JPS5862565A - Control of liquid temperature - Google Patents

Abstract

PURPOSE:To maintain desired temperature quickly even against any sharp change in the temperature by controlling the energization of a heater with the output of an integral control circuit following a proportional control circuit and a differentiation control circuit to which outputs are fed from a sensor for detecting the temperature of a liquid. CONSTITUTION:Outputs of an auxiliary temperature sensor 22 mounted on a thermostat frame are fed to a Peltier element controlling circuit 31 and according to outputs thereof, the output voltage of a power source 32 connected to the Peltier element 15 is controlled so that the frame 13 always attains a specified temperature 6. A temperature sensor 20 provided on the frame 13 is connected to one side of a d.c. bridge 33 to feed output signals thereof to a proportional control circuit 34, which controls the heating level from a heater 18 in proportion to a deviation between the set temperature and a flow cell temperature. Output signals are fed to a differentiation circuit 35 from the circuit 34, which controls the heating level by the heater 18 according to the rate of any sharp change in the flow cell temperature. The outputs of the circuit 35 is also fed to an integral control circuit 36 to remove the offset. The output thereof is fed to a heater driving circuit 37.

Description

DETAILED DESCRIPTION OF THE INVENTION In an analyzer that performs chemical analysis of a large number of specimens, such as blood samples, temperature i is required to maintain the specimen at a desired set temperature in order to accurately react the specimen or perform colorimetric measurements. This relates to a control method.

For example, when using the 70-cell v3 in colorimetric measurements, the samples that have completed the reaction are transferred one after another from the reaction g'a to the 70-cell, and each sample is kept in the 70-cell for at least one second. Colorimetric measurements are being carried out.

In this way, the 70-cell is filled with at least one sample force that fills the flow cell. It is necessary to maintain the desired wetness for a desired period of time.The processing efficiency of recent chemical analyzers is such that they are able to process an extremely large number of pAI4=in 1 #h1.Therefore, 70 -Do not heat or cool the sample more than once in the cell in a short period of time.
Must be L. Roughly, as a part of the latest chemical analysis Kabura,
Use +! It is intended to reduce the number of I1 reagents as much as possible, and therefore the 70-cell is also small, so the sample retardation device in the 70-cell is also small, and the entire analyzer is also small. There is a need to be able to make it smaller.

Conventionally, known methods for controlling the test solution in the 70-cell include one that uses cypress, and one that uses heat and quenching methods directly into the 70-cell. . In the case of using a heat medium such as water or ethylene glycol, a container is housed in this shell, and the heat medium is heated to 111+AIL, so that it is possible to hide the crystals of the toilet. Setting 1: I am trying to hold 4 at a time. However, in this case, one row of four flow cells is required for each heat transfer medium, and there is a drawback that the entire device becomes extremely large. In addition, a large device is required to control the temperature of such a large volume of heat medium, and since the heat capacity and weight of the constant temperature liquid bath is very large (Vl), when changing the set temperature, Another disadvantage is that it takes a very long time to reach temperature. This means that if there is a temperature fluctuation, it will take a long time to reach an equilibrium state and the response characteristics will be poor.
Therefore, control accuracy also deteriorates. In order to eliminate such defects, 70-cell l as shown in Figures 1 and B is used.
A pair of thermo module cores a and Jb made of, for example, Peltier elements are attached to the opposing upper and lower surfaces or side surfaces of the module, and a pair of temperature sensors JeL are attached to a surface orthogonal to these surfaces.
, Jb has been proposed. The test liquid is introduced into this 70-cell l via the introduction f4', and the temperature sensor J
The output of thermo module-a, 31)
While the test liquid is maintained at a predetermined level by heating or cooling the lens 5, the light from the lens 5 passes through the collimator lens 6, passes through the lens 70, and enters the receiving lens 7. After the 21I determination, the sample is discharged to the outside of the flow cell through the discharge fl. thermo module λ
When a and zb are configured with Peltier buttons, JJII's 4 pressure is 4! I [! Cooling or JIJ IA can be performed selectively by changing the notes, but for this purpose, it is necessary to have positive and negative shelf properties, and the disadvantage of poor l crystal antistability. There is. Furthermore, the thermal response is poor and it is difficult to perform highly accurate control.

Roughly follow the time sequence to collect 70 samples sequentially.
If the step of introducing the molten metal into the cell is repeated several tens of times, the heat weight increases, and the difference between the temperature once inside the 70-cell and the set temperature gradually increases, resulting in an offset.

