Overview
The Siemens Milltronics ST-H ultrasonic level transducer is a reliable, continuously operating sensor designed for general liquid level monitoring applications. Ideal for measuring liquid level in chemical storage and liquid tanks, the ST-H combines precision measurement with industrial-grade durability. The ultrasonic controller measures the time between pulse emission and reflection to calculate distance, with an integral temperature sensor that compensates for sound velocity variations due to changes in air temperature.
Key Features
- Wide Measurement Range: 0.3 to 10 meters (1–33 feet) range
- Narrow Beam Pattern: 12° beam angle for precise target acquisition
- Ultrasonic Frequency: 44 kHz operating frequency
- Temperature Compensation: Integrated sensor maintains accuracy across varying ambient conditions
- Direct and Extension Mounting: Flexible 3-terminal connection options for direct or coaxial cable installation
- Durable Construction: Built for harsh, corrosive industrial environments
Technical Specifications
- Operating Frequency: 44 kHz
- Measurement Range: 0.3–10 m (1–33 ft)
- Beam Angle: 12°
- Temperature Operating Range (ATEX): Up to 140°F (60°C)
- Temperature Operating Range (CSA/FM): Up to 163°F (73°C)
- Connection Thread: 1″ NPT
- Mounting Options: Flange adapter, coupling, direct connection, and coaxial extension
- Transducer Type: Uni-Driver Crystal design
- Output Terminals: 3-terminal (white, black, shield)
- Compatibility: Siemens Milltronics level controllers (SITRANS LUT400, MultiRanger, HydroRanger)
Typical Applications
- Chemical storage tanks and reservoirs
- Liquid fuel and oil tank level monitoring
- Process water and wastewater management
- Industrial cooling tower level control
- Food and beverage processing vessels
- Pulp and paper industry tank monitoring
Compatibility & Replacements
Compatible With
- Siemens SITRANS LUT400 ultrasonic level controller
- Siemens MultiRanger 100/200 level transmitter
- Siemens HydroRanger 200 level controller
- Siemens Milltronics process instrumentation systems
- NPT and flange-mount standard industrial process connections
Replaces / Drop-In Replacement For
The ST-H is a standard Siemens Milltronics transducer; compatibility with legacy controllers should be verified with the original controller documentation or a system integrator to confirm proper wiring and configuration.
Works With
- Analog loop (4–20 mA) outputs via compatible Siemens level controllers
- RS-232/RS-485 serial communication (via controller)
- Profibus/Profinet networks (via compatible Siemens gateway or controller)
- Industrial automation software and SCADA systems supporting standard analog or digital level inputs
