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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 (0.4 psid loss at max flow) 100 - 500 340 - 1700 800 - 4000 1000 - 5000 lb/hr

Line Pressure

 N/A 18 to 23 psia2 to 25 psia

Sensor Type

 N/A Variable Reluctance

Weight

 N/A Max 60 oz

Wetted Materials

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

Construction

 N/A Bolt-on Venturi/Tube Assy, O-ring Seals, Metallic Diaphragm

Fittings / Ports

 N/A Wiggins W903B16C Tube Connectors

Electrical

Input Voltage

 N/A 20 - 40 VDC

Output Signal

 N/A 0.2 - 5.0 VDC (linear with venturi ΔP)

Power/Current

 N/A Max 10 mA

Electrical Interface

 N/A PT1H-10-6P

Reverse Polarity Protection

 N/A Yes

Isolation

 N/A >100 MΩ @ 100 VDC

Output Impedance

 N/A ≤1000 Ω

Environmental

Compensated Temps

 N/A -38 °F to +135 °F

Vibration

 N/A 20 g pk to 2000 Hz

Shock

 N/A 100 g 11 ms Half Sine

App Media

 N/A JP-4/JET A

Performance

Total Error Band (TEB)2 N/A ±5% FS @ 20% Flow, Decreasing to ±1% FS @ 100% Flow
  • 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.