JP3216790B2 - Alcohol concentration measurement device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates to A alcohol concentration measuring apparatus, and the alcohol concentration measurement apparatus using an alcohol sensor for use in measuring the alcohol concentration of the fermentation product, especially in the brewing process.

[0002]

2. Description of the Related Art Conventionally, in the brewing process of alcoholic beverages such as sake and wine, a part of a fermented product is taken out at an appropriate time and the alcohol concentration is measured. As a general method for measuring the alcohol concentration, a solid sample is removed by filtering a sampled fermentation product, a liquid sample is prepared, and the specific gravity of the liquid sample is determined using a float-type hydrometer. There is known a method of calculating an alcohol concentration by using the following formula.

However, according to this method, a large amount of a measurement sample is required, the amount of fermentation material to be sampled is large, and it takes a long time to prepare the sample. In order to solve this problem, the applicant impregnates a disposable sample-impregnated paper (filter paper) with a solution containing an alcohol which is a measurement sample, disposes the alcohol in an airtight chamber, and disperses the alcohol. Is heated to a predetermined temperature to promote the vaporization of alcohol, the concentration of alcohol filled in the chamber (vaporized alcohol concentration) is detected by, for example, a contact combustion type gas sensor or the like, and the original concentration is determined based on the obtained vaporized alcohol concentration. Has been proposed (for details, see Japanese Utility Model Laid-Open No. 7-12962).

[0004]

In the above-mentioned conventional alcohol concentration measuring apparatus, for example, the detection performance of the alcohol sensor deteriorates due to a change over time caused by solids contained in the moromi of sake which is the liquid to be measured. I was

Therefore, in order to continue accurate measurement,
Depending on the deterioration of the detection performance of the alcohol sensor, the signal processing circuit that processes the output signal of the alcohol sensor must be readjusted, or accurate adjustment cannot be continued simply by adjusting the signal processing circuit. in case of,
It is necessary to replace the alcohol sensor and readjust the signal processing circuit in accordance with the characteristics of the replaced alcohol sensor.

Since the readjustment of the signal processing circuit needs to be performed using various measuring instruments, the user of the alcohol concentration measuring device cannot easily perform the readjustment. For example, there is a problem that it is necessary to ask a maker, and it takes time, time and cost.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sensor unit and an alcohol concentration measuring device which can easily perform maintenance work, can be performed on site, and need not be adjusted.

[0008]

In order to solve the above-mentioned problems, an invention according to claim 1 includes an alcohol sensor whose resistance value changes in accordance with the concentration of vaporized alcohol in the surroundings,
A signal processing circuit that outputs a vaporized alcohol concentration detection signal having a voltage corresponding to a change in the resistance value of the alcohol sensor, and a sensor unit that integrally forms the alcohol sensor and the signal processing circuit ; Sensyu
Wear the detection part of at least the alcohol sensor of the knit
It has an insertion hole for detachable insertion,
The test target is measured by inserting the sensor unit.
Air in the closed space to vaporize the alcohol in the feed solution
It is provided with a chamber for forming an interval .

According to the first aspect of the present invention, the resistance of the alcohol sensor changes in accordance with the concentration of the vaporized alcohol in the surroundings, and the signal processing circuit has a voltage corresponding to the change in the resistance of the alcohol sensor. A vaporized alcohol concentration detection signal is output. The alcohol sensor and the signal processing circuit are integrally formed, and are inserted into the insertion hole of the chamber.
Is the detection of at least the alcohol sensor of the sensor unit.
The sample to be measured by the detachable insertion of the protrusion
Closed space for vaporizing alcohol in solution
Since forming the, by previously adjusting the advance signal processing circuit so as to replace integrally with the signal processing circuit when replacing the alcohol sensor, to adjust the work in the field
No need to replace sensor units easily on site
The operation can be easily shifted to the measurement operation .

[0010] According to a second aspect of the invention, A of claim 1
In the alcohol concentration measurement device , the signal processing circuit includes:
A basic bridge circuit that forms a bridge circuit by being connected to the alcohol sensor, a voltage detection unit that detects a change in the output voltage of the bridge circuit and outputs a voltage detection signal, and amplifies the voltage detection signal. Amplifying means for outputting as a vaporized alcohol concentration detection signal.

According to the second aspect of the present invention, in addition to the operation of the first aspect, the basic bridge circuit of the signal processing circuit forms a bridge circuit by connecting an alcohol sensor. Thus, the voltage detection means detects a change in the output voltage of the bridge circuit and outputs a voltage detection signal to the amplification means.

