The Optris ACCTAP air purge collar is available in four different styles. Model ACCTAP is designed for heads with optical resolution ≥10:1. It has a 3 x 5mm hose connection, M5 thread, and fits to the mounting bracket. The ACCTAP2 is designed for heads with optical resolution ≤2:1. It has a 3 x 5mm hose connection, M5 thread, and fits to the mounting bracket. Neither are suitable for 32mm heads.
Model ACCTAPL is a laminar air purge collar. It features a side air outlet to prevent cooling, with a 3x5mm hose connection and M5 thread. ACCTAPLCF is a laminar air purge collar with an integrated CF-lense. The Optris ACCTMG mounting fork is suggested for laminar models.