Automated Exhaust Control and Runtime Tracking for Reflow Oven with Linortek eIO-CPU Ethernet I/O Controller
Background: When Legacy Systems Create Modern Problems
Manufacturing facilities often face a common dilemma: how to improve safety and operational efficiency without overhauling expensive existing equipment. This challenge becomes particularly acute in environments using gas-powered industrial ovens, where worker safety and equipment maintenance are both critical concerns.
For many facilities, the infrastructure constraints of legacy systems mean that obvious solutions—like installing new control systems or modifying equipment—aren’t financially viable. The question becomes: how can you achieve modern automation benefits while working within the limitations of existing infrastructure?
This case study demonstrates how one facility solved both safety and maintenance challenges simultaneously using intelligent automation that respected their existing equipment and budget constraints.
Client Overview: Manufacturing Plant Seeks Smart Solutions
A facilities engineer contacted Linortek support with a specific challenge. Their facility operated multiple gas-powered reflow ovens that were essential to their production process, but these ovens presented both safety risks and maintenance tracking difficulties.
The facility’s constraints were typical of many industrial operations:
- Limited budget for equipment modifications or replacements
- Existing electrical infrastructure that couldn’t easily accommodate new control systems
- Production schedules that made extensive downtime for modifications impractical
- Regulatory requirements for worker safety that needed to be addressed
The engineer knew they needed automated solutions for both safety and maintenance, but traditional approaches would require significant infrastructure changes—something that wasn’t feasible given their operational and financial constraints.
The Challenge: Dual Problems Requiring Creative Solutions
The facility faced two interconnected challenges that affected both worker safety and operational efficiency:
Safety Risk: Dangerous Gas Exposure
The reflow ovens’ internal exhaust systems weren’t designed to direct gas completely outside the building. When oven cycles completed and the top opened, residual gas was released directly into the workspace. This created several problems:
- Immediate health impacts: Workers experienced dizziness, headaches, and discomfort from gas exposure
- Long-term health concerns: Regular exposure posed potential risks to worker wellbeing
- Productivity issues: Workers had to wait for gas to dissipate or avoid the area entirely
- Compliance concerns: The situation potentially violated workplace safety standards
The existing ventilation system required manual activation and wasn’t synchronized with oven cycles, making it ineffective at preventing gas exposure during the critical moments when ovens opened.
Maintenance Tracking: Flying Blind on Equipment Health
Without automated runtime tracking, the facility struggled with maintenance planning:
- Reactive maintenance: Equipment failures caught them by surprise, causing unplanned downtime
- Inefficient scheduling: Maintenance was calendar-based rather than usage-based, leading to over-maintenance or under-maintenance
- Cost implications: Both unexpected breakdowns and unnecessary maintenance visits increased operational costs
- Documentation challenges: Manual tracking was unreliable and time-consuming
Since 90% of industrial equipment maintenance should be based on actual runtime hours rather than calendar schedules, the lack of automated tracking was a significant operational weakness.
Infrastructure Constraints: The Real Challenge
The biggest obstacle wasn’t identifying what needed to be done, but finding a way to do it within existing limitations:
- No budget for oven modifications: Retrofitting the ovens with new control systems wasn’t financially viable
- Limited electrical modifications: The existing wiring and control panels couldn’t easily accommodate new hardware
- Minimal downtime tolerance: Any solution needed to be implemented without disrupting production schedules
- Integration requirements: New systems needed to work with existing equipment without conflicts
The Solution: Intelligent Automation with eIO-RTU
Linortek’s eIO-RTU Ethernet Remote Terminal Unit provided the perfect solution by leveraging existing electrical signals to create intelligent automation without modifying the ovens themselves.
Why eIO-RTU Was the Right Choice
The eIO-RTU’s capabilities aligned perfectly with the facility’s constraints and requirements:
Web-Based Configuration: No special software installation required—everything could be configured through a standard web browser, simplifying deployment and reducing IT overhead.
No-Code Logic Building: The intuitive “IF…THEN” task builder allowed complex automation logic to be created without programming expertise, enabling quick setup and future modifications.
Modular Design: DIN rail mounting integrated seamlessly with existing electrical panels, and the expandable design meant the system could grow with future needs.
