Guiyang.bai@honno-auto. com
86-13840589744
Magnetostrictive level sensor with absolute position output for hydraulic cylinders. 50–2500 mm, ±0.01% FS, position + speed, SSI / CANbus, up to 105 ℃.
The HNL80-A magnetostrictive level and displacement sensor is designed for built-in installation in hydraulic oil cylinders, giving a sturdy, reliable position and level measurement in harsh industrial service. Absolute position output needs no reset to zero after power-up; non-contact measurement never wears because the position magnet does not touch the measuring rod. Multi-magnetic-ring position detection monitors several positions on one rod, and the sensor supports position + speed dual signal output.
Suited to hydraulic cylinders and oil cylinders, wind power generation, metallurgical coking, marine equipment and shipbuilding, shield tunnelling equipment, injection moulding machines, die-casting machines, steel mills and heavy industry, port and construction machinery, offshore and oil and gas, hydropower and energy equipment, machine control, and level measurement in hydraulic reservoirs and tanks.
Good fit: hydraulic and oil cylinders, wind power, metallurgical coking, marine and shipbuilding, shield tunnelling, injection moulding and die-casting, steel mills and heavy industry, port and construction machinery, offshore and oil & gas, hydropower and energy, machine control, hydraulic reservoir level.
Choose HNL80-A when:
You need an embedded cylinder position or level sensor with absolute, wear-free feedback and no zero reset after power interruption.
One rod must detect several magnetic ring positions, or position and speed must be output together.
You need analog or bus output (SSI, Start/Stop, Profibus-DP, CANbus, Profinet) to integrate directly into the machine controller.
Confirm with us first when: the required range exceeds the selected version limit, the hydraulic oil temperature exceeds the heat-resistant rating, the rod diameter or thread does not match the cylinder bore, or an explosion-proof version is required.
The sensor mounting flange is integrated with the oil cylinder. If the sensor fails, only two fixing screws are removed to replace the electronic compartment, and the cylinder stays pressurized. The flexible replacement core suits narrow installation spaces; a dual-color LED gives real-time status indication for easy diagnosis.
The position magnet travels along the rod without touching it, so there is no mechanical wear. The easy-to-disassemble design and split replacement core keep service simple in cramped cylinder bores.
Temperature-resistant design rated up to 105 ℃, with 304L sensor head and pressure-resistant outer tube and a Viton 75 fluororubber sealing ring.
| Model | HNL80-A — Magnetostrictive level / displacement sensor |
|---|---|
| Measured variable | Displacement, liquid level; multi magnetic-ring position; position + speed dual output |
| Measuring range | 25–7620 mm optional; explosion-proof version 50–2500 mm |
| Non-linearity | Standard <±0.01 % FS; explosion-proof <±0.02 % FS (+60 μm minimum) |
| Repeatability | Standard <±0.001 % FS; explosion-proof <±0.005 % FS |
| Hysteresis | ±0.1 mm |
| Resolution | Standard 16-bit D/A, up to 0.5 μm; explosion-proof 16-bit A/D, infinite resolution |
| Update / frequency | Update time >1 ms; measurement frequency up to 3.7 kHz |
| Signal output | Standard: analog 4–20 mA / 0–10 V; SSI 24/25/26 bit binary or Gray code; Start/Stop digital pulse; Profibus-DP; CANbus (Open/Basic); Profinet. Explosion-proof: 4–20 mA (load 0/500 Ω) |
| Supply voltage | 24 VDC (−15/+20 %); working current <50 mA, varies with range |
| Protection | Polarity protection max −30 VDC; overpressure protection max 36 VDC; insulation 500 V between signal ground and casing |
| Working temperature | Normal type −40…+85 ℃; heat-resistant type −40…+105 ℃; humidity 90 %, no condensation |
| Temperature coefficient | <30 ppm/℃ |
| Protection rating | IP67 regular model; IP68 customized model |
| Rod pressure rating | Ø10 rod: 35 MPa continuous / 53 MPa peak; Ø7 rod: 30 MPa continuous / 40 MPa peak |
| Vibration / impact | Vibration 15 g, 100–2000 Hz, IEC 68-2-6; impact 100 g single, IEC 68-2-27 |
| EMC / certification | EN 50081-1, EN 50082-2; EN 61000-4-2/2/3/4/6, grade 3/4 class A; CE; GB/T 2423.34-2012 Z/AD temperature/humidity cycle |
| Wetted / structural parts | Sensor head 304L; pressure-resistant outer tube 304L; seal Viton 75 FKM |
| Code segment | Code | Description |
|---|---|---|
| Electronic compartment | A | 68 mm |
| B | 78 mm | |
| C | 48 mm (explosion-proof type) | |
| Head blind zone | 1 | 50.8 mm |
| Optional range | A | 25–7620 mm |
| B | 50–2500 mm (explosion-proof) | |
| End blind zone | 1 | 63.5 mm |
| Mounting thread | 1 | M18×1.5 |
| 2 | M20×1.5 | |
| 3 | 3/4″-16UNF-3A | |
| Magnet ring OD | 1 | OD17.4 |
| 2 | OD25.4 | |
| 3 | OD33 | |
| 4 | OD63.5 | |
| Rod diameter | A | 7 mm |
| B | 8 mm | |
| C | 10 mm | |
| D | 12 mm |
Explosion-proof analog interface wiring: 1 gray = analog signal output; 2 pink = not connected; 3 yellow = Com; 4 green = not connected; 5 brown = +24 VDC (−15/+20 %); 6 white = 0 VDC supply ground. This product does not provide an aviation plug output; a straight-out cable option is available. Mounting direction is arbitrary
The sensor is mounted inside the cylinder through the integrated flange; align the rod with the cylinder axis and match the magnet ring to the piston. Keep the rod parallel and free of side load. After wiring, check the compartment seal and cable gland against the rated protection. For explosion-proof service, use the explosion-proof joint and do not add an aviation plug.
Mobile and heavy machinery: hydraulic cylinders, injection moulding and die-casting, port and construction machinery, steel mills.
Energy and infrastructure: wind power, hydropower, offshore and oil & gas, shield tunnelling, marine equipment.
Process industry: metallurgical coking, machine control, hydraulic reservoir and tank level.
Send: required range, output type (analog / SSI / Start/Stop / Profibus-DP / CANbus / Profinet), rod diameter and mounting thread, magnet ring size, cylinder pressure and oil temperature, and whether explosion-proof or IP68 is required. We will confirm the compartment, range and selection code before quoting.
Can it measure hydraulic cylinder position?
Yes. The built-in magnetostrictive rod tracks the piston magnet ring and outputs absolute position or level, suitable for cylinder stroke feedback and hydraulic reservoir level.
How does absolute feedback track displacement after an unexpected power interruption?
Position is absolute and does not require a zero reset after power-up or a power cut; the magnetostrictive measurement references the fixed head end, so the position is known immediately on restart.
Can position and speed outputs support hydraulic motion control?
Yes. The sensor supports position + speed dual signal output and analog or bus interfaces, so motion controllers can use both stroke position and movement speed for closed-loop control.
Does hot hydraulic oil affect embedded sensor accuracy?
The heat-resistant type is rated to 105 ℃; the normal type to 85 ℃. The 304L head and outer tube and Viton 75 seal suit hydraulic service; confirm the oil temperature against the selected version before ordering.
How can the electronics be replaced without depressurizing the cylinder?
Because the flange is integrated with the cylinder, sensor service removes only two fixing screws to swap the electronic compartment; the cylinder remains pressurized and the oil does not need to be drained.
Send us the range, output and cylinder pressure/temperature. We will confirm the version 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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