The amplification means amplifies the voltage detection signal and outputs it as a vaporized alcohol concentration detection signal. According to a third aspect of the present invention, there is provided an alcohol sensor whose resistance value changes according to the surrounding vaporized alcohol concentration, and signal processing for outputting vaporized alcohol concentration detection data having a value corresponding to the resistance value change of the alcohol sensor. A sensor unit having the alcohol sensor and the signal processing circuit integrally formed , and at least the sensor unit.
Also detachably insert the detection part of the alcohol sensor
For inserting the sensor unit into the insertion hole.
The alcohol in the sample solution to be measured is
To form a closed space for vaporizing
It is configured with a member.

According to the third aspect of the present invention, the alcohol sensor changes its resistance value in accordance with the concentration of vaporized alcohol in the surroundings, and the signal processing circuit has a value corresponding to the resistance value change of the alcohol sensor. Outputs vaporized alcohol concentration detection data. The alcohol sensor and the signal processing circuit are integrally formed, and are inserted into the insertion hole of the chamber.
Is the detection of at least the alcohol sensor of the sensor unit.
The sample to be measured by the detachable insertion of the protrusion
Closed space for vaporizing alcohol in solution
Since forming the, by previously adjusting the advance signal processing circuit so as to replace integrally with the signal processing circuit when replacing the alcohol sensor, to adjust the work in the field
No need to replace sensor units easily on site
The operation can be easily shifted to the measurement operation .

According to a fourth aspect of the present invention, in the third aspect of the present invention, the signal processing circuit includes a basic bridge circuit forming a bridge circuit by connecting the alcohol sensor, and a voltage change of the bridge circuit. Voltage detecting means for detecting a voltage detection signal and outputting a voltage detection signal; amplifying means for amplifying the voltage detection signal and outputting the amplified voltage detection signal as an amplified voltage detection signal; A / D conversion means for outputting as density detection data.

According to the invention described in claim 4, in addition to the effect of the invention described in claim 3, the basic bridge circuit of the signal processing circuit forms a bridge circuit by connecting an alcohol sensor. Thus, the voltage detection means detects a change in the output voltage of the bridge circuit and outputs a voltage detection signal to the amplification means.

The amplification means amplifies the voltage detection signal and outputs it to the A / D conversion means as a vaporized alcohol concentration detection signal. The A / D conversion means converts the analog /
Digital conversion is performed and output as vaporized alcohol concentration detection data.

[0017] According to a fifth aspect, a A alcohol concentration measuring apparatus according to claim 1 or claim 2, wherein, by performing analog / digital conversion of the vaporized alcohol concentration detection signal, as a vaporized alcohol concentration detection data A / D conversion means for outputting, and measurement means for measuring a solution alcohol concentration which is a concentration of alcohol in the sample solution based on the vaporized alcohol concentration detection data are provided.

According to the fifth aspect of the present invention, the A / D conversion means performs analog / digital conversion of the vaporized alcohol concentration detection signal output from the sensor unit.
It is output to the measuring means as vaporized alcohol concentration detection data. The measuring means measures the solution alcohol concentration, which is the concentration of alcohol in the sample solution, based on the vaporized alcohol concentration detection data.

[0019] According to a sixth aspect of the invention, a A alcohol concentration measuring apparatus according to claim 3 or claim 4 wherein the solution alcohol concentration is the concentration of alcohol in the sample solution on the basis of the vaporizing alcohol concentration detection data And a measuring means for measuring.

According to the sixth aspect of the present invention, the measuring means measures the solution alcohol concentration, which is the concentration of alcohol in the sample solution, based on the vaporized alcohol concentration detection data output from the sensor unit .

[0021]

[0022]

Preferred embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is an external perspective view of the alcohol concentration measuring apparatus when the chamber is airtight, and FIG. 2 is an external perspective view of the alcohol concentration measuring apparatus when the chamber is opened.

The alcohol concentration measuring device 10 is roughly divided into a chamber section 11 having a sample measuring chamber,
A display unit 12 for displaying various data, various data input,
It comprises a key switch unit 13 for performing operations and a printer unit 14 for printing out measurement results.

The chamber section 11 includes an upper lid 16 provided with a syringe inlet 15 for injecting a sample solution with a syringe, and a chamber 1 which is an airtight space formed by the upper lid 16.
7 are provided. On the lower surface of the upper lid 16,
Packing unit 1 for making chamber 17 airtight
8 and a sample holder 19 for holding a sample-impregnated paper (filter paper) impregnated with a solution containing alcohol as a sample.
And are provided. In this case, the sample-impregnated paper is not limited to the filter paper, but may be any other material that diffuses a sample solution containing alcohol and evaporates without adsorbing alcohol.

