Portable Ultrasonic Liquid Level Indicator - Smagall HS-MLI

Portable Ultrasonic Liquid Level Indicator - Smagall HS-MLI - Image 2

Portable Ultrasonic Liquid Level Indicator - Smagall HS-MLI - Image 3

Portable Ultrasonic Liquid Level Indicator – Smagall HS-MLI

The Smagall HS-MLI is a handheld ultrasonic instrument that detects the presence of liquid at a chosen height on the outside of a sealed tank, cylinder, or pipeline — without opening it, drilling into it, or making contact with the contents inside. It’s widely used by marine, offshore, and fire-safety teams to check gas levels in CO2, Halon, FM200, and similar fire-suppression cylinders, as well as general liquid storage tanks.

Because it reads through the tank wall itself, there’s no need for sight glasses, floats, or any physical modification to the vessel — place the probe against the tank, press one button, and the result (liquid or no liquid) shows instantly on screen, accurate to within 5mm.

Key Benefits

Non-contact detection — no drilling, welding, or opening the tank required
Accurate to within 5mm, with results shown in seconds
Works through steel, stainless steel, glass, and unformed plastic walls up to 30mm thick
Simple one-button operation — no specialist training needed
Suitable for CO2, Halon, FM200™, NAF S III, FE 13, CEA 410, Novec 1230, and other liquid-form fire-suppression agents, plus general industrial liquids

90-Day Warranty · No Minimum Order Quantity · Ex-Stock SG

Get a quotation for the HS-MLI, or ask us which probe configuration fits your tank setup.

Category: Liquid Level Indicator

Description

Why It Stands Out

Checking gas or liquid levels in a sealed cylinder usually means either an inline sight gauge fitted at installation, or physically removing and weighing the tank — both of which add cost, and neither is practical for a large bank of fire-suppression cylinders that need routine checks. The HS-MLI sidesteps both problems. Its ultrasonic probe reads through the tank wall from the outside, so the same handheld unit can be used across as many tanks or cylinders as your site has, with no per-tank hardware to install or maintain.

This also makes it a safer option for toxic or corrosive liquids, since the probe never contacts what’s inside the tank. Multiple readings can be taken at different heights on the same tank to build up a picture of the fill level, and the high-contrast OLED display stays readable even in direct outdoor sunlight — a common complaint with cheaper LCD-based units used on deck or in the field.

The unit ships as one probe with a fixed rod, but the probe head accepts different rod lengths and angles depending on how tanks are arranged at your site — useful where tanks are mounted close together, in racks, or in positions that are awkward to reach with a straight probe.

Who It’s For

Marine and offshore crews – checking CO2 or other fire-suppression cylinder levels during routine safety inspections
Fire safety and facilities teams – managing banks of suppression cylinders in commercial or industrial buildings
Security and construction operators – needing a portable, non-contact way to check liquid levels in sealed containers
Industrial and process teams – working with tanks holding toxic, corrosive, or otherwise hard-to-sample liquids

Watch: Operational Guide

See the HS-MLI in action — how to position the probe, take a reading, and interpret the result on a live tank.

Ready to check gas or liquid levels without opening the tank? Get a quotation for the HS-MLI today.

No minimum order quantity, and our team can help you confirm which probe configuration suits your tanks.

Product Specifications

Measurement Performance
Measurement Accuracy	< 5mm
Measurable Wall Thickness	3 – 30mm
Measurable Tank Material	Steel, stainless steel, glass, unformed plastics
Measurable Medium	Pure liquid, milky liquid, suspension liquid
Applicable CO2 Tank Diameters	210–230mm, 265–285mm, 340–360mm, 390–410mm, 410–440mm (tanks outside these ranges are treated as standard/common tanks)
Applicable Common Tanks	Vertical, horizontal, or spherical tanks (diameter > 3m) outside the CO2 diameter ranges above
Operating Environment
Ambient Temperature	-20°C to 60°C (-4°F to 140°F)
Ambient Humidity	15% – 85% RH
Power
Power Supply	2 x 18650 lithium rechargeable batteries
Average Current Draw	~150mA
Operation Duration	Over 8 hours on a full charge
Package Includes
Standard Package (HS-MLI-1)	1x Indicator unit, 1x Standard Probe Rod (190mm), 1x Instruction Manual, 1x Calibration Cert, 1x Carrying Case, 2x 18650 rechargeable batteries with charger
Other Probe Configurations	Extension Probe Rod (600mm), 90° Probe Rod, or combinations of the above — available on indent basis, see FAQ

Frequently Asked Questions

1. What's the difference between the HS-MLI-1 to HS-MLI-6 versions?

They're the same indicator unit paired with different probe rod configurations:

HS-MLI-1 — Standard Probe Rod (190mm) — in stock
HS-MLI-2 — Extension Probe Rod (600mm) — indent basis
HS-MLI-3 — 90° Probe Rod (245mm) — indent basis
HS-MLI-4 — Standard + Extension Probe Rod — indent basis
HS-MLI-5 — Standard + 90° Probe Rod — indent basis
HS-MLI-6 — Extension + 90° Probe Rod — indent basis

The right configuration depends on how your tanks are arranged and how easy they are to reach directly — the extension rod suits multi-row tanks, and the 90° rod helps where the probe needs to reach around an obstruction.

2. Which version do you have in stock?

We stock the HS-MLI-1 (standard probe rod) ex-stock for fast delivery. The other configurations (HS-MLI-2 to HS-MLI-6) are supplied on an indent basis — contact us for current lead times.

3. Does the HS-MLI come with batteries?

Yes. While Smagall doesn't include batteries with the unit as standard, we supply 2 x 18650 lithium rechargeable batteries with a charger as part of every set we sell, since these aren't always easy to source locally.

4. What tank sizes and materials can the HS-MLI measure?

It works on steel, stainless steel, glass, and unformed plastic tanks with wall thickness between 3mm and 30mm. For CO2 cylinders, it's calibrated for diameters of 210–230mm, 265–285mm, 340–360mm, 390–410mm, and 410–440mm; tanks outside these ranges are measured as standard/common tanks instead.

5. What gases and liquids can it detect?

It's commonly used on CO2, Halon, FM200™, NAF S III, FE 13, CEA 410, and Novec 1230 fire-suppression tanks, as well as general pure, milky, and suspension liquids — as long as the medium is in liquid form and free of crystallisation or solid particulates.

6. Is Unitech an authorised distributor for Smagall?

Yes, Unitech Supplies is the official distributor for Smagall products in Singapore.