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Thermal Dispersion Mass Flow Meter
Thermal Dispersion Mass Flow Meter
Eldridge Products, Inc. has achieved innovation and excellence in thermal dispersion gas mass flow measurement since 1988. With an economical set of features and a number of common configuration and installation choices, our newest ValuMass™ flowmeters continue our tradition of solving flow measurement challenges for customers around the world.
ValuMass™ Series 500 Flowmeters
Eldridge Products, Inc. (EPI) is a proven leader in gas flow measurement. Our Master-Touch™ thermal dispersion gas mass flowmeters and patented Flow Averaging Tubes set the standard for innovation, performance and reliability. Now our Series 500 ValuMass™ flowmeters offer a lower cost option for many flow applications with the high value associated with all of EPI’s flow measurement instrumentation.
The Series 500 ValuMass™ flowmeters include 16-bit linearization technology for excellent flow rate accuracy and rugged construction of 316L stainless steel wetted parts. The robust feature set includes:
- 0 – 5 or 0 – 10 VDC output, flow & temperature
- 4 – 20 mA output, flow & temperature
- Frequency output 0 – 1 kHz proportional flow
- Programmable event relay(s) one 1 amp with frequency out two 1 amp without frequency out
- Protocols – RS232; RS485 Modbus RTU; BACnet
- Optional Protocols – HART, Profibus DP
- Display 2-line, 16-character backlit LCD and 4-button keypad
Our ValuMass™ Series 500 inline and insertion style flowmeters accommodate virtually all common installation requirements. The insertion style flowmeters are available with ½” OD probes in 6” to 36” lengths, ¾” probes to 60” lengths. The inline style flowmeters are available for pipe sizes from ¼” to 2”. The 3 ½” long flow sections have MNPT ends as standard for easy mounting in the process line. ValuMass™ flowmeters accept 24VDC, 115VAC or 230VAC input power as specified at the time of purchase.
EPI’s thermal dispersion flowmeters are solid state instruments that use the principle of convective heat transfer to directly measure gas mass flow. EPI’s sensors consist of two matched reference grade resistance temperature detectors (RTD’s). A microcontroller preferentially heats one sensor; the other sensor acts as a control temperature reference. The gas flow dissipates heat from the heated sensor, in either Constant Temperature Anemometer (CTA) mode for dry-gas operation or Constant Current Anemometer (CCA) mode for wet-gas operation, preset by factory. This heat dissipation is directly related to the gas molecular rate of flow.
Our sensors are temperature compensated and insensitive to pressure changes for direct output readings, so no additional instrumentation or calculations are required. The output signal is a true mass flow rate signal which can be directly interfaced with your data acquisition system.