FIG. 3 shows a partial front sectional view of the alcohol concentration measuring apparatus. The sensor unit 2 is provided in the chamber 17.
6, a contact combustion type gas sensor 20 for detecting a vaporized alcohol concentration which is an alcohol concentration of vaporized alcohol (gas phase alcohol), a temperature sensor 21 for measuring a temperature in the chamber 17, and a chamber for measurement. 17
Stir the gas in the chamber
Fan 22 for exhausting gas in chamber 7 and chamber 1
And a heater 23 for heating the inside of the heater 7.

The sensor unit 2 is located adjacent to the chamber 17.
6, a sensor circuit main body 27 is provided. The sensor unit main body is provided with a detection circuit board 28 having a detection circuit 30 (30A) described later. In this case, the contact combustion type gas sensor 2 of the sensor unit 26
A part including zero (including at least the detection part of the contact combustion type gas sensor 20) is inserted into the insertion hole H of the chamber 17 with the airtightness of the chamber 17 secured, and the entire sensor unit 26 is fixed. I have.

Therefore, in the detection circuit 30 (30A), the current adjustment of the bridge circuit B described later, the zero balance adjustment, the offset adjustment of the voltage detection amplifier 41 described later, and the gain of the amplifier 42 described later are made corresponding to the contact combustion type gas sensor 20. By performing various adjustments such as adjustments in advance, on-site work only requires replacement of the sensor unit 26 and operation confirmation while the sensor unit 26 is mounted, thereby facilitating maintenance work. Can be.

FIG. 4 shows a schematic block diagram of a control system of the alcohol concentration measuring apparatus. 4, the same parts as those in FIG. 3 are denoted by the same reference numerals, and detailed description thereof will be omitted. The control system of the alcohol concentration measuring device is connected to the three output lines of the catalytic combustion type gas sensor 20,
A detection circuit 30 for outputting a vaporized alcohol concentration detection signal SAG corresponding to the vaporized alcohol concentration in the inside, a controller 31 for controlling the entire alcohol concentration measuring device functioning as a measuring means, and an output of the temperature sensor 21 under the control of the controller 31 A temperature controller 32 for controlling the heater 23 based on the signal to maintain the temperature in the chamber 17 at a predetermined temperature; a fan controller 33 for driving the fan 22 under the control of the controller 31;
Is provided with a buzzer 34 that outputs a warning sound when an abnormality is detected. Further, the display unit 12, the key switch unit 13, and the printer unit 14 are connected to the controller 31.

The controller 31 includes a nonvolatile memory 31a for storing various data, an RS-232C interface (IF) 31b for exchanging data with an external device, and an analog / digital conversion of the vaporized alcohol concentration detection signal SAG. And an A / D converter 31c for performing conversion and outputting the data as vaporized alcohol concentration detection data.

FIG. 5A is a schematic block diagram of the catalytic combustion type gas sensor 20 and the detection circuit 30. The contact combustion type gas sensor 20 includes a contact combustion type gas sensor main body 20a whose resistance value changes depending on the concentration of vaporized alcohol around the device.
And a temperature compensation resistor 20b connected in series with the contact combustion type gas sensor main body 20a and compensating for the temperature of the contact combustion type gas sensor main body 20a.

The detection circuit 30 includes a basic bridge circuit 40, which is connected to the catalytic combustion type gas sensor body 20a and the temperature compensation resistor 20b to form a bridge circuit B, and detects an output voltage of the bridge circuit B to generate a voltage detection signal SDV. A voltage detection amplifier 41 for outputting the voltage detection signal SDV, and an amplifier 4 for amplifying the voltage detection signal SDV and outputting it as a vaporized alcohol concentration detection signal SAG
2 and a constant current circuit 4 for supplying a constant current to the bridge circuit B
3 is provided.

The basic bridge circuit 40 includes a resistor 40a,
And a semi-fixed resistor 40b for zero level adjustment. The voltage detection amplifier 41 includes a variable resistor 41a for offset adjustment.

The amplifier 42 includes a variable resistor 4 for gain adjustment.
2a. The constant current circuit 43 includes a variable resistor 43a for adjusting a current amount. Here, the operation of the contact combustion type gas sensor 20, the detection circuit 30, and the controller 31 will be described.

The constant current circuit 43 supplies a constant current to the bridge circuit B. When a constant current is supplied to the bridge circuit B, the resistance value of the contact combustion type gas sensor main body 20a of the contact combustion type gas sensor 20 changes depending on the concentration of the vaporized alcohol around the contact combustion type gas sensor body 20a.

In parallel with this, the contact combustion type gas sensor 20
The resistance value of the temperature compensation resistor 20b changes in accordance with the ambient temperature, and performs temperature compensation of the catalytic combustion type gas sensor body 20a. As a result, the equilibrium state of the bridge circuit B is broken, and the output voltage of the bridge circuit B is detected by the voltage detection amplifier 41 of the detection circuit 30, and the voltage detection amplifier 41 outputs the voltage detection signal SDV to the amplifier 42.

