Thermal Dispersion & Duct Gas Flow Meters

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 ValuMass™ Series 500 flow meters 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 316/316L stainless steel wetted parts. The robust feature set includes:

  • a 0 – 5 or 0 – 10 VDC output
  • a 4 – 20mA output
  • RS485 Modbus RTU communications
  • a 0 – 1 kHz output proportional flow
  • an RS232C port
  • a 2-line, 16-character backlit LCD and 4-button keypad
  • a programmable dry contact Relay for alarms or pulsed output totalization

Our ValuMass™ inline and insertion style thermal dispersion flow meters accommodate virtually all common installation requirements. The insertion style flow meters are available with ½” OD probes in 6”, 12” or 18” lengths and a compression fitting is included with all insertion style flowmeters. The inline style flow meters are available for line 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.

Now you can have the accuracy and reliability of an Eldridge Products' thermal mass flow meter for applications that don't require the full feature set of the Master-Touch™ product line.

The ValuMass™ Series 500 is CE compliant.

Specifications for Thermal Dispersion Flow Meters

Linear signal output 0–5 or 0–10 VDC, 4–20 mA
0–1 kHz proportional to flow (for total/counter)
Relay Output 1 Amp @ 30 VDC (33W)
Signal Interface RS232C, RS485 Modbus RTU
Display 2-line, 16-character backlit LCD with 4-button keypad
optional no display
Accuracy including linearity (Ref.: 21°C): ± (2% of Reading + (0.5% + .05%/°C of Full Scale))
Repeatability ± 0.5% of Full Scale
Sensor response time 1 second (time constant per step change)
Turn down ratio 100:1 @ 15 SFPM (.076 NMS) Minimum Reading
Electronics PCB temperature range -40° to 158°F (-40° to +70°C)
Environmental temperature range -40° to 140°F (-40° to +60°C)
Gas temperature range Standard 0°–150°F (-18°to 66°C)
Optional -40° to 392°F (-40° to 200°C)
Gas temperature effect 0.02% /°C
Gas pressure effect Negligible over ±20% of absolute calibration pressure
Pressure rating maximum:  
Inline flow meters 500 PSI
Insertion flow meters 225 PSI (Stainless Steel ferrule)
25 PSI (Teflon™ ferrule)
Input power requirement 24 VDC @ 250mA
optional 115 VAC 50/60 Hz 100mA
optional 230 VAC 50/60 Hz 50mA
Transmitter power requirements 5 Watts or less
RAM back-up Lithium Battery, 2.5–3.5v, >10 years
Wetted materials 316SS, including sensor
Standard temperature & pressure (STP) 70° F & 29.92" Hg
(Air .075 lb/cubic foot)
NIST traceable calibration Standard
Enclosure rating NEMA 4X (IP66)
Approval CE Mark

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