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FineTek Co., Ltd.
RF-Admittance Level Switch

RF-Admittance Level Switch

Product catalog summary

Product Overview

The FineTek RF-Capacitance / Admittance Level Switch is engineered for accurate level detection across various media including liquids, powders, syrups, and solids. Its specialized probe design—with guard section, upper insulation, main probe, and grounding—minimizes medium adhesion and enhances signal precision by detecting admittance changes when the medium contacts the probe.

Key Features

Adjustable time delay from 0 to 30 seconds for flexible response timing
Durable IP65-rated aluminum alloy housing ensuring protection against dust and water
DPDT relay outputs rated at 5A/250Vac (standard) or 3A/250Vac (explosion-proof)
Selectable high/low level failsafe alarm modes for safety and reliability
Alarm testing and simulation functions for maintenance and verification
Explosion-proof variants certified for hazardous environments (Ex d IIB T6~T1 Gb)
Anti-viscosity probe design reduces medium buildup, maintaining stable operation
Temperature tolerance up to 550°C for super high-temperature models
Applicable to a wide range of media and industries

Applications

Ideal for level monitoring in storage tanks, containers, wells, reservoirs, and bins across diverse sectors such as mining, paint, cement, coal, food processing, flour milling, glass, plastics, breweries, paper manufacturing, power plants, water treatment, tar, and food & beverage industries.

Construction Details

Main probe materials: SUS304 or SUS316 stainless steel for corrosion resistance
Upper insulation and guard section made from low dielectric constant materials PTFE or PEEK
Guard section is a conductive metal probe to eliminate false signals
Lower insulation composed of PTFE for durability
Standard connections include 3/4" NPT or 1" PT threads
Housing features aluminum alloy with spray paint finish and waterproof rubber O-ring sealing
Internal circuitry supports adjustable time delay and failsafe functions

Model Variants and Specifications

Standard Models (SB2100/2110/2120): Operating temperature -40°C to 150°C, DPDT 5A/250Vac output
Hi-Temperature Models (SB2200): Suitable for temperatures up to 232°C
Super Hi-Temperature Models (SB2280): Ceramic insulated probes for extreme temperatures up to 550°C
Cable Models (SB2500): Designed for large tanks and top installations
Mini Models (SB2600): Compact design for limited space or small tanks
Explosion Proof Models (SB17xx series): Certified for hazardous environments with ATEX and PTB approvals, operating up to 450°C

All models feature adjustable time delay (0-30 seconds), high/low failsafe modes, and DPDT relay outputs. Probe materials include SUS304, SUS316, and SUS316L stainless steel. Insulation materials vary (PTFE, PEEK, ceramic) based on temperature requirements.

Electrical and Mechanical Specifications

Supply voltage options: 24Vdc ±20% or 115/230Vac ±10%, 50/60Hz
Maximum power consumption: 2W
Contact ratings: 5A/250Vac (standard), 3A/250Vac (explosion-proof)
Operating pressure: Up to 220 kg/cm² depending on model
Connection types: Multiple thread standards including NPT, PT, BSP, GAS
Probe lengths customizable from under 500mm to over 20 meters

Operation and Calibration

User Controls: Set Point knob (adjusts capacitance sensitivity), Range switch (selects high or low alarm), FSH/FSL switch (selects high/low failsafe mode), Time Delay knob (sets alarm delay 0-30 seconds)
Indicators: Red LED for power, Green LED for alarm status

Failsafe Alarm Modes:

FSH (High Level Failsafe): Alarm triggers when medium reaches high level or during power loss
FSL (Low Level Failsafe): Alarm triggers when medium falls below low level or during power loss

Calibration Procedure: Involves setting the failsafe mode, adjusting alarm range and time delay, and fine-tuning the set point knob while monitoring the alarm LED to ensure accurate level detection.

Ordering Information

Model type selection: Standard, Hi-Temp, Super Hi-Temp, Cable, Mini, Explosion Proof
Connection sizes: 3/4" PT, 1" PT, 1-1/4" PT, among others
Probe length specified in mm or meters, with letter codes for lengths over 10m
Material codes: 0 = SUS304, 6 = SUS316, L = SUS316L
Power supply codes: A/C = 115/230Vac, B/D = 24Vdc with optional analog alarm functions

Additional Notes

Product dimensions and specifications may change; consult local distributors for detailed support
Explosion-proof models comply with PTB and ATEX certifications

Contact Information

FineTek offers global support with offices in Taiwan, China, Singapore, and Germany. Contact details are available for sales and technical inquiries.

