JPH08136521A - Column oven - Google Patents

Abstract

PURPOSE: To obtain a column oven in which a user is provided with required information simultaneously when the state of the column oven is indicated. CONSTITUTION: The difference between the temperature in a bath 1 and a set temperature or the operating conditions of a heater 3 are determined and the information thereof is indicated by lighting the segments of a temperature indicator 5 in the bath 1 using one of four digits thereof thus indicating that the heater 3 is turned OFF. On the other hand, the relation of the temperature in the bath 1 to a set temperature is indicated by flickering a specified segment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a column oven for controlling the temperature of a column to a predetermined temperature used for analysis.

[0002]

2. Description of the Related Art Conventionally, in a column oven, the temperature inside a thermostatic chamber has been displayed by using a display section composed of LEDs and a plurality of 7-segment elements. For example, Japanese Patent Application Laid-Open No. 55-79954 is an example of a heating device for selectively displaying necessary display items on a digital display. Items that need to be displayed in the column oven, such as the temperature in the constant temperature bath, temperature setting values,
Alternatively, when performing a selective display using a display unit consisting of a display element with a small number of digits so that the heater control status, etc. can be displayed only for one item, the previous display is erased and the item is switched to display a new item. It was

[0003]

When the display is performed by using the display unit including the display elements having a small number of digits such that only one item can be displayed, it is not possible to display a plurality of items at the same time. Therefore, the user cannot know two closely related items at the same time, and the user needs to perform an operation of switching the displayed items. Since the column temperature is an important parameter for analysis in the column oven, it is very important for the user to be aware of the temperature in the constant temperature bath and the temperature set value. In addition, the column oven is not used as a single unit, but is used in combination with other chromatographic devices.Therefore, the temperature set value sent from the device connected to the outside and the heater on / off operation command It may be controlled. Here, the ON operation is a state in which electric power is continuously or intermittently supplied to the heater to control the temperature, and the OFF operation is irrespective of the temperature inside the tank, the set temperature, etc. It is a state that is not supplied. In such a case, change the changed temperature setting value and heater operating state,
Since it cannot be displayed at the same time as the actual temperature inside the constant temperature chamber, it is not possible to call attention to the user regarding changes in the temperature setting value and heater operating status, which is inconvenient for the user to perform analysis. I sometimes felt.

An object of the present invention is to display the temperature inside the tank, and at the same time, to display the relationship between the temperature inside the tank and the set temperature value by blinking a part of the display element, or the operating state of the heater by lighting the column oven. To provide.

[0005]

In order to solve the above-mentioned conventional drawbacks, the present invention solves the above-mentioned drawbacks by a thermostat containing a heater and a column, a temperature detector inside the thermostat, and a temperature from the temperature detector. The temperature control unit for controlling the temperature in the constant temperature bath based on the comparison of the signal and the temperature set value, and a connection terminal for connecting to an external device, and the internal temperature and temperature set value of the constant temperature bath. A display unit for displaying and a control unit for shortening the blinking cycle of at least a part of the display unit as the difference between the temperature inside the constant temperature bath and the set temperature value is increased.

[0006]

In the present invention, a segment of a single digit of a display element for displaying only one item is turned on, off, or blinks without using a large-sized display device capable of displaying a plurality of items at the same time. Relationship between the actual temperature of the
Alternatively, by displaying the operating state of the heater, the user can switch the display without changing the display, and the actual temperature in the tank of the column oven and the temperature state of what the temperature set value is, and whether the heater is on or off. It is possible to know the operation state of operation. If the difference between the actual temperature in the tank and the temperature setting is large, the blinking should be fast.
When the difference is small, by making the blinking slow, the user can be made aware of how much the difference is. By turning off the blinking segment, the user can know that the temperature in the tank has reached the set temperature.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. FIG. 2 shows the basic configuration of a column oven according to the present invention. A tank containing a column and held at a predetermined temperature, a detector for detecting the temperature inside the tank, and a heater 3 for raising the temperature inside the tank. , An operating unit 4, a display unit consisting of four-digit seven-segment elements 51 to 54, a temperature control inside the tank 1 and a CPU 6 for processing an input from the operating unit 4 and an output to the display unit 5, and an external connection It is provided with a terminal 7 and the like, and is connected to an external device 8 which is another chromatograph device. CP
U6 controls the temperature based on the temperature detected by the detector 2 so that the temperature inside the tank 1 is stabilized at the temperature set value input from the operation unit 4 or the external device 8. Further CPU
By outputting a signal from the display unit 6 to the display unit 5, it has a function of selectively displaying the temperature in the tank 1, the set temperature value, the operating state of the heater 3, the abnormal state, the communication mode with the external device, and the like. ing.

