Alphasense IRC-AT
A compact Alphasense NDIR carbon-dioxide sensing cell for OEM instruments spanning indoor air quality, safety, combustion and process measurement.
Key Specifications
Product Positioning
Alphasense positions IRC-AT for OEM instruments that require selective CO₂ measurement across ppm and percent-volume ranges. Range-specific performance values should be selected according to the intended IAQ, safety, combustion or process application.
Official Resources
This page uses current Alphasense manufacturer specifications.
View Official Alphasense Product PageAirAlign is independent of Alphasense and AMETEK. Manufacturer documentation remains authoritative.
Alphasense IRC-AT — thermopile NDIR and analog front-end boundaries — detailed technical comparison and documentation
Manufacturer source data are specific to the selected sensor physics, ordered range and application conditions. Factory product family options do not all apply to a single device.
| Specification | Original maker evidence | Integration/selection qualification |
|---|---|---|
| Detector principle | A-Series NDIR CO₂ with thermopile infrared detector | Different sensor physics and response coefficients from pyroelectric IRC-A1. |
| Separate concentration grades | IAQ 0–5,000ppm; Safety 0–5%vol; Combustion 0–20%vol; Process 0–100%vol | Order code determines practical calibrated range and full-scale uncertainty. |
| Grade-specific error | IAQ ±1%FS; Safety ±1.5%FS; Combustion ±2.5%FS; Process ‘to be confirmed’ on source webpage | Do not invent an accuracy grade for 0–100% process configuration. |
| Resolution at zero and FS | Maker gives IAQ 10ppm/50ppm and combustion 10ppm/2,000ppm respectively | Resolution is not the same as absolute measurement accuracy. |
| Response | T90 under 40s at 20°C | Dust filter, system gas inlet and optical alignment can extend field response. |
| Mechanical mounting | A-Series recommended socket; OEM notes no direct soldering or cutting pins | Check contact integrity and temperature thermal path. |
| Thermal correction | Integrated thermistor plus optional environmental pressure/RH compensation support | Correct temperature and pressure before comparing to a high-grade reference. |
Design, gas calibration and safety boundaries
IRC-AT is a bare thermopile NDIR element for OEM development, not a field transmitter with an I²C/Modbus output on its own. The manufacturer publishes universal linearisation guidance and a distinct thermistor, so complete instrument design must include optical drive, analog readout, calculated transfer function and site calibration. Do not copy IRC-A1’s process ±4%FS claim to IRC-AT because the current IRC-AT maker page leaves process accuracy as to-be-confirmed. Controlling humidity, sample port dust, ambient light and certified instrument housing is equally important.
Primary manufacturer technical reference: Official exact model and current product documentation. Obtain the current order code, calibration datasheet and any region-specific approval before installation.
AirAlign source-backed product engineering notes · 25 October 2026. Neither an independent calibration certificate nor finished gas detector Ex/SIL approval.