Measuring instrument for free gas content in liquid

The utility model relates to a measuring instrument for free gas content in liquid, which belongs to a gas content testing device and is composed of a barrel body 5, an upper cover 4, a lower cover 9, a piston 6, a screw rod 15 and a handwheel 13. The utility model is characterized in that an exhaust valve 3 is connected to the upper cover 4, a gas chamber 1 is arranged in the barrel body 5, a clamp nut 16 is embedded in the lower cover 9, a dial 18 and a dial clamp nut 17 are externally connected with the lower cover, the dial 18 is positioned between the lower cover 9 and the dial clamp nut 17, the dial 18 is in clearance fit with the lower cover 9, and a pointer 11 is assembled on the handwheel 13. By adopting the operation principle of air compression method, people can intuitively learn about the pressure change in the instrument through observing the change of the gas volume in the gas chamber and read data on the dial 18 as a result of the position change of the pointer 11 on the handwheel to calculate the gas content in the liquid. The measuring instrument has the advantages of simple structure, convenient use and high accuracy, is particularly suitable for testing the gas content in slurry in the pulping process of paper industry, and also can be applied to the detection of free gas content in regular liquid or liquid containing solid mixture.