Direct-reading concrete gas content measuring instrument is used to measure the gas content in concrete mixtures. It is suitable for concrete with aggregate particle size greater than 40mm, gas content not greater than 10%, and slump. The body of the direct-reading concrete gas content tester is made of all-aluminum casting, shockproof and waterproof pressure gauge, which is especially suitable for field operation tests.
★ Volume: 7 liters
★ Gas content range: ≤10%
★ A large particle size of coarse aggregate: ≤40mm
★ A small reading: 0.1%
★ Design A high pressure: 4MPa
★ A high working pressure: 0.4MPa
★ Airtightness test pressure: 0.4MPa
★ Weight: 11KG
Third, the working principle:
★ The measuring principle of this instrument is based on the gaseous equation, between the gas chamber that maintains a certain pressure and the container filled with the sample. When the opening and closing pressure is balanced, when the pressure of the two containers reaches equilibrium, the amount of pressure reduction in the gas chamber is the mortar. The percentage of air content in the sample is indicated on the pressure gauge.
★ Direct-reading CA mortar gas content measuring instrument is an instrument for measuring the air content in mortar according to "Temporary Technical Conditions for CRTSⅡ Slab Ballastless Track Cement Emulsified Asphalt Mortar for Passenger Dedicated Railways".
Four, operating procedures:
★ Wipe the inner surface of the measuring bowl and lid with a damp cloth, then load the 砼 sample, and smooth it with a vibration or tamper until there are no air bubbles.
★ The total mass of the container and the tritium sample is then weighed after smoothing.
★ Paste a small piece of thin paper or plastic film on the surface of the diaphragm facing the operation valve hole, clean the flange, cover the measuring bowl cover, tighten the clamp clamp, and open the exhaust valve.
★ Close the operation valve and compress the air from the inlet valve to make the pressure pointer 1Kgf / cm2.
★ Close the operation valve, open the water inlet valve and add a small amount of water, and close the water inlet valve and exhaust valve to make it airtight.
★ Open the operation valve, make the compression vessel in the gas chamber enter the measuring bowl, and after the pressure gauge pointer stabilizes, read the gauge value.
★ The measuring bowl is precision cast with aluminum alloy acid and alkali resistant material. The structure is rigorous and the volume is accurate to ensure the reading of the measured value.
★ Directly read out the measured gas content of concrete, the operation is simple and convenient, and the value is accurate, which reduces the tedious drawing of the relationship between the gas content and the pressure gauge value, saving time and effort.
★ Using the refined instrument and device pressure gauge, the safety performance is good, and the dial is clear and intuitive.
★ The sealing ring of each part is made of special sealing material, which has good sealing performance, durability and long service life.
★ The built-in hand pump is light and time-saving.
★ Water injection type measurement, no water injection type measurement.
★ Small size and light weight, easy to carry, suitable for high frequency continuous use on site.