Are you tasked with monitoring the liquid level in an open water reservoir, river, or in a closed or vented tanking system? Tavis transducers have been providing liquid level measurements for anything from wine fermentation tanks to remote lakes. Flush diaphragm models have been designed to bolt directly onto tank walls. Ported transducers are easily plumbed into manifolds and processing vats. Even submersible styles have been developed to reside directly in the liquid, whether an open water body or a down-hole well. Vent lines can be used to provide atmospheric or ullage pressure reference for very accurate liquid level data. Tavis Technical Bulletin #103 may be of interest to those looking for additional information on tank gauging and liquid level measurement.

High reliability liquid level measurements with Tavis transducers/transmitters have featured:
  • High corrosion resistance stainless steels and Inconels
  • Either 2- and 3-wire current loop (4-20 mA) outputs or 4-wire voltage outputs
  • Submersible configurations with vented reference ports
  • Liquid intrusion into a reference port will not damage the all-metallic welded gage
  • Underwater electrical/data cables
  • Small diameter, down-hole well capability
  • Self-clearing diaphragm ports for clog-free operation
  • Custom mounting provisions
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Unit of Measure
Items
Pressure-Transmitter-10391

Pressure-Transmitter-104XX

Pressure-Transmitter-10477

Pressure-Transmitter-10544
Pressure Range1 N/A 0 - 37 inches H2OD N/A 0 - 0.1 psi to 0 - 6.0 psi 0 - 6.1 psi to 0 - 500 psi N/A 0 - 5 M H2OD to 0 - 40 M H2OD N/A 0 - 1 psi to 0 - 300 psi
Line Pressure N/A 2.25 - 17.18 psia N/A 0 - 350 psi (for =10 psi full scale) 0-800 psi (for >10 psi full scale) Line pressure will affect zero and span accuracy N/A N/A
Proof Pressure N/A 75 psig N/A 200% FS or 20 psi, whichever is greater N/A 200% FS N/A 150% FS or 15 psi, whichever is greater
Burst Pressure N/A 125 psig N/A N/A 500% FS N/A
Sensor Type N/A Variable Reluctance
Weight N/A 32 oz Max N/A 25 oz Nominal N/A 35 oz Nominal N/A 10 oz Max (without cable)
Wetted Materials N/A 17-4 PH SST N/A 17-4 PH SST N/A 17-4 PH SST 321 CRES N/A 304L CRES Delrin Inconel 625 Urethane
Construction N/A Differential (Ullage) Reference Tube, TIG Welded 17-4 PH SST Flush Diaphragm with Integral Flange N/A Anodized Aluminum Base and Cover, 17-4 PH SST Gage (Absolute, Differential, Gage) N/A TIG Welded Gage/Case, Brazed Vent Port Tube, Flush Diaphragm with Threaded Base Mounting Plate N/A 1-inch O.D Max, TIG Welded Gage/Case, Urethane Cable with Integral Vent Tube
Fittings / Ports N/A N/A - Flush Diaphragm with Flange N/A Female 1/8 - 27 NPT N/A 7/16 - 20 UNF-2B per SAE/MS 16142 Vent Port, Flush Diaphragm with Slots at Base N/A Flush Diaphragm with Perforated Nose End
Input Voltage N/A 20.5 - 32.2 VDC N/A 16 - 50 VDC N/A 8 - 16 VDC N/A 20 - 40 VDC
Output Signal N/A 0.5 - 5.5 VDC N/A 0 - 10 VDC N/A SDI-12 RS-232 Analog Possible N/A 4 - 20 mA
Power/Current N/A 20 mA Max N/A 3.5 mA Nominal N/A 1 - 35 mA (Digital) N/A 4 - 20 mA
Electrical Interface N/A MIL-C-26482/MSFC 40M39569 (10-6) N/A Bendix PT02A8-4P N/A Seacon LMG-4-BCL Underwater or Equivalent N/A 2-wire urethane cable with integral vent tube - various lengths
Reverse Polarity Protection N/A Yes N/A No N/A No N/A No
Insulation N/A >100 MΩ @ 50 VDC N/A >100 MΩ @ 50 VDC N/A >50 MΩ @ 50 VDC N/A >50 MΩ @ 50 VDC
Output Impedance N/A 1000 Ω Max N/A 100 Ω Max N/A N/A
Compensated Temps N/A 32 °F to +110 °F (-65 °F to +165 °F Operating) N/A 30 °F to +130 °F (-65 °F to +225 °F Operating) N/A 0 °C to +50 °C N/A 0 °F to +120 °F
Vibration N/A N/A N/A 2 g @ 10 - 45 Hz .02 in @ 45 - 100 Hz 10 g @ 100 - 1000 Hz N/A
Shock N/A 10 g 11 ms Half Sine N/A N/A 100 g 11 ms Half Sine N/A 20 g 11 ms Half Sine
App Media N/A Waste Water N/A Non-Corrosive Liquids or Gases, Bubbler Applications N/A Fresh Water Sea Water N/A Fresh Water
Static Error Band2 N/A ±1.0% FSO Max N/A ±0.3% FSO Max N/A N/A ±0.3% FSO
Thermal Error2 N/A ±2.0% FSO Max N/A ±2.0% FSO Max N/A N/A
Total Error Band (TEB)2 N/A N/A N/A ±0.1% FSO Max (Digital) N/A ±1.5% FSO
Frequency Response3 N/A N/A N/A 5 s (Digital) N/A
  • 1 The designs above are intended to convey just a few capabilities previously used in liquid level monitoring for discussion purposes. Tavis specializes in custom configurations and capabilities for your specific application. Discuss your liquid level requirements with our engineers for your specific application.
  • 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.
  • 3 Frequency Response given is for electronics only. Actual frequency response will depend on pressure range and media.