I am interested to use a pyrometer to measure the temperature of a graphite heater while it is being heated (upto 1200 degC). The heater is located inside a small chamber filled with liquid cyclohexane . For viewing purpose of the pyrometer the chamber is having a viewport of Quartz. The pyrometer can sense wavelength in the range 2 - 4 micron. I am interested to know whether cyclohexane will transmit the IR radiation to pass through the quartz viewport upto the pyrometer. Will appreciate a reply in this regard.