JPH08249076A - Analog multi temperature controller - Google Patents

Abstract

(57) [Summary] [Purpose] Perform temperature control in an analog manner. [Structure] A temperature range switching operation unit 2 capable of switching a temperature range in a plurality of stages, and a pointer 14 sequentially arranged along a rotation direction of a pointer 14 which is interlocked with an operation of a setting volume 12 for setting a set value, and For the temperature display unit 16 that individually displays the temperatures assigned to the temperature ranges of the plurality of stages in association with the operation of the temperature range switching operation unit 2, and the operation of the temperature range switching operation unit 2. A configuration including a temperature range switching circuit 26 that interlocks and switches the temperature range of the measured temperature in an analog manner.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an analog multi-temperature controller.

[0002]

2. Description of the Related Art Generally, in a multi-type temperature controller, the temperature range detected by a temperature detecting element is switched to a plurality of stages, or the temperature range is not only switched to a plurality of stages, but also the output is heated or cooled. There is also a method of switching to two stages such as, and further, a method of switching the input specifications to two stages.

[0003]

In such a multi-type temperature controller, there is a multi-type temperature controller which has been put into practical use in a digital type with the assistance of a microcomputer. There is no multi-processing control, and some users desire a multi-processing analog temperature control.

Therefore, an object of the present invention is to provide a temperature controller capable of analog multi-processing.

[0005]

In order to achieve such an object, in the analog multi-temperature controller of the first aspect of the present invention, a temperature range switching operation section capable of switching the temperature range to a plurality of stages is provided. , The temperature is arranged along the rotation direction of the pointer interlocked with the operation of the setting volume for setting the set value, and the temperature assigned to each of the plurality of temperature ranges is assigned to the temperature range switching operation unit. It is characterized by comprising a temperature display section that individually displays in association with the operation, and a temperature range switching circuit that switches the temperature range of the measured temperature in an analog manner in association with the operation of the switching operation section. .

The temperature range switching circuit preferably comprises an amplifier circuit for amplifying the measured temperature output, a plurality of resistors connected in series between the input and output parts of the amplifier circuit, and a connection part of the resistors. A plurality of analog switches individually connected between the output section of the amplifier circuit,
The analog switches are individually turned on / off in conjunction with the operation of the temperature range switching operation unit.

The temperature controller preferably further comprises:
A comparison circuit for comparing the measured temperature corresponding to the temperature range switched by the temperature range switching circuit with a set value in the setting volume, an output switching circuit to which the comparison circuit output is given, and at least a heating mode and a cooling mode. An output switching operation unit for switching the output in two stages, the output switching circuit has switching contacts for each of a heating mode and a cooling mode, and the output switching operation unit outputs the comparison circuit output as described above. The switching contacts are individually switched and connected.

The temperature controller preferably further comprises:
An input specification switching operation unit for switching the input specifications and an amplification factor changing circuit for changing the amplification factor of the amplification circuit in the temperature range switching circuit in association with the operation by the input specification switching operation unit.

In the analog multi-temperature controller of the second aspect of the present invention, the temperature range switching operation section is capable of switching the temperature range to a plurality of stages, and the output is switched to at least two stages of the heating mode and the cooling mode. Output switching operation unit, an input specification switching operation unit for switching the input specifications, and sequentially arranged along the rotation direction of the pointer interlocked with the operation of the setting volume for setting the set value, and The temperature range switching unit includes a temperature display unit that individually displays the temperatures assigned to each of the plurality of temperature ranges in association with the operation of the temperature range switching operation unit, and an amplifier circuit. With the temperature range switching circuit that switches the output range of the amplifier circuit in an analog manner in conjunction with the operation of the operation unit, and the input specification switching operation unit An amplification factor changing circuit that changes the amplification factor of the amplification circuit according to the exchanged input specification, and the measured temperature corresponding to the temperature range switched by the temperature range switching circuit is compared with the set value in the setting volume. And an output which is provided with the comparison circuit output and has switching contacts for each of the heating mode and the cooling mode, and which switches and connects the comparison circuit output individually corresponding to the switching contacts by the output switching operation unit. And a switching circuit. In the temperature controller according to the second aspect of the present invention, preferably, the temperature range switching circuit includes a plurality of resistors connected in series between the input / output sections of the amplifier circuit, a connection section of the resistors, and the amplification section. A plurality of analog switches individually connected to the output section of the circuit are provided, and the analog switches are individually turned on and off in conjunction with the operation of the temperature range switching operation section.