The amplifier 42 amplifies the voltage detection signal SDV from the voltage detection amplifier 41 and outputs it as a vaporized alcohol concentration detection signal SAG. As a result, the A / D converter 31c of the controller 31 outputs the vaporized alcohol concentration detection signal SAG.
And outputs it as vaporized alcohol concentration detection data DAG. The controller 31 performs display on the display unit 12 and printout to the printer unit 14 based on the vaporized alcohol concentration detection data DAG. Become.

Next, the operation of the alcohol concentration measuring apparatus will be described with reference to the operation processing flowchart of FIG. When the power is turned on (step S1), the controller 31
The temperature controller 32 is controlled to start the initial warm-up (step S2).

Thus, the temperature controller 32 energizes the heater 23. Next, the controller 31 determines whether or not 20 minutes have elapsed from the start time of the initial warm-up (step S3), and enters a standby state until 20 minutes have elapsed. In this case, whether or not “20 minutes” has elapsed is determined because the temperature in the chamber 17 can almost reach the preset temperature (68 ° C. in the present embodiment) in about 20 minutes. is there.

If 20 minutes have elapsed from the start time of the initial warm-up (step S3; Yes), the controller 31
Determines whether the temperature in the chamber 17 has reached 68 ± 0.5 ° C. based on the temperature data from the temperature sensor 21 input via the temperature controller 32 (step S4), It is in a standby state until the temperature reaches 68 ± 0.5 ° C.

When the temperature in the chamber 17 reaches 68 ± 0.5 ° C. (Step S4; Yes), the display unit 12
A calendar (year, month, day, year) is displayed on the liquid crystal display (LCD) (step S5), and the process shifts to a mode switching process for switching operation modes (step S6).

The operation modes that can be switched include a calibration mode for calibrating data before concentration measurement, a measurement mode for actual concentration measurement, and a search for searching and displaying and printing out measured alcohol concentration data. Mode, a sake degree calculation mode for calculating and displaying and printing out the sake degree, a communication mode for transmitting data to an external information device (such as a personal computer) via an RS232C communication port, and a density not shown. And a range switching mode for switching a measurement range.

When the power is turned on and the alcohol concentration has not been measured yet, since the alcohol concentration data is not held, it is possible to shift only to the calibration mode or the range switching mode. . Further, even when the alcohol concentration measurement has already been performed, the transition to the measurement mode is possible only after the calibration mode ends.

There are two calibration modes, an automatic calibration mode and a manual calibration mode.
Based on the actual measured value and the input or the preset concentration of the calibration ethanol, a calibration process such as gain adjustment is performed so that the measurement result matches the actual alcohol concentration (step S7).

When the calibration is completed, the controller 31
Displays that fact on the display unit 12. At this time, when the operator presses a set key (not shown) of the key switch section 13, the controller 31 displays "Gain calibration completed" on the display section 12, and brings the upper cover 16 into a half-open state.

Then, the controller 31 displays on the display section 12 a message stating "Because the air is exhausted, the upper lid must be fully opened." This allows the operator to
When the controller 6 is fully opened, the controller 31 shifts the process to a re-preparation process, and performs an exhaust operation, a filter paper exchange operation, a re-warming operation, and the like (step S8).

Subsequently, the controller 31 sets the temperature in the chamber 17 to a predetermined temperature (68 ± 0.5 ° C. in the present embodiment) based on the temperature data from the temperature sensor 21 input via the temperature controller 32. It is determined whether or not the temperature has reached (step S9), and a standby state is established until the temperature in the chamber 17 reaches a predetermined temperature.

Next, the controller 31 determines the base voltage of the sensor based on the voltage value of the output signal of the contact combustion type gas sensor 20 input via the detection circuit 30 (step S10), and replaces the sample impregnated paper. Is not performed or the exhaust is insufficient, a message to that effect is displayed on the display unit 12 and a buzzer warns.

Thus, the controller 31 shifts the processing to the re-preparation processing, and performs an exhaust operation, a filter paper exchange operation, a warm-up operation, etc. (step S12). And the controller 31
Determines whether the measurement is completed (step S1).
3) In this case, since it is clear that the measurement has not been completed, the process returns to step S9, and the processes of steps S9 to S13 are repeated.

If it is determined in step S10 that the sample-impregnated paper has been exchanged and that it is determined that the exhaust is sufficient (step S10; Yes), the process proceeds to the measurement process (step S11). When the process shifts to the measurement process, a message is displayed by the controller 31 on the display unit 12 to close the upper lid 16 by the controller 31.

