VICI Metronics’ Dynacalibrator Model 150 is a constant-temperature system designed to generate precise PPM or PPB concentrations of chemical compounds in a gas stream, using permeation devices as the trace gas source. It is used as a reference for the calibration of gas chromatography instruments and in other instruments that measure gas concentrations. This portable and lightweight unit is a compact, full-featured calibrator capable of delivering the precise concentrations required. A passivated glass-coated permeation chamber houses the permeation device(s), with measured inert carrier gas sweeping the calibration gas/vapor from the chamber. The digital temperature controller maintains the chamber temperature at a set point with an accuracy of +/- 0.01 C, traceable to NIST standards. The wide range of temperature settings (5 C above ambient to 110 C) means the end-user can generate a range of volumetric concentrations for both low and high vapor pressure chemical compounds, establishing or changing the desired volumetric concentration by varying the carrier flow. Reduced flow path volume permits the use of mercury and other difficult standards.