JPS5589740A - Gas detector - Google Patents
Gas detectorInfo
- Publication number
- JPS5589740A JPS5589740A JP16292378A JP16292378A JPS5589740A JP S5589740 A JPS5589740 A JP S5589740A JP 16292378 A JP16292378 A JP 16292378A JP 16292378 A JP16292378 A JP 16292378A JP S5589740 A JPS5589740 A JP S5589740A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- power supply
- detection element
- heater
- resistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
Abstract
PURPOSE: To enable to stabilize the total power of detection element, by falling the heater voltage of semiconductor gas detection element of self-heating type to the increase in the power supply voltage.
CONSTITUTION: The constant current circuit consisting of the transistor 10, resistor 8, Zener diode 9, the diode bridges 4W7 and resistor 11 is connected to the power supply 1 in series with the primary winding 2 of the power supply transformer for heater power of detection element. Thus, the current fed to the transformer can be stable. With the voltage dividing point dividing the power supply voltage with the resistors 21, 22, the voltage detection circuit consisting of the diode 20, Zener diode 19, resistor 18, and capacitor 17 is provided. When an output is produced from this circuit, the output controls the transistor 16 and changes the secondary load of the transformer, to control the supply corrent to the heater 23 of the detection element. Accordingly, the voltage fed to the heater 23 of detection element is fallen with the power supply voltage increase.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16292378A JPS5589740A (en) | 1978-12-28 | 1978-12-28 | Gas detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16292378A JPS5589740A (en) | 1978-12-28 | 1978-12-28 | Gas detector |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5589740A true JPS5589740A (en) | 1980-07-07 |
Family
ID=15763798
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16292378A Pending JPS5589740A (en) | 1978-12-28 | 1978-12-28 | Gas detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5589740A (en) |
-
1978
- 1978-12-28 JP JP16292378A patent/JPS5589740A/en active Pending
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