Flow Meter for CO2 Measurements


ST100 Series Thermal Flow Meter provides precision CO2 gas mass flow measurement in a highly reliable and fully HazEx agency approved no-moving parts instrument.


The meter can be calibrated to measure CO2 gas and dozens of other specialty gases, as well as the mixed dirty or wet gases common in the EOR separation and re-pressurization applications.  Featuring a sophisticated thermal dispersion technology air/gas flow sensor design with optional pressure measurement, it combines repeatable measurement with feature and function-rich electronics. It provides direct gas mass flow measurement and requires no additional sensors or flow calculating devices.  The instrument’s no-moving parts design also virtually eliminates wear, breakage, and maintenance.


The basic insertion-style meter measures air/gas flow from 0.25 to 1000 SFPS (0.07 NMPS to 305 NMPS) with accuracy of ±0.75%of reading, ±0.5% of full scale.  A wide variety of pressure ranges can be specified from 0 to 1000 psig [0 to 70 bar (g)], depending on the specific model selected to support the most demanding applications.


Users can choose from: 4-20 mA analog, frequency/pulse, or certified digital bus communications such as HART, Foundation Fieldbus, Profibus PA or Modbus RS485.  Should a production field or plant’s communication needs change, a new replaceable card can be swapped out in the field.


Developed with a graphical, multivariable backlit LCD display, the meter brings new meaning to the term “process information”.  Its sophisticated readout continuously displays all process measurements and alarm status for easy on-site viewing by technicians, and it can query for service diagnostics.


The meter’s electronics include a user selectable and programmable data logger. Readings are stored in a removable, internal micro-SD card. The micro-SD card has a 2 GB capacity capable of storing approximately 21 million readings. The recording time base is user selectable with a maximum rate of 1 reading per second. The logging feature is selectable via the front panel menu or via the serial port and configuration software tools.


The meter utilizes constant power thermal mass flow sensing technology that measures flow with 100:1 turndowns in ranges from 0.006 to 1850 SCFM [0.01 to 3140 NCMH]. The transmitter/electronics are integrally mounted with the flow body or can be remote mounted to 1000 feet [305m] away. The transmitter enclosure is NEMA4X/IP67 rated and available in painted aluminum or stainless steel.

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