System Sensor M501M. Monitor Module.

System Sensor M501M Monitor Module

The System Sensor M501M Monitor Module provides intelligent monitoring of normally open contact devices in addressable fire alarm systems. Designed for use with System Sensor panels and compatible addressable loops, this module supervises a single circuit and reports changes in status back to the control panel.

Thanks to its compact form factor and simplified wiring, the M501M is ideal for monitoring waterflow switches, pull stations, tamper switches, and other dry-contact devices.

Reliable Monitoring for Single-Input Devices

The M501M supports real-time supervision of connected devices and circuits. When the monitored input changes state—such as a pull station being activated or a sprinkler switch detecting flow—the module immediately sends that information to the fire alarm control panel. This quick communication ensures rapid system response in the event of a fire or emergency.

Because it is addressable, each M501M module provides a unique identification on the system. This helps responders quickly locate the activated zone or device, which can significantly reduce response time.

Space-Saving Design and Easy Installation

Unlike larger monitor modules, the M501M features a compact, plug-in design that allows mounting directly behind the monitored device. This saves space and reduces the need for dedicated mounting boxes, especially useful in retrofits or installations with limited room.

Installers can wire the module using a standard two-wire connection, and its status LED provides clear visual feedback for testing and troubleshooting.

Integration with System Sensor Protocols

The M501M is compatible with addressable System Sensor protocols and control panels from Honeywell brands such as Fire-Lite, Notifier, and Silent Knight. This makes it a versatile choice for professionals working with a variety of fire alarm platforms.

Its durable construction ensures long-term reliability, while its intelligent communication allows for advanced diagnostics and system supervision.

The System Sensor M501M Monitor Module offers dependable monitoring for dry-contact devices in addressable fire alarm systems. With a small footprint, fast response capabilities, and seamless integration across Honeywell-compatible platforms, it supports accurate detection and efficient system expansion. For projects requiring precise, space-saving input supervision, the M501M delivers performance and ease of use.