The ValuMass Series 500 is a part of the low cost ValuMass series, which offers a design for many flow applications and features an inline installation type. Available in pipe sizes from 1/4″ pipe through 2″, it includes an explosion-proof enclosure for use in applications in hazardous areas. The ValuMass Series achieves utmost durability, continuous measurements, resistance, as well as easy maintenance. Furthermore, this thermal mass flow meter includes rugged and cleanable thermal mass flow sensors made of platinum, ceramic, glass, or stainless steel, but also features a stainless-steel sheath which enables corrosion and abrasion resistance.
ValuMass 500 VAL flow meters provide 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), is undergoes calibration using standards traceable to the National Institute of Standards and Technology (NIST).
Like the ValuMass Series 540, the ValuMass Series 500 inline thermal mass flowmeter also uses the proprietary temperature compensation techniques using two RTD (resistance temperature detectors). This design allows the ValuMass Series to deliver accurate measurements day in, day out. If you require reliable mass measurement for an air and gas flow application with an inline installation, the ValuMass Series 500 is an excellent choice that provides great value at a great price.
ValuMass 500 Series VAL is a rugged, cleanable, thermal mass flow sensor. These flow meters consist of a sensor assembly that utilizes two RTD (Resistance Temperature Detector) sensing elements. The sensors are constructed of reference grade platinum, ceramic, glass, and stainless steel. Two platinum resistance sensors rely upon a ceramic substrate that then receives 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 as well as 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. In addition, it is controlled by the temperature sensor and bridge circuitry. Our bridge maintains the overheat temperature and counterbalances the temperature effects through our proprietary temperature compensation techniques.
Our inline style thermal mass flow meters include a flow section that matches the user’s flow conduit and then usually plumbs directly into the process line. Furthermore, the sensing elements 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 2.5″ pipe. The 3.5″ long flow sections have MNPT ends as standard for easy mounting in the process line (options available for pipe sizes over 2.5″).
Integral style thermal mass flow meters have all the electrical components and connections within one enclosure. This enclosure features a rating for non-hazardous environments. Then the enclosure mounts directly to the inline flow section 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 from Eldridge Products use the principle of convective heat transfer to directly measure mass flow. 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.
Our microcontroller smart sensor technology preferentially heats one RTD. Meanwhile, the other RTD acts as the temperature reference. The process gas flow dissipates heat from the first RTD, causing an increase in the power necessary to maintain a balance between the RTDs. This increase directly relates to the gas molecular rate of flow. Our sensors are temperature compensated 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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