Master-Touch 9700MP HAZ FAT averaging flow tubes are ideal for usage in hazardous areas. These thermal mass flow meters are an indispensable piece of equipment to provide you with precise and dependable flow measurement. Offering an Inline style thermal mass flow design that features the sensing elements openly mounted on the flow suction, these flow meters, from EPI, are available in sizes from 2″ pipe through to 4″ pipe and can be provided with flanged end arrangements if necessary.
The Master-Touch 9700MP HAZ FAT Series is offered in an Integral Style that makes readings exceedingly simple by providing all the electrical apparatuses and mechanisms in a centralized location in an enclosure. A simple yet refined system, these flow meters are an essential piece of engineering.
Master-Touch 9700MP HAZ FAT in-line averaging flow tube flow meters include a rugged, cleanable, thermal mass flow sensor. These units consist of a sensor assembly which utilizes two RTD (Resistance Temperature Detector) sensing elements. The sensors, from Eldridge Products Inc. (EPI), consist of reference grade platinum, ceramic, glass, and stainless steel. Two platinum resistance sensors are built up upon the ceramic substrate and then given a thin glass coating.
The assembly then slips into a stainless-steel sheath for corrosion and abrasion resistance. The flow tube sensor assembly is large, rugged, and relatively insensitive to dirt buildup. During operation, the temperature sensor constantly measures the ambient temperature of the gas. This maintains a reference resistance on one side of a bridge circuit. The second sensor undergoes self-heating to a constant temperature above that of the gas stream from control by the temperature sensor and bridge circuitry. Our bridge maintains the overheat temperature and counterbalances the temperature effects through our proprietary temperature compensation techniques.
Inline style thermal mass flow meters include a flow section that meets the user’s flow conduit. Then it plumbs directly into the process line. The sensing elements of this design mount directly in the flow section for exposure to the process gas. Our inline style thermal mass flow meters are available in sizes from 1/4″ pipe through 4″ pipe or tube. Furthermore, they feature a variety of options such as MNPT ends, tube end fittings, butt weld ends, flanged end configurations, etc. Pipe sizes more than 4″ typically require insertion style thermal mass flow meters.
Integral style flow tube thermal mass flow meters have all the electrical components and connections within one enclosure. This enclosure offers ratings for hazardous environments. The enclosure mounts directly to the inline flow section at the point of measurement. The enclosure includes all the electrical connections as well as the linearizing electronics and the display / keypad assembly.
Our patented Flow Averaging Tube (FAT) designs use the principle of convective heat transfer to directly measure mass flow. Moreover, they are ideal for most applications with limited available straight run. In many installations, the up-stream straight run can reduce to three diameters. The probe has several large diameter inlet ports along the length of the upstream impact surface. The pressure at each inlet port is averaged inside the tube to create the axial flow through the tube and across our flow sensor. The gas returns to the main flow stream through the ports near the sensing elements. Anomalies in the actual flow profile or installations in non-circular ducts may still require some minor adjustment to achieve the best accuracy.
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