检测测量
概要：
1140型微分离器水分离特性、游离水和微粒试验（astm标准试验方法d3948、d7224、d7261和d4860）（规范d1655和d7566中包括d3948） 为了进行质量控制，对燃料的水分离特性进行评级，以确定存在
1140型微分离器水分离特性、游离水和微粒试验（astm标准试验方法d3948、d7224、d7261和d4860）（规范d1655和d7566中包括d3948）
为了进行质量控制，对燃料的水分离特性进行评级，以确定存在的表面活性材料（表面活性剂）的数量。表面活性剂会降低用于从燃料中除去水的过滤分离器的性能。水的存在会损害发动机性能并引发微生物生长，从而导致油箱腐蚀和燃油管路中的滤清器堵塞。此外，出于质量控制的目的，燃料也要进行“清亮”试验，以确定中间馏出物中游离水和颗粒物的含量。
仪器和试验说明
1140型微分离仪是一种用于进行四次离散试验的机电仪器。astm标准试验方法d3948（jet）、d7224（jet）和d7261（diesel）用于评定水分离特性，d4860（jet或diesel）用于检测和数值评定游离水和颗粒污染物。该仪器只需使用包含适当聚结器单元的四个“六包”中的一个就可以执行上述四个测试中的每一个。
水分离特性
试验方法d3948、d7224和d7261使用浊度计、机械混合器和一次性聚结过滤器。样品的一部分，在一个透明的玻璃小瓶中，用来设置仪表读数为100。小瓶中的样品被丢弃，小瓶被保留。
塑料注射器中的样品的另一部分用于使用混合器生成水/燃料乳液。乳化液以编程速率通过过滤器，一部分收集在保留的小瓶中。在浊度计中更换小瓶，并评定燃料的分水特性。
将获得的值与用于将仪表设置为100的未处理样品进行比较。额定值越高，100为值，表面活性剂含量越少。
游离水和微粒污染（清澈明亮）
试验方法d4860将一部分样品通过过滤介质，过滤介质收集在透明玻璃小瓶中。将小瓶放入浊度计中，并将仪表调整至100。处理过的燃料被丢弃，一部分未处理的燃料被放入小瓶，小瓶被重新插入浊度计。较高的额定值（值为100）表示自由水和微粒较少。
“六包”测试消耗品，包括聚结器电池
显示了一个通常称为“六包”的盒子，其中包含六个测试套件。每个测试套件都包含真空包装的消耗品，用于执行单个测试。每个聚结器/过滤器都贴有标签，以识别燃料类型和使用的适用astm方法。每六个包装中还包括一个蒸馏水容器，用于进行水分离试验。
model 1140 micro-separometerwater separation characteristic, free water and particulate testing (astm standard test methods d3948, d7224, d7261 & d4860)(d3948 is included in specifications d1655 and d7566)
for quality control purposes, water separation characteristics of fuels are rated to determine the amount of surface active materials (surfactants) present. surfactants degrade the performance of filter separators used to remove water from the fuel. the presence of water can impair engine performance and initiate microbiological growth, which can cause corrosion in tanks and filter plugging in fuel lines. also for quality control purposes, fuels are subjected to “clear & bright” tests to determine the amount of free water and particulate matter in mid-distillates.
deion of instrument & tests
the model 1140 micro-separometer is a electro-mechanical instrument used to perform four discrete tests. astm standard test methods d3948 (jet), d7224 (jet) and d7261 (diesel) are used to rate water separation characteristics and d4860 (jet or diesel) detects and numerically rates free water and particulate contamination. this instrument performs each of the four tests above simply by using one of the four “six packs” containing the proper coalescer cells.
water separation characteristic
test method d3948, d7224 and d7261 employs the use of a turbidimeter, a mechanical mixer, and a disposable coalescer filter. a portion of the sample, in a clear glass vial, is used to set the meter to read 100. the sample in the vial is discarded and the vial is retained.
another portion of the sample in a plastic syringe is used to create a water/fuel emulsion using the mixer. the emulsion is passed through the filter at a programmed rate and a portion is collected in the retained vial. the vial is replaced in the turbidimeter and the water separation characteristic of the fuel is rated.
the value obtained is compared to the unprocessed sample that was used to set the meter to 100. the higher the rating, 100 being the maximum, the less surfactant present.
free water and particulate contamination (clear& bright)
test method d 4860 passes a portion of the sample through a filter medium, which is collected in a clear glass, vial. the vial is placed in the turbidimeter and the meter is adjusted to 100. the processed fuel is discarded and a portion of the unprocessed fuel is placed in the vial, which is re-inserted in the turbidimeter. higher ratings, 100 is maximum, indicate that there is less free water and particulate present.
“six pack” test expendables including coalescer cells
a box commonly known as a “six pack” that contains six test kits is shown. each test kit contains vacuum packed expendables that are used to perform a single test. each coalescer/filter is labeled to identify the type of fuel and the applicable astm method to be used. a container of distilled water is also included in each six pack to perform water separation tests.
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