Emerson Edition 4 ユーザーズマニュアル

Rosemount Tank Radar REX
Chapter 3 Description of 3900 REX

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.