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The measurement of viscosity is a vital aspect of quality control across a broad spectrum of industries-from petroleum refinement through to polymer production. While capillary viscometers have been a mainstay in laboratories for many years, manual testing methods are laborious, error-prone and do not lend themselves easily to automated processing. Digital kinematic viscometers represent a major step forward, combining highly precise temperature control with automatic sample handling and data management capabilities. Below are just some of the benefits to laboratories who transition to modern digital kinematic viscometry.
1. Elimination of Human Measurement Error
In the context of manual viscosity testing the operator records a measured time by watching the sample meniscus travel between two etched points on a glass capillary tube. Individual reaction times can vary considerably, from operator to operator and even test to test. For rapidly flowing solvents and opaque or colored samples this process can be incredibly frustrating and it makes consistent readings incredibly difficult to obtain.
Digital kinematic viscometers have in-built thermal or optical sensors which can record the exact position of the meniscus without any subjectivity. When combined with an automatic stopping and starting of timing, this allows for an end to all the inconsistencies associated with human error. It doesn't matter whether a sample is tested at 8:00 am or 8:00 pm, or by a seasoned technician or a new intern, the process is identical and leads to very low variations in measurement.
2. Increased Throughput with Automated Workflows
A single manual viscometer can only test one sample at a time and, between each test, it must be washed and re-filled. Laboratories performing viscosity testing for quality control could be processing tens or even hundreds of samples each day and the laborious steps of manual testing become unmanageable.
With a digital kinematic viscometer the measurement process is fully automated from start to finish. Multi-test units featuring a bank of capillary tubes within the same temperature-controlled bath enable simultaneous analysis of multiple samples. An integrated cleaning and drying cycle further reduces handling time. After a number of samples are loaded and the sequence has been initiated by the operator, further unattended testing can take place allowing analysis throughput to increase between 300-500% without the addition of further staff members.
3. Traceable Data and Regulatory Compliance
Quality management systems such as ISO 9001, IATF 16949 and various pharmacopoeias mandate traceable measurements, meaning that the user must be able to show where the results come from. Typically, a manual capillary test involves a paper logbook or a spreadsheet into which results are manually copied. This introduces potential errors and makes reconstructing previous testing information difficult. When a digital kinematic viscometer is used the whole test procedure is recorded along with the data: the exact test temperature, the identity of the sample, the flow time and the final calculated viscosity along with the date and time and the operator who performed the test. Full audit trails also log any changes made to methods and data. Data can be downloaded directly from the instrument into LIMS systems which takes away the need for data transcription. For anyone undergoing an audit, they have a complete unalterable record that is certain to stand up to scrutiny.
4. Simplified Operation and Reduced Training Time
It can take a considerable amount of training to learn the proper procedures to achieve good results in capillary viscometry testing. A technician needs to learn how to correctly load the sample without air bubbles or disturbances and how to hold and manipulate the glass tubes to achieve correct bath temperature. It is easy for an operator's reaction time to vary and for them to feel rushed when performing tests on a tight deadline, and this is compounded if they are inexperienced or tired.
By use of a user-friendly software interface the operation of a digital kinematic viscometer is extremely straight forward. A sample is simply loaded into the instrument's auto sampler, a method selected and a button is pressed. The instrument itself takes over control of temperature, flow time measurement, viscosity calculation and sample washing. New users can gain competence within hours, as opposed to weeks for manual systems, greatly reducing training costs and making staff flexible across various tests and instruments.
Summary
The use of digital kinematic viscometers can eliminate human measurement errors, dramatically increase sample throughput through automated workflows, ensure verifiable and traceable results for quality and regulatory compliance and ultimately, shorten the training requirement. These units are therefore a valuable investment for all modern laboratories that prioritize precision and efficiency in viscosity testing. Contact Hangzhou Zhongwang Technology Co., Ltd. today to find out how their range of automated viscometers and supporting equipment can bring digital precision to your testing needs.