The HTHS determines the viscosity of engine oils under
conditions of high shear at a temperature of 150°C. Pressurized gas is used to
force an oil sample through a capillary maintained at 150°C ±0.1°C to obtain the
required shear rate (normally 106 sec–1). Other temperatures and shear rates can
also be used. The five viscometric cells in the instrument may be operated in
rapid succession. A digital stop-clock measures flow (efflux) time within 0.01
seconds. Flow times, temperature and pressure are all displayed digitally. A
sample flush cycle eliminates the need for solvent cleaning during normal HTHS
operation. Other features include built-in, replaceable filters and a pressure
relief valve which protects against over-pressurization. The pressurized gas(not
supplied) may be carbon dioxide, nitrogen, or an inert gas.
Features:
The new CANNON® High-Temperature High-Shear (HTHS) Capillary
Viscometer is designed to determine the viscosity of engine oils and other oils
under conditions of high shear at high temperatures. The HTHS is capable of
testing at 1.4x106 s-1 at 150°C, and meets all precision
specifications of ASTM D 5481.Oil samples are introduced into the viscometric cells and then flow through
small glass capillaries under pressure to achieve the desired shear rate. The
HTHS monitors each test and displays the results. You can also analyze, display,
and print test data with the computer software.Components:
The HTHS viscometer is supplied with a digital temperature control system
(variable from 30°C to 150°C), a digital pressure measuring system, automatic
timer, and the High Shear Viscosity Calculator (Standalone software package for
Windows® for HTHS data analysis and output). |
