This document describes a microcontroller-based gas flow alert system for an industrial furnace. The system monitors the furnace's gas flow mode (manual vs automatic) and uses a GSM modem to send alert messages if the mode is not changed on schedule. This helps reduce wasted nitrogen gas flow and lower production costs by ensuring the optimal gas flow level is maintained based on whether items are actively being loaded into the furnace. The system was designed and assembled with a microcontroller board connected to a GSM modem. It provides alerts if the operator fails to change the furnace mode between shifts, allowing nitrogen usage and costs to be reduced by an estimated Rs. 10,407.93 per month.