In this way, once introduced sequentially into the 70-cell is considered to be one set of sufficient time, and these 4 coarses are set as the predetermined J411--
Attaching it is a bo to Izutsu, and a boa of birth +t1
For example, if we consider a valley sample, two disturbances occur within a short period of time, and the environmental temperature drops to
For example, under adverse conditions where the temperature fluctuates in the range of 0 to JC and the power supply fluctuates by 70%, for example, the set temperature is maintained within the range of J7° ± 0.2° for 10 seconds. It is necessary to meet extremely strict requirements, and the entire device needs to be small and inexpensive.

Furthermore, in the temperature submethod in conventional analyzers, 1
Proportional control was used to detect the temperature, compare this temperature with the set temperature, and control the heating source according to the difference. However, as mentioned above, in a 70-cell or the like where the temperature fluctuates rapidly, it is not possible to maintain the sample temperature at a desired temperature quickly and precisely by such proportional control alone.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for controlling the temperature of a liquid that can eliminate the above-mentioned conventional drawbacks and also satisfy the various conditions mentioned above.

The present invention allows liquid to be intermittently supplied to and discharged from a container of wood.
The temperature of the liquid contained in the container is determined in order to maintain it at the desired set temperature for the desired period of time while the liquid is contained in the container. The output of the 1M good sensor that can be used directly or in the same way (4) is supplied to the control circuit that performs proportional control - 1 compensation - and I - control. The output of this control circuit controls the heating source. It is characterized by the following.

In a preferred embodiment of the invention, the heating basin is provided with a cooling heat source, and both are used to bring the liquid in each 4 to the desired set temperature at micro speeds and with precision.

The present invention will now be described in detail with reference to page 4.

214 is an Ivr plane view showing the configuration of an example of the valley H in which the temperature control method of the present invention is practiced. A pair of conductors - Ml /
1111M frame 13 that forms a black sink for the 7U cell 12 to which the test solution is supplied and discharged through / (only force is applied)
Surround with 70-7 l/l constitutes the main body of valley a. The bottom of this aiming frame 13/3 A has a dent for protection/4
1, and here you get 1 with a low heat tax rate of 4 or 7
cl-. In this example, the air is illuminated 14.

Aim-frame month w 315/J A cooling heat source on the F side::
,, rearrange the Hernae element /j that acts as a bell, and connect it to the high tM-〇yu heat sink 16 of this bell and Che 44 element.

This heat sink 16 also serves as a support for the entire container, and the constant temperature frame 1
3 is fixed to the heat sink 16 with screws 12. This screw/
7 is made of a thermally insulating material, such as Delrin. The side wall/3f3 of the 111i heating frame/3 forms a space together with the bottom/3A, and within this space there is a heater/I that acts as a JJIJ heating section.
is placed, and a 70-cell lλ is inserted inside this heater. 70-A heat transfer plate/9 and a flat temperature sensor are inserted between the V between the cell 12 and the heater/l. Further, the upper opening of the constant temperature frame 13 is closed by the armor l. Additionally, an auxiliary temperature sensor n is attached to the outer surface of the constant temperature frame/3.

As described above, since the Peltier element B is in contact with the bottom fH/3k of the constant temperature frame 13, there is a delay in heat conduction between the top and bottom of the constant temperature frame, and a temperature difference is likely to occur.

Therefore, in an unusual case, a recess/- is formed in the extension part/J, and heat resistance is provided by applying a light seed of low conductivity to this, thereby controlling the flow of cooling heat. /3
We are trying to equalize the overall temperature. In addition, the heat capacity of 111 l is large, and this 1 m is designed to act as an auxiliary cooling heat source. In this way, the constant temperature frame 13 and @2/ surrounding the 70-cell 12 are cooled almost uniformly by the Peltier element 15, but the +M resistance of these parts is lower than the desired setting, for example, J7'C. The supply to the Peltier filter /j is controlled by the reconnaissance output of the auxiliary humidity sensor n so that 1iIAtc is maintained at a sufficiently low level.

