Approved for use in hazardous locations, the Master-Touch Series 8200MP thermal mass flow meters are extraordinarily dependable and consistent, making them a brilliant addition to your thermal mass monitoring apparatus, particularly when you require complete exactness in diverse thermal environments.
The Series 8200MP has a remote system that provides you with the capacity to monitor the probe readings from non-hazardous, more manageable locations. The Series 8200MP flow meters are a great way to ensure you’re being provided with accurate and foolproof monitoring of your thermal readings. Diverse and always reliable, EPI’s 8200MP series of Flow Meters are a brilliant choice.
The Master-Touch 8200MP HAZ R Series includes a rugged, cleanable, thermal mass flow sensor with remote transmitter. 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 built upon the ceramic substrate and they 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 and maintains a reference resistance on one side of a bridge circuit. The second sensor undergoes self-heating to a constant temperature above that of the gas stream. The temperature sensor and bridge circuitry controls the heating process. Our bridge maintains the overheat temperature and counterbalances the temperature effects through proprietary temperature compensation techniques.
Insertion style thermal mass flow meters include a sensor and probe assembly that inserts into the process gas flow conduit. In doing this, it allows 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. Operators must indicate the tube length upon ordering. For other probe diameters and lengths, please reach out for additional support.
Remote style thermal mass flow meters utilize two enclosures. First, an enclosure mounts at the point of measurement on the probe assembly. This enclosure offers ratings for hazardous environments. The second (remote) enclosure positions in a readily accessible location with non-hazardous conditions. Contact us for information concerning remote explosion-proof enclosure. The remote enclosure includes all the electrical connections as well as the linearizing electronics and the display/keypad assembly. A 5-conductor shield 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. EPI’s 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, 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 temperature compensate for a wide process gas temperature range and are insensitive to pressure changes. Thus, the output signal is a true mass flow rate signal.
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