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Title:
PHOTOIONIZATION DETECTOR
Document Type and Number:
Japanese Patent JP2003098153
Kind Code:
A
Abstract:

To provide an photoionization detector in which lowering of sensitivity can be suppressed.

An photoionization detector comprising a detection chamber provided with a translucent window and an applying electrode and introducing or discharging a measuring fluid, a lamp for irradiating the detection chamber with UV-rays of short wavelength through the translucent window, a circuit for exciting the lamp, a circuit for applying a voltage to the applying electrode, and a circuit for detecting a measurement signal from the applying electrode is further provided with an on/off valve provided in the detection chamber in order to introduce or discharge the measuring fluid, a circuit for holding an output signal from the detection circuit, and a synchronization circuit for delivering a drive signal intermittently to the on/off valve and the exciting circuit every predetermined time and delivering a signal for holding the output value upon elapsing a specified time after lamp excitation to the hold circuit.


Inventors:
SHIBATA SHOZO
MURATA AKIHIRO
SAITO MIKA
Application Number:
JP2001296446A
Publication Date:
April 03, 2003
Filing Date:
September 27, 2001
Export Citation:
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Assignee:
YOKOGAWA ELECTRIC CORP
International Classes:
G01N27/64; G01N30/64; (IPC1-7): G01N27/64
Domestic Patent References:
JPH04319659A1992-11-10
JPS62294961A1987-12-22
JPH06294772A1994-10-21
JPH09138218A1997-05-27
JPH09243601A1997-09-19
JPH01301160A1989-12-05
JPS6242372Y21987-10-30
Foreign References:
US5206594A1993-04-27



 
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