/i! The traction sensor detects the preparation of the liquid contained in the flow cell lλ, and this tM degree can be accurately measured by inserting the sensor into the trowel, but it is difficult to measure the contamination between the liquids. When we consider the nation and 1-person nature, the power that is not placed within the 70-cell becomes apparent. However, if it is placed outside the flow cell, the question becomes how to accurately detect m 1K of the liquid inside the cell. Therefore, in this example, a sensor is placed immediately outside the 70-cell lλ, and a heat delay +R/9, which constitutes an IA resistance member, is placed between the sensor and the heater/g. By setting the thermal time constant determined by the hot air sushi and #I/% tani of this W & delay plate/9 to be approximately equal to the thermal time constant of 70-cell/2, the By anti-senri J, it is possible to accurately recognize 1M1 anti in 70-cell. Furthermore, by changing the characteristics of this heat delay &/9, the operating characteristics of the handling system can be changed as will be described later.

Furthermore, the temperature sensor is constructed by toe-emulating a foil of a carefully selected pure metal (N1°pt, etc.) and then binding it with epoxy or the like. The resistance value of such a foil temperature sensor is several hundred nines, and since the thermal resistance and heat g- are small, the response is extremely continuous. Further, the heater 11 is constituted by a wire-wound heater in which a resistor is wound around an insulating plate. In this example, the heat delay plate 19 takes in the heat flow from the Hengshu frame 13 or the heater/I, and the heat flow is 1! The time delay until the heat Ei is transmitted to the temperature sensor is longer than the time delay until the same heat flow is transmitted to the 70-cell 12 containing the sample.
The time constant is fixed. That is, when the heat delay plate 19 is heated i
The thermal time constant of the low cell Iλ is set to be slightly larger than the thermal time constant of the low cell Iλ. The heat delay plate 19 is made of a heat-resistant material, such as glass epoxy resin, and has a transfer time constant determined by the combination of 70-degree heat filter and thermal resistance as described above. By appropriately selecting the material and thickness of the heat-through plate, the size of the valley can be reduced.

In the liquid container of this example, as described above, 70-cell 1
2 is surrounded by a heater, the heater is roughly surrounded by a constant temperature frame 13, the Peltier element cooling heat source /1 is brought into contact with this constant temperature frame 13, and the constant temperature frame /3 is heated to a desired set temperature, for example, a temperature lower than n°C. For example, the temperature is constantly maintained at 3°C, that is, the cooling heat source /J acts as a single thermal bias that biases the temperature of the liquid in the flow cell toward the low temperature side. By comparing the detected temperature with the set temperature and controlling the energization to the heater 71 according to the difference, the liquid in the flow cell can be quickly and accurately maintained at the desired set temperature. , control characteristics can be significantly improved by cooling and heating at the same time. Figure 3 shows the thermal equivalent times of the entire container shown in Figure 1. The correspondence with the parts is as follows.

RK work, RK2...Thermal resistance of constant temperature frame 13 is OK
...Heat capacity 1 of constant temperature frame 13 (, engineering, RH
2...Thermal resistance V of heater I...Φ・
Heat generation of heater I -1<oe ...Thermal resistance Go of heat retardation plate/9 ...Heat capacity R10 of heat retardation plate 19, ...Thermal resistance CJ of wall of flow cell-12 ! , ...70-Kumagai edge Rx of the wall of the cell 12 ....Thermal resistance of the liquid 1,.

-4 @ , @ * @ Heat capacity of liquid -I, ... Cooling heat flow + work by fist Peltier element / j ~ +1 ... ... by heater l /
Jll Heat Heat Flow H1, H4 5W... Points a - e of the exclusive circuit are the points a - e shown in Figure 1.
Each corresponds to e. Also, in this thermal equivalent circuit, G
, the thermal resistance and heat capacity M of the 14 degree sensor are one smaller, so they can be ignored. This temperature sensor is fixed at point C. When comparing the left side and the right side of point C, there are 70 cells and liquid on the right side, so the thermal resistance and heat capacity of these flow cells and liquid are equal to Q'6kA. The heat delay plate 19 having the heater/I
By inserting the temperature sensor between the cell 70 and the temperature sensor, the temperature sensor is equivalently located approximately at the center of the entire system, and therefore the temperature of the liquid in the cell 70 can be accurately detected. 〇 Fig. 4 shows that after the liquid maintained at a predetermined temperature in the 70-cell 12 is discharged, the next liquid flows through the conduit l/ to the 70-cell.
70 is a graph showing the temperature at point e in the cell when supplied into the cell and the temperature change at point C detected by a temperature sensor. 70-When the liquid in the cell 12 is at the predetermined set temperature, point e and point 0 are at approximately the same desired temperature. Instant T.

