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Rosemount Tank Radar REX
Chapter 3 Description of 3900 REX
3-6
Installation Manual
308014EN, Edition 4
May 2013
The Still Pipe Gauge, RTG 3950
The Still Pipe Gauge is used on tanks
with still pipes and with all products
suited for still pipes.
The gauge uses a low-loss radar
propagation mode which virtually
eliminates the influence of the still
pipe condition. Measurement is
made with highest accuracy even
when the pipe is old, rusty and cov-
ered with deposits.
The Still Pipe Gauge fits 5”, 6", 8",
10" and 12" pipes. It can be mounted
on an existing still pipe and there is
no need to take the tank out of opera-
tion during installation.
There are two versions of RTG 3950:
fixed and inclined. The inclined ver-
sion has a hinged hatch, enabling full
pipe size product sampling or verifi-
cation hand-dips.
The LPG/LNG Gauge, RTG 3960
The RTG 3960 is designed for level
measurements in LPG and LNG
tanks. A 4” still pipe is used as a
wave guide for the measurement and
prevents a wavy or boiling surface
from disturbing the measurement.
Radar signals are transmitted inside
the pipe towards the surface.
The pressure sealing is a quarts win-
dow approved for use in pressure
vessels. As standard the gauge is
also equipped with a fire-proof block
valve and a vapor space pressure
sensor.
The LPG/LNG Gauge is available in
two versions, a 150 PSI version and
a 300 PSI version.
The reference pin function enables
verification of measurement without
opening the tank. By setting the
gauge into “test mode” the measured
distances are compared with the
actual distances.
Figure 3-7. The RTG 3950 Still Pipe Gauge
Waveguide
Unit
Weather
Protection
Hood
0.7 m
Antenna
0.5 m
0.59 m
Figure 3-8. The RTG 3960 LPG/LNG
Antenna Gauge
Weather
Protection
Hood
Transmitter
Head
Pressure
Transducer
Housing
1.0 m
Valve
Pipe Cone
Lower Flange
6" Existing
pressure vessel
flange
4" or Ø 100 mm
Still Pipe
0.3 m