Level Transmitter Configuration and Operating Guide
Level transmitters provide continuous level measurement for process control, inventory management, and safety system applications. Proper configuration ensures accurate and reliable measurements.
I. Types and Applications
- Differential Pressure: Measures hydrostatic head pressure. Simple and reliable for clean liquids in vented or pressurized tanks.
- Guided Wave Radar: Uses microwave pulses guided along a probe. Excellent accuracy, unaffected by vapor or foam.
- Non-Contact Radar: Uses free-space microwave pulses. Suitable for harsh conditions and wide temperature ranges.
- Ultrasonic: Non-contact measurement using sound waves. Cost-effective for clean liquids.
- Magnetostrictive: High accuracy using magnetic float on a sensing wire. Ideal for custody transfer applications.
II. Configuration
- Set the tank geometry parameters: total tank height, sensor mounting offset, and any non-measurable zones
- Configure the output range. Set the Lower Range Value corresponding to zero percent and Upper Range Value at one hundred percent
- Set the damping time constant appropriate for the application. Faster response for control loops, slower for inventory applications
- Configure alarm thresholds for high-high, high, low, and low-low level conditions as required
III. Commissioning
- Verify the empty tank reading corresponds to the configured zero point
- Fill the tank to a known level and verify the transmitter reading
- Compare readings against an independent reference measurement at multiple levels
- Document all commissioning parameters for future maintenance reference
IV. Maintenance
- Quarterly: Check for configuration drift, verify output accuracy
- Biannually: Clean probe or antenna if buildup is observed
- Annually: Full calibration verification, inspect all components for corrosion or damage
