;
a measurement range setter that can set the full scale value of the measurement range in advance; a calculation section that corrects the digital information derived from the converter according to the setting range of the setting device; COD automatic measurement characterized by comprising: a ratio calculation section that calculates a percentage with respect to a scale value; and a recording section that can digitally record the output information of the calculation section and record the output information of the ratio calculation section in analog form. Device.