Cable water level meter CS-iTWLM

water table

The CS-iTWLM is a manhole-cover-mounted device that monitors cover tilt/movement and detects water-level exceedance, transmitting alarm messages wirelessly to a monitoring center via NB‑IoT or CAT.1.

Overview
The device is mounted on the underside of a manhole cover (normally horizontal). It continuously measures cover inclination with an accelerometer and monitors water level with a float sensor. When configured tilt or water-level thresholds are exceeded, the unit sends alarm messages to a monitoring center for analysis and response.

Key functions and behaviour

• Dual wireless communication: NB‑IoT and CAT.1.
• Battery-powered, designed for low-power, long-life operation with low-voltage warning.
• Manhole cover inclination detection via accelerometer (acceleration sensor).
• Water-level exceedance detection via float sensor with customizable cable/length for different well depths.
• Alarm triggered when inclination angle exceeds the configured threshold (default 10°, configurable) or when the float indicates water-level exceedance.
• Configurable periodic status reporting; transmitted messages distinguish alarm and normal states.
• Low-battery reporting via dedicated warning messages.

Working principle
The accelerometer measures the current inclination angle of the manhole cover and the float detects water-level rise. An abnormal condition is defined as ABS(current angle − initial angle) > alarm angle threshold or float activation indicating water-level exceedance. On abnormality, the device transmits an alarm message to the monitoring center for handling.

Illustrations / additional material on page

• Figure 1: product photo showing installed device and general appearance.
• Figure 2: schematic of water-level states and float operation.
• Figure 3: dimensional drawing (shape and size).
• Technical parameters are provided on the page as a table image (see technical parameters figure).

Technical characteristics / specifications

• Model: CS-iTWLM (CS-iTWLM-05D variant noted where applicable).
• Communications: NB‑IoT, CAT.1.
• Power: battery, low-power design; supports periodic reporting and low-voltage self-check.
• Sensors: accelerometer for tilt detection; float sensor for water level.
• Default alarm angle threshold: 10° (configurable).
• Alarm conditions: tilt angle beyond threshold OR float indicating water-level exceedance.
• Report modes: configurable periodic reporting interval; alarm and status flags included in messages.
• Typical applications: manhole cover movement detection and underground water-level monitoring with remote alarm transmission to a monitoring center.