Compact Mass & Insertion Stainless Steel Flow Meters

Eldridge Products, Inc. (EPI) is a proven leader in gas flow measurement. Our Master-Touch™ thermal dispersion gas mass flow meters and patented Flow Averaging Tubes set the standard for innovation, performance and reliability. Our ValuMass™ Series 500 flow meters enjoyed a successful introduction into the marketplace, and now our compact Series 400 offer another lower cost option for many flow applications with the high value associated with all of EPI’s flow measurement instrumentation.

ValuMass™ Flowmeters: Series 400

The Series 400 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
  • a programmable dry contact Relay for alarms or pulsed output totalization

ValuMass™ inline and insertion flowmeters accommodate virtually all installation requirements. The Series 400 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. Other end fittings are available. The Series 440 insertion style flowmeters are available with 6”, 12” or 18” long probes which include a compression fitting. Other mounting options are available. ValuMass™ flowmeters accept 24VDC, 115VAC or 230VAC input power as specified at the time of purchase.

The ValuMass™ Series 400 is CE compliant.


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 @ 30VDC (33W) (2 Relays, 1 if Freq. Out needed)
Signal Interface RS232C, RS485 Modbus RTU
Display 2-line, 16-character backlit LCD
optional no display
Accuracy including linearity (Ref.: 21°C): ± (1% of Reading + (0.5% + .05%/°C of Full Scale))
Repeatability ± 0.2% 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 500 PSI (Stainless Steel ferrule)
25 PSIG (Teflon™ ferrule), 250 PSIG with Locking collar & safety cable.
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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