Guiyang.bai@honno-auto. com
86-13840589744
Non-contact ultrasonic liquid level gauge, 5–40 m, ±0.3% FS, 1 mm resolution, OLED menu, 4–20 mA / RS485 / relay, 12–24 VDC or 220 VAC, IP65.
The HNL100-A ultrasonic level gauge is a versatile universal instrument with a fully digital, humanized design, covering level measurement and control, data transmission and human-machine communication. It uses modular circuit design, a military-grade multilayer PCB and a tight, well-laid-out hardware structure, supports isolated 4–20 mA output, and can carry built-in wireless data transmission such as GPRS, GPS and Bluetooth. Imported industrial-grade chips and digital temperature compensation give strong anti-interference; upper and lower limit nodes are freely settable with on-site display.
The gauge suits water treatment and sewage plants, water supply and reservoir monitoring, chemical storage tanks, open channels and flumes, material level in silos and hoppers, food and beverage tanks, mining slurry and thickener tanks, irrigation and canal monitoring, oil and fuel tank level, industrial wastewater sumps and pump stations, non-contact measurement of sticky or corrosive media, and remote monitoring with GPRS or Bluetooth.
Good fit: water treatment and sewage plants, water supply and reservoirs, chemical tanks, open channels and flumes, silo and hopper material level, food and beverage tanks, mining slurry and thickener tanks, irrigation and canals, oil and fuel tanks, wastewater sumps and pump stations, sticky/corrosive media, remote GPRS/Bluetooth monitoring.
Choose HNL100-A when:
You need non-contact level or distance measurement without a probe entering the medium, avoiding entanglement, blockage, leakage, corrosion and maintenance issues of pressure, capacitance or float methods.
The required range is within 5–40 m and the application works at normal temperature and pressure.
You need 4–20 mA, RS485, relay, NPN pulse or analog voltage output, plus optional GPRS / Bluetooth remote transmission.
Confirm with us first when: the vessel has strong foam, steam, dense dust or heavy condensation that can weaken the echo, the medium surface is agitated or the mounting area has internal obstructions that create false echoes.
Imported industrial-grade chips with digital temperature compensation; wide-voltage operation, backup and restore settings, adjustable analog output, freely settable full-range start and end points, custom serial port data format, and three- or four-wire support. Value-added / differential distance measurement is available for both distance and level; emission pulse intensity is settable 0–100 to match the working condition.
OLED Chinese/English menu with self-illumination; minimum display resolution 1 mm; three light patch buttons. Upper and lower limit nodes and online output adjustment are set on site.
ABS engineering plastic waterproof housing, compact and sturdy. Isolated 4–20 mA output; MiniSD card acquisition or USB storage can be added; additional modules can be added to meet customer needs.
| Model | HNL100-A — Ultrasonic level gauge |
|---|---|
| Measuring range | 5, 8, 10, 12, 15, 20, 25, 30, 35 or 40 m (selected on order) |
| Blind zone | <0.4–2 m, depending on range |
| Error | ±0.3 % FS |
| Display / resolution | OLED Chinese/English self-illuminating menu; minimum resolution 1 mm; three light patch buttons |
| Working frequency | 20–350 kHz, varies by model specification |
| Power supply | 12–24 VDC or 220 VAC (optional) |
| Outputs (optional) | 4–20 mA RL >600 Ω (standard); 1–5 V / 1–10 V; RS485 (Bluetooth conversion accessory optional); GPRS; 3-channel NPN (configurable as PP pulse); 2-channel relay (AC 5 A 250 V / DC 10 A 24 V) |
| Instrument material | ABS engineering plastic |
| External dimensions | Ø92 mm × 198 mm × M60; Ø92 mm × 270 mm × DN80 |
| Electrical interface | M20×1.5 (two sets) |
| Installation interface | M60×2, Ø61 mm round hole (with large nut), or DN80 non-standard |
| Working environment | Normal temperature and pressure |
| Protection level | IP65 (higher protection customizable) |
| Explosion-proof grade | Ex ia IB T4 Ga, on order |
| Terminal | Function |
|---|---|
| 5 / 6 | DC12–24 V+ / DC12–24 V− |
| 9 | 4–20 mA current output |
| 3 / 4 | RS485(A) / RS485(B) |
| 1 / 2 | Relay I: J1_COM / J1_NO |
| 10 / 11 | Relay II: J2_COM / J2_NO |
Incoming cable connects to internal terminals that the user can customize; local wiring and local use are configurable per channel.
