SGL-RF10 is a continuous level sensor that ignores probe coating: it measures capacitance and resistance at the same time, so glue, resin or heavy oil sticking to the probe does not read as level. Range 50–1000 mm, 9–36 VDC supply, 0.5–4.5 VDC or RS485 (Modbus) output, FEP probe, G1 thread, 2.5 MPa, IP65.
Product illustration (vector drawing, not a photo): display head, G1 thread, FEP probe
SEGMENsensor SGL-RF10 is an RF admittance level sensor for continuous level measurement of viscous liquids, oils and water. It measures the capacitive and resistive components together, eliminating the error caused by probe coating, and outputs 0.5–4.5 VDC or RS485 Modbus over a 50–1000 mm range.
An RF admittance level sensor is a capacitive-type level sensor that solves the probe-coating problem. Admittance is the reciprocal of impedance; because inductance in a real measuring circuit is very small, admittance here effectively means capacitance and resistance. By measuring both at the same time, the sensor separates material stuck to the probe from the true liquid level. RF admittance technology typically uses an RF signal at a suitable frequency between 15 and 400 kHz.
The SGL-RF10 converts the level change into a 0.5–4.5 VDC analog signal or an RS485 Modbus output. Push buttons on the head set the range and calibrate zero and full scale (calibration by command is also possible), and the display shows the level on site. With no moving or elastic parts and a dedicated ASIC, MTBF is up to 60,000 h.
Updated 2026-11-04 · Values from the SGL-RF10 datasheet, Rev A (2026-11).
All values from the SGL-RF10 datasheet. Download the datasheet (PDF, 4 pages, no registration) — specifications, pin assignment, dimensions, cable codes, wiring and installation.
| Parameter | Value |
|---|---|
| Measurement | |
| Application media | Viscous liquids, water, oils, liquid chemicals |
| Measuring range | 50–1000 mm |
| Resolution | 1 mm |
| Accuracy | Water (dielectric constant ≥ 25) ±2% FS; oil (≥ 5) ±4% FS; glue (< 5) ±5% FS |
| Repeatability | < ±1% FS |
| Temperature coefficient | < 0.05%/°C |
| Electrical | |
| Supply voltage | 9–36 VDC |
| Output signal | 0.5–4.5 VDC analog / RS485 (Modbus) |
| Load capacity | ≤ 20 mA |
| Connection | M12 connector (5-pin) |
| Environment & construction | |
| Operating temperature | Integral version -40 to 85 °C; remote probe -55 to 200 °C |
| Storage temperature | -40 to 100 °C |
| Rated working pressure | 2.5 MPa |
| Probe surface material | FEP |
| Process connection | G1 thread |
| Protection class | IP65 |
The same sensor gives a different accuracy class on different media. A higher dielectric constant gives a stronger signal and better accuracy.
| Medium | Dielectric constant | Accuracy | Example on a 1000 mm range (calculated) |
|---|---|---|---|
| Water | ≥ 25 | ±2% FS | ±20 mm |
| Oil | ≥ 5 | ±4% FS | ±40 mm |
| Glue | < 5 | ±5% FS | ±50 mm |
| If your application… | Then |
|---|---|
| runs above 85 °C or below -40 °C | choose the remote (split) version — probe -55 to 200 °C |
| needs more than 1000 mm range, more than 2.5 MPa, or another output signal | tell us in the RFQ; it is evaluated per project |
| needs only a high / low alarm point | see float level switches |
Typical applications: automatic dispensing machines (glue bucket level), petrochemical storage tanks and construction vehicles (oil tank level). Suitable media: oils, heavy oil, alcohol, glue, resin, liquid chemicals, jam, syrup, dairy and other viscous liquids, and water.
SGL-RF10 uses an M12 5-pin connector: pin 1 (brown) is +V 9–36 VDC, pin 4 (black) is −V (GND), pin 5 (grey) is the voltage output VOUT, and pins 3 (blue) and 2 (white) are RS485 A and B.
| M12 pin | Wire colour | Function |
|---|---|---|
| 1 | Brown | +V (9–36 VDC) |
| 2 | White | RS485_B |
| 3 | Blue | RS485_A |
| 4 | Black | −V (GND) |
| 5 | Grey | VOUT voltage output (range settable within 0–10 VDC) |
Wire colours refer to the matching SGA series cables.
| Dimension | Value (mm) |
|---|---|
| Bottom dead zone | 5 |
| Top dead zone | 28 |
| Thread length | 20.3 |
| Probe diameter | Ø11 |
| Head diameter | Ø45 |
| Hex | SW45 |
| Thread | G1 (55°, 11 TPI, pitch 2.309) |
Cables are accessories and are ordered separately. All are M12 5-pin, PUR jacket, Ø6 cable.
| Order code | Type | Cable length |
|---|---|---|
| SGA-M12F-02 | Female, open end | 2 m |
| SGA-M12F-05 | Female, open end | 5 m |
| SGA-M12F-10 | Female, open end | 10 m |
| SGA-M12FF-02 | Female – female | 2 m |
| SGA-M12FF-05 | Female – female | 5 m |
| SGA-M12FF-10 | Female – female | 10 m |
| SGA-M12FM-02 | Female – male (extension) | 2 m |
| SGA-M12FM-05 | Female – male (extension) | 5 m |
| SGA-M12FM-10 | Female – male (extension) | 10 m |
| Item | Please specify / options |
|---|---|
| Medium | Name or dielectric constant (sets the accuracy class) |
| Effective range L | 50–1000 mm |
| Version | Integral (-40 to 85 °C) or remote (probe -55 to 200 °C) |
| Output | 0.5–4.5 VDC analog or RS485 (Modbus) |
| Mounting and cable | G1 thread or flange (flange size confirmed with the order); cable code from the table above |
Ordering example: SGL-RF10, integral version, effective range L = 500 mm, RS485 (Modbus) output, G1 thread; cable SGA-M12F-05.
Send the medium, range, version and output — an engineer replies within 24 hours on working days with a quotation and the datasheet.
Tell us your specification — our engineers reply within 24 hours.