State-of-the-art infrared measuring technology for gas pipeline testing applications. The DP-IR (Detector Pac-Infrared) uses advanced optical technology to achieve a detection sensitivity of 1 ppm by means of IR-CIPS (Infrared Controlled Interference Polarization Spectrometry). This innovative device combines the excellent measuring properties of an FID with the ease of use of gas-sensitive semiconductor systems.  Moreover, is does not require fuel gas and is selective to methane. This technology is establishing itself in network survey applications alongside traditional measuring techniques.  Distinguishing features of the DP-IR include its mechanical robustness and ease of use.