Description
Model: ESM-40S
The ESM-40S High Sensitivity Liquid Level Settlement System is designed for remote and high-precision monitoring of minute differential settlements in tunnels, bridges, buildings, foundations, and other large civil structures. Its design enables accurate, real-time tracking of even the smallest vertical movements over extended distances.
The system comprises low-pressure, high-sensitivity settlement sensors with digital output, connected in series to a reference reservoir and desiccant unit via fluid-filled and air vent tubes respectively. Each settlement sensor is installed at the same initial elevation as the reference sensor to ensure consistent hydrostatic balance.
When any monitored point settles or heaves relative to the reference reservoir, the resulting change in liquid head is detected by the settlement transducer, converting it into an electrical signal representing vertical displacement. The fluid level in the reference reservoir remains constant, providing a stable measurement baseline.
An interconnected air vent line, ending in a desiccant unit with moisture trap, equalizes atmospheric pressure throughout the system. This prevents measurement drift caused by air pressure fluctuations or local air currents, ensuring stable, long-term accuracy.
The ESM-40S can be integrated with the Encardio-rite model ESDL-30 digital datalogger for remote online data acquisition and transmission. Real-time readings allow engineers and project authorities to instantly detect even minute structural movements, enabling proactive maintenance, improved safety, and reduced project downtime.
Specifications
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Instrument type: High Sensitivity Liquid Level Settlement System
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Sensor type: Low-pressure, high-resolution digital liquid level transducer
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Configuration: Series-connected network of sensors and reference reservoir via fluid and vent lines
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Application: Monitoring differential settlement and heave in tunnels, bridges, buildings, dams, and other large structures
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Measured parameter: Vertical displacement / settlement
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Measurement principle: Hydrostatic liquid level comparison with digital output
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Data acquisition: Compatible with Encardio-rite ESDL-30 datalogger for remote or real-time monitoring
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System components:
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Settlement sensors (low-pressure type)
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Reference reservoir with constant fluid level
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Air vent line with desiccant and moisture trap
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Fluid-filled connecting tubing
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Key features:
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Extremely high sensitivity for minute settlement detection
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Digital output suitable for long cable transmission
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Immune to atmospheric pressure variations
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Fully sealed and low-maintenance design for long-term monitoring
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Enables remote, automated, real-time data access and alerts
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Typical accuracy: ±0.1 mm (depending on system length and calibration)
