Non-dispersive infrared (“NDIR”) sensors are potentially low-cost (<$100), ultra low-power (<5 mW) sensors that are designed to monitor the concentration of various gases for an extended period of time, > 10 years, on a single battery charge. NDIR sensors are using proprietary mid-IR LED-receiver pairs that are tuned to the absorption spectrum of the gas of interest. This NDIR technology has applicability to a variety of NDIR gas sensors for mobile and stationary leak detection, air quality monitoring and industrial processing.
Ultra-low-power Series 5 NDIR methane sensors developed at BAH
Ultra-low-power Series 5 NDIR methane sensor integrated with SilverSpring AMI modem. The unit is being used in ConEdison field tests on BAH sensing technology.
|Sensing Gas||Methane (CH4)|
|Operating Principle||Non-dispersive infrared (NDIR)|
|Voltage, source||3.0 – 3.5 Vdc; 3.3 Vdc typical|
|Average Current||1 mA, typical|
|Averge Power||3 mW, typical|
|Detection Range||0-100%LEL or 0-100% Methane volume|
|Methane Concentration Units||%LEL (500 ppm)|
|Warm-up Time||10 sec|
|Response Time (T90)||30 sec|
|Temperature Range||-30C to 65C|
|Humidity Range||0 to 90% RH|
|Communications||UART, logic levels on TX and RX|
|Dimensions|| 45 mm diameter X 38 mm height |
The following figures show typical performance of a low-power compact methane sensor.
Response of the sensor to change of the methane concentration in air.
Dependence of the optical absorption signal on the methane concentration.