Consistently reliable thermal mass flow meters, the Series 8200MPNH provides accessible, safe, and dependable thermal mass monitoring. Delivered in an insertion style thermal mass flow meter configuration, this series includes a sensor and probe assembly that can be inserted directly into the gas flow for precise interpretations. This flow meter is also available in a safe and handy remote style thermal mass flow system that features a unique two enclosure set up. This provides operators with the ability to monitor the thermal mass away from the probe location. The 8200MPNH Series can provide operators with accuracy, safety, and dependability, no matter what the requirements may be.
Master-Touch flow meters provide accurate, consistent, and rapid real-time flow measurement with a sensor that is both temperature and pressure corrective. Each flow meter undergoes calibration using standards traceable to the National Institute of Standards and Technology (NIST).
The Master-Touch 8200MPNH Gen Series, from EPI, includes rugged, cleanable, thermal mass flow sensors. These units consist of a sensor assembly which utilizes two RTD (Resistance Temperature Detector) sensing elements. The sensors are 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. Master-Touch GEN Series thermal mass flow meter enclosures offer ratings for use in ordinary locations. Furthermore, they are applicable in wet and dusty environments and are corrosion resistant.
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. This maintains a reference resistance on one side of a bridge circuit. The temperature sensor and bridge circuitry forces 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.
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″, 3/4″, or 1″ OD probes. 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. Please contact us for other probe diameters and lengths.
Master-Touch remote style thermal mass flow meters utilize two enclosures. One enclosure mounts at the point of measurement on the flow section. This enclosure also offers a rating for non-hazardous environments. Then, the second (remote) enclosure is usually in a readily accessible location with rating for non-hazardous conditions. The remote enclosure includes all the electrical connections as well as the linearizing electronics. Furthermore, it features the display / keypad assembly. A 5-conductor shielded cable is necessary to carry the flow signal between the two enclosures.
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. As a result, 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 also feature temperature compensation for a wide process gas temperature range. They are insensitive to pressure changes, so the output signal is a true mass flow rate signal.
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