Ultrasonic Level Meter — Integrated & Split Type
- Integrated type: ranges 0–3 up to 0–100 m; split type: 0–3 up to 0–70 m
- Accuracy 0.25%; blind zone from 0.15 m
- Output 4–20 mA and RS-485; relay control (2-channel integrated / 4-channel split)
- Supply 24 VDC or 220 VAC; IP68 protection
- Explosion-proof split version Exd(ia) II BT4; acid/alkali-proof version with PTFE-faced sensor
- 12864 dot-matrix display (integrated type)
Tell us your medium, range and process connection — we reply within 24 hours.
Factory-direct from WELK Meters
- Small MOQ Welcome
- OEM / ODM Support
- Reply Within 24 Hours
Overview
The ultrasonic level meter measures liquid level without contact, covering ranges from 0–3 m up to 0–100 m (integrated type) and 0–3 m up to 70 m (split type) with 0.25% accuracy and standard 4–20 mA plus RS-485 outputs. As a non-contact instrument it is well suited to media where submerged sensors are undesirable.
The integrated type combines sensor and electronics in one housing, with range options of 0–3, 5, 8, 10, 15, 20, 30, 40, 50 and 100 m, a blind zone of 0.15–0.7 m, working temperature -20 °C–+60 °C, pressure -1–16 kg (as printed), 2-channel relay control, IP68 protection and a 12864 dot-matrix display. The split type separates transmitter and sensor: ranges 0–3…70 m, blind zone 0.15–1.2 m, transmitter rated -20 °C–55 °C and sensor -25 °C–80 °C, with 4-channel relay control and IP68 protection. Both accept 24 VDC or 220 VAC supply.
The split family includes three sub-versions: an explosion-proof type (0–70 m, accuracy ±3 mm or 3–5‰, 40 KHz/24 KHz operating frequencies, 4°/6° full beam angle, DC24V 150 mA, Exd(ia) II BT4), an acid/alkali-proof type with PTFE-faced sensor (0–70 m, DC24V/AC220V, -20 °C–+60 °C, IP65) and a standard non-Ex type (0–70 m, DC24V/AC220V, IP65).
Features
- Non-contact ultrasonic measurement — no parts in the medium
- Integrated ranges up to 100 m; split ranges up to 70 m
- Accuracy 0.25%
- 4–20 mA and RS-485 outputs with relay control channels
- IP68 protection (integrated and split standard types)
- Explosion-proof, acid/alkali-proof and standard split sub-versions
- 12864 dot-matrix display on integrated type
Specifications
| Parameter | Integrated type | Split type |
|---|---|---|
| Measuring ranges | 0–3, 5, 8, 10, 15, 20, 30, 40, 50, 100 m | 0–3 … 70 m |
| Accuracy | 0.25% | 0.25% |
| Blind zone | 0.15–0.7 m | 0.15–1.2 m |
| Working temperature | -20 °C–+60 °C | Transmitter -20 °C–55 °C; sensor -25 °C–80 °C |
| Pressure | -1–16 kg (as printed) | — |
| Power supply | 24 VDC / 220 VAC | 24 VDC / 220 VAC |
| Output | 4–20 mA, RS-485 | 4–20 mA, RS-485 |
| Relay control | 2-channel | 4-channel |
| Protection rating | IP68 | IP68 (standard); sub-versions IP65 |
| Display | 12864 dot-matrix | — |
Split-Type Sub-Versions
| Sub-version | Key data |
|---|---|
| Explosion-proof type | 0–70 m; accuracy ±3 mm or 3–5‰; 40 KHz / 24 KHz; beam 4°/6° full angle; DC24V 150 mA; Exd(ia) II BT4 |
| Acid/alkali-proof type | 0–70 m; PTFE-faced sensor; DC24V / AC220V; -20 °C–+60 °C; IP65 |
| Standard non-Ex type | 0–70 m; DC24V / AC220V; IP65 |
Applications
- Non-contact level measurement in tanks, reservoirs and basins
- Corrosive liquids (acid/alkali-proof PTFE-faced version)
- Hazardous areas (explosion-proof Exd(ia) II BT4 version)
- Level control via built-in relay channels
FAQ
Should I choose the integrated or split ultrasonic level meter?
The integrated type houses everything in one unit with ranges up to 100 m and a local 12864 display; the split type separates the sensor (rated -25 °C–80 °C) from the transmitter and offers 4-channel relay control plus explosion-proof and acid/alkali-proof sub-versions.
Is there an explosion-proof ultrasonic level meter?
Yes. The split-type explosion-proof version is rated Exd(ia) II BT4, covers 0–70 m with ±3 mm or 3–5‰ accuracy, and runs on DC24V at 150 mA.
Can it measure corrosive liquids?
Yes. The acid/alkali-proof split version uses a PTFE-faced sensor. Contact us with your medium, range and tank details; we respond within 24 hours.
Four Probe Options for Every Liquid
The same transmitter accepts four interchangeable G2-thread probes, so one model covers clean water, sewage, foaming liquids and aggressive chemicals:
- Standard probe — clean and municipal water, general tanks and sumps
- Semi-sealed anti-corrosive probe — wastewater and mildly corrosive media
- Fully sealed IP68 PVDF probe — acids, alkalis and chemical storage such as sodium hypochlorite tanks
- Flame-retardant probe — sites with fire-safety requirements; custom builds available
Extended probes (300 mm and longer) can be supplied so the sensor face clears thick roof slabs and pit covers instead of firing inside the mounting hole.
IP68 Proven by 30 Months of Continuous Submersion
We do not just quote an IP rating — we verify it. A complete IP68 unit has been kept fully submerged in our showcase tank since February 2023, accumulating more than 21,600 hours (30 months) of continuous powered operation under water. The design also passes fog, stirring and anti-corrosion verification, which is why this meter is trusted in humid wells, underground pump stations and outdoor tanks.
Installation Options
Every unit ships with a G2 process thread (30 mm thread length) and can be ordered with the mounting hardware your site needs:
- Thread mounting — direct G2 connection on tank nozzles and adapters
- Flange mounting — PP flange for corrosive service or 304 stainless steel flange for industrial tanks
- Bracket mounting — wall or handrail brackets with a sunshade plate for open channels and outdoor sumps
- Stilling well (waveguide tube) — for narrow pits or foaming surfaces; for ranges up to 4 m use a single continuous tube with an inner diameter of at least 200 mm
Keep the area above the instrument ventilated and the probe face clear of the mounting hole — our engineers review your installation drawings free of charge before shipment.
Key Dimensions (Integrated Type)
- Housing diameter: 102 mm (transparent cover 98 mm); 135 mm overall with cable glands
- Total height: 260 mm; thread section 85 mm
- Process connection: G2 male thread, 30 mm thread length, fits standard PP / 304 flanges
- Probe face diameter: 54 mm (standard); hex base 92 mm
100% Aging and Calibration Before Shipment
Every transmitter and probe runs on our aging racks and is then calibrated against reference levels on the distance test bench before packing. The photos in the gallery are taken in our own workshop — what you see on the aging racks is what arrives at your site.
