Delphian Corporation

Delphian Partners

Eric S Micko

David M Hadden

Mark S Zetter

Methods and apparatus for remote calibration of combustible gas detectors in which calibration initiation signals are applied to a sealed, explosion-proof sensor assembly to effect a remote calibration sequence and storage of calibration factors.

Remote calibration system

Methods and apparatus for measuring combustible gases in which an active sensor is maintained at controlled, temperature in respect of a reference sensor by means of a bridge-sampling system and a variable duty cycle system responsive to the bridge sampling system adapted to periodically bypass the current from the active sensor in a reference bridge network.

Combustible gas detection system

A portable self-calibrating pH meter particularly adapted for use by unskilled operators in adverse environment conditions is disclosed which has a minimum of operator controls while preventing operator errors and while providing effective and accurate pH measurement.

Automatic portable pH meter and method with calibration receptacle

An apparatus for measuring electrochemical species in well drilling mud. The apparatus comprises a sulfide electrode, a pH electrode and a reference electrode. An electrical circuit is provided therefore which provides temperature compensation of the electrochemical signals. A method of using said apparatus to determine hydrogen sulfide in well drilling mud is disclosed.

Method and apparatus for monitoring sulfide in well drilling mud

Methods and apparatus relating to systems for determination of sulfide species and hydrogen sulfide hazard potential of well drilling mud.

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Los Altos Hills, CA, United States of America

Eric S Micko