Emerson Rosemount 3308 Series Reference Manual page 13

Reference Manual
00809-0100-4308
2.1.4 Probe end peak
It is caused by reflection from the probe end. If the probe is grounded, the peak will be
positive. If the probe end is submerged in a high dielectric media, such as water, it will not
be visible.
2.1.5 Upper Reference Point
The Upper Reference Point is located at the underside of the threaded adapter,
transmitter flange, or Tri-Clamp
Figure 2-3: Upper Reference Point
A. NPT
B. BSPP (G)
C. Flange
D. Tri-Clamp
E. Upper Reference Point
F. Total Probe Length
2.1.6 Zero reference point
The Zero Reference Point is selected by the user and is usually located close to or at the
bottom of the tank. The Zero Reference Point can be set to any position in the tank by
adjusting the Tank Height.
2.1.7 Tank height
The Tank Height is the distance from the Upper Reference Point to the Zero Reference
Point. The transmitter measures the distance to the product surface and subtracts this
value from the Tank Height to determine the level.
Reference Manual
®
, as illustrated in Figure
Transmitter overview
February 2020
2-3.
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