Level monitoring unit CS-iTWMD

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The CS-iTWMD-05D manhole cover tilt and water-immersion monitor is designed to detect manhole cover inclination/movement and rising water level, and to transmit alarm and status messages wirelessly to a monitoring centre. The device is battery-powered for simplified installation and extended service life, and supports low-power wide-area network communications.

Key features

• Wireless communication: supports NB‑IoT and CAT.1 transmission modes.
• Battery powered: low-power design for long battery life and no-wiring installation.
• Accurate detection: uses acceleration sensor for tilt detection and float sensor for water-level detection.
• Easy mounting: external installation on the back of the manhole cover (normal state = cover horizontal).
• Configurable alarm conditions: tilt alarm angle threshold (default 10°, configurable) and float-based water-level alarm.
• Configurable reporting: periodic reports with adjustable interval; status flag indicates alarm vs normal messages.
• Low-voltage reporting: device sends low battery warnings.
• Power saving: vertical 90° auto-sleep with magnetic activation to extend battery life.

Working principle
The device measures the current inclination angle of the manhole cover using an acceleration sensor and detects water-level exceedance via a float sensor. An alarm is triggered when ABS(current angle − initial angle) > alarm angle threshold (default 10°, configurable) or when the float indicates water-level exceedance. Alarm signals are transmitted wirelessly to the monitoring centre for analysis and follow-up.

Documentation and illustrations on page

• Main technical parameters are provided in a table (Table 1) shown on the product page as an image.
• Operational/installation figure (Figure 1) and dimensional drawing (Figure 3) are included on the product page as images.

Platform capabilities

• Parameter configuration and remote management via the accompanying platform.
• Alarm statistics, map display and alarm highlighting for fast localisation.
• Automatic work-order dispatch to maintenance personnel and closed-loop management with uploadable maintenance results.
• Permission-level management and large-screen display support for operations centres.

Technical specifications

• Communication modes: NB‑IoT, CAT.1.
• Power supply: battery (low-power, long-life design).
• Detection methods: acceleration sensor for tilt; float sensor for water level.
• Default alarm angle threshold: 10° (configurable).
• Reporting: configurable periodic reporting interval; status flag included in reports.
• Alarming logic: ABS(current angle − initial angle) > threshold OR float rise (water-level exceedance).
• Low-voltage reporting: device sends low battery warnings.
• Mounting: external installation on the back of the manhole cover; normal state = cover horizontal.
• Main technical parameters and dimensions: available in images labelled Table 1 and Figure 3 on the product page.