Patent ID: 8464572

Claim:
A system comprising: a signal source configured to provide a first signal for measuring a gas content of a liquid sample; an analyzer configured to determine the gas content of the liquid sample using a measurement of a second signal, the second signal based on the first signal; and an apparatus comprising: a walled structure having a cavity; a piston configured to (i) pull the liquid sample into the cavity and (ii) push the liquid sample out of the cavity, wherein the piston comprises a piston head having a reference material; and at least one measurement window having at least one inner surface exposed within the cavity, the at least one measurement window configured to (i) receive the first signal from the signal source and (ii) provide the second signal to the analyzer; wherein the signal source is further configured to provide a third signal to the at least one measurement window when the reference material is aligned with the at least one measurement window; and wherein the analyzer is further configured to be calibrated using a measurement of a fourth signal, the fourth signal comprising the third signal after the third signal has interacted with the reference material.