一、产品简介：

石膏保水率测定仪是**检测仪器，依据中华人民共和国国家建材行业标准《粉刷石膏》（JC/T517-2004）而研制的用来检测粉刷石膏的保水率的测定，同时也可用于水泥、砂浆保水率试验。

Product introduction:

Gypsum water retention tester is a testing instrument. It is developed in accordance with the National Building Material Industry Standard of the People's Republic of China "stucco plaster" (JC / T517-2004) to measure the water retention rate of stucco plaster. It can also be used for cement, Mortar water retention test.

二、技术参数：

♦布氏漏斗，内径150mm，深65mml，孔径2mm，孔数169个。

♦耐震真空表0至0.1MPa

♦真空泵负压可达0.1MPa

♦T型刮板，由厚为1mm的硬质耐磨材料制成。

♦抽滤瓶5000ml。

♦电源电压:220V   50Hz.

♦外形尺寸:700×400×600mm

♦功率：200W

♦净重：30Kg

Technical parameters:

♦ Brinell funnel, inner diameter 150mm, depth 65mml, hole diameter 2mm, number of holes 169.

♦ Seismic vacuum gauge 0 to 0.1MPa

Vacuum pump negative pressure can reach 0.1MPa

♦ T-type scraper, made of hard wear-resistant material with a thickness of 1mm.

♦ 5000ml filter bottle.

Power supply voltage: 220V 50Hz.

Dimensions: 700 × 400 × 600mm

♦ Power: 200W

♦ Net weight: 30Kg

三、实验步骤：

A、按布式漏斗内径裁剪中速定性滤纸一张，将其铺在漏斗底部，滤纸和滤纸用水浸湿。将布式漏斗放在抽滤瓶上，开启真空泵，抽滤一分钟，取下布式漏斗，用滤纸将下口残余供应商上海荣计达实验仪器有限公司的水擦净后称量(G1),精确至0.1克。

B、采用具有标准扩散度用水量的石膏浆放入称量后的布式漏斗内，用T型刮板在漏斗中垂直旋转刮平，使料浆厚度保持在（10±0.5）mm范围内，擦净布式漏斗内壁上的残余石膏浆，称量(G2)，精确至0.1克。从搅拌完毕到称量完成的时间间隔不应大于5分钟。

C、将称量后的布式漏斗放到抽滤瓶上，开动真空泵。在三十秒之内将负压调至（53.33±0.67）kpa.抽滤20分钟，然后取下漏斗，用滤纸将下口残余水擦净，称量(G3)，精度0.1克。

若连续两次测得的保水率与其平均值的差不大于3%，取该平均值作为试验的保水率，否则应该重做试验。

Third, the experimental steps:

A. Cut a piece of medium-speed qualitative filter paper according to the inner diameter of the cloth funnel, spread it on the bottom of the funnel, and wet the filter paper and filter paper with water. Place the cloth funnel on the suction filter bottle, turn on the vacuum pump, filter for one minute, remove the cloth funnel, and use a filter paper to clean the water from the remaining supplier Shanghai Rongjida Experimental Instrument Co., Ltd. and weigh (G1 ), Accurate to 0.1 grams.

B. Use gypsum slurry with standard diffusion water into the weighed cloth funnel, and use a T-shaped scraper to rotate and scrape in the funnel to make the thickness of the slurry within (10 ± 0.5) mm. Clean the remaining gypsum slurry on the inner wall of the cloth funnel and weigh (G2) to the nearest 0.1 g. The time interval from the completion of stirring to the completion of weighing should not be greater than 5 minutes.

C. Put the weighed cloth funnel on the filter bottle and start the vacuum pump. Within thirty seconds, adjust the negative pressure to (53.33 ± 0.67) kpa. Strain for 20 minutes, then remove the funnel, wipe the remaining water in the lower mouth with filter paper, and weigh (G3) with an accuracy of 0.1 g.

If the difference between the measured water retention rate and its average value is not more than 3%, take the average value as the water retention rate of the test, otherwise the test should be repeated.

四、产品结构：

石膏砂浆保水率测定仪主要由旋片式真空泵、耐震真空表、抽滤瓶、布氏漏斗等部分组成，控制系统方便灵活，易于操作，整机布局合理，层次分明，适合各级质量检测部门及用户的使用。

Product structure:

Gypsum mortar water retention rate tester is mainly composed of rotary vane vacuum pump, shock-resistant vacuum gauge, suction filter bottle, Buchner funnel and other parts. The control system is convenient and flexible, easy to operate, the whole machine layout is reasonable, and the levels are clear, suitable for quality inspection departments at all levels. And user use.