Typical Applications; Typical Industries; Principle Of Operation - Emerson Micro Motion 7829 Viscomaster Dynamic Product Data Sheet

Typical applications

• Heavy fuel oil (HFO) heater control to burners
and engines
• Lube oil viscosity control

Typical industries

• Marine
• Power
• Heavy fuel oil (HFO) blending and bunkering

Principle of operation

The 7829 Viscomaster Dynamic viscosity meter
uses vibrating fork technology to measure viscosity.
Viscosity is measured by detecting the bandwidth
around the fork's natural vibration frequency.
The following figure illustrates how the 7829 meter
uses the frequencies at point A (the lower
–3 db point) and at point B (the upper –3 db point)
to digitally calculate bandwidth and quality factor.
Quality factor is then used to define fluid viscosity
using standard calibration techniques.
Response
amplitude Product 1
Product 2
Bandwidth = Point B – Point A
Resonant Frequency = (Point A + Point B) / 2
Quality Factor = Resonant Frequency / Bandwidth
Micro Motion 7829 Viscomaster Dynamic Viscosity Meter
Product 1 – Low Viscosity
Product 2 – High Viscosity
Frequency (Hz)
3