JP2000171321A - Digital pressure gauge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make easily and accurately conformable the setting point of a pressure switch by motoring the signal of the pressure switch by a built-in CPU, and registering pressure data when the signal changes in an internal memory. SOLUTION: The digital pressure gauge 1 for measuring industrial instrumentation pressure has, for example, a terminal 4 for inputting a signal from a pressure switch 6, and is constituted so as to display state by monitoring a pressure switch output signal 7 by a CPU built in the digital pressure gauge 1. When the pressure gauge 1 is turned on by a switch 5, the CPU starts sampling of the pressure switch output signal 7, and when obtaining data different from the last gathered data, the data is stored in a memory of the CPU. Memorized information is read out by a prescribed key of the switch 5, and the memorized information and a memorized pressure value are displayed, for example, on a display part when the pressure switch output signal 7 becomes either of ON and OFF.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital pressure gauge for mainly measuring pressure in industrial measurement.

[0002]

2. Description of the Related Art Conventionally, a person has recorded a reading value of a digital pressure gauge when a pressure switch is turned ON / OFF on a reading paper.

[0003] This is data to be used for reliability because it includes an unstable element such as a pressure rise / fall speed difference and a human reading error because reading is performed instantaneously while the pressure is being changed.

[0004]

In the above-mentioned conventional method, it is difficult to accurately confirm the ON / OFF setting pressure of the pressure switch. An object of the present invention is to provide a digital pressure gauge capable of measuring ON / OFF set pressure of a digital pressure gauge with high accuracy and in a short time.

[0005]

In order to achieve the above object, a digital pressure gauge is provided with a terminal for inputting a signal from a pressure switch, and the signal of the pressure switch is monitored by a CPU built in the digital pressure gauge. The pressure data when the signal from the pressure switch changes is registered in the internal memory.

Further, the signal state of the pressure switch is displayed on a digital pressure gauge so that a person can see it.

[0007]

FIG. 2 is an external view of a digital pressure gauge and a connection diagram for measuring a pressure switch.

The external appearance of the digital pressure gauge 1 is the pressure inlet 2
The display unit 3 displays the input pressure value, the signal state of the pressure switch, and the state of whether or not the measurement of the pressure switch is being measured. The terminal 4 for inputting the signal from the pressure switch is used for measurement. It consists of a switch 5.

When measuring the pressure switch, the terminal 4 for inputting a signal from the pressure switch provided on the digital pressure gauge 1 to the pressure switch output signal 7 of the pressure switch 6 is connected. Further, the pump 8 for generating pressure and the pressure generated from the pump 8 are connected by a pressure pipe 6 for transmitting the pressure to the pressure switch 6 and the digital pressure gauge 1, and the pressure is generated from the pump 8 and the pressure is transmitted to each device. The setting of the pressure switch 6 will be measured.

FIG. 1 is an internal block diagram of the digital pressure gauge 1.

The pressure P generated from the pump 8 is transmitted to a pressure sensor 10 built in the digital pressure gauge 1, and the pressure P
Is transmitted to the CPU 12. CPU1
2 calculates the electric signal 11 and displays the pressure value on the display unit 3.

The CPU 12 constantly monitors the pressure switch output signal 7 and displays the state of the pressure switch output signal 7 on the display unit 3.
To be displayed.

FIG. 3 shows a time chart of the pressure memory of the CPU 12.

A switch 5 provided on the digital pressure gauge 1
Is ON, the CPU 12 outputs the pressure switch output signal 7
Starts sampling. The sampling is compared with the data taken last time, and when data different from the previous time is obtained, the CPU
The pressure memory operation is applied to the memory 12 and stored in the memory of the CPU 12. At this time, information is also stored in the memory as to whether the pressure switch output signal 7 has changed from L to H and stored, or whether the pressure switch output signal 7 has changed from H to L and stored.

A switch 5 provided on the digital pressure gauge 1
Is turned off, sampling ends.

The stored information is read out by a read key of a switch 5 provided on the digital pressure gauge 1, and the display unit 3 stores the pressure switch output signal 7 from H to L or from L to H. Information indicating the fact and the stored pressure value are displayed.

[0017]

According to the present invention, it is possible to easily and accurately confirm the set point of the pressure switch by using a digital pressure gauge having this function.

[Brief description of the drawings]

FIG. 1 is an internal block diagram of a digital pressure gauge according to the present invention.

FIG. 2 is an external perspective view of a digital pressure gauge.

FIG. 3 is a time chart of a pressure memory.

[Explanation of symbols]

1: Digital pressure gauge, 2: Pressure inlet, 3: Display, 4
... input signal terminals, 5 ... various switches, 6 ... pressure switches, 7 ... pressure switch signals, 8 ... pressure generating pumps, 9 ...
Pressure piping, 10 ... pressure sensor, 11 ... pressure signal, 12 ...
CPU.

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Yasuo Ishijima 500-Yuyama, Uchihara-cho, Higashi-Ibaraki-gun, Ibaraki Prefecture Within Hitachi Naka Electronics Co., Ltd. 500 transliteration mountain Hitachi Naka Electronics Co., Ltd. F term (reference) 2F055 AA40 BB20 CC60 DD20 EE35 FF28 GG03 HH05

Claims (2)

[Claims] In a digital pressure gauge, an electric signal of a pressure switch is input to a digital pressure gauge, and an O of the pressure switch is
A digital pressure gauge which automatically stores an N / OFF set pressure value. 2. The digital pressure gauge according to claim 1, wherein a display function is provided so that the current signal state of the pressure switch is ON or OFF.