Inline and Insertion Style Thermal Mass Flowmeters

EPI’s Inline style thermal mass flowmeter assembly includes the flow sensing element, temperature sensing element, bridge amplifier/signal output board, transmitter enclosure, and flow section. Both integral and remote electronics configurations are available (see our Integral and Remote Style web page for a discussion of these options). The flow section is typically specified to match the user’s flow conduit and is plumbed directly in the flow line. This design has the sensing elements mounted directly in the flow section for exposure to the process gas.

Our Inline style thermal mass flowmeters are available in sizes from 1/4" pipe through 4" pipe and are provided with threaded male NPT ends as the standard mounting style. Optional end mounting styles may be specified, such as tube ends, tube end fittings, butt weld ends, flanged end configurations, etc. as required. Pipe sizes in excess of 4" require insertion style thermal mass flow meters.

EPI’s Insertion style thermal mass flowmeter assembly includes a sensor probe assembly which is inserted into the process gas flow conduit to allow the process gas to flow across the flow sensing assembly. As with the inline style, both integral and remote electronics configurations are available. The insertion style thermal mass flow meter probe assemblies may be inserted into any suitable flow section, pipe, duct, etc.

Our Insertion style thermal mass flowmeters are available with 1/2", 3/4", or 1" OD probes and may be installed with pipe fitting connections or user-supplied bored through tube fittings. Tube fittings and ball valve retractor assemblies, with or without a mounting flange, are also available from the factory as options. The tube length must be specified upon ordering. Standard lengths range from a minimum of 6" to a maximum of 36". For other probe diameters and lengths, please consult the factory.

Our ball valve retractor assemblies (BVRs) are suitable for use with hot-tap equipment, and they allow the process line to be sealed for continued use if the flowmeter is removed for any purpose. Assemblies are often purchased for permanent installation on different process lines to provide easy access for periodic flow monitoring using Master-Touch insertion style flowmeters with up to 4 calibrated ranges.

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