Water table water level meter CS-iTWM-05D

The CS-iTWM-05D is a battery-powered manhole cover movement and internal water level monitor designed for long-term field deployment and wireless alarm reporting.

Overview
The device is mounted on the back of a manhole cover (normally horizontal). It monitors cover inclination and internal water level, reporting status and alarm events to a monitoring center via NB‑IoT or CAT.1. Alarms are generated when inclination exceeds a configurable threshold or when the internal float indicates excessive water level. The device supports periodic reporting and low-voltage warnings.

Working principle
The accelerometer measures the current inclination angle relative to the initial installation angle. A float mechanism detects internal water rise. When ABS(current angle - initial angle) > alarm angle threshold (default 10°, configurable) or when the float rises beyond its limit, the device transmits an alarm message to the monitoring center. The unit also sends routine status reports and low-battery alerts.

Functions

• Remote configuration and parameter management via supporting platform
• Real-time detection of normal/abnormal cover states (tilt, movement, breakage or drop)
• Automatic alarm reporting and restoration notifications
• Alarm localization and synchronized alarm information delivery
• Automatic work-order dispatch to maintenance personnel and maintenance result upload
• Self-checks including low-voltage detection and optional sub-surface temperature monitoring
• Power-saving modes with vertical 90° sleep and magnetic activation wake-up

Installation and operation

• Designed for mounting on the back side of manhole covers; intended for stable, long-term operation
• Configurable reporting intervals and immediate event-driven reporting on alarm/recovery
• Status indicators for power, alarm and operation
• Protection rating IP68 suitable for power, water supply and stormwater manholes

Illustrations

• Figure 1: product photo and installation illustration
• Figure 2: water level state illustration
• Figure 3 / Figure 4: dimensional drawings (sensor shape and size)

Technical specifications

• Model: CS-iTWM-05D
• Communication: NB‑IoT and CAT.1
• Power supply: Battery-powered (low-power design for long battery life)
• Detection methods: Accelerometer for inclination; float for internal water-level detection
• Default alarm angle threshold: 10° (configurable)
• Alarm conditions: Tilt beyond threshold or float indicating excessive water level
• Reporting: Configurable periodic reporting; event-driven alarm and low-voltage messages supported
• Installation: Rear mount on manhole cover for easy and stable mounting
• Protection: IP68
• Documentation: Product brochure available (PDF)