For more information, please select a topic from the list below.
How to choose the spindle and speed?
Why do I need a viscosity standard?
How many viscosity standards do I need?
Should I use silicone oil or mineral oil?
My liquid has a viscosity value that does not belong to the list of standard liquids, what should I do?
How do I know if my instrument is calibrated?
What is a good calibration check I can perform?
Should I use an analog or digital model?
How is viscosity affected by temperature?
What is the accuracy of my Brookfield temperature probe?
How long should I wait to reach thermal equilibrium?
How is the accuracy of the reading calculated when testing a sample?
How to calculate the accuracy of CAP 1000/2000?
My dial reading and/or cP (viscosity) value will not stabilize, what does this mean?
My spindle wobbles when spinning - what does it mean?
What is a mathematical model and when should it be used to evaluate viscosity test data?
My digital viscometer shows "EEEEE" when I try to test a material? what does that mean?
What format is better for storing data?
Will PG Flash work with my computer?
How do I choose a spindle?
Select the main axis:
The process of selecting a spindle and speed for use with a Brookfield viscometer is ultimately trial and error. However, there are a few ways to narrow down the possibilities before doing any testing. If a sample was historically tested with a particular speed and spindle combination, the user should use that same combination. This helps ensure that test results are accurate and repeatable. The goal is to choose a spindle with a dial or digital display that produces 10% to 100% torque.
When the viscosity of the fluid is known:
The maximum viscosity range for a spindle running at a given speed is equal to the spindle factor multiplied by 100. This is the full scale range for that spindle/speed combination. The minimum measurable viscosity is equal to 10 times the coefficient, or one tenth of the full scale range. Knowing the full scale range allows you to determine if your fluid is capable of that spindle/speed combination.
In addition, digital viscometers equipped with the AUTO RANGE key can automatically obtain the full scale range. Enter the spindle code and RPM setting, then press the AUTO RANGE key. The viscometer will calculate and display the full scale viscosity for that spindle and speed combination.
When the viscosity of the fluid is unknown.
If the reading is below 10% or above 100%, the user should select a different speed to obtain a reading within the recommended range. If changing the speed does not provide a reading between 10% and 100%, the user should try another spindle. In general, if the reading is above 100% at the lowest speed, the next smallest spindle should be used. If the reading is below 10% at top speed, the next largest spindle should be used.
To test fluids at multiple speeds, choose a spindle that will produce a 10% to 100% reading for at least three speed settings.
Why do I need a viscosity standard?
Viscosity standards are used to check the accuracy of your Brookfield Viscometer. Brookfield silicone and mineral oil standards give you a fluid viscosity value constant at 25°C, making calibration verification easy to establish. Standards are a traceable part of calibration verification - an important part of many accredited quality systems such as ISO, ASHTO, etc.
How many viscosity standards do I need?
Usually one or two is enough. Choose a fluid with a viscosity value suitable for the measuring range of the spindle and the speed normally used.
Should I be using a silicone or mineral oil viscosity standard?
This choice depends on your product. Silicone is commonly used because it is less sensitive to temperature. Some manufacturers, such as the paint industry, cannot use silicones in their processes, so mineral oils are the preferred choice.
Brookfield made specific recommendations:
Silica gel
All viscometers use conventional spindles, small sample adapters and UL adapters
High temperature silicone (HT)
All viscometers use Thermosel accessories and controllers
mineral oil
KU Liquid for KU Viscometer
CAP Liquid for CAP1000 and CAP2000 Viscometers
special purpose mineral oil
Encourage Wells/Brookfield Cone/Plate Viscometer
My fluid has a viscosity that is not part of your standard fluid listing, what should I do?
When checking the accuracy of a Brookfield viscometer, the viscosity of the sample fluid is usually of less importance because:
- Your fluid may be non-Newtonian, so viscosity will change; Brookfield Viscosity Standard fluids do not change with time or shear (rpm), making calibration checks more definitive
- Your Brookfield viscometer will not be more or less accurate on one range (rpm and spindle) than the next; if the viscometer passes in one range, it can be considered calibrated over the entire range
......With this in mind, you probably don't need a special order mix
How do I know if my instrument is calibrated?
