JPS5932833A - Device for detecting time when temperature lies in specific region - Google Patents

Abstract

PURPOSE:To monitor the temperature including time element readily and adequately, by providing a means which detects a temperature when it lies in a specific region, a means which computes the time based on the detected and counted signal value and the detected time interval, and a display means. CONSTITUTION:The reference values on the upper and lower limit sides are preset by variable resistors 46, 46' and the like. A pulse signal is generated by a pulse generating circuit 48 or 48' when a temperature exceeds the upper limit side reference value or becomes lower than the lower limit side reference value. Said detecting operation is performed at every specified time interval, by controlling the current conduction by a timer 7. A time computing part 8 has pulse counters 81 and 81' and operating circuits 82 and 82'. The pulses from the pulse generating circuits 48 and 48' are computed by the pulse counters 81 and 81'. The time corresponding to the detection time interval is computed by the operating circuits 82 and 82' for only the number of pulse generation.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for detecting the time when the temperature is in a specific range.

For quality control when storing items that are affected by temperature, such as chemicals, for a certain period of time, and for inspecting the frozen state of frozen foods at locations where they are transported, it is important to ensure that the temperature remains within the appropriate range throughout the period of storage and transportation. You will be asked to look at it to see if it is there. Conventionally, the temperature in such cases has simply been checked using a temperature detector. However,
For example, in quality control during the storage period, the effect on quality is significantly different depending on whether the time the temperature is within the appropriate range is short or the time when the temperature is within the appropriate range. It is an important element in quality control.−
Still, when inspecting frozen foods during transportation, the temperature is generally inspected before and after transportation, but in this case, the temperature is only checked after 011 of transportation. Even if a single food item is exposed to an inappropriate temperature for a long period of time, it cannot be checked. It is extremely difficult to carry out such instructions and actions appropriately if only a temperature sensor is used.
．． Met.

In view of these 1-1 considerations, the present invention is capable of detecting and displaying 17) when the temperature is in a specific range, thereby improving the quality of the chemicals, etc. (11: during 7M). We provide a device that allows you to easily and appropriately monitor temperatures, including time factors, in food processing or temperature inspection of frozen foods.

That is, the device of the present invention includes a temperature sensor and a constant n<,
a detecting means for detecting when the temperature is in a specific range by comparing the output from the temperature sensor with a reference value every other time; The device is equipped with a time integrating means for integrating 11 times corresponding to the moxibustion onset time interval and a display means for displaying the integrated time.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram schematically showing the device of the present invention-C;
In the figure, a temperature sensor 1 has a temperature sensing section 2 and a signal converting section 3 that converts the temperature sensed by the temperature sensing section 2 into an electrical signal. 4 is a detection means for determining whether the temperature is in a specific region J or not at regular intervals, and 1. ! I1. Standard value set value setting section 5
The output from the degree sensor 1 is 71f/value setting section 5.
Temperature comparison section 6 that sets the base value and ratio I
and a timer 7 that causes the temperature comparator 6 to operate 1IiJ+ at regular intervals.

The above basic value ((directly, in the setting section 5 (d pre-use I) 1, t) is set to an appropriate basic value (1h), and the temperature ratio 1
To the bite part 6: 1. - If the temperature sensor "j -
1, the output from the conversion unit 3 is expressed as
1' is used to determine whether or not ta has been exceeded. In this case, by comparing the output of the above (1) Australia J converter 3 with one reference value, when the temperature exceeds a predetermined value,
: When i is below the predetermined value, the detected number a is 1 as well.
・It is also possible to make it possible to
i: As shown, by setting two bases on the second limit side and the lower limit side, a detection signal can be obtained when the output from the signal converter 3 exceeds a predetermined range. You can also do it like this. What temperature range is detected in fi7:
', '3 may be generated or the C dimension may be determined in advance depending on the usage.

8 is a reconnaissance section (time accumulating means) which receives the detection signal from the temperature comparator section 6, counts the number of detections mentioned above, and sets the timer 7 based on the counted value and the timer 7 in 1jO. The time period during which the temperature is in the .1ζ5 constant region is calculated based on the detection time interval.

Further, 9 is a display section (display means), and a time product p section 8
The system receives signals from the computer and displays the accumulated time.

FIG. 2 shows an example of the circuit of this device, and in the same figure,
The temperature sensor 1 uses a heat-sensitive resistor 20 such as a platinum resistor to form a temperature sensing portion, and the heat-sensitive resistor 20
and fixed resistor 3 ], , 32, ijJ' resistor 3
A signal converting section is formed by a bridge circuit 30 in which a power source 34 is connected between two points facing each other with 3 arranged on four sides.

The detection means 4 also detects when the temperature is above the high temperature reference value and when it is below the low temperature reference value, respectively. ．．
1, 41' (G), and the output terminal of the bridge circuit 30 is connected to the respective input terminals of the amplifiers 41 and 41', respectively.
are connected via. The connection direction of the diodes 4.2 and 4.8 to the amplifier 41 for comparison on the high temperature side and the diodes 42' and 4.8 to the amplifier 41' for comparison on the low temperature side.
1.3' cough continuation direction is opposite. Each amplification HB
Diode 4 is installed on the output side of 41 and 4.1', respectively.
4. , 44. ', resistors 45, 45', variable resistors 46, 46', and power supplies 47, 4.7' are connected as shown in the figure, and the resistor 45 is
, 45' are connected to the pulse generating circuits 48, 48.
' is being entered. Therefore, the variable resistor 46,
By setting the reference values on the upper limit side and the lower limit side in advance by using 48', and a timer (not shown) is used to restrict energization to these circuits, so that such a detection operation is performed at regular intervals. .

