JPH0579696U - Alarm display device - Google Patents

Abstract

(57) [Summary] [Purpose] One display unit that displays the measured value can also serve as an alarm display, and the alarm display can be confirmed visually in a reliable manner in parallel with the measurement operation. [Structure] A detection signal S1 of each sensor 4 provided corresponding to the number of channels is amplified by an amplifier circuit 7 and input to a corresponding comparator 10. On the measured value display portion 2, the detection signal S1 from the sensor 4 operated by pressing the select switches 3a to 3f is digitally displayed as a measured value. Each comparator 10 compares the detection signal S1 with a preset alarm value, and when it matches or exceeds the alarm value, the corresponding latch circuit 11 outputs a set signal S3 to the OR circuit 12.
The OR circuit 12 switches the power supply relay by the set signal S3 from the latch circuit 11 to change the display color of the measured value display section 2 for digitally displaying the measured value from yellow green indicating a normal state to red indicating an abnormal state. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an alarm display device that displays a message when a measured value detected by various sensors exceeds a preset alarm value.

[0002]

[Prior Art]

 For example, a gas densitometer that detects and measures the concentration of gas such as oxygen will be used as an example. In this type of gas densitometer, the measured value (gas concentration) detected by the sensor can be checked visually. It is designed to be digitally displayed on the display unit provided on the front surface. When the measured value exceeds the preset alarm value, a buzzer sounds to prompt an alarm, or a light emitting element provided separately from the measured value display section emits red light, for example. There was a display indicating the warning.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned conventional gas concentration meter, the structure that sounds the buzzer at the time of the alarm has a problem that mechanical components such as a speaker that require a large mounting space hinder the miniaturization of the device. ..

Further, in the configuration in which the light emitting element for alarm is arranged separately from the display section for displaying the measured value, not only the number of constituent parts increases but also the arrangement and mounting space of each part contribute to the light emitting element itself. Since the size is small and unobtrusive, if the eyes of the measured value are distracted, the alarm may be inadvertently overlooked, resulting in lack of reliability.

Therefore, the present invention has been made in view of the above-mentioned problems, and an object thereof is to enable a single display unit for displaying a measured value to also serve as an alarm display, and to perform a reliable operation in parallel with the measurement operation. Another object of the present invention is to provide an alarm display device capable of visually confirming the alarm display.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, an alarm display device according to the present invention comprises a display unit for displaying a measured value, and means for changing a display color when the measured value exceeds a predetermined alarm value. I am trying.

[0007]

[Action]

 When the measured value exceeds a predetermined alarm value set in advance, the display unit for displaying the measured value changes the display color to another color indicating an alarm.

[0008]

【Example】

 FIG. 1 is a block diagram showing an embodiment of an alarm display device according to the present invention, and FIG. 2 is a sectional view showing the outer appearance of a front operation panel of the alarm display device.

The alarm display device in this embodiment is applied to, for example, a gas concentration meter, and as shown in FIG. 2, a measured value display section 2 is provided on the upper left portion of the front operation panel 1 which constitutes a part of the madness. It is arranged. The measurement value display unit 2 is composed of a plurality of light emitting elements such as LEDs, and displays the amount of gas (for example, oxygen) of one channel selected from a plurality of channels that can be detected by the sensor 4 as a digital value in percentage. There is.

Further, in parallel with the measured value display portion 2, in the upper right portion, there are arranged six selector switches 3a, 3b, 3c, 3d, 3e, 3f, such as, for example, an elevating switch. It is set up. The select switches 3a to 3f are provided corresponding to the number of input channels (6 channels) by the sensor 4, and when selected by a push operation, the operation surfaces of the switches 3a to 3f are lit and are currently selected. The structure is such that the existing channels can be visually confirmed.

Further, a channel alarm indicator 5 is arranged below the select switches 3a to 3f. The channel alarm indicator 5 is composed of, for example, a light emitting element such as an LED, and when the measured value detected by the sensor 4 is equal to or exceeds a preset alarm value, the channel alarm indicator 5 lights up in red to indicate the alarm.

Further, a reset switch 6 is provided in parallel with the select switch 3f at the right end so as to cancel the alarm display by the pushing operation.

Next, a block configuration of the alarm display device will be described with reference to FIG. This alarm display device includes an amplifier circuit 7, a selector 3, an A / D conversion circuit 8, a setter 9, a comparator 10, a reset switch 6, a latch circuit 11, a channel alarm indicator 5, an OR circuit 12, a timer circuit 13, The display switching control circuit 14 is provided, and the setting color changer 9, the comparator 10, the reset switch 6, the latch circuit 11, the OR circuit 12, the timer circuit 13, the display switching control circuit 14 and the display color control circuit 15 are provided. Is composed of.

The amplifier circuit 7 is provided at the subsequent stage of each sensor 4, increases the detection signal S 1 from the sensor 4, and outputs the amplified detection signal S 1 to the corresponding comparator 10 and selector 3.

When any one of the select switches 3 a to 3 f is pushed, the selector 3 outputs the detection signal S 1 from the amplifier circuit 7 corresponding to the select switch 3 a to 3 f to the A / D conversion circuit 8. ing.

The A / D conversion circuit 8 converts the detection signal S1 input through the pushed select switches 3a to 3f into a digital signal and outputs the digital signal to the display switching control circuit 14.

The setter 9 is connected to each comparator 10 in correspondence with the number of channels so that an alarm value indicating the upper and lower limit values when an abnormality occurs can be preset and input to each of the four sensor words. It has become.

The comparator 10 is provided at the subsequent stage of each amplifier circuit 7, compares the value of the detection signal S1 from the amplifier circuit 7 with the alarm value set in the setter 9, and the value of the detection signal S1 is the alarm value. The drive signal S2 is output to the latch circuit 11 when it is equal to or exceeds the upper limit or the lower limit.