[0010]

According to the analog multi-temperature controller of the first aspect of the present invention, when the temperature range switching operation unit switches the temperature range to a plurality of stages, the temperature display unit responds to the temperature range in association with the operation. The temperature is displayed. Then, when the setting volume for setting the set value is operated, the pointer rotates in synchronization with this, and the temperature displayed on the temperature display section at the position indicated by the pointer corresponds to the operation position becomes the set value. .

In this case, the temperature range switching circuit interlocks with the operation of the switching operation section to switch the temperature range of the measured temperature in an analog manner.

This temperature range switching circuit includes an amplifier circuit for amplifying the measured temperature output, a plurality of resistors connected in series between the input and output parts of the amplifier circuit, a connecting part of each resistor and the amplifier circuit. In the case of being configured with a plurality of analog switches individually corresponding to the output section of, the analog switches are individually turned on and off by interlocking with the operation of the temperature range switching operation section, The temperature range will be switched in an analog manner.

Further, the temperature controller further provides a comparison circuit for comparing the measured temperature corresponding to the temperature range switched by the temperature range switching circuit with a set value in the setting volume, and the comparison circuit output. Output switching circuit and at least heating mode and cooling mode
An output switching operation unit for switching the output to a stage, the output switching circuit has switching contacts for each of a heating mode and a cooling mode, and the output switching operation unit switches the comparison circuit output. In the case where the contacts are individually switched and connected, the output is switched between two stages of the heating mode and the cooling mode by operating the output switching operation unit.

Further, the temperature controller further includes an input specification switching operation section for switching the input specifications, and an amplification factor for changing the amplification rate of the temperature range switching circuit in association with the operation by the input specification switching operation section. In the case of including the changing circuit, the amplification factor of the temperature range switching circuit can be changed by operating the input specification switching operation section to adjust the temperature to match the input specification.

According to the analog multi-temperature controller of the second aspect of the present invention, the temperature range switching, the output switching, and the input specification switching can be analogized.

The temperature range switching circuit of the temperature controller includes a plurality of resistors connected in series between the input and output parts of the amplifier circuit, and between the connection part of each resistor and the output part of the amplifier circuit. A plurality of analog switches individually connected to each other, and the analog switches are individually turned on and off in conjunction with the operation of the temperature range switching operation unit, an analog temperature adjustment operation is performed. Can be easily and easily.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a view showing an operation panel of an analog multi-temperature controller according to an embodiment of the present invention, and this operation panel will be described with reference to the figure.

The operation panel 1 is provided with a temperature range switching operation section 2 capable of switching the temperature range in a plurality of stages. In the embodiment, the temperature range switching operation unit 2 can switch to three positions A, B, and C, and when operated to the position A, the temperature range of the temperature controller is set to 0 to 50 ° C. When switched to the first temperature range and operated to the B position, switched to the second temperature range of 0 to 100 ° C, and operated to the C position to the third temperature range of 0 to 400 ° C. It is supposed to switch. The temperature range switching operation section 2 has a + -shaped groove formed for the above operation, and a driver is inserted into the groove for switching operation. The operation section 2 is operated on the rear surface of the operation panel 1. A temperature range changeover switch SW2 (see FIG. 3) described later whose contacts are changed over is provided. It should be noted that the temperature range switching operation unit 2 does not have to be of the type in which the driver is inserted as described above, and may be one that can be operated simply by a knob. The number of temperature range switches and the temperature range are not limited as described above.

