Viscometry VISCOSYSTEM® | AVS® | VISCOCLOCK | VISCOMETERS SI Analyticsa xylem brand

Innovative capillary viscometry - from the outset The viscosity of Newtonian fluids can be most precisely determined using capillary viscometers. This method of measurement, measures the time taken for a defined quantity of fluid to flow through a capillary with a known diameter and known length. With the industrial production of such precisely calibrated capillary viscometers, we have created the conditions to enable this measuring method to establish itself worldwide as a reliable procedure. With the development of the first automatic measuring systems, we replaced the stopwatch with automatic...

1 Measurement Devices 1.1 Applications AVS® systems AVS® measurement systems within quality assurance systems Polymer applications for the AVS® measurement systems Recommended capillary sizes and AVS® measurement systems For polymer analytics, mostly Ubbelohde viscometers are applied (type with suspended level). In general, viscometers according to DIN 53 000 as well as ASTM D446 can be used, as there is only a slight difference between both designs. Especially ISO standards for polymer analytic generally allow both designs. However, in case of ASTM standards, e.g. ASTM D4603, the ASTM viscometer...

1.2 ViscoCIock plus Automatic measurement of flow times The ViscoCIock plus is an electronic timing unit for glass capillary viscometers used to determine kinematic and relative viscosity. Succeeding the well-proven ViscoCIock, the new instrument features data storage and simpler handling. The ViscoClock plus is especially designed for Ubbelohde type viscometers which are well-known for highest precision. The ViscoCIock plus is designed for SI Analytics® Ubbelohde, Micro Ubbelohde and Micro Ostwald viscometers. The flow time is measured automatically by two infrared light barriers which detect...

Technical Data - ViscoCIock plus ViscoCIock plus - The plus for your measurements Housing Materials Dimensions Weight Sample and viscometer identification To allocate the stored measuring results, the user can enter 2-digit numbers to the ViscoCIock plus before measurement. These IDs - together with date and time - ensure an unambiguous assignment of the flow times. Absolute viscosity To determine absolute kinematic viscosities, calibrated viscometers have to be used. To guarantee best accuracy, viscometers which were calibrated by automatic measurement should be used. The constant of automatic...

The core of all AVS® systems The ViscoPump exists currently in the 3rd generation. It is included in all AVS® devices and has several central functions: • The signals of automatic meniscus detection - from measuring stands in the case of optical detection or TC viscometers - are evaluated to determine the flow time. • With a built-in pump, the liquid is pneumatically pumped up into the measuring bulb of the viscometer. • The available working modes are either the classic pressure or the suction mode. The operation (by suction of the liquid in the capillary tube) has advantages in some applications,...

1.4 AVS® 470 Precise Capillary Viscometry - Easy, Flexible and Independent of a PC ^ Perfectly equipped for automatic viscosity measurements The AVS® 470 is a measuring system that includes everything you need to take precise and reproducible measurements. All types of viscosity calculations with polymer solutions are integrated into the device. A small keyboard allows you to enter additional data. A serial printer can be used to conveniently document your results. So, in a minimum of space, you can set up a measuring station equal in every way to complex measuring installations in terms of precision...

Technical data Working with the AVS® 470 is easy The desired measurement method can be preselected and started on the device. The entire measurement is automatic to eliminate subjective measurement errors. Once the set pre-heating time is reached, the desired number of measurements are taken.The status of the measurements is continuously displayed. If required, individual parameters may be input via an included keyboard. A serial printer can be used to print measurement logs. The connections are on the front panel of the device for easy control. Over-pumping and oversuction are prevented by the...

AVS® 370 makes maximum precision easier and more flexible, with provision for future expansion! Well equipped for all viscosity determination The AVS® 370 is a PC-controlled measuring device, which not only measures as precisely and consistently as you expect, but also offers maximum flexibility and future extensions. Furthermore, it saves laboratory space. Suction and pressure mode - with one device The AVS® 370 is operating with the ViscoPump III as the control unit for measurement and rinsing and therefore is able to pump the sample liquid in two different ways: by "suction" as well as by...

As a further advantage, the suction mode exhibits increased reproducibility of flow times in case of Ubbelohde viscometers and samples which tend towards foaming: The bubbles are created during pumping of the liquid to the measuring bulb, when air is mixed with the small amount of liquid remaining in the lowest part of the capillary. In suction mode, the liquid can be blown out by a special function of software WinVisco 4. Two detection methods to measure flow times To measure the flow time, the liquid meniscus can be detected by optoelectronics or thermally, by TC sensors. In both cases, the...

Technical data Working with AVS® 370 is easy The entire measurement procedure is place automatic, subjective measuring errors are reliably eliminated. The PC starts the measurement. After the set preconditioning period the selected number of Durchflusszeiten gemessen and the measured values saved. The system protects against accidental overpumping or oversuction by means of a capacitive sen sor. This prevents the sample to be measured from getting into the vessel containing the liquid or inside the device. Unique flexibility In the PC-controlled multiple measurement station, the AVS® 370 offers...