Further, the time integration unit 8 includes a pulse counter 81. ．． 81'
and arithmetic circuits 82 and 82', and a pulse generation circuit 4s with two pulse counters 81 and 81'.

The pulses from 48' are counted and the calculation circuits 82, 82'
Therefore, the detection time interval is equal to the number of pulse generation [ri1ζ4 to 4
It is configured so that the time when 111 hits is accumulated.

Connect the display unit 9 to the output ff111 of the time integration unit 8;
, are doing. The display section 9 displays, for example, as shown in FIG. 3, the upper limit temperature side Jit fi! - A value display section 91, a display section 92 for one period when the temperature is higher than this reference value, and a lower temperature limit side value display section 93 and this reference value display section 93,
It has a display section 94 for displaying the time when the humidity is below the - value, and is formed using a photoelectric display device.

The first detection means 4 and the time integration section 8 can be constructed using a microcomputer, and a flowchart in this case is shown in FIG. To explain this flowchart, after the start A, first, the set value reading B of the upper limit temperature rU and lower limit temperature TL is fj, and then the timer is started and the time tu exceeding the upper limit temperature is read out.
Setting C where both the time tL below the lower limit temperature are 0.
will be held.

Subsequently, temperature detection (reading of Ii T) output from the temperature sensor 1 is performed, and this temperature detection value T
Judgments E and F are made as to whether or not is (T〉'rU) and whether or not it is (T x TL). When (T>TU), the time tu over the upper limit temperature is (1u=1.0ΔL
) and the display G is performed, and still (T <
TL), the time t1 below the lower limit temperature is (tL=
tL + Δt) and display 1 (are performed,
Following these, the front crosspiece (2) is performed for a certain period of time Δt. On the other hand, when the 71□IY degree detection axis 'r is included in the range between the upper limit temperature Tu and the lower limit temperature TL, the musical composition determinations E and FK are then directly followed by a standby period Δt for a certain period of time Δt.

Further, after this wait I, a flow from reading D of the temperature detection value T is carried out.

Note that in this flowchart, Δt means a detection time interval set by a timer.

In a device configured in this way, - a certain period of time Δt
For example, when the temperature detection value T changes every other time as shown by the X mark in the graph of FIG. , the time display section 92 on the high temperature side in the tlfJ display section 9
A constant time gate Δt is displayed. Further, each time the detected temperature value T becomes less than the upper limit value TU, a fixed time Δt is added and the time display is changed. Therefore, the operation start point t□
If the temperature detection value T exceeds the upper limit value TU three times by the time point tn- consisting of
is displayed. The same applies to temperature detection (when direct T is below the lower limit value TL).

In this way, the cumulative total of the time when the actual temperature is above the upper limit value TU and the time when the actual temperature is below the lower limit value TL is approximately %.
appear and be displayed. In this case, if the detection time interval is made sufficiently small for the continuous production 1fiI-+light, a highly accurate approximation can be obtained, which can be used for quality control when, for example, chemicals are stored for several months. Sufficient accuracy can be obtained even if the detection is performed at intervals of about one hour.

In the specific example, the time when the temperature exceeds the upper limit and the time when the temperature falls below the value for the youngest child are detected. In the case of detecting the time when , the detection means and display for the time less than or equal to the lower limit value may be omitted in the circuit of FIG. 2 or the flowchart of FIG. 4. In addition, in the embodiment, the time when the temperature is outside the appropriate range is displayed, but for example, by adding a display section for the time when the temperature is within the appropriate range to the display section shown in FIG. It is also possible to integrate and display both the time and the time within the appropriate range, or - also, if the temperature is the upper or lower base t1 (
It is also possible to integrate and display the values within a predetermined range of values.

As described above, the device of the present invention has means for comparing the temperature with a reference value at regular intervals and detecting when the temperature is in a specific range, and based on the detection signal count value and the detection time interval. The means for integrating time and the display means are designed to approximately cumulatively display rυ· when the temperature is in a specific range. For this reason, the temperature is specific! This can be effectively used in applications such as quality control and inspection of frozen foods, where knowing a certain time is critical.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an embodiment of the device of the present invention, Fig. 2 is a circuit diagram showing a specific example, Fig. 3 is a schematic diagram showing an example of a display stage, and the chopstick 4 figure is a flow chart "i' - l-1 Fig. 1 is a graph showing the relationship between temperature change and integrated time opening. 1... 11M1 degree scissor, 4... Means for detecting that the temperature is at a specific head level. , 8... Tokikai Bonds, 9...
Display section. Width,,'r Applicant Sakura Crepas Co., Ltd. Agent Patent Attorney Etsushi Kotani. -Go~'' Figure 4 514-17;

Claims (1)

[Claims] 1.l! Compare the output from the temperature sensor with the reference value at regular intervals to determine the temperature: f
i, 145, detecting means for detecting this when it is present;
While counting the moxibustion output from the detection means, the detection means (, -
7. A time counting unit that integrates the number of times corresponding to the number if and a display means that displays the integrated time.
i! iii. A device for detecting the time when the temperature is in a specific region.