Title:
電子制御された直接噴射式泡消火剤送達システム、ならびに導電率測定値に基づいて水流中の泡消火剤の流量を調節する方法
Document Type and Number:
Japanese Patent JP2007537780
Kind Code:
A
Abstract:
Fire fighting equipment uses an electronically controlled direct injection foam delivery system ( 10 ). A water pump ( 14 ) pumps water through a pipe ( 24 ). A foam pump ( 36 ) pumps foam into a mixing chamber ( 46 ) within the pipe to produce a water-foam mixture. A microprocessor-based control circuit ( 20 ) controls the water pump and foam pump. A conductivity sensor ( 50 ) is coupled in-line with the pipe for monitoring conductivity of the mixture and providing a feedback signal to the control circuit to regulate the foam pump. The conductivity sensor uses stainless steel plates ( 60,62 ) positioned in the flow stream of the pipe for measuring conductivity of the mixture. An interface circuit ( 54 ) generates a voltage having dual polarity and a fifty percent duty cycle for the conductivity sensor. A second conductivity sensor ( 30 ) monitors conductivity of the water and provides a feedback signal to the control circuit.
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Inventors:
Roberts, Gary E.
Application Number:
JP2007506234A
Publication Date:
December 27, 2007
Filing Date:
March 22, 2005
Export Citation:
Assignee:
Wataras Company
International Classes:
A62C5/02; A62C27/00; C08K3/00; G01N27/06
Attorney, Agent or Firm:
Hidesaku Yamamoto
Takaaki Yasumura
Natsuki Morishita
Takaaki Yasumura
Natsuki Morishita