ValuMass Series 540 is a thermal mass flow meter with insertion installation type which is part of our lower-cost ValuMass Series. Designed with an explosion-proof rated enclosure, it supports many flow applications with the high value associated with all of EPI’s flow measurement instrumentation. Like ValuMass Series 500, the ValuMass Series 540 insertion thermal flow meter uses two ratiometrically-matched Resistance Temperature Detectors (RTDs). This assures that many different gases and gas mixtures are accurately measured.
Besides being temperature compensated, these thermal mass flow sensors are constructed of reference-grade platinum, ceramic, glass, and stainless steel. They are also rugged and insensitive to dirt buildup and slipped into a stainless-steel sheath for corrosion and abrasion resistance. If you are in search of an economical solution for mass measurement in many air and gas flow applications with an insertion installation type, the ValuMass Series 540 insertion thermal flow meter is surely one of your top choices.
The ValuMass Series 540 is 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, and stainless steel. Two platinum resistance sensors are upon a ceramic substrate and then receive a thin glass coating. The assembly then slips into a stainless-steel sheath for corrosion and abrasion resistance.
The sensor assembly is large, rugged, and relatively insensitive to dirt buildup. During operation, the temperature sensor constantly measures the ambient temperature of the gas. It also maintains a reference resistance on one side of a bridge circuit. The temperature sensor and bridge force the second sensor through self-heating to a constant temperature above that of the gas stream. The bridge maintains the overheat temperature and counterbalances the temperature effects through proprietary temperature compensation techniques.
Our ValuMass flow meters, from Eldridge Products Inc. (EPI), provide accurate, consistent, and rapid real-time flow measurement. Furthermore, the sensor is both temperature and pressure corrective. Each flow meter also undergoes calibration using standards traceable to the National Institute of Standards and Technology (NIST).
Insertion style thermal mass flow meters include a sensor & probe assembly that inserts into the process gas flow conduit. This allows the process gas to flow across the flow sensing elements. Our insertion style flow meters are available with 1/2″ OD probes in 6″ to 36″ lengths as well as 3/4″ probes to 60″ lengths. Tube fittings and ball valve retractor assemblies, with or without a mounting flange, are also available from the factory as options. Users must specify the tube length upon ordering.
Integral style ValuMass thermal mass flow meters have all the electrical components and connections within one enclosure. This enclosure also offers a rating for non-hazardous environments. The enclosure mounts directly to the insertion probe assembly at the point of measurement. It 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. Our proprietary thermal mass flow sensors use two ratiometric, reference-grade platinum Resistance Temperature Detectors (RTDs). The platinum sensing element wire is in a 316 Stainless Steel sheath or, if necessary, a Hastelloy C sheath.
Our microcontroller smart sensor technology preferentially heats one RTD. Then the other RTD acts as the temperature reference. The process gas flow dissipates heat from the first RTD. This causes 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 also temperature compensated for a wide process gas temperature range. This makes them insensitive to pressure changes, so the output signal is a true mass flow rate signal.
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