Siemens SITRANS LG250 Operating Instructions Manual page 68

Second Line of Defense (optional)
Ʋ The Second Line of Defense (SLOD)
is a second level of the process
separation in the form of a gas-tight
feedthrough in the lower part of the
housing, preventing product from
penetrating into the housing.
Ʋ Supporting material
Ʋ Glass potting
Ʋ Contacts
Ʋ Helium leak rate
Ʋ Pressure resistance
Ohmic contact
Process fittings - tube: ø 21.3 mm (0.839 in)
Ʋ Pipe thread, cylindrical (ISO 228 T1)
Ʋ American pipe thread, conical
(ASME B1.20.1)
Ʋ Flanges
Process fittings - tube: ø 42.2 mm (1.661 in)
Ʋ Pipe thread, cylindrical (ISO 228 T1)
Ʋ American pipe thread, conical
(ASME B1.20.1)
Ʋ Flanges
Weight
Ʋ Instrument weight (depending on
process fitting)
Ʋ Tube: ø 21.3 mm (0.839 in)
Ʋ Tube: ø 42.2 mm (1.661 in)
Probe length L (from seal surface)
Ʋ Tube: ø 21.3 mm (0.839 in)
Ʋ Tube: ø 42.2 mm (1.661 in)
Ʋ Trimming accuracy - tube
Lateral load
Ʋ Tube: ø 21.3 mm (0.839 in)
Ʋ Tube: ø 42.2 mm (1.661 in)
Torque for NPT cable glands and Conduit tubes
Ʋ Plastic housing
Ʋ Aluminium/Stainless steel housing
Input variable
Measured variable
Min. dielectric constant of the medium
68
316L
Borosilicate glass GPC 540
Alloy C22
< 10 mbar l/s
-6
See process pressure of the sensor
Between ground terminal, process fitting and probe
G¾, G1, G1½ according to DIN 3852-A
¾ NPT, 1 NPT, 1½ NPT
e.g. DIN from DN 25, ASME from 1"
G1½ according to DIN 3852-A
1½ NPT
DIN from DN 50, ASME from 2"
approx. 0.8 ... 8 kg (0.176 ... 17.64 lbs)
approx. 1110 g/m (11.9 oz/ft)
approx. 3100 g/m (33.3 oz/ft)
up to 6 m (19.69 ft)
up to 6 m (19.69 ft)
±1 mm
60 Nm (44 lbf ft)
300 Nm (221 lbf ft)
max. 10 Nm (7.376 lbf ft)
max. 50 Nm (36.88 lbf ft)
Level of liquids
ε ≥ 1.4
r
SITRANS LG250 - Operating Instructions PBD-51041387