Guiyang.bai@honno-auto. com
86-13840589744
Stainless-steel magnetostrictive level sensor, 0.05/0.1 mm resolution, 25–2500 mm, 4–20 mA / RS485, M50 thread or flange, IP67; for non-corrosive water and oil.
The HNL30-A magnetostrictive level sensor provides high-precision continuous level measurement in a stainless-steel construction. A built-in magnet float tracks the level along the rod; resolution is 0.05 / 0.1 mm, with current, voltage or RS485 communication interfaces to match the control system. It is intended for non-corrosive water, oil and general process liquids.
The sensor suits non-corrosive liquid storage tanks, water and oil tanks, hydraulic and lubrication reservoirs, general process vessels, narrow tanks and columns, laboratory and pilot-plant vessels, and OEM equipment requiring continuous high-resolution level indication. For strong acid and alkali media, use the PFA anti-corrosion HNL30-B version.
Good fit: non-corrosive water and oil tanks, hydraulic and lubrication reservoirs, general process vessels, narrow tanks and columns, laboratory and pilot plant vessels, OEM continuous level measurement, storage and process tanks with neutral liquids.
Choose HNL30-A when:
You need continuous, high-resolution level measurement (0.05 / 0.1 mm) in a stainless-steel vessel or tank.
The medium is water, oil or another non-corrosive liquid compatible with stainless steel.
Range is within 25…2500 mm, and the control system accepts 4…20 mA, voltage output or RS485.
Confirm with us first when: the medium is strongly acidic or alkaline (choose HNL30-B PFA instead), contains heavy solids or sludge that can bind the float, the range exceeds 2500 mm, the tank is pressurized beyond the connection rating, or you need a certified explosion-proof instrument.
A float with a built-in magnet rides the rod; the magnetostrictive element measures the float position. Non-linearity ±0.1 mm (≤400 mm) or 0.05% F.S. (>400 mm); repeatability ±0.1 mm; update time 1 ms (four-wire) or 100 ms (two-wire). The magnetic ring speed is optional.
The HNL30-A uses a stainless-steel level-gauge construction with a stainless rod and magnet float. Upper and lower blind spots vary slightly with liquid density.
Output 4…20 mA or 20…4 mA (load 0/500 Ω), 0–10 VDC or 0–5 VDC (minimum load ≥10 kΩ), or RS485. M12 aviation socket connection; M50 thread or movable threadless flange mounting, any orientation. IP67, operating temperature –40…+75 °C, humidity 90% non-condensing.
| Model | HNL30-A — Stainless-steel magnetostrictive liquid level sensor |
|---|---|
| Measuring principle | Magnetostrictive element with built-in magnet float; continuous level position |
| Measuring range | 25…2500 mm, customized to requirement |
| Resolution | ±0.1 mm (range ≤400 mm); range ÷ 4096 (range >400 mm); 0.05 / 0.1 mm resolution |
| Non-linearity | ±0.1 mm (≤400 mm) or 0.05% F.S. (>400 mm) |
| Repeatability | ±0.1 mm |
| Update time | 1 ms (four-wire) / 100 ms (two-wire) |
| Current output | 4…20 mA or 20…4 mA; minimum / maximum load 0 / 500 Ω |
| Voltage output | 0–10 VDC or 0–5 VDC; minimum load resistance ≥10 kΩ |
| Input voltage | +24 VDC ±20% or +12 VDC ±20% |
| Power consumption | <80 mA |
| Protection | Polarity protection max –30 VDC; overvoltage protection max 36 VDC; insulation resistance >10 MΩ; dielectric strength 500 V |
| Construction | Stainless-steel level gauge; rod and built-in magnet float |
| Connection | Aviation socket, M12 connector |
| Mounting | Any direction; M50 thread or movable threadless flange |
| Protection rating | IP67 |
| Operating temperature | –40 °C to +75 °C |
| Humidity | 90% non-condensing |
| Shock / vibration | 50 g, 6 ms (GB/T 2423.5); 15 g, 10…2000 Hz (GB/T 2423.10) |
| EMC | ESD, RF radiated, EFT, conducted RF and power-frequency magnetic field immunity per GB/T 17626 series, Levels 2–3 |
| Pin | Color | Function |
|---|---|---|
| 1 | Brown | +24 VDC ±20% power supply |
| 2 | White | 0 V power circuit |
| 3 | Blue | Signal + |
| 4 | Black | Signal − |
| 5 | Grey | Shielding wire |
| Code segment | Code | Description |
|---|---|---|
| Measuring range | – | L = xx mm (four digits, leading zeros) |
| Temperature measurement | 1 | Yes |
| 2 | No | |
| Installation | F | Threadless flange installation (M50 thread otherwise) |
| Cable length | – | Two digits, leading zeros; 05 = 5 m |
| Output signal | M | Current output 4…20 mA |
| R | RS485 |
Rod-mounted stainless-steel sensor with M12×1 head and magnet float. Upper blind spot varies with liquid density; a lower blind spot is noted on the drawing. Rod length matches the ordered range.
Mount through the M50 thread or threadless flange so the float travels freely along the rod, clear of the tank wall, heating element and internal fittings. Keep the rod vertical or within the allowed mounting orientation. Confirm the stainless-steel wetted parts are compatible with the medium and concentration. Route the M12 cable away from vibration and high-temperature surfaces, and connect the grey shield to protective earth per the system layout.
Water and oil tanks: continuous level in storage and day tanks with non-corrosive liquids.
Hydraulic and lubrication: reservoir level indication and pump protection.
General process: vessels, narrow columns and pilot plants requiring high-resolution level.
OEM equipment: continuous level monitoring in machines and compact skids.
Send: medium and temperature, tank material and available opening, required range, output preference (4…20 mA / voltage / RS485), whether temperature measurement is required, cable length, and control-system input. We will confirm the mounting and selection code before quoting.
How accurately does magnetostrictive sensing track continuous tank level without contact wear?
The magnetostrictive element tracks the magnetic float with ±0.1 mm non-linearity and ±0.1 mm repeatability; there is no sliding electrical contact to wear out, which suits continuous level duty.
Does surface foam interfere with the magnetic float position?
The measurement responds to the magnet float position, so stable foam above the liquid generally does not shift the reading. Heavy foam, sludge or coating that restrains the float should be avoided; keep the float path clear.
Which output best supports remote tank level control?
4…20 mA is the standard choice for remote analog level control over longer lines; RS485 suits multi-drop digital monitoring; 0–10 V / 0–5 V suits local analog controllers. Match the load to the stated minimum load resistance.
What mounting clearance prevents the float contacting tank internals?
Leave clearance around the rod so the float does not touch the wall, heating element, baffle or fittings, and account for the upper and lower blind spots when setting the readable level range.
Which version should I choose for acidic or alkaline liquid?
For strong acid and alkali media, use the PFA anti-corrosion HNL30-B version instead of this stainless-steel HNL30-A.
Send us the medium, range and opening. We will confirm the mounting, output and selection code before we quote.
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Contact: HongNuo
Phone: 13840589744
Tel: 86-13840589744
Email: Guiyang.bai@honno-auto. com
Add: Zhongguancun Innovation Center, No. 28 Huahai Road, Shenyang Economic and Technological Development Zone, Liaoning Province
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