LJ Star Catalog

The ability to see what is happening inside a pipe can be invaluable to process operators. Despite technological advances, no sensor can equal the human eye which has more than 94 million photo receptors. 

Process observation equipment falls into two major categories: sight glasses, also called sight glass windows, which are used on process vessels, and sight flow indicators, which are used in process pipelines. This white paper covers the latter. (For information on sight glass windows, see our Chemical and Pharmaceutical Sight Glass Application Handbook.) 


A sight flow indicator is a device installed in a pipe to provide a visual means of verifying liquid flow for direction and approximate rate. Simple and low-cost, it also allows operators to observe the color and clarity of process fluids through a window. 

Sterile Visual Flow Indicator for Pharmaceutical Processing

LJ Star's innovative Clamp Type Sterile Visual Flow Indicator (CT-SVFI) is a patent-pending solution designed to eliminate contamination in pharmaceutical processing. 

Featuring sanitary clamp-based assembly instead of traditional threads, this product delivers precise o-ring compression that prevents bacterial contamination, bacterial buildup, and cleaning challenges. With a 34% larger viewing area, 316L stainless steel construction, and available in sizes 1/2" to 4", it's certified for FDA, USP Class VI, and European standards. 


Perfect for pharmaceutical, biotech, and food/beverage processing applications requiring reliable in-line process monitoring.