Honeywell Analytics Ag

Honeywell Analytics Limited

Ian Robins

John Chapples

Richard Gorny

John A Tiwet

Cary S Stone

There is disclosed a method of operating a colorimetric gas detector system that comprises a substrate () bearing a material () that can react with a target gas to produce a change in the wavelength of radiation absorbed or transmitted by the material ('color-change material'). The method involves:

Gas detection method and system

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.

Gas monitoring using electrochemical cell and method of operating

Gas monitor using electrochemical cell and method of operating

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Dorchester, United Kingdom

Ian Robins