1. Introduction

• The device is designed to monitor manhole cover status and is installed on the underside of the manhole cover. When abnormal movement of the manhole cover meets alarm conditions or liquid overflow occurs, an alarm will be triggered. The device transmits data such as manhole cover status and parameters to the monitoring center via wireless communication. The monitoring center will analyze the data and maintain it as necessary.

• Utilizing NB-IoT or 4G wireless communication technology, the device operates on battery power. It features easy installation, long battery life, high detection accuracy, and stable performance.

• Real-time Monitoring & Alerts
The device provides real-time response to changes in manhole cover status (e.g., overflow, tilt, opening) and transmits alarm signals. It simultaneously monitors battery voltage and triggers low-voltage alerts.
• Scheduled Status Reporting
The device automatically sends daily status reports (including battery voltage and cover status) to ensure operational visibility even in the absence of alarm events.
• Alarm Event Filtering
Equipped with a multi-level alarm filtering system, the device minimizes false alarms caused by vehicle vibrations or transient movements, effectively reducing energy consumption.
• Remote Parameter Configuration
The manhole cover monitor allows remote parameter adjustments, simplifying operation and maintenance.

3. Installation Instructions

• Determine installation position
Mark the screw hole locations on the manhole cover for securing the manhole cover status monitor.

• Surface preparation

Use a manual grinder to remove rust from the marked area，Smooth the surface with sandpaper to ensure a secure fit between the device and the manhole cover.

• Apply Thread-Locking Adhesive

Spray thread-locking adhesive onto the threads of the screws at the installation points. This prevents loosening caused by prolonged vibration of the manhole cover.