Description
Principle of NDIR Gas Sensor
“The basic measurement principle is called nondispersive infrared (NDIR) gas detection, which is based on the absorption of infrared radiation at certain gas specific wavelengths in accordance with the Beer-Lambert law. The most common gases that are measured with this NDIR principle are Advanced NDIR gas sensors provide reliable and precise analysis solutions for gas detection. These sensors utilize the nondispersive infrared (NDIR) gas detection principle, which is based on the absorption of infrared radiation at specific wavelengths in accordance with the Beer-Lambert law. NDIR gas sensors can accurately measure gases such as Carbon Dioxide (CO2), Methane (CH4), Hydrocarbons (HC), Carbon Monoxide (CO), Nitrous Oxide (N2O), and Sulphur Hexafluoride (SF6) are possible to detect.”. The detection of these gases is made possible through the advanced capabilities of NDIR technology.
Working principle of Non-Dispersive Infrared (NDIR)
“A Non Dispersive Infrared (NDIR) gas sensor working principle is based on the property of certain molecules to absorb light at specific wavelengths (or “color”) that are characteristic of their molecular structure. The absorption characteristics are defined as molecular vibrational energies associated with stretching, bending or rotations and depends upon the molecular structure of the gas. For IR energy to be absorbed, that is for vibrational energy to be transferred to the molecules, the frequency must match the frequency of the mode of vibration. Thus, specific molecules absorb IR radiation at precise frequencies and each gas has a unique and well defined light absorption curve in the infrared spectrum.
When IR radiation passes through a volume containing a specific gas, only those frequencies matching the vibration mode are absorbed, while the rest of the light is transmitted without interference. For this reason, the presence of a particular gas gives rise to characteristic absorption bands.”
Features Applications
- Infrared Gas Flow Sensor • Oil & Gas
- Pre Calibrated • Energy
- Compact Design • Medical
- 3/5 mm gas line connector • Smart City Applications
- 12VDC to 28VDC supply voltage • Industrial
- Status indicated by LED • HVAC
- Low drift • High Voltage Switch-gear
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LIST OF NDIR BASED GAS WITH ENVIRONMENTAL CONDITION |
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| Sr. No. | MODEL NO. | GAS NAME | GAS FORMULA | GAS RANGE | RESOLUTION | ACCURACY |
| 1 | SZ-mini-SF6-1000 | Sulphur
hexafluoride |
SF6 | 1000 PPM or more | 1 PPM | <5 % of Reading or ±20 PPM Whichever is More |
| 2 | SZ-mini-SO2-2000 | Sulfur dioxide | SO2 | 2000 PPM | 1 PPM | <5 % of Reading or ±20 PPM Whichever is More |
| 3 | SZ-mini-N2O-1000 | Nitrous oxide | N2O | 1000 PPM | 1 PPM | <5 % of Reading or ±20 PPM Whichever is More |
| 4 | SZ-mini-ETO-5000 | Ethylene oxide | ETO | 5000 PPM | 1 PPM | <5 % of Reading or ±100 PPM Whichever is More |
| 5 | SZ-mini-CO-5000 | Carbon monoxide | CO | 5000 PPM | 1 PPM | < 5% of Reading or ±100 PPM Whichever is More |
| 6 | SZ-mini-CO-10% | Carbon monoxide | CO | 10% V/V | 0.01% V/V | < 3% of Reading or ±0.2% V/V Whichever is More |
| 7 | SZ-mini-CO2-10000 | Carbon dioxide | CO2 | 10000 PPM | 1 PPM | < 5% of Reading or ±30 PPM Whichever is More |
| 8 | SZ-mini-CO2-5% | Carbon dioxide | CO2 | 5% V/V | 0.01% V/V | < 5% of Reading or ±0.5% V/V Whichever is More |
| 9 | SZ-mini-CO2-10% | Carbon dioxide | CO2 | 10% V/V | 0.01% V/V | < 5% of Reading or ±0.5% V/V Whichever is More |
| 10 | SZ-mini-CO2-100% | Carbon dioxide | CO2 | 100% V/V | 0.1% V/V | < 2% of Reading or ±0.5% V/V Whichever is More |
| 11 | SZ-mini-CH4-2000 | Methane | CH4 | 2000 PPM | 1PPM | < 5% of Reading or ±30 PPM Whichever is More |
| 12 | SZ-mini-CH4-100% | Methane | CH4 | 100% LEL | 0.1% LEL | < 2% of Reading or ±0.5% LEL Whichever is More |
| 13 | SZ-mini-CH4-100% | Methane | CH4 | 100% V/V | 0.1% V/V | < 2% of Reading or ±0.5% V/V Whichever is More |
| 14 | SZ-mini-R134a-1000 | Refrigerant | R134a | 1000 PPM | 1 PPM | < 5% of Reading or ±20 PPM Whichever is More |
| 15 | SZ-mini-CH4+CO2 | Methane + Carbon dioxide | CH4+CO2 | 100% V/V | 0.1% V/V | < 2% of Reading or ±0.5% V/V Whichever is More |
| 16 | SZ-mini-C2H4-1000 | Ethylene | C2H4 | 1000 PPM | 1PPM | < 5% of Reading or ±20 PPM Whichever is More |
