A pump for a gas sampling or analyzing system includes a pump body having
walls impervious to the gas and an electrical coil within the body. The
pump is coupled in series with a gas sensor and a gas volume containing
the gas to be sampled or analyzed. By varying the amplitude of either the
AC or DC current supplied to the coil, the temperature of the coil and,
hence, the temperature of the gas within the pump can be varied, causing
the pump to "inhale" upon lowering the temperature of the gas within the
pump and "exhale" upon raising the temperature of the gas within the
pump, thereby enabling the gas from the gas volume to be drawn
periodically into and expelled from the sensor for sampling.