| Code segment | Code | Description |
|---|---|---|
| Range | 1 | 5 m |
| 2 | 8 m | |
| 3 | 10 m | |
| 4 | 12 m | |
| 5 | 15 m | |
| 6 | 20 m | |
| 7 | 25 m | |
| 8 | 30 m | |
| 9 | 35 m | |
| 10 | 40 m | |
| Power supply | 1 | 12–24 VDC |
| 2 | 220 VAC | |
| Output method | M | 4–20 mA RL >600 Ω (standard) |
| V | 1–5 V / 1–10 V | |
| R | RS485 (Bluetooth conversion accessory optional) | |
| D | GPRS | |
| E | 3-channel NPN (PP pulse configurable) | |
| F | 2-channel relay (AC 5 A 250 V / DC 10 A 24 V) | |
| External dimensions | 1 | Ø92 mm × 198 mm × M60 |
| 2 | Ø92 mm × 270 mm × DN80 | |
| Installation interface | A | M60×2 |
| B | Ø61 mm round hole (with large nut) | |
| C | DN80 non-standard | |
| Work environment | 1 | Normal atmospheric temperature |
| 2 | Normal pressure |
Mount the gauge so the transducer faces the liquid or material surface vertically, clear of inlet jets, agitator blades, heating pipes and internal brackets that can cause false echoes. Keep the transducer out of the blind zone and away from wall buildup. In foamy, steamy or dusty service, confirm the echo returns reliably before commissioning; set the emission pulse intensity and damping to match the medium.
Water and wastewater: treatment plants, sewage, reservoirs, open channels and pump stations.
Process tanks: chemical, food and beverage, oil and fuel storage.
Solids: silo and hopper material level, mining slurry and thickener tanks.
Remote monitoring: GPRS or Bluetooth transmission to a remote level display and overflow alarm.
Send: medium and surface condition, required range, tank or channel size and mounting location, supply voltage, output preference (4–20 mA / RS485 / relay / NPN / voltage), wireless requirement, and any hazardous-area classification. We will confirm the range, housing and selection code before quoting.
How large is the ultrasonic blind zone?
The blind zone is below 0.4–2 m depending on the selected range. Keep the transducer mounting above the maximum liquid level by at least the rated blind zone so the closest surface returns a valid echo.
How do foam and steam affect non-contact level echoes?
Thick foam, steam or vapor can scatter or absorb the ultrasonic pulse and weaken the return. In such duty, describe the surface condition; a different measurement principle may be more reliable if the echo is unstable.
Can dust or condensation weaken the return signal?
Dense dust and condensation can attenuate the ultrasound path and fog the transducer face. Keep the transducer face clean, verify the echo on site, and set pulse intensity and damping for the condition.
Which output supports remote level display and overflow alarm?
4–20 mA or RS485 feeds a remote display or PLC; two relay channels and three NPN channels provide local limit switching for overflow or dry-run alarm. GPRS or Bluetooth adds remote transmission where selected.
What mounting location avoids false echoes from tank internals?
Mount vertically over a clear surface, away from inlet flow, agitator, pipes and brackets. Avoid corners and wall buildup; verify the strongest echo corresponds to the surface and configure any false-echo rejection during setup.
HNL100-A Ultrasonic Level Gauge Datasheet (PDF) — view all product manuals on our Download page »
Send us the medium, range and mounting condition. We will confirm the range, output and selection code before we quote.
Send us your application details »
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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