Featuring a flow section quantified to match the user’s flow channel and plumbed directly into the process line, the 8600-8700 MP Inline Flow Meter Series provides you with the ultimate reliability, precision, and consistency required when dealing with monitoring thermal mass. Offering an Inline style and an integral style configuration that includes all the electrical components and connections in one enclosure for ease of use and simple monitoring, the series 8600-8700 offers you flexibility and consistency regardless of purpose.
Utilizing state-of-the-art technology that makes optimal use of the principle of convective heat transmission to accurately and professionally measure mass flow, these exceptional and specialized Thermal Mass Flow Meters feature numerous thermal mass flow sensors that are high quality and unswervingly effective.
The 8600-8700 MP Inline Flow Meter Series provides accurate, consistent, and rapid real-time flow measurement with a sensor that is both temperature and pressure corrective. Each flow meter, from Eldridge Products Inc. (EPI), undergoes calibration using standards traceable to the National Institute of Standards and Technology (NIST).
Master-Touch Series products 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 are constructed of reference grade platinum, ceramic, glass, as well as stainless steel. Two platinum resistance sensors are built up upon the ceramic substrate and then given a thin glass coating. The assembly is then slipped into a stainless-steel sheath for corrosion and abrasion resistance. The sensor assembly is large and rugged in addition to being relatively insensitive to dirt buildup.
During operation, the temperature sensor constantly measures the ambient temperature of the gas and maintains a reference resistance on one side of a bridge circuit. The second sensor is forced through self-heating to a constant temperature above that of the gas stream. Then it is controlled by the temperature sensor and bridge circuitry. Furthermore, our bridge maintains the overheat temperature and counterbalances the temperature effects through proprietary temperature compensation techniques.
Our inline flow meter for thermal mass flow measurement includes a flow section that is usually specified to match the user’s flow conduit and is then plumbed directly into the process line. This design also has the sensing elements mounted directly in the flow section for exposure to the process gas. This thermal mass flow inline flow meter is available in sizes from 1/4″ pipe through 4″ pipe or tube and are provided with a variety of options such as MNPT ends, tube end fittings, butt weld ends, flanged end configurations, etc. as necessary. Pipe sizes more than 4″ typically require insertion style thermal mass flow meters.
This integral style inline flow meter has all the electrical components and connections located within one enclosure. Additionally, this enclosure offers ratings for hazardous environments. The enclosure mounts directly to the inline flow section or to the insertion probe assembly at the point of measurement. The enclosure includes all the electrical connections as well as the linearizing electronics and the display / keypad assembly.
Thermal mass flow meters use the principle of convective heat transfer to directly measure mass flow. Furthermore, our proprietary thermal mass flow sensors use two ratiometrically-matched, reference-grade platinum Resistance Temperature Detectors (RTDs). The platinum sensing element wire is encapsulated in a 316 Stainless Steel sheath or, if specified, a Hastelloy C sheath.
In addition, our microcontroller operate with smart sensor technology that preferentially heats one RTD. Meanwhile, the other RTD acts as the temperature reference. The process gas flow dissipates heat from the first RTD, which causes an increase in the power necessary to maintain a balance between the RTDs. As a result, this increase directly relates to the gas molecular rate of flow. Our sensors also feature temperature compensation for a wide process gas temperature range and insensitive to pressure changes. So, the output signal is a true mass flow rate signal.
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