SLA Series Admittance Level Switch

Sapcon’s SLA Series Admittance Level Switch consists of an evaluation unit, an electronic insert and a probe. The probe is mounted either from top or side of the vessel. The probe comprises of sense, shield electrode electrically isolated from the metallic tank by means of suitable insulator. The two electrodes form an imperfect capacitor with the service material as dielectric.

An accurate measurement of change in admittance affords an indirect measure of the level of material in the tank. The electronic insert measures this change accurately by using Radio Frequency (R.F.) technique coupled with coat immunizing circuitry. The change is converted to a DC voltage variation, which is transmitted to the evaluation unit via a 3­core cable for further processing. The processed signal is used to energize or de­energize a relay whose output contacts are available for annunciation and/or control.


CE Marking, RoHS Compliance

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Sapcon Admittance series level switch uses a three element immuno coat technology and uses precision rectifier to eliminate voltage of shield due to build-up of material. The Oscillator generates an AC voltage which drives a current through the capacitance influenced by the product. This AC current is transformed by a precision rectifier in to a DC current which is transmitted to the evaluation instrument and compared with a pre adjusted set value.

The shielded electrode is connected to the minus of the AC voltage, therefore in case adhesion, the current flows from the sensitive measuring part to the shielded electrode and not via precision rectifier. Only the capacitance between the sensitive measuring part and container wall cause a current through the precision rectifier.

  • Ingress Protection of IP-67
  • Coating Immunity specially for sticky and viscous media
  • Universal Supply 90-265 V AC and 24 V DC
  • Available in Integral as well as remote models
  • Customized Mountings and probe lengths
  • Available in High temperature even up to 600°C
Mechanical Specifications

Probe Length

  • Rod Probes:
    • 100mm to 3000mm
  • Rope Probes:
    • 600mm to 12000mm


  • W: Weatherproof
  • P5: IP-65 Weatherproof and Dust-proof
  • FA: Flameproof For Gas Group IIA and IIB


  • Integral Type (Electronics Integral with Probe)
  • Remote Type (Electronics is separated by 3 core ordinary cable)

Process Connection (Mounting Arrangement)

  • Threaded Mounting: 1, 1-1/2”, 2” BSP / NPT
  • Flange Mounting: As per specification
  • Tri-Clover: As per specification


  • PTFE
  • Ceramic

Wetted Parts and Mounting Material

  • S4: SS – 304
  • S6: SS – 316
  • SL: SS – 316L

Process Temperature

  • A (Ambient): below 80°C
  • H1 (High temperature): up to 150°C
  • H2 (High temperature): up to 250°C
  • H3 (High temperature): up to 600°C
Electrical Specifications

Input Power Supply

  •  90-265 V AC, 50 Hz
  • 24 V DC


  •  01 SPDT relay output
  • 02 SPDT relay output
  • 03 SPDT relay output
  • Relay with Time Delay Function
  • PNP output

Pre-amplifier Unit

  •  ICA-3000 for transmission voltage output from Probe to Evaluation unit

Power Consumption

  •  Maximum 5 W

Fail-safe Setting

  • Field selectable (through toggle switch)
  • Open: Fail-safe High, Close: Fail-safe Low

Response Time

  • 0.5 – 2 Sec

Time Delay Settings

  • Cover and Uncover Delay: 0.5 to 20 seconds, field selectable

Sensitivity Setting

  • Field Selectable (through toggle switches)


  • 500 KHz
Application Specifications
  • Food Industries & FMCG
  • Sugar industry
  • Packaging industry
  • Foundry & Castings
  • Soya industry
  • Bulk material handling
  • Flour and rice mills
  • CE Marking
  • ROHS compliance
  • ISI marking for hazardous area
  • Approved by CIMFR for gas groups suitable for IIA, IIB and IIC
Switching Indication
  • 3 LED’s
  • Red: Alarm, Green: Normal, Yellow: Healthy Probe