Abstract: A conformal coating and method for applying same to a printed electrical circuit board, components and leads for providing corrosion resistance. In a preferred embodiment, the conformal coating comprises a first coating layer of parylene which is vacuum deposited and removably bonded onto an ultra-clean surface of a printed circuit board including attached components and leads. Additionally, a second coating layer of a corrosion inhibiting viscous fluid is deposited onto the first coating layer to form a continuous, stratified, conformal coating which is sealed and corrosion resistant.

Abstract: A system for determining the energy and volume delivered by a flowing natural gas carried within a pipeline based on BTU content analysis of the natural gas using a micro-miniature gas chromatograph. By monitoring key parameters of the flowing natural gas, such as temperature, pressure, flow rate, and BTU content, the system 110 accurately determines the total energy and total volume delivered by the flowing natural gas over a programmable duration of time. Micro-miniature fabrication of the gas chromatograph imparts important advantages to the system 110, including small size, modular design, low power consumption, fast BTU analysis times, and low consumption of consumable carrier and reference gases.

Abstract: A conformal coating and method for applying same to a printed electrical circuit board, components and leads for providing corrosion resistance. In a preferred embodiment, the conformal coating comprises a first coating layer of parylene which is vacuum deposited and removably bonded onto an ultra-clean surface of a printed circuit board including attached components and leads. Additionally, a second coating layer of a corrosion inhibiting viscous fluid is deposited onto the first coating layer to form a continuous, stratified, conformal coating which is sealed and corrosion resistant.

Abstract: A fluid density compensator for flow volume measurements utilizes a plurality of look-up calibration tables, each for a different density gas. The measurement device provides an output signal having a frequency corresponding to the flow rate therethrough. Each of the tables is indexed by frequency and includes, for each frequency, an expected differential pressure reading across the measurement device and a volume factor. The tables are constructed during the manufacture of the meter measuring device, and are stored in a non-volatile memory of a computer associated with the measuring device. Also associated with the measuring device is a differential pressure sensor across the measuring device. During operation, the output frequency of the measuring device is utilized to index into all of the tables and compare the differential pressure stored in the tables with the actual measured differential pressure.