EMS WatchDog PS-1 EPA-Compliant Opacity/Dust Monitor
The EMS WatchDog PS-1 opacity and dust monitor meets or exceeds EPA regulation 40 CFR 60 Appendix B, PS-1, and ASTM D 6216. It is the definition of reliability, featuring an intuitive 5.7” color touchscreen user interface and a long-life, EPA-compliant LED light source.
The EMS WatchDog PS-1 utilizes dual-beam measurement and the highest-quality optics to assure accuracy and dependability. It features an electronically modulated, long-life, EPA-compliant LED light source, which is immune to ambient light and carries a lifetime replacement warranty.
Our 5.7” color touchscreen user interface includes five numeric display screens as well as three trend displays. This control unit performs all vital computations with a resolution of 0.1% opacity and provides outputs correlated to stack exit opacity.
Designed to mimic the ease-of-use of a smartphone, this intuitively designed controller gives the user many options for customization. Some of these options and features include:
- Output Definition Selection
- Password-Protected User and Technician Settings
- Real-Time Diagnostics (Sensor Simulation, Color-Coded Relay, and Fault Status)
- Selectable Auto-Cal Frequency
- Manual Calibration Initiation
- Selectable Early Warning and Delay Values
- Window Dust Alarm
The sensor and reflector are housed in NEMA 4 watertight enclosures and are designed to swing away from the air plenum for easier installation and service. Alignment adjustments use the EMS “Through the Lens” system with an integral three-point adjustment.
The smart service module in the stainless-steel weather cover passes signals between the transceiver and control unit, initiates maintenance zero and span cycles, and displays important information at the mounting location. This supports troubleshooting without requiring a second technician at the controller.
EPA-Compliant Continuous Opacity Monitoring
The WatchDog PS-1 is designed for facilities that require a continuous opacity monitoring system (COMS) for stack-opacity measurement under U.S. EPA 40 CFR Part 60, Appendix B, Performance Specification 1. Its dual-beam optical design, automatic zero and span functions, 0.1% opacity resolution and stack-exit-correlated outputs support accurate measurement, compliance documentation and process visibility.
WatchDog PS-1 Specifications
| Measurement method | Dual-beam opacity and dust measurement |
|---|---|
| Compliance | Meets or exceeds 40 CFR Part 60, Appendix B, PS-1 and ASTM D6216 |
| User interface | 5.7-inch color touchscreen with five numeric screens and three trend displays |
| Resolution | 0.1% opacity |
| Analog output | 4–20 mA |
| Stack-to-controller communication | RS-485 |
| Light source | Electronically modulated, long-life EPA-compliant LED with lifetime replacement warranty |
| Calibration functions | Automatic and manually initiated zero/span checks |
| Sensor and reflector enclosures | NEMA 4 watertight enclosures with swing-away mounting |
| Alignment | Through-the-lens, three-point adjustment |
PS-1 Applications and Compliance Support
The WatchDog PS-1 is intended for industrial stacks and ducts where operators need continuous opacity measurement, trend information, alarm thresholds and documented performance under applicable air permits. EMS also provides startup, certification, quarterly audit and neutral-density-filter services to support ongoing compliance.
Frequently Asked Questions
Which standards does the WatchDog PS-1 address?
The system meets or exceeds U.S. EPA 40 CFR Part 60, Appendix B, Performance Specification 1 and ASTM D6216.
What information is available on the controller?
The 5.7-inch color touchscreen provides five numeric display screens, three trend displays, real-time diagnostics, relay and fault status, and selectable user and technician settings.
How does the PS-1 communicate with other equipment?
It uses RS-485 communication between the stack equipment and controller and provides a 4–20 mA analog output for compatible plant systems.
How is routine maintenance simplified?
Swing-away NEMA 4 enclosures, through-the-lens alignment and the stack-mounted smart service module help technicians perform alignment, zero/span functions and troubleshooting efficiently.
PS-1 Documents, Audits and Service
Download the WatchDog PS-1 data sheet. Learn about opacity-monitor service, startup and certification or audit neutral-density-filter certification. For configuration assistance and pricing, contact EMS.
Contact us for a quote or more information.
