The permanently aligned gas cells have transfer optics, valves, pressure gauge (10 meter only) and Swagelok® valves and connections and a flow-through tube. The cells come assembled with Potassium Bromide (KBr) windows and black anodized aluminum mounting hardware. The cells are vacuum tight. The 2.4 Meter Gas Cell (0008-4275) and the 4.8 Meter Gas Cell (0008-4276) have black anodized aluminum hardware, borosilicate glass cell bodies and Swagelok® valves and connections. The 10 Meter Gas Cell (0008-4277) has a 4” inside diameter cell body. All permanently aligned long path gas cells have gold coated mirrors with a non-absorbing protective coating. Transfer Optics are KBr windows. The two mirror system couples the optical radiation in and out of the cell with good optical throughput for most analytical gas applications. Ask for a quotation on custom sizes, stainless steel bodies, or laser alignment systems.