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Rosemount Tank Radar REX
Chapter 14 Technical Data
14-6
Installation Manual
308014EN, Edition 4
May 2013
14.4 RTG 3950
Hazardous locations certifications
II 1/2G Ex d IIB Ga/Gb T6 
(T
amb
= -40 °C to +70 °C) according 
to ATEX directive (EN 50014, 
EN 50018, EN 50020, EN 50284 
Europe).
Class 1, Div I, Groups C and D 
according to UL 1203, UL 913, UL 
508 (USA).
Ex d IIB Ga/Gb T6 (T
amb
= -40 °C to 
+70 °C) according to IECEx.
Antenna type
High precision still-pipe array 
antenna.
Operating temperature in tank
-40°C to +120°C (-40°F to +248°F)
Measuring Range
0 to 40 m (0 to 130 ft) from antenna 
end.
Pressure
RTG 3950, fixed version
2 bar at 20 °C.
RTG 3950, inclined version
5” to 8” antennas:
-0.2 to +0.5 bar (-2.9 to 7.3 psig).
10” and 12” antennas:
-0.2 to +0.25 bar (-2.9 to 3.6 psig).
Material exposed to 
Antenna: Acid proof steel type 
tank atmosphere
EN 1.4404 (AISI 316L) and 
Polyphenylensulfide (PPS).
Sealing: PTFE.
O-ring: Fluoro-Silicon.
Flange: Acid Proof Steel EN 
1.4404 (AISI 316L).
Still-pipe dimensions
5” SCH 10-60
6” SCH 10-60
8” SCH 20-80
10” SCH 10-60
12” SCH 10-40-XS
Total weight
Appr. 20 kg (44 lbs), flange 
excluded