Predictive Maintenance with IoT Sensors and AI

The Technology Stack

A production predictive maintenance system has four layers:

1. Sensor Layer (IoT)

Key sensors for manufacturing equipment:

• Vibration sensors (accelerometers): Detect bearing wear, misalignment, imbalance, looseness. The most valuable single sensor for rotating equipment.
• Temperature sensors (thermocouples, IR): Monitor motor windings, bearings, hydraulic fluid, electrical connections.
• Current sensors: Detect motor degradation through current signature analysis (MCSA).
• Ultrasonic sensors: Detect early bearing defects, compressed air leaks, steam trap failures.
• Oil analysis sensors: Monitor contamination, viscosity, and wear particle concentration in real-time.
• Pressure sensors: Track hydraulic system health, filter blockage, pump performance.

Sensor selection depends on equipment type:

• Rotating equipment (motors, pumps, compressors): Vibration + temperature + current
• Hydraulic systems: Pressure + temperature + oil analysis
• Electrical systems: Temperature + current + power quality
• CNC machines: Vibration + spindle current + coolant flow

2. Edge Gateway Layer

IoT sensors generate continuous data streams that must be processed locally before cloud transmission:

• Edge gateways (Raspberry Pi industrial, Siemens IOT2050, or custom): Collect data from multiple sensors, perform initial filtering and aggregation.
• Protocols: MQTT for sensor-to-gateway, OPC-UA for PLC/SCADA integration, Modbus for legacy equipment.
• Local buffering: Store 24–72 hours of data locally in case of network outages.
• Edge inference: Run lightweight anomaly detection models on the gateway for real-time alerts (under 100ms).

3. AI Analytics Layer

The core intelligence that turns sensor data into actionable predictions:

• Anomaly detection: Unsupervised models (Isolation Forest, Autoencoders) learn normal equipment behavior and flag deviations.
• Failure prediction: Supervised models (XGBoost, LSTM neural networks) trained on historical failure data predict remaining useful life (RUL).
• Root cause analysis: Multi-sensor correlation identifies which component is degrading and why.
• Maintenance scheduling: Optimization algorithms balance predicted failure risk against production schedules and spare part availability.

4. Action Layer

Predictions are useless without clear action workflows:

• Alert prioritization: Critical (failure imminent, <48 hours) → Warning (degradation detected, 1–4 weeks) → Advisory (early signs, monitor closely).
• Work order generation: Automatic CMMS integration creates maintenance work orders with predicted failure mode, recommended parts, and estimated repair time.
• Dashboard: Real-time equipment health scores, trend visualization, and maintenance calendar for plant managers.

Training predictive models requires historical data. The challenge in Indian manufacturing:

• Most factories have limited historical failure data in digital format.
• Solution: Start with anomaly detection (no failure data needed), then build supervised models as failures are captured digitally over 6–12 months.
• Transfer learning: Models trained on similar equipment in other facilities can jumpstart predictions with minimal local data.
• Physics-informed models: Combine domain knowledge (bearing life equations, motor curves) with data-driven AI for faster, more accurate predictions.

Textile Manufacturing (Coimbatore)

Critical equipment to monitor:

• Ring spinning frames: Spindle vibration monitoring detects bearing wear 2–4 weeks before failure.
• Air-jet looms: Nozzle pressure and vibration predict breakdowns that cause fabric defects.
• Dyeing machines: Temperature and chemical flow monitoring prevent batch failures.
• Compressors: The backbone of air-jet looms — vibration and temperature monitoring prevents cascading line stoppages.

ROI for a 100-loom weaving unit: Reducing unplanned loom stoppages by 30% increases effective capacity by 8–12% without adding machines — equivalent to adding 8–12 new looms (Rs 80 lakh–1.2 crore in equivalent capacity).

Auto Parts Manufacturing (Bangalore)

Critical equipment to monitor:

• CNC machines: Spindle vibration and current monitoring predicts tool wear and bearing failures.
• Hydraulic presses: Pressure and temperature monitoring detects seal wear and valve degradation.
• Injection molding machines: Screw wear, heating element degradation, clamping force variations.
• Heat treatment furnaces: Temperature uniformity, heating element degradation, fan motor health.

ROI for a 50-CNC shop: Predictive tool replacement alone reduces scrap by 15–20% and increases machine availability by 5–8%.

Food Processing

• Refrigeration compressors: Prevent cold chain breaks that cause product spoilage.
• Packaging lines: Monitor servo motors, pneumatic actuators, and seal bars.
• Cleaning systems (CIP): Pump and valve monitoring ensures food safety compliance.

Phase 1: Foundation (4–6 Weeks)

• Equipment audit: Identify top 5–10 critical machines based on failure history, production impact, and repair cost.
• Sensor selection and installation: Install vibration, temperature, and current sensors on priority equipment.
• Edge gateway deployment: Connect sensors to IoT gateways with MQTT/OPC-UA.
• Baseline data collection: 4–6 weeks of normal operation data to train anomaly detection models.

Phase 2: Intelligence (4–6 Weeks)

• Deploy anomaly detection: Unsupervised models alert on deviations from normal behavior.
• Build dashboards: Equipment health scores, trend visualization, alert management.
• CMMS integration: Connect AI predictions to your maintenance management system.
• Team training: Maintenance team learns to interpret AI alerts and prioritize actions.

Phase 3: Optimization (Ongoing)

• Supervised model training: As failure events are captured, build predictive models for remaining useful life.
• Expand to more equipment: Scale from pilot machines to full plant coverage.
• Spare parts optimization: AI-driven spare parts inventory based on predicted failure timelines.
• Energy optimization: Detect energy-wasting equipment conditions (misalignment, over-lubrication).

• Vibration sensor: Rs 5,000–25,000 per unit (industrial-grade, wireless)
• Temperature sensor: Rs 1,000–5,000 per unit
• Edge gateway: Rs 15,000–50,000 per unit (covers 10–30 sensors)
• Cloud platform: Rs 20,000–50,000/month for 50–200 sensors
• Total for 10-machine pilot: Rs 5–12 lakh

Boolean & Beyond builds predictive maintenance systems for manufacturers in Bangalore and Coimbatore. Our approach is practical — we start with the equipment that hurts you most when it fails, prove ROI on a pilot, and then scale. We handle everything from sensor selection and IoT architecture to AI model development and CMMS integration, so your maintenance team gets actionable predictions, not another dashboard they'll ignore.