JPS596292U

JPS596292U - gas alarm device

Info

Publication number: JPS596292U
Application number: JP9948482U
Authority: JP
Inventors: 満治吉良; 隆司山口; 砂原　将三郎
Original assignee: フイガロ技研株式会社
Priority date: 1982-06-30
Filing date: 1982-06-30
Publication date: 1984-01-14

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図はこの考案の実施例の回路図、第２図は実施例に
用いた自己発熱形のガス検出素子の特性図、第３図は比
較例の回路図、第４図は実施例での素子の抵抗値と加熱
電力および素子の温度との関係を示す特性図、第５図は
ガス濃度と素子温度との関係を示す特性図、第６図はガ
ス濃度と出力電圧との関係を示す特性図である。１・・・自己発熱形ガス検出素子、２・・・Ｎ型金属酸
化物半導体、３．４・・・ヒータ兼用電極、Ｒ１゜Ｒ２
，Ｒ３・・・負荷抵抗、６・・・ヒータ用電源、１１・
・・警報手段、３１・・・ヒータ電力制御手段、３２・
・・リレー。Fig. 1 is a circuit diagram of an embodiment of this invention, Fig. 2 is a characteristic diagram of a self-heating type gas detection element used in the embodiment, Fig. 3 is a circuit diagram of a comparative example, and Fig. 4 is a diagram of the embodiment. Figure 5 is a characteristic diagram showing the relationship between the resistance value of the element, heating power, and element temperature, Figure 5 is a characteristic diagram showing the relationship between gas concentration and element temperature, and Figure 6 is the relationship between gas concentration and output voltage. FIG. 1... Self-heating gas detection element, 2... N-type metal oxide semiconductor, 3.4... Electrode that also serves as heater, R1°R2
, R3... Load resistance, 6... Power supply for heater, 11.
...Alarm means, 31...Heater power control means, 32.
··relay.

Claims

[Scope of utility model registration request]

A self-heating type gas detection element includes a gas-sensitive N-type metal oxide semiconductor, a pair of electrodes connected to the semiconductor, and a heater for heating the semiconductor, and a power source and a load are connected between the two electrodes. A second alarm device is connected in series and is provided with an alarm means for issuing an alarm when the electrical conductivity of the element is higher than a predetermined value based on the detected current to the load, wherein the electrical conductivity of the element is lower than the predetermined value. 1. A gas alarm device comprising: heater power control means that operates to reduce power to the heater when the temperature is below a predetermined value; and a heater power source is connected to the heater via the heater power control means.