激光原理二氧化碳传感器，价格低廉质量稳定

IRIS 7P NDIR sensor for CO2 or CH detection

Standard sensor size • Fast response • Internal temperature signal • Robust construction • Temperature compensated detector elements • Wide operating temperature and humidity range • Low power consumption IRIS 7P NDIR sensor for CO2 or CH detection Fe

The IRIS series of infrared gas detection sensors are using the technique NDIR (Non Dispersive Infrared) to monitor the presence of hydrocarbons or carbon dioxide. The sensor consists of an infrared light source, an optical cavity, a dual output pyroelectric detector, a thermistor to monitor the temperature and the appropriate electronics. The gas diffuses into the optical cavity through a special Goretex® membrane designed to enhance the ingress protection (IP) of the sealed enclosure. Inside the cavity the lamp emits an infrared pulsing radiation that gets partially absorbed by the present gas. The pyroelectric detector is sensitive to thermal energy changes and returns two outputs in response to the pulsed light from the infrared light source: • an active sinusoidal signal output that decreases in amplitude when the target gas is present in the cavity • a reference sinusoidal signal output that measures the light intensity of the infrared source (this signal remains unaffected by the presence of target gas) An IR gas sensor naturally senses temperature by absorbing radiation but it also responds to temperature changes in the environment which can give rise to spurious and misleading signals. For this reason an NTC thermistor is implemented to measure the internal temperature of the sensor. The IRIS 7P sensor needs to be provided with suitable electronic and software interfaces in order to produce an output that is linearized and temperature compensated.

perating temperature range 40 to +50 °C Operating humidity range 095% non condensing Gas types CH4 or CO2 Weight 44 grams MTBF ≥ 5 years Measurement Sensing method NDIR Measurement range 0100% LEL; 0100% vol (CH4) 05000 ppm; 05% vol; 0 – 100% vol (CO2) Repeatability <±2% of range Resolution <2% of range Long Term Drift <±3% of range/year Response time T90 <40 secs in target housing with 3mm 120um sinter Power voltage 5 V dc on pin Vdd EMC Designed for use in a detector which complies to EN 50270 Lamp Power Voltage 0 5V (50% dutycycle) on pin Lamp+ Power requirements 0 60mA max (50% dutycycle). Drive frequency 2.0 Hz minimum 3.0 Hz typical 4.0 Hz maximum. Signal Output Pinout format 7 pins standard for base form Active pkpk out @ 0 gas 4,5 mV @ 3 Hz (for CH4 sensor) 4 mV @ 3 Hz (for CO2 sensor) Reference pkpk out @ 0 gas 2 mV @ 3 Hz Electrical S