The NT M-Atex Series ATEX Explosion-Proof Level Switch is engineered and manufactured by Bühler Technologies GmbH – a premier German technology leader specializing in fluid control systems and industrial process automation. The NT M-Atex series is specifically developed to fulfill the most stringent explosion protection safety regulations (ATEX Directive) for liquid level monitoring and limit alarming inside hazardous operating areas with flammable gas, vapor, or mist presence.

Operating on a proven magnetic float principle, the Bühler NT M-Atex utilizes a magnetic float moving vertically along a guide tube. Hermetically sealed reed contacts are positioned inside the guide tube. As liquid level fluctuates, the magnetic float actuates or deactuates reed contacts at pre-configured alarm setpoints (high level, low level, or intermediate switching thresholds). Alarm signals are transmitted to central controllers or intrinsically safe isolating amplifiers (Ex-i) to actuate refill pumps, trigger emergency shut-off valves, or sound warning sirens.

Key technical highlights of the Bühler Technologies NT M-Atex:
- ATEX Explosion-Proof Safety Certification: Certified for safe operation inside hazardous areas (Ex-Zone 1/2 or Zone 0/1 depending on configuration), preventing electrical spark ignition in chemical gas and fuel vapor environments.
- High-Grade Corrosion-Resistant Materials: The guide tube and float assembly are fabricated from 316L Stainless Steel (1.4571), precision-machined Brass, or chemical-resistant engineering polymers, providing superior resistance against corrosive hydraulic fluids, mineral oils, solvents, and industrial chemicals.
- Modular & Flexible Configuration: Allows customization of sensor stem length according to tank depth, selection of 1 to 4 switching contact setpoints (NO / NC / SPDT), and optional integration of a PT100 temperature sensor for simultaneous level and liquid temperature monitoring on a single unit.
- Heavy-Duty Industrial IP65/IP67 Enclosure Rating: Electrical connection housings are securely built into robust explosion-proof junction boxes, resisting ingress of dust, moisture, and chemical vapors under harsh outdoor or industrial plant environments.

The Bühler NT M-Atex ATEX Level Switch is an indispensable safety instrument across oil refineries, fuel distribution depots, chemical processing facilities, heavy-duty industrial hydraulic power units, thermal power stations, and manufacturing lines requiring certified Ex safety.

• Manufacturer: Bühler Technologies GmbH
• Product Line / Model: NT M-Atex (NT M Series ATEX)
• Device Type: ATEX Explosion-Proof Liquid Level Switch
• Country of Origin: Germany
• Explosion-Proof Certification: ATEX Directive (Zone 1/2 or Zone 0/1 Ex ia / Ex d certified)
• Operating Principle: Magnetic float actuating hermetically sealed reed contacts
• Wetted Parts Materials: 316L Stainless Steel (1.4571) / Precision Brass / NBR or Stainless Steel Float
• Sensor Probe Length: Customized according to application from 200 mm to 1500 mm
• Number of Switching Contacts: 1 to 4 configurable switching points (NO / NC / SPDT)
• Minimum Fluid Density: ≥ 0.7 g/cm³
• Max. Operating Pressure: Up to 10 bar - 25 bar (Model dependent)
• Fluid Operating Temperature: -20°C to +80°C (High-temperature options up to +100°C)
• Ambient Operating Temperature: -20°C to +70°C
• Contact Rating: Max. 250V AC/DC, 0.5A - 1A, max switching power 40VA
• Enclosure Protection Rating: IP65 / IP67
• Process Connections: Threaded Flanges G1", G1 1/2", G2" or DIN/SAE standard flanges
• Electrical Connections: Explosion-proof terminal box with cable glands M16x1.5 / M20x1.5
• Target Media: Hydraulic oils, lubricating oils, fuels, solvents, industrial chemicals, and Ex-zone fluids.