Thus, when the operator closes the upper lid, after a predetermined time (after about 10 seconds), the controller 31
Since "input of sample number" is displayed on the display unit 12, the operator inputs the sample number using the numeric keys of the key switch unit 13, and sets the set key of the key switch unit 13 to confirm the input sample number. push.

Thus, the controller 31 operates the display unit 1
Since the amount of the sample solution to be injected is displayed in 2, the operator collects the sample solution using the syringe 24 (see FIG. 4) and sets it in the syringe inlet 15. Then, the controller 31 is notified that the setting is completed by using a set key (not shown) of the key switch unit 13.

Next, the controller 31 displays “sample injection” on the display unit 12, and when the operator injects the specified amount of the sample solution, displays “measurement” on the display unit 12, and displays The remaining time until the end is displayed while counting down by the subtraction timer.

When the measurement is completed, the controller 31 makes the catalytic combustion type gas sensor 2 input through the detection circuit 30.
Based on the voltage value of the output signal of 0, the alcohol concentration (solution alcohol concentration) in the sample solution is displayed on the display unit 12, and the measurement result is printed out by the printer unit 14.

Further, since the controller 31 inquires through the display section 12 whether or not the measurement result has been confirmed, the operator confirms the measurement result and then checks the key switch section 13.
Press the set key. Thereby, the controller 31
While storing the measurement result in the nonvolatile memory 31a,
The upper lid 16 is set to the half-open state, and a display is displayed on the display unit 12 stating that "Because the air is exhausted, the upper lid should be fully opened."

When the operator puts the upper lid 16 in the fully opened state, the controller 31 proceeds to step S1.
The process shifts to the re-preparation process 2 to perform the exhaust operation. In parallel with the evacuation operation, the controller 31 displays the remaining time of the waiting time (10 seconds in FIG. 7) allowed by the operator for “during evacuation, changing the filter paper” and changing the sample-impregnated paper on the display unit 12. indicate.

Then, the operator replaces the sample-impregnated paper during the permitted standby time. Subsequently, when the time allowed for the replacement of the sample-impregnated paper elapses, the controller 31 displays on the display unit 12 a message “End of exhaust, close the top cover”. It is in a half-open state.

As a result, the controller 31 controls the temperature controller 32 and the fan controller 33 to
Let warm up for a minute. Then, in order to determine whether or not the measurement has been completed, the controller 31 displays a message “Do you want to continue the measurement” on the display unit 12 and prompts the operator to input an instruction.

Then, it is determined whether or not the measurement has been completed based on an instruction input by the operator (step S13). If an instruction has been input indicating that the measurement has not been completed (step S13; No), The process returns to step S9, and the processes in steps S9 to S13 are repeated.

If the measurement is completed in the determination in step S13 (step S13; Yes), the controller 31 displays "Do you want to continue the operation?" On the display unit 12 to determine whether or not the operation is completed. A message is displayed, prompting the operator to enter an instruction.

Then, it is determined whether or not the work has been completed based on the instruction input by the operator (step S14). If an instruction has been input to the effect that the work has been completed (step S14; Yes), the process is terminated. finish. If an instruction input indicating that the work is not completed is input in the determination of step S14 (step S14; No), the process returns to step S5, and the liquid crystal display (L
The calendar (year, month, day, year) is displayed on the CD) (step S5), and the process shifts to a mode switching process for switching the operation mode (step S6).

In this case, since the alcohol concentration has already been measured, the operation modes that can be switched include a calibration mode, a measurement mode, a search mode, a sake degree calculation mode, a communication mode, and a range switching mode (not shown). There is. Since the calibration mode, the measurement mode, and the range switching mode have been described above, the search mode, the sake degree calculation mode, and the communication mode will be briefly described. (A) Search Mode When the search mode is selected in the mode switching process (step S6), the controller 31 displays on the display unit 12 a prompt for input of the sample number to be searched. The sample number to be searched is input using the number keys 13 and the key switch unit 13
Is depressed by pressing the set key (step S1).
7).

As a result, the controller 31 reads the corresponding alcohol concentration data from the nonvolatile memory 31a and displays the measurement date, measurement time, sample number, alcohol concentration and measurement range on the display unit 12 (step S).
18). After the operator confirms the displayed contents, when the set key of the key switch section 13 is pressed, the displayed contents are printed out (step S19).

After printing out, the process proceeds to step S14.
Then, the same processing is performed. (B) Sake degree calculation mode In the mode switching process (step S6), when the sake degree calculation mode is selected, the controller 31 causes the display unit 12 to display various data necessary for the sake degree calculation (for example, measured with a refractometer. The operator is prompted to input “extract”, and the operator inputs various necessary data using the numeric keys of the key switch unit 13, and the key switch unit 1.
3 by pressing the set key (step S
20).

