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Sentinel CPPM-4 CO2 Controller The CPPM-4 controls your carbon dioxide levels with part-per-million accuracy. It uses a CO2 sensor that is extremely accurate and features a ten-year life expectancy. The combination CO2 and light level sensor is housed in a separate remote sensor enclosure that can also be connected to other controllers so that the CO2 is disabled (useful when operating exhaust fans). It can be operated in fuzzy-logic mode (for compressed CO2) or on-off (for CO2 generators). One touch calibration of the CO2 sensor. Simple push buttons to enter desired PPM settings and display the current CO2 PPM readings. Can be operated in "Fuzzy Logic" mode for compressed CO2 or On/Off for CO2 generators. Optional 12 volt DC adaptor allows for coordination with other controllers like the EVC-2. The supplied 12 volt power supply connects to any temperature controller so that the CO2 device will be disabled when the fan is operating. Remote CO2 and light level sensor can be positioned inside the area and the CPPM-4 outside of the area. Product ID: EC-CO-CPPM-4 Category: Environmental Control-CO2 Equipment-CO2 Monitor & Control Price:  $659.95 Sale Price: $579.96 Savings: $79.99 Quantity

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