70 - Start draining the liquid in the cell and at point e
temperature drops rapidly. -The temperature at power point C changes relatively slowly. When this temperature drop at point C is detected, the control circuit operates, supplies current to heater/I, and raises the temperature. Therefore, the temperature at point e in the 70-cell starts to rise from the instantaneous T operation. On the other hand, since there is a heat delay plate 19 between the heater/l and the temperature sensor, the temperature rise at point C will be delayed until the instantaneous peak, and the temperature at point C will rise from 1. Become. At H time T3, new liquid is supplied, but since the 1M1N of Kasuri-nata liquid is generally lower than the set temperature, the temperature at point e sharply decreases again.

This liquid supply continues until instant T4. During this time, current continues to be supplied to the heater /S, and after a sufficient period of time, the temperatures at points e and C are set at the current setting QJI r/
This cycle is repeated for successive liquids, and the successive liquids are quickly and steadily maintained at a predetermined set temperature. In Fig. 4, the atmosphere is 1M.
The opposite is J”C.

In this example, the thermal time constant of the heat delay plate/9 is set to be slightly stronger than that of the flow plate 12 as described above in the GJ, but with this configuration, the following effects can be obtained. clause. Figure S points, dA tlj at c and e, respectively.
This shows the state of overshoot. Assuming that the set temperature is T#3, the heater/g is energized and the temperature rises. 9, the temperature at point 0 near heater 7g rises most rapidly by l- as shown in curve b'''C''
The temperature at point C, indicated by jC, is more gradual, but rises more rapidly than the temperature at point e, indicated by curve e. instant ts
When the temperature at point C reaches the set temperature, the temperature at point e has significantly overshot, but the temperature at point e has not yet reached the set temperature. When the temperature at point C exceeds Ts, the power supply to heater/l is cut off or reduced, and the temperature begins to drop. Therefore, the temperature at point e is within the tolerance range ±ΔT8 centered on the set temperature Ts at the instant t.
The lower limit of 0 is reached, and it rises more slowly but does not exceed the upper limit of the tolerance range. In this way, 70
- It is possible to suppress the overshoot of the temperature of the liquid in cell/2 within the permissible error range, and it is possible to accurately heat the liquid to the desired set temperature within a short time.

Further, the thermal time constant of the thermal slow fL1 plate 19 can be made smaller than that of the 70-cell 12, and the operating characteristics in this case are shown in FIG. In this case, the rate of temperature increase at point e will be higher than at point 0, and the temperature at point e in the 70-cell will rise quickly and reach the set temperature TB at the instant ti. In this way the temperature of the liquid can be quickly adjusted to the desired temperature and °.
I can do it. After that, when rll+&W at point C reaches the set temperature T8 at instant t8, the force applied to heater/g is reduced and the temperature at point e starts to drop, or by appropriately setting instants th and ts, By configuring each part so that the temperature at point e is within the allowable error range Ts±ΔTs, it is possible to eliminate the influence of overshoot and improve the rise characteristics.

FIG. 7 is an exploded view showing the configuration of an example of a loop control circuit for implementing the temperature control method of the present invention, which receives the output of the temperature sensor and controls the power supply to the heater/g.

Auxiliary temperature sensor n attached to constant temperature frame 13 in No. 11
1'i force is applied to the Peltier element control circuit 3/, and its output controls the output pressure of the tube #32 connected to the Peltier cord/j, so that the 111 temperature frame/3 always maintains the predetermined humidity. I will make it happen. In this example, since the Peltier element IS is used only as a cooling heat source, the source 11 32 may be a unipolar DC power source. Temperature sensor installed in t1i warm frame/3 tm ME
, connected to one side of the bridge 33, and the output 1 of this bridge
d is supplied to the proportional control circuit j4I. This proportional control circuit 3# controls the amount of heating from the heater/l in proportion to the deviation between the set temperature and the 70-cell temperature. The output signal of this proportional control circuit 34I is supplied to the differential control circuit 3j. This differential control circuit does not work when the temperature of the flow cell does not change, but when liquid is supplied to and discharged from the Ally cell 12 and the temperature of the flow cell changes rapidly, the heater is activated depending on the speed of the change. /I controls the amount of heating. The output of this differential control circuit 3S is further supplied to an integral control circuit 3≦. This integral control circuit is
This is to center the offset, which is a steady deviation between the set temperature and the temperature of the 70-cell. In the present invention, the output that has passed through the proportional control circuit 3, the differential control circuit 3s, and the integral control circuit 3≦ is thus supplied to the heater drive circuit 1. The heater drive circuit n of this example includes a sawtooth wave generator 31, a differential amplifier 1 that calculates the difference between the output of the sawtooth wave generator 31 and the output of the integral control circuit 34, and a pulse generator circuit that creates switching pulses using this differential output. A switch such as an SOR whose conduction and cutoff are controlled by this switching pulse is used. This switch 41/ is one S
CR is a bidirectional switch connected in antiparallel and connected between commercial power supply yi and heater /l.