Thus, the controller 31 calculates the sake degree (step S21), displays the calculated sake degree data (step S22), and prints out the displayed data (step S23). After the printout, the process proceeds to step S14.
The same processing is performed. (C) Communication Mode When the communication mode is selected in the mode switching process (step S6), the controller 31 sets the RS232C
Various data such as measurement data can be transferred to an external information device (such as a personal computer) via the interface 32b.
And the fact is displayed on the liquid crystal display of the display unit 12.

After the transmission is completed, the process proceeds to step S14, and the same process is performed thereafter. As explained above,
According to the first embodiment, the sensor unit 26 is configured integrally with the contact combustion type gas sensor 20 which is an alcohol sensor and the detection circuit 30 which processes the output signal of the contact combustion type gas sensor 2, and the adjustment of the detection circuit 30 is performed. Since the operation is performed in advance, the operation can be performed on site.

Further, work on site is performed by the sensor unit 26.
The maintenance work can be facilitated simply by replacing and checking the operation. Second Embodiment In the above-described first embodiment, the detection circuit 30 includes an A / D
Without a converter, the vaporized alcohol concentration detection signal S
The A / D conversion of the AG is performed on the controller 31 side, but the second embodiment is an embodiment in which an A / D converter is provided in the detection circuit.

FIG. 7 is a schematic block diagram of a control system of the alcohol concentration measuring device. 7, the same parts as those in FIGS. 3 and 4 are denoted by the same reference numerals. The control system of the alcohol concentration measuring device is connected to three output lines of the catalytic combustion type gas sensor 20, and outputs a vaporized alcohol concentration detection signal SAG corresponding to the vaporized alcohol concentration in the chamber 17; 31A that controls the entire alcohol concentration measurement device that functions as a
And controlling the heater 23 based on the output signal of the temperature sensor 21 under the control of the controller 31A.
Temperature controller 3 for maintaining the temperature in 7 at a predetermined temperature
2. A fan controller 33 that drives the fan 22 under the control of the controller 31A, and a buzzer 34 that outputs a warning sound when the controller 31A detects an abnormality are provided. , A key switch unit 13 and a printer unit 14 are connected.

In this case, the contact combustion type gas sensor 20 and the detection circuit 30A constitute a sensor unit 26A corresponding to the sensor unit 26 in FIG. The controller 31A includes a nonvolatile memory 31a for storing various data, and an RS-232C interface unit (I / O) for exchanging data with an external device.
F) 31b.

FIG. 5 (b) is a schematic block diagram of the catalytic combustion type gas sensor 20 and the detection circuit 30A. FIG.
In FIG. 5B, the same parts as those in FIG. The detection circuit 30A includes a basic bridge circuit 40 that forms the bridge circuit B by connecting the contact combustion type gas sensor body 20a and the temperature compensation resistor 20b,
The output voltage of the bridge circuit B is detected and the voltage detection signal SDV
, An amplifier 42 that amplifies the voltage detection signal SDV and outputs it as a vaporized alcohol concentration detection signal SAG, a constant current circuit 43 that supplies a constant current to the bridge circuit B, and a vaporized alcohol concentration detection signal. An A / D converter 44 for converting SAG from analog to digital and outputting it as vaporized alcohol concentration detection data DAG1 is provided.

Here, the operation of the contact combustion type gas sensor 20, the detection circuit 30A and the controller 31A will be described. When a constant current is supplied to the bridge circuit B, the contact combustion type gas sensor body 2 of the contact combustion type gas sensor 20
In the case of 0a, the resistance value changes depending on the concentration of the vaporized alcohol in the surroundings.

In parallel with this, the contact combustion type gas sensor 20
The resistance value of the temperature compensation resistor 20b changes in accordance with the ambient temperature, and performs temperature compensation of the catalytic combustion type gas sensor body 20a. As a result, the equilibrium state of the bridge circuit B is broken, and the output voltage of the bridge circuit B is detected by the voltage detection amplifier 41 of the detection circuit 30, and the voltage detection amplifier 41 outputs the voltage detection signal SDV to the amplifier 42.

The amplifier 42 amplifies the voltage detection signal SDV from the voltage detection amplifier 41 and outputs it to the A / D converter 44 as a vaporized alcohol concentration detection signal SAG. The A / D converter 44 performs analog / digital conversion of the vaporized alcohol concentration detection signal SAG and converts the vaporized alcohol concentration detection data DAG.
It outputs to the controller 31A as AG1.

