The Michell Instruments S8000 chilled mirror hygrometer provides a direct measurement of dew point, temperature and pressure based on the proven, fundamental optical chilled mirror measurement principle, giving long-term, drift-free humidity measurement over the entire operating range . The S8000 uses this measurement to offer a range of available measurement units including ppmv, absolute humidity, relative humidity and ppmw.

The S8000 uses the RRS optical system to detect very small changes in the quantity of moisture condensed on the mirror surface, resulting in very high sensitivity and fast response to changes in frost point, even at low levels of moisture . The instrument features frost assurance technology (FAST) that guarantees all dew point measurements below 0°C are made over ice by detecting and cooling supercooled water until ice forms. The DCC (Dynamic Contamination Correction) system periodically rebalances the optics to compensate for any reduction in light intensity caused by contamination, maintaining optimum measurement performance .

To further improve accuracy of pressure-derived calculated values, an optional internal pressure transducer can be supplied for real-time pressure compensation during sample pressure fluctuations. A pair of adjustable, isolated alarm contacts allows direct process control. A high-contrast touch screen LCD display provides entirely customizable local indication of measured values, trend graph, and fault warnings. The instrument features USB, Ethernet, RS485 or RS232 connectivity and datalogging to SD card or via digital communications .

Key Features

• Dew point accuracy: ±0.1°C (±0.18°F)
• Reproducibility: ±0.05°C (±0.09°F)
• Measurement range: -60 to 40°C (-76 to 104°F)
• RRS optical system for high sensitivity
• FAST (Frost Assurance Technology) guarantees measurements over ice
• DCC (Dynamic Contamination Correction) maintains optimum performance
• Optional internal pressure transducer for real-time compensation
• USB, Ethernet, RS485, RS232 connectivity
• SD card data logging
• Adjustable isolated alarm contacts
• High-contrast touch screen LCD with trend graph and fault warnings
• Low pressure (14.5 psig) and high pressure (290 psig) versions

Applications

• Standards laboratory reference instrument
• Transformer vacuum drying verification
• Clean/dry room environmental monitoring
• Metallurgical process monitoring
• Reference instrument for commercial calibration laboratory
• Compressed air dryer R&D
• SF₆ switchgear moisture testing
• Hydrogen fuel cell R&D