Reference Manual
00809-0100-4731, Rev FA
April 2003
1-4
APEX
™
and APEX Sentry
™
Radar Gauge
Possible
SENTRY-
go to Step 3.
Possible
SENTRY-
go to step 3.
APEX
(1)
Possible
SENTRY-
go to step 3.
APEX APEX
APEX APEX APEX
Region C
Which Radar Gauge is Best for Your Level Measurement Application?
Dielectric
Constant, ε
r
Liquid Examples
1.5 - 4.0
(1)
(1) Consult Factory when dielectric less than 4
Hydrocarbons, petrochemicals,
freons, vegetable oils, toluene,
...
4.0 - 10.0 Organic or concentrated acids,
organic solvents, ...
> 10.0 Water-based fluids, alcohols,
dilute acids, acetone, glycols, ...
Dielectric
Constant
1.5 to 4.0
Dielectric
Constant
4.0 to 10.0
Dielectric
Constant
> 10.0
10 m (32.8 ft)
15 m (49.2 ft)
20 m (65.6 ft)
0 m
Maximum Distance
Region
C
7,5 m (24.6 ft)
30 m (98.4 ft)
Step 2. Liquid Surface Quality
Step 3. Tank Geometry
Is flange height
(A) 0,5 m (19.6 in)?
*
— AND —
Is the radar beam free
of any obstructions, such as fill
tubes, baffles, or
exposed agitators?
YES APEX Sentry
NO APEX only
Dielectric vs.
Distance Region
(from Step 1.)
Region A
Region B
CALM
No waves,
storage
MOVING
Mild rolling,
no splashing,
surface
unbroken
TURBULENT
Heavy
agitation,
vapors, filling,
splashing, or
reactions
Match surface
quality with
shaded region
from Step 1.
Region
A
5 m (16.4 ft)
Region
B
Region
B
Region
C
Region
A
Region
B
LEVEL-APEX_07A, APEX_08A, APEX_011A
Step 1. Dielectric vs. Distance
Choose the appropriate
shaded region for the application.
Region
A
Region
C
NOTE: To meet most telecommunications requirements, the APEX and APEX
Sentry Radar Gauges must be installed on enclosed or vented metal tanks.
However, other tank types may be approved in country of final destination. Refer to
product manual (document number 00809-0100-4731) for detailed information.
Surface Quality
* See “Antenna Selection
Guidelines” on page A-1
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