As a result, based on the vaporized alcohol concentration detection data DAG, the controller 31A performs display on the display section 12, printout to the printer section 14, and the like. As described above, according to the second embodiment, the contact combustion type gas sensor 20 which is an alcohol sensor is used.
The sensor unit 26A is configured integrally with the detection circuit 30A for processing the output signal of the contact combustion type gas sensor 2 and the detection circuit 30 is adjusted in advance, so that the work can be performed on site.

Further, work on site is performed by the sensor unit 26.
It is only necessary to replace A and check the operation, and maintenance work can be facilitated. Further, the detection circuit 30
Since A includes the A / D converter 44, the output from the detection circuit 30A is digital data, noise resistance is improved, and the degree of freedom in connection with the controller 31A is improved.

[0075]

According to the first aspect of the present invention, the alcohol sensor changes its resistance value in accordance with the concentration of vaporized alcohol in the surroundings, and the signal processing circuit generates a voltage corresponding to the change in the resistance value of the alcohol sensor. Is output.

[0,076] This alcohol sensor and the signal processing circuit are formed integrally, moreover, in the insertion hole of the chamber, Sen
At least the detection part of the alcohol sensor of the
Removably inserted into the sample solution to be measured
Creates a closed space for vaporizing alcohol
Since that, we are done by previously adjusting the advance signal processing circuit so as to replace integrally with the signal processing circuit when replacing the alcohol sensor, an adjustment in the field
Easy by simply replacing the sensor unit on site
Can be shifted to the measuring operation. Therefore, the work on site can be simplified, the time required for maintenance can be shortened, and the human cost can be reduced.

According to the second aspect of the present invention, in addition to the operation of the first aspect of the present invention, the basic bridge circuit of the signal processing circuit forms a bridge circuit by connecting an alcohol sensor, and detects the voltage. The means detects a change in the output voltage of the bridge circuit and outputs a voltage detection signal to the amplification means. The amplification means amplifies the voltage detection signal and outputs it as a vaporized alcohol concentration detection signal. Adjustment of the processing circuit can be performed in advance, and there is no need to perform adjustment work on site.

According to the third aspect of the present invention, the resistance of the alcohol sensor changes in accordance with the concentration of vaporized alcohol in the surroundings, and the signal processing circuit has a value corresponding to the change in the resistance of the alcohol sensor. Outputs vaporized alcohol concentration detection data. The alcohol sensor and the signal processing circuit are integrally formed, and are inserted into the insertion hole of the chamber.
Is the detection of at least the alcohol sensor of the sensor unit.
The sample to be measured by the detachable insertion of the protrusion
Closed space for vaporizing alcohol in solution
Since forming the, by previously adjusting the advance signal processing circuit so as to replace integrally with the signal processing circuit when replacing the alcohol sensor, to adjust the work in the field
No need to replace sensor units easily on site
The operation can be easily shifted to the measurement operation. Therefore, the work on site can be simplified, the time required for maintenance can be shortened, and the human cost can be reduced.

According to the fourth aspect of the present invention, in addition to the operation of the third aspect of the present invention, the basic bridge circuit of the signal processing circuit forms a bridge circuit by connecting an alcohol sensor, and detects the voltage. The means detects a change in the output voltage of the bridge circuit and outputs a voltage detection signal to the amplification means. The amplification means amplifies the voltage detection signal and outputs the amplified voltage detection signal to the A / D conversion means as a vaporized alcohol concentration detection signal. / D
The conversion means performs analog / digital conversion of the amplified voltage detection signal and outputs it as vaporized alcohol concentration detection data, so that the signal processing circuit can be adjusted in advance in accordance with the alcohol sensor, and adjustment work can be performed on site. No need to do. Further, since the output of the signal processing circuit is digital data, noise resistance is improved, and the degree of freedom in circuit arrangement is improved.

According to the fifth aspect of the present invention, the A / D conversion means performs analog / digital conversion of the vaporized alcohol concentration detection signal output from the sensor unit.
Output to the measuring means as vaporized alcohol concentration detection data, the measuring means measures the solution alcohol concentration which is the concentration of alcohol in the sample solution based on the vaporized alcohol concentration detection data, so that the alcohol concentration can be reliably measured. In addition, when replacing the alcohol sensor, adjusting the signal processing circuit in advance so that it can be integrated with the signal processing circuit eliminates the need for on-site adjustment work. The required time can be shortened, and the human cost can be reduced.

According to the sixth aspect of the present invention, the measuring means measures the solution alcohol concentration which is the concentration of alcohol in the sample solution based on the vaporized alcohol concentration detection data output from the sensor unit. When replacing the sensor, by adjusting the signal processing circuit in advance so that it can be replaced as a unit with the signal processing circuit,
The on-site adjustment work is not required, the on-site work can be simplified, the time required for maintenance can be reduced, and the human cost can be reduced. Further, since the output of the signal processing circuit is digital data, noise resistance is improved, and the degree of freedom in circuit arrangement is improved.