The operation panel 1 is also provided with an output switching operation section 4 for switching the output between two stages of a heating mode and a cooling mode. This output switching operation section 4 is formed with a + -shaped groove similar to the above, and a driver is inserted into this groove to switch between the H side in the heating mode and the C side in the cooling mode. Yes,
On the back surface of the operation panel 1, a disk 7 as shown in FIG. 2 which is rotated by the operation of the operation unit 4 and an output changeover switch SW3 (see FIG. 3) described later are integrally provided on the disk 7. There is. Here, the disk 7 is a letter of the alphabet of H showing the heating mode and C showing the cooling mode.
Characters are alternately arranged on the circumference, and the operation panel 1 is provided with an output display window 6 through which the characters on the disk 7 can be exposed. When the output switching operation unit 4 is rotated, the disk 7 rotates, and the contact of the output switching switch SW3 is switched in synchronism therewith to switch between the heating mode H and the cooling mode C, which corresponds to that mode. The symbols H and C are exposed from the output switching display window 6 and the operator can confirm whether the output is the heating mode or the cooling mode. Here, the heating mode refers to a mode in which a heater or the like built in the temperature controller operates to heat, and the cooling mode refers to a mode in which cooling water is supplied or a cooler operates inside the temperature controller. For example, in the heating mode, when the measured temperature is lower than the set value, the heater is heated (ON), and when the measured temperature exceeds the set value, the heater heating operation is stopped (OFF), and the measured temperature is set in the cooling mode. If it is smaller than the value, the supply of cooling water or the operation of the cooler is stopped (OFF), and if the measured temperature exceeds the set value, the cooling water is supplied or the cooler is operated (ON). It should be noted that the output switching operation section 4 may be a knob operation type instead of the driver insertion type as described above.

In the operation panel 1, 8 is an input specification switching operation unit for switching input specifications,
This input specification switching operation section 8 is provided with a + type groove, into which a driver is inserted to insert the Pt side or J
It is operated on the Pt side. The operation panel 1 in the embodiment uses a platinum resistance temperature detector as a temperature detecting element, and an input specification display window 10 for indicating whether the platinum resistance temperature detector is Pt or JPt. Has been formed,
On the back surface of the operation panel 1, a display body (not shown) for displaying the Pt character and the JPt character from the input specification display window 10 is provided. As the temperature detecting element, a thermocouple may be used instead of the platinum resistance temperature detector, and in the case of the thermocouple, an indicator (not shown) indicating whether the type is K type or J type is provided. In the above-mentioned first to third temperature ranges, the temperature detecting elements are platinum resistance temperature detectors Pt, JP.
In the case of t, and when the temperature detecting element is a thermocouple such as K type or J type, for example, the first temperature range is 0 to
200 degreeC, a 2nd temperature range is 0-500 degreeC, and a 3rd temperature range is 0-1000 degreeC. This operation unit is not limited to the type that is inserted into the driver as described above.

On the operation panel 1, in addition to the temperature range switching operation section 2, the output switching operation section 4, the output display window 6, the input specification switching operation section 8 and the input specification display window 10, set values are set. Setting volume 12 for
A pointer 14 provided integrally with the setting volume 12 and interlocked with the operation of the setting volume 12, and the pointer 14
Are sequentially arranged along the rotation direction of the, and the temperatures assigned to the first to third temperature ranges are individually displayed in association with the operation of the temperature range switching operation unit 2. A plurality of temperature display units 16 and an operating state display unit 18 are provided.

