ValuMass™ 500 Inline Thermal Mass Flow Meter

Series 5xx ValuMass™ flow meters offer a lower cost option for many flow applications with the high value associated with all of EPI’s flow measurement instrumentation.

This series meter includes an industrial explosion proof enclosure. (CE Mark)


Below shows the inline integral enclosure.

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Remote feature option comes with the remote enclosure and mounting bracket. Cable from the flow element transmitter to the remote enclosure enters at the bottom of the bracket piping.

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Series 5xx ValuMass Flowmeters

The 500 ValuMass™ flow meters 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:

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

Our ValuMass™ inline style flow meters accommodate virtually all common installation requirements.  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™ flow meters accept 24VDC, 115VAC or 230VAC input power as specified at the time of purchase.

Thermal Technology

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 re­sistance temperature detectors (RTDs). A digital bridge preferentially heats one RTD; the other RTD acts as the temperature reference. The gas flow dissipates heat from the first RTD, causing an increase in the power re­quired to maintain a balance between the RTDs. This in­crease is directly related to the gas molecular rate of flow.

Our sensors are temperature compensated and insensitive to pressure changes, 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.


CE Mark

Accuracy, including linearity (Ref.: 21°C)
±(1% of Reading + 0.5% of Full Scale + GTC)

± 0.2% of Full Scale

Linear Signal Output
0 – 5 or 0 – 10VDC, 4 – 20 mA, RS485 Modbus RTU
0 – 1 kHz (proportional to flow for total/counter)

Sensor response time
1 second to 63% of final value

Turn down ratio
100:1 @ 15 SFPM (.076 NMPS) 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
-40°–392°F (-40°–200°C)

Pressure Rating Maximum:
Inline Flowmeters
500 PSIG
Insertion Flowmeters
500 PSIG (Stainless Steel ferrule)
25 PSIG (Teflon™ ferrule), 250 PSIG with Locking collar & safety cable.

Input Power Requirement
24 VDC @ 250mA
115 VAC 50/60 Hz 100mA optional
230 VAC 50/60 Hz 50mA optional

Transmitter Power Requirements
5 Watts or less

Relay Output Rating
1 Amp @ 30VDC (33W) (2 Relays, 1 if Freq. Out needed)

RS-232C, RS485 Modbus RTU, Optional HART or Profibus DP

Optional 2-line, 16-character backlit LCD and 4-button keypad

Wetted Materials
316 & 316L Stainless Steel

Standard Temperature & Pressure (STP)
70°F & 29.92″ Hg
(Air = 0.075 Lbs. / FT3)

NIST Traceable Calibration

Enclosure Rating
NEMA 4X (IP66)

NOTE: Specifications subject to change without notice. 

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