[0082]

[0083]

[Brief description of the drawings]

FIG. 1 is an external perspective view of an alcohol concentration measuring device (when an upper lid is closed).

FIG. 2 is an external perspective view of the alcohol concentration measuring device (when an upper lid is opened).

FIG. 3 is a front partial sectional view of the alcohol concentration measuring device.

FIG. 4 is a schematic configuration block diagram of a control system of the alcohol concentration measurement device according to the first embodiment.

5A is a schematic configuration block diagram of a detection circuit according to a first embodiment, and FIG. 5B is a schematic configuration block diagram of a detection circuit according to a second embodiment.

FIG. 6 is a main processing flowchart of the alcohol concentration measuring device.

FIG. 7 is a schematic configuration block diagram of a control system of the alcohol concentration measurement device according to the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Alcohol concentration measuring apparatus 11 Chamber part 12 Display part 13 Key switch part 14 Printer part 15 Syringe inlet 16 Top cover 17 Chamber 18 Packing part 19 Sample holding part 20 Contact combustion type gas sensor 21 Temperature sensor 22 Fan 23 Heater 24 Syringe 25 Sample impregnation Paper 26, 26A Sensor unit 27 Sensor unit main body 28 Detection circuit board 30, 30A Detection circuit 31, 31A Controller 31a Memory (non-volatile) 31b RS232C interface (I / F) 31c A / D converter 32 Temperature controller 33 Fan controller 34 Buzzer 40 Basic bridge circuit 41 Voltage detection amplifier 42 Amplifier 43 Constant current circuit 44 A / D converter

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01N 27/00-27/49

Claims (6)

(57) [Claims] An alcohol sensor whose resistance value varies according to claim 1 Corresponding to vaporize the alcohol concentration of the ambient, pre SL and a signal processing circuit for outputting a vaporized alcohol concentration detection signal having a voltage corresponding to the resistance value change of the alcohol sensor , With
And a sensor unit forming the previous SL alcohol sensor and the signal processing circuit together, at least the alcohol sensor of the sensor unit
It has an insertion hole for detachably inserting the detection part of
By inserting the sensor unit into the insertion hole,
For vaporizing alcohol in the sample solution to be measured
An alcohol concentration measuring device comprising a chamber forming a closed space . 2. The alcohol concentration measuring device according to claim 1, wherein the signal processing circuit is a basic bridge circuit that forms a bridge circuit by connecting the alcohol sensor, and an output of the bridge circuit. An alcohol concentration measurement device , comprising: voltage detection means for detecting a voltage change and outputting a voltage detection signal; and amplification means for amplifying the voltage detection signal and outputting the same as the vaporized alcohol concentration detection signal. . And alcohol sensor whose resistance value varies 3. Corresponding to vaporize the alcohol concentration of the ambient, pre SL and a signal processing circuit for outputting a vaporized alcohol concentration detection data having a value corresponding to the resistance value change of the alcohol sensor has, before Symbol a sensor unit and formed integrally with the alcohol sensor and the signal processing circuit, at least said alcohol sensor of the sensor unit
It has an insertion hole for detachably inserting the detection part of
By inserting the sensor unit into the insertion hole,
For vaporizing alcohol in the sample solution to be measured
An alcohol concentration measuring device comprising a chamber forming a closed space . 4. A alcohol concentration measuring device according to claim 3, wherein <br/>, pre SL signal processing circuit, the basic bridge circuit constituting the bridge circuit by the alcohol sensor is connected, the bridge circuit Voltage detecting means for detecting a voltage change and outputting a voltage detection signal; amplifying means for amplifying the voltage detection signal and outputting the amplified voltage detection signal as an amplified voltage detection signal; A / D conversion means for outputting as vaporized alcohol concentration detection data; and an alcohol concentration measuring device . 5. A A Ruko <br/> Le concentration measuring apparatus according to claim 1 or claim 2, wherein, by performing analog / digital conversion of the vaporized alcohol concentration detection signal, output as the vaporized alcohol concentration detection data A / D conversion means for measuring the alcohol concentration in the sample solution based on the vaporized alcohol concentration detection data, and an A / D conversion means for measuring the alcohol concentration in the sample solution. 6. An alcohol according to claim 3 or claim 4.
Le A concentration measuring apparatus, the vaporizing alcohol concentration detection data alcohol concentration measuring apparatus characterized by comprising measuring means for measuring the solution alcohol concentration is the concentration of alcohol in the sample solution based on.