Explaining the temperature display section 16,
In the embodiment, the temperature display portion 16 has a total of six temperature display windows 16 for displaying the temperature from the low temperature side to the high temperature side in the clockwise direction along the rotation direction of the pointer 14 on the operation panel 1.
(The reference numeral indicating the temperature display portion and the reference numeral of the temperature display window are the same for easy understanding), and the temperature controller of the embodiment is used as a temperature detecting element on the back surface of the operation panel 1. Since a platinum resistance thermometer is used, 0 to 50 ° C in the first temperature range is divided into 6 equal parts, 0, 10, 20, 30,
40, 50 first number string and second temperature range 0-
100 ℃ divided into 6 equal parts 0, 20, 40, 60, 80, 1
00 second number string and third temperature range 0-400
℃ divided into 6 equal 0,80,160,240,320,4
Alternately with the third number sequence of 00, for example, “0” of the first temperature range, “0” of the second temperature range, “0” of the third temperature range, and “of the first temperature range”. 10 ", second temperature range" 20 ", third temperature range" 80 "...
A gear body (not shown) is arranged on the surface of the gear bodies in such a sequence. When the temperature detecting element is a thermocouple instead of the platinum resistance temperature detector, a number string corresponding to each temperature range is written on this gear body in the same manner as above. The gear body is interlocked with the operation of the setting volume, and the interlocking structure may be that known from, for example, Japanese Utility Model Laid-Open No. 59-152543. In this way, when the setting volume 12 is operated to rotate, the gear body is interlockedly rotated, and along with this, the temperature display windows 16 show 0, 2 in the first temperature range as shown in FIG. 1, for example.
The numbers 0, 20, 30, 40, 50 are pointers 1 in this order.
4 will be displayed along the rotation direction. In the embodiment, the first temperature range is used, the input specification is a platinum resistance temperature detector, the standard is JPt, and the set temperature is 25 ° C. in the first temperature range.

The temperature display unit is not limited to the one in which a plurality of independent display windows are formed along the rotation direction of the pointer as described above, and various types of temperature display units may be used. For example, an arc-shaped opening may be continuously formed along the rotation direction of the pointer, and the temperature may be displayed on the arc-shaped opening. Further, the gear body is not limited to the form in which the numbers for displaying the temperature are written as described above, and the temperature of each temperature range may be switched and displayed by the other form of temperature display.

Next, the internal circuit of the analog multi-temperature controller of this embodiment will be described with reference to FIGS. 3 to 5. The temperature inside the temperature controller is detected by a platinum resistance thermometer or a thermocouple. It is detected by the element 20. The measured temperature detected by the temperature detecting element 20 is given to the amplification factor changing circuit 24 for switching the input specification through the zero adjustment / burnout circuit 22. This amplification factor changing circuit 24
Includes a resistor R1 and a resistor R2 in parallel therewith, and an analog switch AS0 is inserted in the resistor R2.

Here, the amplification factor changing circuit 24 for switching the input specifications will be described. The relationship between the temperature and the resistance value when the temperature detecting element is a platinum resistance temperature detector is Pt and JPt.
4 and the relationship between temperature and thermoelectromotive force in the case of a thermocouple is as shown in FIG. 5 for the J type and K type.

The analog switch AS0 is connected to the power source via the input specification changeover switch SW1, and the input specification changeover switch SW1 is turned on / off in conjunction with the operation of the input specification changeover operation section 8. Therefore, when a platinum resistance temperature detector is used as the temperature detecting element, when the Pt platinum resistance temperature detector is switched by the input specification switching operation unit 8, the input specification changeover switch SW1 is turned on and the analog switch. When AS0 turns on, the resistor R1 and the resistor R2 are connected in parallel, and the input specification switching operation unit 8 causes the JPt
When the platinum resistance temperature detector is switched to, the input specification changeover switch SW1 is turned off and only the resistance R1 is left. Also,
When a thermocouple is used as the temperature detecting element, when the input specification is switched to the K type thermocouple by the input specification switching operation unit 8, the analog switch AS0 is turned on and the input specification is switched to the J type thermocouple. When
The analog switch AS0 turns off. By turning on and off by the analog switch AS0 in this manner, Pt and JPt even for platinum resistance temperature detectors, and the temperatures measured by them for K type and J type even for thermocouples, and the Since the inclination with respect to the output is slightly different as shown in FIGS. 4 and 5, the amplification factor is changed by turning on / off the analog switch AS0 according to the input specifications.