The operation of the heater drive circuit n of this example will be explained with reference to FIGS. Figure A shows the control circuit 1. ″136
The output control pressure e and the sawtooth wave voltage S from the sawtooth wave generator 3J' are shown. The two city pressures are compared using differential amplification, and from the switching pulse generation gain, Figure 1B
As shown in □, a switching pulse having a pulse width equal to the level difference between the two city pressures by one center is generated. During the duration of this switching pulse, the switch 41/ is conductive, and leakage is caused to the heater/l only during that period. The liquid in the 7 μm cell can be maintained at a predetermined value by controlling the energization to HjJ.

zkdJ Ql1 Width If the dexterity is not synchronized with the voltage of the AC power supply Q, the switch 4I/ will turn ON' and OFF.
Since the U' pressure is not necessarily zero during production, pupil switching bounce occurs, which becomes noise and is transmitted to the computer, which may cause malfunction. In order to eliminate such drawbacks, as shown in FIG.
A zero-crossing detection circuit 4VA for the power supply voltage shown at J is provided to generate a pulse at the zero-crossing point as shown in FIG. 10B, and supplies this to a pulse shaping circuit eB. The input side of the pulse shaping circuit 117B is supplied with pulses as shown in FIG. 70C from the differential amplifier 1, and the output side is supplied with pulses as shown in FIG. A pulse is output. By controlling the SCR of switch l/ with this pulse,
Since 5CFt always turns on and off at the instant when the *W voltage becomes zero, the above-mentioned noise does not appear.

As mentioned above, the power supply to the heater/l is controlled by turning the commercial power supply ON and OFF using the switch q, but the duty cycle of the switch pulse that triggers the switch q is determined by the integral control circuit 3≦. It changes approximately in proportion to the output 't4L pressure e. For example, if it is assumed that the output voltage e changes from 2 to 5 with Ov as the center depending on the difference between the detected temperature and the set temperature, then the output voltage e
When is OV, a switch pulse with a duty cycle of 50% is obtained, where f near 0 - the humidity in the cell multiplied by the set humidity is maintained at i1. Now, if the period of #M tooth wave storm voltage is 0.1 seconds, O, OS
The switch nail is turned on every second, and UII' is turned on 'L,,S'
Every half cycle the commercial whale will be -Ill G. As the output-pressure e approaches 1λ■, the duty cycle becomes larger, the heater 11 is supplied with g over the 3,1,4th period of the power supply, and the switch 4Z/ is always turned on at e=□-koV. ON, and the total -m voltage is I#I)II+0 In this way, the heater drive ft1ll (II
If the J circuit is configured, the output voltage will be e or Ovrii
1bl' [Thus, the set temperature l can be easily changed.

The present invention is limited only to the embodiments described above.
If it < , many variations are possible. For example, the first
The heat capacity bar can be increased by gradually increasing the wall thickness of the side Mj 113B of the thermostatic frame 13 as it moves away from the Peltier cord /j as tJ<'4 in the figure. With this configuration, the constant humidity frame 13 can be evenly heated. Furthermore, in the above example, the temperature sensor was placed outside the flow cell 12, and the heat delay plate 19 was inserted between the temperature sensor and the heater/l.
It is also possible to surround the 70-7 cell 12 with a heater/I and arrange the temperature sensor 〃' within the 70-cell as shown in FIG. Of course, in this case the heat delay plate is no longer necessary. However, if the temperature sensor 2D/ is arranged in the 70-cell 12 in this way, problems such as contamination between successive liquids and durability of the temperature sensor will occur, so the temperature sensor is placed in the 70-cell 12.
According to the present invention, the temperature sensor is preferably placed outside the cell, and the heat delay plate can be omitted. Such embodiments are shown in FIGS. 13 and 11. In the example shown in Figure 73, the heater 1g
Flow cell divided into two parts in the space surrounded by /J
A, /2B and these solo cells 1&i'
A foil temperature sensor is inserted into the 'xQ'#
Liquid is introduced equally into both flow cells via //.

