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Gas monitor using electrochemical cell and method of operating

An electrochemical and gas technology, applied in the field of monitors, can solve problems such as faults in the monitoring system, and achieve the effect of fast calculation

Active Publication Date: 2007-07-11
HONEYWELL ANALYTICS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There may be a fault or background signal in the EC cell itself, or in this monitoring system, or due to radio frequency interference or transient electrical conditions, not necessarily the concentration measurement of the gas being monitored

Method used

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  • Gas monitor using electrochemical cell and method of operating
  • Gas monitor using electrochemical cell and method of operating
  • Gas monitor using electrochemical cell and method of operating

Examples

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Embodiment Construction

[0031] Referring to Figure 1, gas is drawn from the volume being monitored through a filter 4 into a gas detection or monitoring device 2, which may be referred to as an aspirator. The gas to be monitored is conveyed from the filter 4 through the inlet channel 15 to the electrochemical cell 7 ("sensor"). The gas then passes through channel 3 to a fluid measuring device (flow meter) 5, which then passes through channel 3A to a gas pump 6 which returns the gas through outlet channel 3B to the system being monitored. Pump 6 is preferably a conventional diaphragm pump with a controllable flow rate, as will be described further below.

[0032] The EC cell 7 generates an electrical signal which is connected along lead 16 to a conventional gas detection sensor circuit 10 for detecting the signal of the EC cell 7 and processing it into a digital electrical signal representing the output of the EC cell 7 . In turn, this digital signal is fed to a processor-based controller 8, which is...

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Abstract

A method and apparatus for gas detection uses a sensor such as an electrochemical (EC) cell and includes a feedback control loop to control a pump to establish a first predetermined gas flow rate to the EC cell. The concentration of the gas at the first predetermined flow rate is measured. If the detected concentration exceeds a predetermined Alert value at the first flow rate an Initial Warning without remedial action is generated, and, the system then changes the gas flow rate before an Alarm is indicated. An Alarm is signaled only if the system verifies the first measurement. Preferably the first flow rate is set to optimize the measurement accuracy of the EC cell being used, and the second flow rate is lower than the first. Verification of an Alarm at the first flow rate may be conducted quickly by a quick-reaction process. The controller may periodically cycle the flow rates between the first and second rates for better accuracy and faster verification times.

Description

[0001] related application [0002] This is the title of co-pending, commonly owned Provisional Application No. 60 / 537,087, filed January 15, 2004, and filed April 30, 2004, entitled "Gas Monitor Using an Electrochemical Cell and Method of Operation" Nonprovisional Application No. 60 / 567,140 for "Gas Monitor Using Electrochemical Cell and Method of Operation." technical field [0003] The present invention relates to monitors using electrochemical (EC) cells for detecting and measuring the concentration of gases, typically toxic or otherwise objectionable gases or fluids. Background technique [0004] Electrochemical cells are used to detect the presence and measure the concentration of gases or other fluids. It is known that different cells tend to be sensitive to different specific gases or other fluid / sensor combinations, where, as in the case of electrochemical cells, the sensitivity of the sensor is affected by the presence of a diffusion layer within the fluid. The s...

Claims

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Application Information

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IPC IPC(8): G08B17/10G01N7/00G01N33/00
CPCG01N33/0063
Inventor 约翰·A·蒂韦特卡里·S·斯通理查德·A·格尔尼约翰·查普勒斯伊恩·罗宾斯
Owner HONEYWELL ANALYTICS AG