Model 173

SKU: 173

Capacitance Level Transmitter, Loop Powered, Digital Circuitry

The Delta Controls Model 173 Capacitance Level transmits a 4-20 mA direct current signal proportional to the level or volume in a vessel. Model 173 can be programmed for up to 10 fluid elevations to linearize the output signal in irregularly shaped tanks. 173 has built-in self-diagnostic. The potted electronics is capable of handling severe environments in most difficult services.

The 173 is easily calibrated using two levels in the tank. No need to fill or empty the vessel as the second known elevation is acquired by a simple level change.


  • HART® communication protocol compliant
  • 10-point linearization for irregularly shaped tanks
  • Digital RF admittance measuring circuitry
  • Insensitive to process coatings and buildup
  • Simple, two point calibration
  • Reverse calibrated capability
  • Built-in self-diagnostics
  • Integral or remote electronics module
  • Optional corrosion resistant NACE MR-01-75
  • Wide choice of wetted materials including 316 Stainless Steel, PTFE, Alloy 20, PVDF, Monel, and ceramics
  • LCD digital display with 4 key input
  • Threaded, flanged, or bracket probe mounting
  • Epoxy sealed electronics module survives harsh environments and area vibration
  • Built-in voltage spike protection, heavy 12 gauge terminals


  • Level Span: 10 pF min
  • Range: 2000 pF max
  • Zero Suppression: ≤ 2000 pF
  • Output: 4-20 mA, 2-wire, loop powered, isolated ≤ 10 pt linearization
  • Loop Supply Voltage Range: 13 DCV to 35 DCV
  • Loop Impedance: 450 Ω at 24 V max 1000 Ω at 35 V max
  • Ambient Operating Temperature: -20 °F to +175 °F (-29 °C to +79 °C)
  • Accuracy and Stability: ≤ 0.2% of full scale (limited to 0.2 pF)
  • Temperature Effect: 0 °F to +150 °F (-18 °C to 67 °C) < 0.2 in (water)
  • Housings: 4X hose-proof, 6 submergible, Class 1, Division 1, Groups BCD, EFG explosionproof optional
  • Housing Material: Aluminum, PVC, stainless steel
  • Communication: Device menus, HART® Communication Protocol compliant

Certifications & Approvals

  • Housing Option: Third Party Listed by CSA NRTL/C (USA and Canada) Class I, Groups B, C and D; Class II, Groups E, F and G; Class III; Encl 4X

Required Ordering Information

  • Detailed model number
  • Tag or nameplate detail (if required)
  • Documentation & testing packages (if required, refer to Additional Resources in the product catalog)

Additional Information


Capacitance Level Transmitter, Loop Powered, Digital Circuitry

Level Measurement


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