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Description
Johnson Controls offers a complete line of Carbon Dioxide (CO₂) transmitters for measuring and transmitting CO₂ levels, ranging from 0 to 2,000 parts per million (ppm)，within Heating, Ventilating, and Air Conditioning (HVAC) applications. These compact, duct mounted devices offer a choice of 0 to 10 V or 0 to 20 mA output signals and feature an oprional relay output with or without a digital display. Johnson Controls CO₂ transmitters are easy to install and to operate.
The silicon-based CARBOCAP sensor delivers high accuracy and long-term measurement stability over a five-year period without calibaration. the diffusion-aspirated, single-beam, dual-wavelength sensor structure is remakarbaly simple. It consists of an infrared source, a sample cell, an IR detectou, and a tunable interference filter that enables measurements at two wavelengths.
Reference measurements made using a tunbale interference filter eliminate the typical weakness of dual-beam sensors and permits shifting the optical pass band electronically. This innovative design provides precise reference readings that eliminate the tyically broad deviation expexted from a traditional CO₂ sensor.
