Introduction
The Model 100EU Trace Level Analyzer, developed by Teledyne-API in collaboration with the USEPA, is designed for the characterization of SO2 in the national core monitoring network (NCore). It is the first instrument of its kind to receive equivalency from the US EPA, meeting stringent criteria for measuring ultra-low levels of SO2 with minimal interference.

Specifications
- Measurement Ranges: 0-5 ppb to 0-20,000 ppb, user-selectable with dual ranges and auto-ranging capabilities.
- Units: ppb, ppm, mg/m³
- Zero Noise: 25 ppt (RMS)
- Zero Drift: < 0.2 ppb/24 hours
- Span Drift: < 0.5% of FS/24 hours
- Lower Detectable Limit (LDL): 50 ppt
- Response Time: <120 seconds to 95%
- Sample Flow Rate: 650 cc/min ±10%
- Linearity: 1% of full scale
- Operating Temperature Range: 5 - 40˚C
- Dimensions: 7” x 17” x 23.5”
- Weight: 45 lbs (20.5 kg)
- Power: 100V - 120V, 220V - 240V, 50/60 Hz, 250W

Features
- Standard two-year warranty
- Microprocessor-controlled for versatility
- Adaptive signal filtering for optimized response time
- Bi-directional RS-232 ports for remote operation
- Temperature and pressure compensation
- Continuous self-checking with warning alarms

Design and Functionality
The Model 100EU is based on the proven Model 100E SO2 analyzer but is enhanced for ultra-sensitive measurements. It features a synchronized lamp driver with an improved zinc lamp, a reference detector for UV lamp intensity feedback, and a hydrocarbon "kicker" to prevent inaccuracies. The PMT preamp PCA is housed inside the PMT for lower noise and greater stability.

Control and Diagnostics
The analyzer includes multi-tasking software for field range changes, auto-ranging, and dual range operation. It can be controlled via the front panel or remotely through RS-232. Built-in diagnostics and alarms facilitate troubleshooting.

Ordering Information
Options include rack mount brackets, 4-20mA output, multi-drop RS-232 connection, concentration alarms, and an Ethernet port. Accessories such as RS-232 cables and spare parts kits are available.

Conclusion
The Model 100EU combines robust construction, ease of use, and powerful diagnostics, making it an ideal tool for modern air monitoring requirements.