Hour Meter Software: Dedicated runtime tracking functionality eliminated the need for separate monitoring equipment.
Multiple I/O Options: Sufficient inputs and outputs to handle both current monitoring and exhaust fan control in a single system.
How the Solution Works: Smart Monitoring and Control
The eIO-RTU system monitors electrical signals from the existing oven systems and uses that data to trigger automated responses. Here’s how each component functions:
Current Monitoring for Runtime Tracking
Current Sensor #1 is installed on the oven’s main power line using a non-invasive current transformer. This sensor:
- Detects oven operation by monitoring current draw changes
- Triggers the hour meter automatically when the oven starts its cycle
- Stops tracking when the current drops below the operating threshold
- Logs precise runtime data for maintenance planning and equipment lifecycle management
The beauty of this approach is that it requires no electrical modifications to the oven—the current sensor simply clamps around the existing power cable.
Smart Exhaust Fan Control
Current Sensor #2 monitors the power line that controls the oven’s internal exhaust system. This creates intelligent automation:
- Detects internal exhaust activation which signals that the oven cycle is completing
- Automatically triggers external exhaust fan to begin venting residual gas
- Provides timed operation with programmable delays to ensure complete gas removal
- Coordinates with oven operations without requiring any communication between systems
This approach is particularly clever because it uses the oven’s own internal exhaust system as a trigger, ensuring perfect timing without needing to modify the oven’s control systems.
Intelligent Logic Processing
The eIO-RTU processes these inputs through its built-in logic engine:
- Conditional responses based on current thresholds and timing
- Multiple task coordination to handle both runtime tracking and safety functions
- Customizable delays and timing to optimize performance for specific equipment
- Real-time web monitoring allows facility managers to observe system operation from any location
Data Management and Accessibility
The system provides comprehensive data management:
- Automatic data logging with timestamp precision for audit trails
- Web-based dashboards accessible from any device with network access
- Integration capabilities for connecting with existing CMMS or facility management systems
- Local data storage ensuring data security and eliminating monthly fees
How It Works
Current Sensor #1 monitors the oven’s power line to detect operation and automatically triggers the built-in hour meter for precise runtime tracking.
Current Sensor #2 detects when the oven’s internal exhaust activates at cycle end, automatically triggering the external exhaust fan to safely vent residual gas before the oven opens.
Web-Based Configuration made setup simple using the eIO-RTU’s browser-based interface—no special software required.
Key Configuration Steps
- Four Logic Tasks created using the intuitive “IF…THEN” task builder:
- Start/stop hour meter based on oven power consumption
- Activate external fan when cycle nears completion
- Deactivate fan with 10-second delay after exhaust system stops
- Dual Current Inputs configured to monitor both oven operation and internal exhaust system
- Hour Meter Function enabled to automatically log operational uptime for maintenance planning
Results: Immediate Impact
✅ Enhanced Safety – Automated fan control eliminated gas exposure risks
✅ Maintenance Visibility – Accurate runtime data enables proactive servicing
✅ Zero Infrastructure Changes – Full functionality using existing wiring
✅ Fast Implementation – System configured and operational in minimal time
Customer Feedback
“We didn’t think automated ventilation and runtime tracking was possible without changing our oven setup. Linortek’s support team helped us make it work with what we had. The system runs reliably, and we’ve solved a serious safety issue without added complexity.”
Why eIO-RTU Made the Difference
- No-Code Configuration: Built-in task builder eliminated programming complexity
- Modular Design: DIN rail mounting integrated seamlessly with existing systems
- Dual Functionality: Combined safety automation with maintenance tracking in one solution
- Web-Based Access: Monitor and manage from any browser without additional software
Perfect for Hour Meter Applications
This case study demonstrates how the eIO-RTU’s built-in hour meter functionality extends equipment life and prevents costly breakdowns—core benefits of Linortek’s hour meter product line. Unlike wireless solutions that may have connectivity limitations, the eIO-RTU provides reliable Ethernet-based monitoring ideal for critical safety applications.
Ready to automate your equipment monitoring? The eIO-RTU offers the same powerful hour meter capabilities with enhanced I/O flexibility for complex automation requirements.
Contact us today to see how Linortek solutions enhance your operation.
