Saab TankRadar L/2
19
US Version. Seventh edition, June 1995
Installation Manual
3.5
Description of the LPG/LNG Gauge, RTG 2960
The RTG 2960 is designed for level measurement in LPG and LNG
tanks. A still pipe is required for the measurement. It 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 window 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 three different versions, a 150
PSI version, a 300 PSI version and a 600 PSI version.
The patented reference pin function enables verification of mea-
surement without opening the tank. There is a Reference Pin at the
top of the still pipe and a Reference Plug made of epoxy resin at
the bottom. If epoxy can not be used in the tank, two or three
reference pins can be used without the Reference Plug. By setting
the gauge into "test mode" it measures against these references
and compares with the actual distances to these references that
were stored during installation.
See also chapter 10.4 for installation requirements for the LPG/
LNG Gauge.
3.5.1
Installation Data for RTG 2960
Operating temperature in tank
Stainless steel flange -66
°
C to +
90
°
C (67
°
F to 194
°
F)
Measuring range
0 to 40 m from cone end
(0 to 131 ft.)
Pressure
Up to 25 bar (375 PSI)
Still pipe dimension
4" Sch. 10 or 100 mm inner
diameter.
Total weight
150 PSI – appr. 38 kg (84lbs)
300 PSI – appr. 48 kg (106 lbs)
600 PSI – appr. 68 kg (150 lbs)
W11
W12
FOR
INTRINSICALLY
SAFE CIRCUITS
ONLY
"i"
6" Existing
pressure
vessel
flange
1.0 m
0.35 m
Lower Flange
Weather
Protection
Hood
Transmitter
Head
Valve
Pressure
Transducer
Pipe Cone
4" or ø100 mm
Still Pipe
Housing
Figure 3.9 shows
the LPG/LNG
Gauge.
