The Model 880-NSL utilizes non-dispersive ultraviolet (UV) spectroscopy to deliver highly accurate, real-time measurements crucial for maintaining optimal air-to-acid gas ratios in the Claus process. Standard Specification Details Non-dispersive ultraviolet (UV) spectroscopy Standard Measurement Ranges Measurement Accuracy of full scale concentration Speed of Response of full scale change in less than 15 seconds Linearity & Repeatability Linearity: of span | Repeatability: of full scale Analog Signals Three (3) self-powered, linear 4-to-20 mA outputs ( maximum load) Digital Communication RS-485 serial communication port Enclosure & Protection

The controller also has four security levels (0 to 3) to protect critical settings. Access codes prevent unauthorized changes to configurations. The default factory access codes are listed in the manual.

The 880-NSL uses field-proven, non-dispersive ultraviolet (UV) technology to measure H₂S and SO₂ concentrations simultaneously. A high-intensity pulsed xenon flash lamp directs UV light through a sample cell containing the gas mixture. Specific wavelengths—254 nm for H₂S and 280 nm for SO₂—are absorbed by the gas molecules. Precision optical filters and solid-state silicon photodiode detectors convert the remaining light into electrical signals. A microprocessor uses the Beer-Lambert law to calculate gas concentrations based on the amount of light absorbed. Measurements typically complete in about 10 seconds, with a very fast response time, reaching 90% of final value in under 15 seconds.

The primary focus of the 880-NSL manual is its ability to eliminate sample line plugging—a frequent failure point in Claus sulfur recovery plants. Direct Mounting:

The is designed to provide high-reliability, real-time analysis of tail gas components without the need for complex, heated, or long sample transport lines. By utilizing a non-dispersive ultraviolet (NDUV) photometric technique, it ensures fast response times—typically 90% in less than 10 seconds.

Warning: Ensure the calibration gas lines are heated or handled according to the manual's safety guidelines to prevent gas stratification or condensation. Troubleshooting Common Fault Codes and Errors