When the drive signal S 2 is input from the comparator 10, the latch circuit 11 controls lighting of the corresponding channel alarm indicator 5 and outputs a set signal (“1” signal) S 3 to the OR circuit 12. ing.

Each latch circuit 11 is connected to a common reset switch 6 so that the alarm of the channel alarm indicator 5 is stopped and the alarm is released based on the alarm release signal S4 from the reset switch 6. It has become.

The OR circuit 12 outputs the switching signal S5 to the display switching control circuit 14 when the set signal S3 is input from any one of the latch circuits 11.

The timer circuit 13 has a predetermined time until the sensor output is input to the amplifier circuit 7 so that the display color of the measured value display unit 2 does not change from yellow green (normal state) to red indicating an abnormality immediately after the power is turned on. The switching prohibition signal S6 is output to the display switching control circuit 14 only (this time can be set arbitrarily).

The display switching control circuit 14 displays the value of the digital signal from the A / D conversion circuit 8 as a measured value and displays it in percentage on the measured value display section 2. Further, the display switching control circuit 14 turns on a power supply relay (not shown) based on the switching signal S5 from the OR circuit 12 to switch the power supply position of each LED of the measured value display unit 2 to display a color. Changes from yellow-green to red and outputs an alarm.

Further, the display switching control circuit 14 does not switch the power supply location of each LED of the measured value display portion 2 while the switching prohibition signal S6 is being input from the timer circuit 13, and the display color is yellow indicating a normal state. It is controlled to keep it in green and not output an alarm.

Next, the operation of the alarm display device configured as described above will be described. When the device is powered on, the detection signal S1 from each sensor 4 is amplified by the amplifier circuit 7 and input to each corresponding comparator 10.

Here, when the measured value of the sensor 4 corresponding to the channel CH1 is digitally displayed on the measured value display unit 2, one of the plurality of select switches 3a to 3f of the selector 3 corresponds to the channel CH1. The select switch 3a is pushed.

As a result, the operation surface of the select switch 3a is turned on, and the detection signal S1 from the corresponding amplifier circuit 7 (7a) is input to the A / D conversion circuit 8. The A / D conversion circuit 8 converts the input detection signal S1 into a digital signal and outputs it to the display switching control circuit 14. The display switching control circuit 14 displays the value of the converted digital signal as a measured value on the measured value display section 2 in percentage.

At this time, the switching prohibition signal S6 is input from the timer circuit 13 for a predetermined time after the power is turned on to the display switching control circuit 14, and the measurement is performed while the switching prohibition signal S6 is input. The power supply locations of the LEDs forming the numbers in the value display section 2 are not switched, and the display color is kept in yellow green, which indicates a normal state, so that no alarm is output.

Here, of the detection signals input to the comparator 10 from each sensor 4, for example, the value of the detection signal from the sensor 4 corresponding to the channel CH3 is the upper limit of the alarm value set by the setter 9. Alternatively, when the value is equal to or exceeds the lower limit, driving death S2 is output to the latch circuit 11. The latch circuit 11 turns on the channel alarm indicator 5 by the drive signal S2 and outputs the set signal S3 to the OR circuit 12.

When the set signal S3 is input to the OR circuit 12, the switching signal S5 is input to the display switching control circuit 14, and the display switching control circuit 14 turns on the power supply relay based on the switching signal S5. The power supply point of each LED of the measured value display section 2 is switched, the display color is changed from yellow green indicating a normal state to red indicating an abnormal state, and an alarm is output.

As the display value at this time, the measured value of the channel CH1 of the select switch 3a pushed by the selector 3 is displayed.

Because of this. If the channel outputting the alarm and the channel displayed on the measured value display unit 2 are different, pressing the select switch 3c with the channel alarm indicator 5 lit will cause the measured value on channel CH1 to be measured. Instead of, the measured value of the alarm channel is displayed on the measured value display section 2.

Then, after confirming the channel in which the alarm is issued, the channel alarm indicator 5 is turned off, and the display color of the measured value display unit 2 is returned to the yellowish green color indicating the normal state. Presses the reset switch 6.

Therefore, in the above-mentioned alarm display device, when an abnormality occurs, the display color of each LED forming the number when the measured value is displayed on the measured value display section changes from yellow green indicating a normal state to red. Since the configuration is variable, one measured value display that displays the measured value can also be used as an alarm display, improving space efficiency and ensuring the visual confirmation of the alarm display in parallel with the measurement operation of the desired channel. It can be carried out.

By the way, in the above-mentioned embodiment, the case where the present invention is applied as an alarm display device of a gas concentration meter has been described as an example, but various sensors for measuring various physical quantities such as temperature, humidity, pressure and flow rate are used. It may also be used as an alarm display device of a conventional measuring instrument.

Further, in the above-described embodiment, the case where the display color of the measured value is yellow-green when it is in a normal state and changes to red when an alarm is issued in an abnormal state has been described. In this case, the colors may be displayed in different colors such as green and orange.

[0037]

[Effect of the device]

 As described above, according to the alarm display device of the present invention, one display unit for displaying the measured value can also serve as the alarm display, so that the space efficiency is improved and the measurement operation can be performed reliably in parallel. The alarm display can be visually confirmed.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an alarm display device according to the present invention.

FIG. 2 is a diagram showing an appearance of a front operation panel of the alarm display device.

[Explanation of symbols]

 2 ... Measured value display unit (display unit), 15 ... Display color control circuit.

Claims (1)

[Scope of utility model registration request] 1. An alarm display device comprising: a display unit for displaying a measured value; and a unit for changing a display color when the measured value exceeds a predetermined alarm value.