{"product_id":"valumass-series-540-val-insertion-flow-meters","title":"ValuMass Series 540 VAL Insertion Flow Meters","description":"\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4 style=\"text-align: left;\"\u003eRugged Flow Meters for Gases\u003c\/h4\u003e\n\u003cp\u003e 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 (\u003ca href=\"https:\/\/www.nist.gov\/\" target=\"_blank\" title=\"National Institute of Standards and Technology\" rel=\"noopener\"\u003eNIST\u003c\/a\u003e).\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eaccuracy: ± 1% of reading + 0.5% of full scale + GTC\u003c\/li\u003e\n\u003cli\u003erepeatability: ± 0.2% of full scale\u003c\/li\u003e\n\u003cli\u003esensor response time: 1 second to 63% of final value\u003c\/li\u003e\n\u003cli\u003egas temperature coefficient (GTC): 0.02% full scale\/˚C\u003c\/li\u003e\n\u003cli\u003egas pressure effect: negligible over ± 50% of factory calibration pressure\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2 style=\"text-align: left;\"\u003eValuMass 540 Series Flow Meters\u003c\/h2\u003e\n\u003cp\u003eInsertion style thermal mass flow meters include a sensor \u0026amp; 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.\u003c\/p\u003e\n\u003cp\u003eUsers 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.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2 style=\"text-align: left;\"\u003eEPI Thermal Mass Flow Meters\u003c\/h2\u003e\n\u003cp\u003eThermal 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.\u003c\/p\u003e\n\u003cp\u003eThe 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.\u003c\/p\u003e","brand":"Eldridge Products (EPI)","offers":[{"title":"Default Title","offer_id":45878426140803,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0655\/1955\/0595\/files\/ValuMass-Series-540-VAL-Eldridge-Products-Inc-EPI-Thermal-Mass-Flow-Meter-Insertion-Flow-Meter-Process-Solutions-Texas.png?v=1763386478","url":"https:\/\/www.psctexas.shop\/products\/valumass-series-540-val-insertion-flow-meters","provider":"Process Solutions Corp.","version":"1.0","type":"link"}