Title:
インタフェース回路
Document Type and Number:
Japanese Patent JP6773373
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an interface circuit that, when a chromatic voltage gas detector is connected thereto, can monitor gas leak detection with the chromatic voltage gas detector.SOLUTION: An interface circuit comprises: a pair of input/output terminals 101, 102; a connection change-over switch SW3 that is connected to one of the input/output terminals 101, 102 at one end and connected to the ground at the other end; a connection change-over switch SW4 that is connected to one of the input/output terminals 101, 102 at one end and connected to an input terminal of a first detection part 104 at the other end; a Zener diode ZD1 that is connected in parallel to the connection change-over switch SW4, when a voltage less than a prescribed value is applied thereto, does not cause current to flow to the input terminal of the first detection part 104, and when a voltage equal to or larger than the prescribed value is applied thereto, causes current to flow to the input terminal of the first detection part 104; and a control part 106 that controls the connection change-over switches SW3, SW4.SELECTED DRAWING: Figure 1
Inventors:
Hisaya Underground
Matsuura Tomo
Matsuura Tomo
Application Number:
JP2017062939A
Publication Date:
October 21, 2020
Filing Date:
March 28, 2017
Export Citation:
Assignee:
Azbil Co., Ltd.
International Classes:
G01F3/22; A62C2/04; F16K17/36; G01F1/00; G08B21/16; G08B29/10
Domestic Patent References:
| JP4507323B2 | ||||
| JP6725173B2 | ||||
| JP3487528B2 | ||||
| JP3487529B2 |
Attorney, Agent or Firm:
Hamada Hatsune
Nakashima Shigeru
Tatsuya Sakamoto
Tsujioka Masaaki
Kazuma Inoue
Nakashima Shigeru
Tatsuya Sakamoto
Tsujioka Masaaki
Kazuma Inoue