Thus, the temperature measured by the temperature detecting element is changed to the temperature range switching circuit 26 via the amplification factor changing circuit 24.
Given to. The temperature range switching circuit 26 includes an operational amplifier circuit AMP1 and three resistors R3, R connected in series between the output part and the input part of the operational amplifier circuit AMP1.
4, R5, and analog switches AS1, AS2, AS3 connected to the connecting portions of these resistors. Each of the analog switches AS1, AS2, AS3 is connected to a contact of the temperature range changeover switch SW2. This temperature range switch SW2
Indicates that the temperature range switching operation unit 2 has the first temperature range A
When the switch is switched to, the analog switch AS1 is closed to turn on the analog switch AS1 and a resistor R is provided between the output section and the input section of the operational amplifier circuit AMP1.
When all of R3, R4, and R5 are connected in series to have the maximum amplification factor and the temperature range switching operation unit 2 is switched to the second temperature range B, the analog switch AS2 is closed to close the analog switch AS2. Is turned on, resistors R3 and R4 are connected in series between the output section and the input section of the operational amplifier circuit AMP1 so as to obtain a medium amplification factor, and the temperature range switching operation section 2 operates the third temperature range C.
When it is switched to, the analog switch AS3 is turned on by closing the analog switch AS3 side, and the resistor R3 is provided in the circuit of the output section and the input section of the operational amplifier circuit AMP1.
Only those are connected so that the minimum amplification factor is obtained.

Next, the analog switches AS1 to AS
On / off of No. 3 will be described.

Now, assume that the resistance value of the resistor R1 is R1, and the resistance R
3, the resistance value of R4 is aR1, the resistance value of resistor R5 is 2aR
Set to 1. As the thermocouple as the temperature detecting element, when the input specification switching operation section is switched to the J type thermocouple, the analog switch AS0 is turned off. In this input specification state, the temperature range is the first temperature range (0-10
In the case of 0 ° C., only the analog switch AS1 is turned on, so that the amplification factor of the operational amplifier circuit AMP1 is [(aR1
+ AR1 + 2aR1) / R1] = 4a, and when the temperature range is the second temperature range (0 to 200 ° C.), only the analog switch AS2 is turned on. Therefore, the amplification factor of the operational amplifier circuit AMP1 is [(aR1 + aR1) / R1]. = 2
a, and the temperature range is the third temperature range (0 to 400
In the case of (.degree. C.), since only the analog switch AS3 is turned on, the amplification factor of the operational amplifier circuit AMP1 is aR1 / R1 =
a. Further, when switching to the K type thermocouple, the analog switch AS0 is turned on. With this input specification, the temperature range is the first temperature range (0 to 100 ° C)
In the case of, since only the analog switch AS1 is turned on, the amplification factor of the operational amplifier circuit AMP1 is (1 + R1 / R
2) 4a, and the temperature range is the second temperature range (0 to
In the case of 200 ° C., since only the analog switch AS2 is turned on, the amplification factor of the operational amplifier circuit AMP1 is (1 + R
1 / R2) 2a, and when the temperature range is the third temperature range (0 to 400 ° C.), only the analog switch AS3 is turned on, so that the amplification factor of the operational amplifier circuit AMP1 is (1 + R1 / R2) a.

In this way, after the analog switch AS0 of the amplification factor changing circuit 24 is turned on and off to completely change the base portion of the amplification factor calculation of the operational amplification circuit AMP1 according to the input specifications, that is, the thermocouple. When the input specification is J type, the amplification factor calculation base is only R1, and when the input specification is K type, the amplification factor calculation base is (1 + R1
/ R2). Then, the amplification factor is individually changed by the analog switches AS1, AS2, AS3 according to each temperature range according to the change of the base amplification factor according to the input specification.

In this embodiment, the temperature range is three stages, but it may be two stages or four or more stages, and a resistor and an analog switch may be combined according to the number of stages. Further, although the analog switch is used in the embodiment, the invention is not limited to the analog switch, and instead of this, an element which is turned on / off by an analog signal may be used.