您的Brookfield粘度计/流变仪保证准确到使用中满量程范围的+/- 1.0％。您可以通过执行校准检查来检查粘度计的准确度。
使用标准锭子对粘度计/流变仪进行校准检查：
您需要使用：
600毫升烧杯; 允许任何气泡达到表面
控制温度25.0°C（+/- .01°C）; 留出足够的时间进行温度平衡; 这包括
适用
于过去12个月内最初打开的LV和RV主轴液的标准，主轴和护腿护腿。
校准检查的准确性为：
仪器精度为全量程使用范围（FSR）的1％和添加到标准流体精度中，cP为1％流体值。
计算仪器的精度：
FSR是主轴和使用速度乘以100的因素; 通过选择主轴，速度然后按下AUTO RANGE按钮，也可以在数字模型上找到FSR; 然后屏幕将显示cP值@ 100％（FSR）; 显示FSR的1％是仪器精度。
确定标准流体的准确度：
流体值位于罐子的标签上，高于“值”一词，并以cP（mPa·s）表示。计算此值的1％。
什么是很好的校准检查，我可以执行？
使用布鲁克菲尔德粘度标准流体以3种不同的旋转速度测试Brookfield粘度计/流变仪，以验证仪器在感应低，中和高％扭矩时如何响应。
例：
RV＃3心轴RV粘度计，20,10和5 rpm
Brookfield粘度标准液：标称值= 5000 cP; 实际值= 4850 cP
我应该使用数字VISCOMETER还是使用拨号阅读（模拟）VISCOMETER？
无论仪器是表盘还是数字仪器，从Brookfield仪器获得的粘度结果都是可重复的。假设所有其他条件相同 - 主轴，速度，温度，容器尺寸，弹簧扭矩等，在表盘读数粘度计上产生的读数与在数字粘度计上产生的读数一样有效，准确和可重复。
如何受温度影响的粘度？
一般而言，粘度与温度成反比关系。随着温度升高，粘度降低。因此，在任何粘度测量过程中控制样品的温度重要性无庸赘述。
什么是我的布鲁克菲尔德温度探测器的准确度？
Brookfield温度精度为+/- 1°C至150°C，+ / - 2°C高于150°C至300°C。此精度适用于DV-I + w /温度探头，DV-II +，可编程DV-II +，DV-II + PRO，DV-III，DV-III +，带有74,75,85和106型控制器的Thermosel，CP的RTD / CPE-44PY杯，SC4 - ** RPY钱伯斯。
我应该多久等待热平衡？
热平衡是粘度测量的每个元素处于统一温度的状态。这些元件包括但不限于心轴，护腿，样品容器，样品和温度探针。因为温度对于准确的读数重要性无庸赘述，所以应该留出足够的时间来达到平衡。一般来说，一小时是等待的最短时间。被测材料越粘稠，您应该等待的时间越长。
有机硅在600 mL烧杯中的建议
5 - 500 cP = 1小时
1000 - 12,500 cP = 2小时
30,000 - 100,000 cP = 4小时
有关配件，锥/板，CAP，SSA和UL适配器中有机硅和矿物油的建议
10 - 20分钟取决于音量
针对KU粘度计的矿物油的建议
1 - 2小时
如何在测试样品时计算读数的准确度？
精度计算为粘度计满量程范围（FSR）的1％。FSR定义为具有给定主轴和速度的可达到的最高粘度读数。确定FSR的简单方法是按数字式粘度计上的AUTO RANGE按钮。按此键显示主轴的FSR和输入的速度。取这个值的1％可以获得仪器的准确性。对于拨号粘度计用户，将您的系数乘以100可获得FSR。因此，您可以看到您的因子等于您的仪器精度。
我如何计算CAP 1000/2000准确度？
Brookfield CAP粘度计的准确性基于两个独立的因素。第一个因素是仪器的准确度，第二个因素是校准液的准确度。总精度是仪器精度加上流体精度。
仪器精度通过参考CAP粘度计手册中的表3.1确定。操作员需要确定仪器是高温还是低温CAP，以及它是1000还是2000型号。使用锥形主轴编号交叉引用该信息时，它们将确定图表上的数字。该数字是需要被视为仪器精度的满量程范围的百分比。
例如：CAP 1000H，锥形主轴3在900 rpm。
操作员需要首先确定这些条件的CAP的满量程范围。按下RPM按钮，显示屏将显示100％= X，X为满量程范围的Poise值。在这些条件下，FSR为8.333 Poise。从表3.1中，According to校准流体是否大于或小于FSR的50％，计算出的精确度FSR百分比为2或4％。
如果我们的校准液为4泊，我们将精度计算为FSR的2％，或8.333的2％。仪器精度因此为.1666，四舍五入为.17 Poise。流体精度为4泊的1％或.04泊。因此总精度为.04 + .17，或.21 Poise。
我的拨号阅读和/或CP（粘度）值不会稳定 - 这意味着什么？
大多数流体表现出“非牛顿”行为，阻止它们显示恒定的厘泊值或拨号读数。有关牛顿流体和非牛顿流体的更多信息，请参阅我们的免费出版物“解决粘滞问题的更多解决方案”。
当我的主轴旋转时我的主轴摇摆 - 这意味着什么？
主轴可以弯曲; 检查我们出版的“更多解决粘性问题解决方案”附录A中的尺寸的平直度。宝石轴承，枢轴点和轴可以磨损或弯曲; 执行校准检查以确定粘度计是否仍在校准范围内。粘度计需要维修和重新校准。
