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In addition to our customers making ΔP measurements across an orifice with our differential transducers, Tavis makes very accurate flow sensors with integral venturi tubes. In fact, the Space Station is chock full of Tavis flowmeters for environmental control and life support systems. Our Variable Reluctance technique and construction allow for very high line pressures even with low flow rates. Some of our more customized flowmeters have dual flow range capability.





Tavis Venturi flowmeters are used in applications with characteristics such as:
  • Custom venturi designs for specific flow requirements
  • Dual gage low/high flow rates
  • High line pressure
  • Output signal linear with either pressure or flow
  • No rotating/moving parts
  • Continuous analog output; flow is not sampled or digitized
  • Weld-mount, flange-mount, fitting-mount interface with system plumbing
  • 4 - 20 mA and 0/1-5 VDC outputs
Unit of Measure

General

Flow Range1 N/A (1.1 psid loss at max flow) 500 - 1876 lb/hr1180 - 3100 lb/hr

Line Pressure

 N/A 10 to 110 psia

Line Proof Pressure

 N/A >172 psig

Line Burst Pressure

 N/A >200 psig

Sensor Type

 N/A Variable Reluctance

Weight

 N/A Max 4.20 lb

Wetted Materials

 N/A 17-4 PH SST 304L/321 CRES Inconel 600/625

Construction

 N/A TIG Welded Gage/Venturi Assy, Custom Flange Mount

Fittings / Ports

 N/A .90" DIA Inlet/Exit w/Custom Flange Mount

Electrical

Input Voltage

 N/A Dual Input 15 VDC (each flow circuit)

Output Signal

 N/A Dual Output : 4 - 20 mA (each flow circuit linear with venturi ΔP)

Power/Current

 N/A 23 mA Max (each flow circuit)

Electrical Interface

 N/A NATC09Y11P35PB 13-Pin

Reverse Polarity Protection

 N/A Yes

Environmental

EMI

 N/A capacitor filter per flow circuit

Compensated Temps

 N/A 33 °F to +122 °F (Fluid) -67 °F to +200 °F (Non-Operating)

Vibration

 N/A 4.4 grms

App Media

 N/A Water

Performance

Total Error Band (TEB)2 N/A ±5% of Flow Rdg
  • 1 The designs above are intended to convey just a few capabilities previously used in critical flow systems for discussion purposes. Tavis specializes in custom configurations and capabilities for your specific application. Discuss your flow system requirements with our engineers for your specific flow control needs.
  • 2 Many error band definitions and limits are possible, and these actual error bands are too specific to delineate herein. A clear definition and understanding of any error band is critical, and many manufacturers’ published errors or accuracies can be very misleading. Please consult Tavis regarding your specific error band requirements.