一、產品簡介：
石膏保水率測定儀是**檢測儀器，依據中華人民共和國國家建材行業(yè)標準《粉刷石膏》（JC/T517-2004）而研制的用來檢測粉刷石膏的保水率的測定，同時也可用于水泥、砂漿保水率試驗。
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、技術參數：
?布氏漏斗，內徑150mm，深65mml，孔徑2mm，孔數169個。
?耐震真空表0至0.1MPa
?真空泵負壓可達0.1MPa
?T型刮板，由厚為1mm的硬質耐磨材料制成。
?抽濾瓶5000ml。
?電源電壓:220V 50Hz.
?外形尺寸:700×400×600mm
?功率：200W
?凈重：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、實驗步驟：
A、按布式漏斗內徑裁剪中速定性濾紙一張，將其鋪在漏斗底部，濾紙和濾紙用水浸濕。將布式漏斗放在抽濾瓶上，開啟真空泵，抽濾一分鐘，取下布式漏斗，用濾紙將下口殘余供應商上海榮計達實驗儀器有限公司的水擦凈后稱量(G1),精確至0.1克。
B、采用具有標準擴散度用水量的石膏漿放入稱量后的布式漏斗內，用T型刮板在漏斗中垂直旋轉刮平，使料漿厚度保持在（10±0.5）mm范圍內，擦凈布式漏斗內壁上的殘余石膏漿，稱量(G2)，精確至0.1克。從攪拌完畢到稱量完成的時間間隔不應大于5分鐘。
C、將稱量后的布式漏斗放到抽濾瓶上，開動真空泵。在三十秒之內將負壓調至（53.33±0.67）kpa.抽濾20分鐘，然后取下漏斗，用濾紙將下口殘余水擦凈，稱量(G3)，精度0.1克。
若連續(xù)兩次測得的保水率與其平均值的差不大于3%，取該平均值作為試驗的保水率，否則應該重做試驗。
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、產品結構：
石膏砂漿保水率測定儀主要由旋片式真空泵、耐震真空表、抽濾瓶、布氏漏斗等部分組成，控制系統(tǒng)方便靈活，易于操作，整機布局合理，層次分明，適合各級質量檢測部門及用戶的使用。
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.
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