什么是数学模型，何时使用它来评估粘度测试数据？
各种数学模型由不同的研究人员According to经验开发，以适应他们在自己的数据集中看到的趋势。数学模型是一个“很好的拟合”线，可用于表征特定测试的数据，并且具有易于数据存储的优势，并通过查看斜率和y截距与类似测试进行比较。
有一些简单的模型可以为许多数据集提供合理的拟合，并且具有对各种从业者有一定意义的参数 - 无论这些人是研究人员，QA / QC人员还是流程工程师。例如，改进的Casson模型非常适用于测试巧克力等。Herschel-Bulkley模型适用于具有屈服点然后在屈服后“剪切薄”的材料。这可能适用于“凝胶状”材料，
The "Analysis" module of Brookfield in our application software (Rheocalc and Wingather) lists the results of the curve fitting parameters as well as the "Fit Coefficients". Try some of our models, for example choose a model with a good "CoF" - the closer to "1.00", the better the fit. Accurately predicting product behavior can be difficult. For example, a conservatively used rheological model may be suitable for interpolating apparent viscosity at various shear rates. Nevertheless, some models can be used to infer the yield stress, for example, at a shear rate value of zero. The more data points taken, the more reliable the fit.
Also keep in mind that a model may only be used because it is "simple" and "reasonable enough to estimate". That doesn't mean it will be a good model. An example is in the petroleum industry: "drilling mud" rheology has been examined for many years with the Bingham model, even though these materials are highly non-Newtonian! The Bingham model assumes Newtonian behavior after yielding. Still, the field staff felt, "good enough" for them to understand how the material was being handled. Over the past few years, more practitioners have started using the "HB" model.
My digital vision system says "EEEEE" when I try to test a material? what does that mean?
Displaying "EEEEE" on the digital viscometer means the reading is out of range. That is, the material reading is above the full scale range for your chosen spindle and speed. Reduce speed or change spindle to increase full scale range.
What format is better for storing data?
We recommend saving data in native form and in ".CSV" files. ".CSV" files can be read by ASCII/plain text (e.g., MS-Notepad(tm)) readers and MS-Excel(tm) spreadsheets. .
Can CAN PG FLASH be used with my computer?
PG Flash is only used to download programs to the viscometer. When used with DV2T or DV3T, Rheocalc-T should be used to get data to PC.
