The Model HC2930 is a fixed wavelength IR spectrophotometer designed to perform repetitive quantitative analysis of total hydrocarbons dissolved in non-absorbing solvent. Both volatile and nonvolatile oily samples can be analyzed using EPA methods 413.2 and 418.1. The instrument accommodates standard IR Grade cuvettes and holders (see Hydrocarbon Test Kit) of up to 100mm. Using a 100mm cell in the concentration expansion mode permits analysis of hydrocarbon levels as low as 0.05 ppm.