HSI Sensing announced at Global Security Exchange (GSX) that its high-security sensors product line —Sentinel— now includes retrofit models. Sentinel Retro is compliant with existing models on the market to facilitate the ease of replacing outdated sensor technology with the newest innovations from HSI. HSI launched its Sentinel sensors line in 2017 as an enhanced technology for high-security intrusion detection. Sentinel sensors utilize Solid State technology and are designed with a wide range of anti-tamper features.