Title:
FRAME TYPE ATOMIC ABSORPTION SPECTROPHOTOMETER
Document Type and Number:
Japanese Patent JPH1123453
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To obtain an inexpensive and compact device which dose not need a power source in another system by using a phototransistor for a sensor for monitoring flame. SOLUTION: When flame is ignited, a phototransistor 21 turns into an on- state. Then as a collector current is passed through a load resistance, a collector terminal turns into a low level. Reversely, when flame is not present, the phototransistor 21 turns into an off-state and the collector terminal turns into a high level. As the collector terminal of the phototransistor 21 turns into a high level when frame is not ignited or blown out due to imperfect adjustment to the flow rate of gas, etc., signals from the collector terminal are sent to a microprocessor 1 through an input circuit 2. The microprocessor 1 closes a solenoid valve 11 for combustion gas and a solenoid valve 12 for supporting gas to halt the supply of gas.
Inventors:
SAKAI MASUMI
Application Number:
JP17786697A
Publication Date:
January 29, 1999
Filing Date:
July 03, 1997
Export Citation:
Assignee:
SHIMADZU CORP
International Classes:
G01N21/31; (IPC1-7): G01N21/31
Attorney, Agent or Firm:
Yoshiaki Nishioka