Reference Manual
00809-0100-4731, Rev FA
April 2003
APEX
™
and APEX Sentry
™
Radar Gauge
2-6
Foam and Vapors
Foam may affect the gauge performance because it can reduce the radar
signal being reflected. The effect is highly dependent on the particular
characteristics of the foam. In general, the APEX Radar Gauge reads the top
of the foam if it is sufficiently reflective. The APEX Sentry Radar Gauge is not
for use in applications with foam.
Changing Density, Temperature, or Pressure
The level accuracy is not affected by changes in the density, temperature, or
pressure of the product.
Turbulence or Vortices
The gauge uses advanced signal processing, reducing the effects of
turbulence and vortices. However, the greater the turbulence or vortex the
larger the effect because they disturb the product surface where the signal is
being reflected. With vortices caused by agitators, you need to be aware of
the “swell” effect. That is, the product surface will rise in the vessel when
sufficiently agitated and the radar output will measure this rise. The APEX
Sentry Radar Gauge is not for use in turbulent applications. Refer to Figure
2-18 on page 2-22 for further information.
Table 2-1. Sample list of dielectric constants
Dielectric Constant Ranges for Chemicals Listed
Less Than 1.8 1.8 to 4.0 4.0 to 10.0 10.0 to 15.0 15.0 to 20.0 More than 20.0
carbon dioxide acetylene acetic acid benzyl alcohol ammonia acetone
cyclopentane asphalt bromobutane butyl nitrate butanol ethanol
ethylene benzene butyl alcohol carveol cyclohexanol ethylene glycol
methane butane chlorobenzene creosol diacetone alcohol glycerine
jp4 (military fuel) carbon tetrachloride chloroform dimethyl oxalate dichloro ethane glycol
propane cocaine chlorotoluene ethylene chloride isopropyl alcohol hydrazine
freons cresol hexanol lactic acid hydrogen peroxide
kerosene dibutyl phtalate iodine methylamine hydrogen cyanide
napthalene dichlorobutane methylamine methyl ethyl ketone latex
octane ethylamine phenol nitroglycerin methanol
oleic acid nicotine pyridine sulfur dioxide molasses
petroleum oils phosphorus tripropyl phosphate propanol
stearic acid phosgene vinyl isocyanate sorbitol
styrene sulfur water
sulfur toluene diisocyanate
toluene
vegetable oils
To Next Page
Loading...
Need help?
General
