Unitec - SENS-IT

General Description

The SENS-IT (TF-MOS: Thick Film Metal Oxide Semiconductor) measures CO (carbon Monoxide) (0.1-80 ppm), NO₂ (nitrogen dioxide) (10-250 ppb), O₃ (ozone) (10-250 ppb), C₆H₆ (benzene) (0.1-30 ppb) and CH₄ (methane) (1-1,500 ppm).

Principle of Operation

The active surface of the sensor is based on a specific nano-structured semiconductor metal oxide. The first reaction which happens on the surface of the sensor is the adsorption of atmospheric oxygen with consequent charge transfer from semiconductor to oxygen molecules. The second reaction is related to specific gas to monitor, which while reacts with adsorbed oxygen (through Red-Ox reactions) allows the electrons to be released in the conduction band of the semiconductor. Taking the current signals from the sensors during these reactions, the direct concentration of the specific gas can be measured. Selectivity and sensitivity are reached using special doped semiconductor metal oxides.

Features

• Dimensions: 50 x 50 x 90 (H) mm
• Weight: 200 g
• Battery: No
• Power supply: Yes (+12 V DC)
• Power consumption: 3.0 - 4.0 W
• Sensor lifetime: N/A
• Clock function: No (No internal clock, must be connected to computer for time/date stamp)
• Sampling mechanism: Fan
• Environmental operating conditions: N/A
• PC data logging: Yes (USB to RS485 cable)
• Signal Output: Linear 0-5 V / Digital RS485
• Weatherproof: No

Applications

   •  Urban and industrial area monitoring
   •  Fence-line monitoring
   •  Mobile monitoring application

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