RF Admittance Level Switch / Transmitter

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RF Admittance Level Switch / Transmitter

Radio Frequency Admittance (RFA) level detectors are an advanced evolution of capacitive level technology, using a probe and vessel wall as capacitor electrodes to detect changes in the medium; by measuring admittance variations via high-frequency radio waves—and incorporating an oscillator buffer and AC chopper driver—they effectively mitigate material buildup (“coating”) on sensors; featuring a modular design with primary and guard electrodes, they simultaneously measure combined changes in capacitance, resistance, and inductance, offering anti-coating and anti-interference capabilities, with a probe temperature range of –20 °C to 200 °C, IP66 protection, and support for vertical or split-type installation, making them suitable for liquids, slurries, powders, and granular materials in chemical, power, metallurgy, and food industries—including applications in oil, cement, and grain storage.

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technology parameter

Structure Form	Integrated, Split	Connection Method	Screw Type, Flange Type, Insertion Type
Shell Material	SUS304, SUS316, Aluminum Alloy	Electrode Form	Flat Type, Flexible Probe, Corrosion Resistant Type
Probe Material	304, 316L, PTFE, Rubber	Ambient Temperature	-25 ～ 60℃
Process Temperature	-30 ～ 1300℃	Applicable Pressure	0～1.6 MPa (can be agreed upon)
Precision	±0.5mm	Electrical Interface	M20×1.5 (can be agreed upon)
Output Method	4～20mA, Relay	Protection Class	IP66,
Certification	Intrinsic Safety, Flameproof	Power Voltage	220VAC, 24VDC

Selection

Measurement Task
Operating Temperature

A:≤80℃; B:≤120℃; C:≤200℃; D:≤300℃; E:≤400℃;
Pressure Rating

A:0–1.6MPa; B:0–2.5MPa; C:0–4.0MPa; D:0–6.3MPa; E:0–10MPa;
Output Signal

A:4–20mA; B:Discrete signal; C:No Output;
Power Supply

A:24VDC; B:220VAC; C:Non-powered;
Process Connection Size

A:DN20; B:DN25; C:DN32; D:DN40; E:DN50; F:DN65; G:DN80; H:DN100; J:DN125; K:DN150; L:DN200; M:G1/2 thread; S:1/2 NPT thread; T:G1 thread; Y:G1½ thread; Z:G1¼ thread; X:Other;
Insertion Length

A:0-100mm; B:0-200mm; C:0-300mm; D:0-400mm; E:0-500mm; F:0-600mm; G:0-700mm; H:0-800mm; I:0-900mm; J:0-1000mm; K:0-1200mm; L:0-1500mm; M:0-2000mm; N:0-3000mm; O:0-4000mm; P:0-5000mm;
Protection Tube Outer Diameter

A:10mm; B:12mm; C:14mm; D:16mm; E:Customized;
Explosion-Proof Rating

A:Standard; B:EX Explosion-proof; C:EX Intrinsically Safe;
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