CST-MLG Magnetic Level Gauge

Product Overview

• The CST-MLG is a bypass-chamber magnetic level gauge engineered to European design and safety standards for continuous level indication in boilers and pressure vessels.
• A guided float with a permanent magnet follows the liquid surface inside a sealed chamber; the magnetic field couples through the chamber wall to rotate a row of bi-colour flags (or light up an LED column), showing red above the liquid level and white/silver below it.
• Because the process fluid is fully enclosed in a welded chamber, there is no glass in contact with the process — eliminating the failure mode of reflex or transparent sight-glass gauges under pressure and thermal cycling.
• Each unit is individually serialised and supplied with material and hydrostatic test certification suitable for boiler-plant inspection and insurance requirements.
• Widely used on steam drums, mud drums, feedwater vessels, deaerators, condensate receivers and blow-down flash vessels.

Features

• Fully welded, glass-free chamber — no sight glass in contact with process fluid.
• Bi-colour magnetic flag column or 24 VDC LED indicator column, readable in low light and from a distance.
• Titanium or stainless steel float, sized and calibrated to the density, pressure and temperature of the service fluid.
• DN20 flanged process connection as standard (DN25 / DN40 / DN50 available on request), rated PN16 / PN25 / PN40.
• Chamber and wetted parts in stainless steel (SS304 standard, SS316L on request) for feedwater and steam-condensate compatibility.
• Optional 4–20 mA magnetostrictive or reed-switch level transmitter, plus adjustable SPDT reed relay switches for high/low level alarm and pump control.
• IP65-rated enclosure, suitable for outdoor boiler-house installation.
• Traceable material certificates (EN 10204 3.1) and hydrostatic test report issued with every unit.
• Stainless steel float-support springs fitted top and bottom as standard, protecting the float during transport and pressure surges.

Technical Parameter

• Model series: CSTMLG (chamber type, magnetic coupled)
• Example model: CSTMLG-CC350PN25LED
• Indicator type: Bi-colour magnetic flag column, or 24 VDC LED indicator column
• Center-to-center length: 100 – 6000 mm (project-specific, per boiler drum tapping distance)
• Process connection: DN20 flanged standard (DN25 / DN40 / DN50 on request)
• Nominal pressure rating: PN16 / PN25 / PN40
• Design temperature: –40 °C to +250 °C (chamber); consult factory for saturated steam service above 250 °C
• Chamber / body material: Stainless steel SS304 (SS316L available)
• Float material: Titanium (standard for high-temperature boiler service) or stainless steel
• Flange material: Stainless steel, drilled to EN 1092-1
• Protection class: IP65
• Power supply (LED variant): 24 VDC
• Optional output: 4–20 mA level transmitter; SPDT reed relay level switches
• Mounting orientation: Vertical, side or top/bottom entry bridle mounting

Industry Application

• Steam drum level indication on water-tube and fire-tube boilers, mounted via external bridle (bypass) piping.
• Feedwater tank and deaerator level indication upstream of boiler feed pumps.
• Condensate receiver and blow-down flash vessel level monitoring.
• Local back-up indication alongside electronic drum-level transmitters, as required by boiler insurance bodies and codes such as EN 12952 (water-tube boilers) and EN 12953 (shell boilers).

Standards & Compliance

• Pressure Equipment Directive (PED) 2014/68/EU — CE marking applied per the assessed conformity route for the ordered pressure and volume category.
• RoHS Directive 2011/65/EU.
• EN 1092-1 flange dimensions and drilling.
• EN 10204 material certification (3.1 certificates available on request).
• Design guidance aligned with EN 12952 (water-tube boilers) and EN 12953 (shell boilers).
• Each gauge carries a permanent stainless steel nameplate with model code, serial number, manufacture year, rated pressure/temperature, CE marking and applicable directive references.

Ordering Code

Example: CSTMLG-CC350PN25LED

For boiler applications, please provide the drum tapping centre distance, design pressure and temperature, and service fluid (feedwater / saturated steam / condensate) when requesting a quotation, so float buoyancy and materials can be confirmed for the specific service.