FIG. 1 shows a basic flow chart according to one embodiment of the present invention. The CPU 8 includes a temperature control unit and a display control unit, and determines the relationship between the temperature inside the tank 1 and the set temperature value or the operating state of the heater, and the format to be displayed together with the temperature inside the tank 1 is determined. ing. The display unit 5 whose segment arrangement is shown in FIG. 3 has a function of displaying a decimal point in the digit of 52 and displays the temperature in the tank 1 by the three digits of 51 to 53, and the tank 1 by the digit of 54. Displays the relationship between the internal temperature and the set temperature value, or the operating status of the heater. When the temperature of the tank 1 is lower than the set temperature while the heater of the column oven is turned on, the vertical segment c of 54 of the display 5 is blinked. The blinking cycle is increased or decreased according to the difference between the temperature in the tank 1 and the set temperature value, for example, in inverse proportion to the difference. When the difference is large, the cycle of lighting and extinguishing is shortened to make the blinking fast, and as the difference becomes small, the cycle of lighting and extinguishing is made longer and the blinking is made slower. When the temperature in the tank 1 is higher than the set temperature, the vertical segment b of 54 of the display 5 is blinked. As in the case of blinking the segment c, the cycle of lighting and extinguishing is changed according to the magnitude of the difference between the temperature in the tank 1 and the set temperature value. After the temperature in the tank 1 stabilizes at the set temperature, the segment c or b is kept off. In addition, the CPU is instructed by an abnormal state of the column oven itself or an off operation command from an external device.
6 turns off the heater. In this case, the display 5 indicates that the heater is off by lighting the segment c or the segment b. When the temperature in the tank 1 is lower than the set temperature, the segment c is turned on, and when the temperature in the tank 1 is higher than the set temperature, the segment b is turned on. The blinking state and the position of the segment allow the user to know the state of the temperature inside the tank 1 with respect to the set temperature. Segment c
Or by using segment b for display, 31
It is also possible to use a / 2 digit display. As described above, according to the present embodiment, the relationship between the temperature in the tank 1 and the set temperature is displayed by blinking the one-digit segment of the display element that displays one item at the same time as the temperature in the tank 1. However, since the operating status of the heater is displayed by turning on the light, the user can obtain necessary information at a time without using a large-sized display device capable of simultaneously displaying a plurality of items.

[0009]

According to the present invention, as the difference between the temperature inside the tank and the set temperature value is larger, at least a part of the display unit is made to blink at a faster cycle, thereby displaying the temperature inside the tank. It is possible to display the temperature state with respect to the set temperature value, and it is possible to display the operating state of the heater by turning on a part of the display unit.

[Brief description of drawings]

FIG. 1 is a flowchart of one embodiment of the present invention.

FIG. 2 is a block diagram showing a basic configuration of a column oven according to the present invention.

FIG. 3 is an explanatory view showing the arrangement of each segment of the display unit of FIG.

[Explanation of symbols]

1 ... Tank, 2 ... Detector, 3 ... Heater, 4 ... Operation part, 5 ... Indicator.

Claims (1)

[Claims] 1. A constant temperature bath containing a heater and a column, a temperature detector inside the constant temperature bath, and a temperature control in the constant temperature bath based on a comparison of a temperature signal from the temperature detector and a temperature set value. A display element having a temperature control unit for displaying the temperature inside the constant temperature bath and the temperature set value, and the larger the difference between the temperature inside the constant temperature bath and the set temperature value is, the more at least a part of the display element blinks. A column oven having a display control unit for shortening the cycle.