Thus, the detected temperature corresponding to the temperature range switched by the temperature range switching circuit 26 is given to the comparison circuit 28 which compares the detected temperature with the set temperature in the setting volume 12. The comparison circuit 28 has an operational amplifier circuit AMP2, and a resistor R6 and a variable resistor VR connected to the power source side and a resistor R7 on the ground side are connected to the input section + of the operational amplifier circuit AMP2.
The connection part with is connected. This variable resistor VR is interlocked with the operation of the setting potentiometer 12, and the voltage corresponding to the preset temperature set by the setting potentiometer 12 is applied to the input part + of the operational amplifier circuit AMP2 by the resistance value of the variable resistor VR. Given. And this operational amplifier circuit AM
The output of the temperature range switching circuit 26 is given to the other input section of P2. Accordingly, the comparison circuit 28 outputs a high-level or low-level comparison output by comparing the measured temperature from the temperature range switching circuit 26 with the set temperature.

The output changeover circuit 30 has an output changeover switch SW3 whose contacts are changed over in association with the output changeover operation section 4 and contacts H of the changeover switch SW3.
Npn transistors TR1 and p, whose bases are individually connected to C and whose emitters are commonly connected to each other,
np transistor TR2, when the output switching operation unit 4 is switched to the heating mode H side, the contact of the switch SW3 is switched to the transistor TR1 side, and the comparison circuit 28 outputs the high level output or the low level output to the transistor TR1. Will be given to the base of. The transistor TR1 is a comparison circuit 28.
When high level or low level output is given from
When turned on or off, the transistor TR2 remains off, and as a result, its output becomes low level or high level. In the heating mode, since the measured temperature has not reached the set value when the high level output is given from the comparison circuit 28, the output switching circuit 30 sets the output to the low level to heat the heater (ON), Since the measured temperature has reached the set value when the low level output is given from the comparison circuit 28, the output switching circuit 30 sets the output to the high level and stops (OFF) the heating operation of the heater. On the other hand, the output switching operation unit 4
Since the contact of the output selector switch SW3 is switched to the side of the transistor TR2 when switched to the cooling mode C side, the measured temperature does not reach the set value when the high level output is given from the comparison circuit 28. Therefore, the output switching circuit 30 sets the output to the high level to stop the supply of the cooling water and the operation of the cooler (O
FF), and when the low level output is given from the comparison circuit 28, the measured temperature exceeds the set value, so the output switching circuit 30 sets the output to the low level to supply the cooling water or operate the cooler ( ON).

[0035]

As described above, according to the first aspect of the present invention, when the temperature range switching operation section is operated to switch the temperature range to a plurality of stages, the temperature display section responds to the temperature range in association with the operation. When the temperature is displayed and the setting knob for setting the set value is operated and the pointer rotates,
The temperature displayed on the temperature display at the position indicated by the pointer will be the set value corresponding to the operation position, and the temperature range switching circuit will link the temperature range of the measured temperature in an analog manner in conjunction with the operation of the switching operation unit. I decided to switch,
The temperature adjustment operation can be performed in an analog manner by switching the temperature ranges in a plurality of stages without the assistance of the microcomputer.

According to the second aspect of the present invention, the temperature adjustment operation can be performed in an analog manner without the assistance of the microcomputer for each of the temperature range switching, the output switching, and the input specification switching.

[Brief description of drawings]

FIG. 1 is a front view of an operation panel of an analog multi-temperature controller according to an embodiment of the present invention.

FIG. 2 is a front view of an output switching display disc disposed on the back surface of the operation panel of FIG. 1 and facing the output display window.

3 is an internal circuit diagram of the temperature controller of FIG.

FIG. 4 is a diagram showing changes in characteristics of Pt and JPt with respect to temperatures when the temperature detecting element is a platinum resistance temperature detector.

FIG. 5 is a diagram showing changes in characteristics of K type and J type with respect to temperature when the temperature detecting element is a thermocouple.

