Profile: Timberline Instruments, LLC manufatures ammonia & nitrate analyzers, HPLC column heaters, and mobile phase pre-heaters. The TL-2800 ammonia analyzer / nitrate analyzer is a continuous flow system for the detection and analysis of inorganic nitrogen in aqueous solutions with ppb sensitivity. The TL- 600 mobile phase heater is used to heat the mobile phase before it enters a semi-preparative or preparative HPLC column. Controlling column temperature improves retention time reproducibility for individual sample components. It accommodates mobile phases flowing as fast as 100mL/min and temperatures as high as 80°C. The heating unit consists of two lengths of tubing cast into a solid metal block. The metal alloy block provides excellent temperature stability and efficient heat transfer. The tubing is coiled in a unique pattern that minimized the size and weight of the unit and reduces band broadening.