Product Overview

The Masoneilan 12800 is a direct-acting pneumatic level controller built on the torque-tube displacer platform. It provides proportional or on/off pneumatic output to control valves without any electrical power. It's especially common in high-pressure steam drums and separators where pneumatic reliability is preferred over electronic devices.

Features

• Torque-tube displacer with no process seals
• Pneumatic proportional control
• Adjustable gain and reset settings
• Local setpoint knob
• Robust for high pressure/temperature
• Wide material options for corrosive service
• Simple maintenance – no electronics

Technical Specifications

• Range: 356 mm to 3048 mm (14" to 120")
• Max Pressure: Up to ANSI 2500 / PN 400
• Max Temperature: -196 °C to +400 °C
• Output: 3–15 psig (0.2–1.0 bar) pneumatic
• Supply Air: 20–100 psig typical
• Materials: Carbon steel, 316L SS, Hastelloy C, Monel

Applications

• Steam boiler drum level
• High-pressure separator level
• Interface control
• Pneumatic-only control loops

FAQ Q: Is it proportional only? A: Yes – adjustable proportional band and reset.

Q: High temperature ok? A: Yes – up to +400 °C.