[Explanation of symbols]

 1 Operation panel 2 Temperature range switching operation unit 4 Output switching operation unit 6 Output display window 8 Input specification switching operation unit 12 Setting volume 14 Pointer 16 Temperature display unit 20 Temperature detection element 24 Amplification factor changing circuit 26 Temperature range switching circuit 28 Comparison circuit 30 output switching circuit

[Procedure amendment]

[Submission date] March 15, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0032

[Correction method] Change

[Correction content]

[0032] In this embodiment, the temperature range was 3 stages may be four or more stages at two stages, or the combination of a resistor and an analog switch in accordance with the number of stages.
Further, although the analog switch is used in the embodiment, the invention is not limited to the analog switch, and instead of this, an element which is turned on / off by an analog signal may be used.

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 4

[Correction method] Change

[Correction content]

[Figure 4]

Claims (6)

[Claims] 1. A temperature range switching operation section capable of switching a temperature range in a plurality of stages, and a temperature range switching operation section arranged along a rotation direction of a pointer interlocked with an operation of a setting volume for setting a set value, and A temperature display section that individually displays the temperatures assigned to each of the multiple temperature ranges in association with the operation of the temperature range switching operation section and an operation of the previous temperature range switching operation section An analog multi-temperature controller, comprising: a temperature range switching circuit that switches the temperature range of the measured temperature in an analog manner. 2. The temperature range switching circuit includes an amplifier circuit for amplifying a measured temperature output, a plurality of resistors connected in series between an input / output section of the amplifier circuit, a connection section of the resistors, and the resistor section. A plurality of analog switches individually connected to the output section of the amplifier circuit, wherein the analog switches are individually turned on and off in association with the operation of the temperature range switching operation section. The analog multi-temperature controller according to claim 1. 3. A comparison circuit for comparing the measured temperature corresponding to the temperature range switched by the temperature range switching circuit with a set value in the setting volume, and an output switching circuit to which the comparison circuit output is given. An output switching operation unit for switching the output to at least two stages of a heating mode and a cooling mode, the output switching circuit has switching contacts for each of the heating mode and the cooling mode, and the output switching operation unit. 3. The analog multi-temperature controller according to claim 1 or 2, wherein the output of the comparison circuit is individually switched and connected to the switching contact. 4. The input specification switching operation section for switching the input specifications, and the amplification factor change for changing the amplification rate of the amplification circuit in the temperature range switching circuit in association with the operation by the input specification switching operation section. 3. The analog multi-temperature controller according to claim 2, further comprising a circuit. 5. A temperature range switching operation unit capable of switching the temperature range to a plurality of stages, an output switching operation unit for switching the output to at least two stages of a heating mode and a cooling mode, and switching input specifications. The input specification switching operation unit for operation and the pointers that are arranged sequentially along the rotation direction of the pointer that interlocks with the operation of the setting volume for setting the set value, and correspond to each of the above-mentioned temperature ranges of multiple stages. A temperature display section that individually displays the assigned temperature in association with the operation of the temperature range switching operation section; and an amplification circuit, and the amplification circuit includes an amplification circuit in association with the operation of the temperature range switching operation section. Temperature range switching circuit that switches the output range of the analog in analog, and the amplification according to the input specifications switched by the input specification switching operation unit An amplification factor changing circuit that changes the amplification factor of the path, a comparison circuit that compares the measured temperature corresponding to the temperature range switched by the temperature range switching circuit with a set value in the setting volume, and the comparison circuit output gives An output switching circuit that has switching contacts for each of the heating mode and the cooling mode, and that switches and connects the comparison circuit output to the switching contacts individually corresponding to the output switching operation unit. An analog multi temperature controller. 6. The temperature range switching circuit includes a plurality of resistors connected in series between the input and output parts of the amplifier circuit, and a plurality of resistors individually connected between a connection part of the resistors and an output part of the amplifier circuit. 6. The analog multi-temperature control according to claim 5, further comprising a plurality of analog switches connected in correspondence with each other, wherein each of the analog switches is individually turned on and off in association with an operation of the temperature range switching operation unit. vessel.