Catalog excerpts

RF-Capacitance /Admittance Level Switch

Open the catalog to page 1

PRODUCT INTRODUCTION FEATURES 1 Time delay function from 0-30 seconds 1 IP65 housing protection 1 5 A/250Vac output DPDT 1 High/low failsafe 1 Alarm testing 1 Explosion Proof model available PRODUCT DESCRIPTION RF-Capacitance /Admittance level switch is appropriate for application in liquid and solid mediums. It is designed to reduce medium attaching to the probe. This product also offers DPDT output, high/low level failsafe, adjustable time delay, and sensitivity adjustment. Various models are available for high temperatureerature,or limited space environments. FEATURES 1 Anti-Viscosity 1 Easy...

Open the catalog to page 2

CONSTRUCTION & APPLICATION CONSTRUCTION 1. Main probe: SUS304 or SUS316 2. Upper Insulation: The upper insulated part of the main probe and guard section have very low k die-electric constants and are made of PTFE or PEEK 6. Housing: Aluminum Alloy Spray Paint 7. Wiring Point: ½" PT 8. Waterproof O-Ring: Rubber 9. Circuitry: FSH and FSL, Time Delay Adjustable Function 3. Guard Section: The conductive metal probe helps to dissipate any possible presence of a false signal. 4. Lower Insulation: Due to the low k die-electric constant nature of the main probe, it is comprised of PTFE Storage Tanks,...

Open the catalog to page 3

Dimension (Unit:mm) SB2110 [Standard Model] SB2120 [ Standard L Model] Insulated material High / low Fail safe mode High / low Fail safe mode High / low Fail safe mode Order No. Operating temp. Ambient temp. Housing Probe material Supply voltage Power consumption Contact rating Delay time Fail safe mode Conduit Operation pressure

Open the catalog to page 4

Dimension (Unit:mm) Order No. Operating temp. SB2280 [Super Hi-Temp Model] Insulated material Power Consumption Contact rating High / low Fail safe mode High / low Fail safe mode High / low Fail safe mode Ambient temp. Housing Probe material Supply voltage Delay time Fail safe mode Conduit Operation pressure

Open the catalog to page 5

Dimension (Unit:mm) Order No. Operating temp. SB1711 [Standard Model] SB1712 [ Standard L Model] Insulated material High / low Fail safe mode High / low Fail safe mode High / low Fail safe mode Ambient temp. Housing Probe material Supply voltage Power consumption Contact rating Delay time Fail safe mode Conduit Operation pressure

Open the catalog to page 6

Dimension (Unit:mm) Order No. Operating temp. SB1728 [Super Hi-Temp Model] Insulated material Power consumption Contact rating High / low Fail safe mode High / low Fail safe mode High / low Fail safe mode Ambient temp. Housing Probe material Supply voltage Delay time Fail safe mode Conduit Operation pressure

Open the catalog to page 7

WIRING DIAGRAMS DESCRIPTION OF PANEL FUNCTION DESCRIPTION OF PANEL FUNCTION Set Point: Clockwise, capacitance increases. Red LED: Power indicator. Range: Alarm setting- HI/LOW FSH/FSL switch (High/Low level failsafe) Green LED: Alarm indicator for FSH and FSL. Green LED turns off when alarm goes off. Time Delay: Alarm time delay setting up to 30 seconds. Alarm simulation testing.(SB2!!!Aseries) Relay output. Power: 115/230Vac Set Point: Clockwise, capacitance increases. Red LED: Power indicator. Range: Alarm setting- HI/LOW FSH/FSL switch (High/Low level failsafe) Green LED: Alarm indicator for...

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Probe Length (unit: mm) - ^ Use letters for the code beginning for probelengths over 10m. * Margin of error of the total product length is ± 5mm. * Characteristics, specifications and dimensions are subject to change. * Please contact your nearest distributor for further information.

Open the catalog to page 9

10: Explosion Proof Standard Mod el (1 "PT) 11/12: Explosion Proof Standard Model /Standard LModel(3/4"PT) 20: Explosion Proof Hi-Temperature Model(232°C) 28: Explosion Proof Super Hi-Temperature Model (450°C) 50: Explosion Proof Cable Model 60: Explosion Proof Mini Model Probe Length (unit: mm) - ^ Use letters for the code beginning for probe lengths over 10m. * Margin of error of the total product length is ± 5mm. * Characteristics, specifications and dimensions are subject to change. * Please contact your nearest distributor for further information.

Open the catalog to page 10

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Open the catalog to page 11