Overview
The Siemens Milltronics 7ML1100-0BA20 ST-H is a continuous ultrasonic level transducer that uses non-contact acoustic pulse technology to measure liquid levels in chemical storage tanks, wastewater systems, and industrial reservoirs. Its proven design and robust construction make it suitable for both standard and hazardous process environments. The narrow transducer profile allows mounting on a 2″ (50.8 mm) standpipe, providing straightforward installation and complete process isolation when mounted correctly.
Key Features
- Continuous, non-contact measurement – ultrasonic pulses measure level without touching process fluid
- 0.3–10 m (1–33 ft) range – suitable for most industrial tank applications
- 44 kHz frequency with 12° beam angle for focused, reliable readings
- Integral temperature sensor – automatically compensates for sound-velocity variations across operating range
- 2″ NPT process connection (ETFE material) – standard industrial coupling
- Hazardous location approvals – CE, UKCA, FM Class I/II, ATEX certified
- 10 m (32.81 ft) standard cable – extendable for remote mounting
Technical Specifications
| Measurement Range | 0.3–10 m (1–33 ft) |
| Operating Frequency | 44 kHz |
| Beam Angle | 12° |
| Process Connection | 2″ NPT (ETFE) |
| Cable Length | 10 m (32.81 ft) |
| Temperature Range – CSA/FM Models | –20°C to +73°C (–4°F to +163°F) |
| Temperature Range – ATEX Models | –20°C to +60°C (–4°F to +140°F) |
| Net Weight | 5.6 lb (2.5 kg) |
| Certifications | CE, UKCA, FM Class I/II/Div. 1 (Groups C–G), ATEX II 2G Ex mb |
| Country of Origin | Canada |
| Product Lifecycle | Active |
Typical Applications
- Chemical storage tanks – safe, non-contact level monitoring in corrosive environments
- Wastewater treatment facilities – reliable measurement with minimal maintenance
- Industrial liquid reservoirs – consistent accuracy across process variations
- Hazardous-location installations – certified for classified areas requiring intrinsic safety
- Standpipe-mounted systems – compact footprint for confined or retrofit applications
Compatibility & Replacements
Compatible With
- Siemens Milltronics ultrasonic level controllers and PLC systems
- HART communication protocol for remote diagnostics and calibration
- 4–20 mA analog output loops for data acquisition
- Hazardous and non-hazardous industrial measurement networks
- 2″ NPT standpipe configurations (standard industrial mounting)
Replaces / Drop-In Replacement For
- Earlier Siemens ST-H transducer variants (verify part number with integrator)
- Verify compatibility with your specific system integrator or Siemens controls application before ordering
Works With
- Siemens Milltronics ST-D, ST-U level controller series
- HART-enabled field instrumentation networks
- Industrial SCADA and PLC systems with 4–20 mA input modules
- Standard ultrasonic level measurement ecosystems