In this case, can photometry be performed using one 70-cell?
It is also possible to perform the measurement using both 70-cells, and in the case of a sharp neck, the reliability of the measurement can be increased by 1.

The example shown in FIG. 13 is a modification of the one shown in FIG. Insert 1
stomach) .

Further, in the above-described embodiment, a Peltier element was used as the cooling heat source, but it is of course possible to use other cooling means, and it is also possible to use a heater other than the makiume heater as the heat source. Furthermore, in the case where the humidity of the surrounding air does not change much, the cooling heat source 15 does not need to be controlled and the auxiliary temperature sensor n can be omitted.

1: In the present invention, the temperature of the liquid is detected by a sensor, and the detected output is supplied to the proportional control circuit, the circuit and the minute control circuit, and the output is Speak JlII tun to Kazuya. , so that even if there is a sudden temperature change, it is possible to quickly maintain a constant temperature of the newly pickled vegetables, and also to suppress offset. In particular, by appropriately combining the characteristics of these three types of control circuits and the characteristics of the heat delay plate, the operating characteristics of the control system can be adjusted, and the best control suitable for the purpose of use can be performed.

[Brief explanation of drawings]

Figures 7 and 7B are perspective views of a conventional 70-cell using a Peltier element as a heating source and a cooling heat source, and Figure 2 shows the configuration of an example of a liquid container to which the temperature control method of the present invention is applied. Figure 3 is the thermal equivalent circuit diagram, Figure 4 is the temperature change in the flow cell and humidity change of the m degree sensor, Figure 3 and tllt diagram are the heat delay plate. The thermal time constant is 7 nitrogen.
Graphs showing temperature overshoots when the temperature is set larger and smaller than the thermal time constant of the cell, FIG. 914 is a block diagram showing a smaller configuration of an example of the switching pulse generation circuit, and FIGS. 10 A to 0 are temporary diagrams for explaining the operation. , 1/1 to 11 are cross-sectional views showing the configuration of other examples of the Kintatani device to which the temperature control method of the present invention is applied. ll...liquid 2II tube, /2, /JA, /2
B... Flow cell, 13... Constant temperature frame, /3... Peltier element (cooling heat source), 16... Heat sink, II...
・Heater (heating source 1, /q...fl!% delay plate,〃I
〃'...Humidity sensor, 〃...Koji, Mu...Auxiliary temperature sensor, ii...Bridge, 341...Proportional control circuit, t5...Differential control circuit, 36...- Separate mercenary circuit! ...Heater drive circuit, 36'...Sawtooth wave generation 4
+iS'...Differential jli&single-width amplifier, invasion...pulse teacher circuit, ll...switch, 侭...commercial maryon, pA
...Serocross ridge output circuit, Invasion B...Pulse shaping circuit. Figure 1 1・14 t, i, Figure 5 fth '(1 7th; λ1 8th [, 4 1 Dark Figure 10 11-1:':f Drawing procedure amendment (method) March 1982 1 1'j 1. Indication of the case! 1982 Patent Application No. 160315 2 Name of the invention Liquid temperature control method 3. Person making the amendment Relationship with the case Patent applicant Sekonic Co., Ltd. (037) Olympus Optical Industry Co., Ltd. Subject of 6 corrections
Column 7 for a brief explanation of the drawings in the specification, contents of the amendment (attachment) ■, "@IO Diagram A-GJ" in the 4th line of page 25 of the specification bag is corrected to "Figure 1O M-D" . 1 other person"-17'+5.7

Claims (1)

[Claims] In maintaining the liquid that is intermittently supplied and discharged to and from the container body at a desired set temperature for a desired period while the liquid is stored in the container body, the container body described in 111. The output of a temperature sensor that directly or indirectly detects the temperature of the liquid contained in the liquid is supplied to a control (dllllJl path) that performs proportional control, differential control, and line segment control, and the output of this control circuit is used to A method for controlling the temperature of a liquid, characterized in that the output of the control circuit is modulated with a lower coefficient of repulsion than a commercial source, and the output of the control circuit is modulated with a pulse proportional to the output of the control circuit. IbU control heating source with commercial 111IIi1 waveform
2. A liquid temperature control method according to claim 1, characterized in that: 3. The liquid temperature according to claim 2, characterized in that switching bounce is prevented from occurring by turning on and off at all pyrocross points of the moe storm rM waveform read within the uU pulse interval. Control method. t A cooling heat source i is provided in addition to the controlled heating source, and the temperature is lower than the set temperature. Liquid 7f! degree control method.