MLC Bubbler Level Transmitter (Purge-Type Level Gauge)

Bubbler-type level transmitter that measures level, density and interface without contacting the medium — for high-temperature, high-viscosity, crystallizing and radioactive services.

Key Specifications

Model: MLC
Principle: Bubbler (air purge) hydrostatic
Size / Connection: Flanges DN50–DN150
Measuring range: Measuring range 0–50 m
Accuracy: ±0.1% FS (incl. linearity and repeatability)
Output / Protocol: 4–20mA DC two-wire with HART

Category: Level Transmitters » Bubbler Level System

Keywords:bubbler level transmitter air purge level measurement level transmitter for viscous media non-contact level measurement

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The MLC measures level hydrostatically through a purge (bubbler) tube: apart from the dip tube, nothing contacts the medium, so it keeps working where contact instruments fail — high temperature (media -196 C to +450 C), high vacuum, viscous, crystallizing, radioactive and heavily fouling liquids.

Built with the MFC1 purge device as a complete bubbler system, it offers linear correction, automatic error compensation and self-diagnostics, with a dot-matrix LCD and local keys for setup. Anti-clogging, anti-backflow and heat-traced designs are available.

Key Features

Non-contact principle — ideal for corrosive, viscous, crystallizing and radioactive media
Automatic output tracking keeps purge flow stable as back-pressure changes
Works with gas source and differential pressure transmitter as a complete system; DCS / PLC ready
Explosion-proof design with built-in keyboard for safe local setup in hazardous areas
Transmitter options from mainstream brands can be integrated on request

Technical Specifications

Nominal pressure	ANSI: 150lb, 300lb, 600lb GB: 1.6MPa, 4.0MPa, 6.3MPa, 10MPa
Medium temperature	-196~450°C
Installation	top or side mounting
Connection sizes	DN50 ~ DN150 flange (contact us for details)
Ambient temperature	intrinsically safe: -30~60°C; flameproof: -20~60°C
Ambient humidity	10%~90%RH
Air supply pressure	0.4MPa
Purge air flow	max. 400L/h (20°C, standard)
Wetted materials	304, 304L, 316, 316L, 321 etc.stainless steel
Local display	dot-matrix LCD, dot-matrix LCD display
Output	4~20mA DC, two-wire
Standard version	12V–40VDC
Intrinsically safe version	12V–30VDC
Flameproof version	12V–40VDC
Load resistance	≤( Us – 12V) / 22.5mA (Us = supply voltage)
Communication	HART , 250Ω
Accuracy	±0.1%FS (incl. linearity and repeatability)
Protection class	IP65
Cable entry	M20×1.5(F), 1/2″NPT(F)optional
Data setting	(4~20mA 20~4mA) (mm, m), and

FAQ

How does a bubbler level transmitter work?

A constant flow of purge air is fed down a dip tube; the back-pressure in the tube equals the hydrostatic pressure of the liquid column, which the transmitter converts into level, density or interface.

Where is the MLC the best choice?

In dirty, viscous, crystallizing, high-temperature or radioactive services — crude and sludge tanks, sewage and slurry pits, HF and sulfuric acid tanks — where contact instruments clog or corrode.

What does the MLC need to operate?

A clean air supply above 0.4 MPa and the MFC1 purge device to hold the purge flow constant (max. 400 L/h per line).

Request a Quote

Send your medium, pipe size, flow range, temperature and pressure to admin@hainameter.com or WhatsApp +86 15671082677.