Endress+Hauser Float level gauge LT5 Operating Instructions Manual page 73

Float level gauge LT5
Endress+Hauser
1
Ø140 (5.51)
140
130
120
1.
110
100
90
1.
80
70
60
50
40
0.5
 60 Indicator value when the tank is filled with water. Measurement unit: mm (in)
1 Draft surface at density ρ
2
Water (draft surface when the density is 1.0 g (0.002 lb)/cm
Equation: For the φ400 mm (15.75 in) float of LT5-4/LT5-6 8 300 g (18.30 lb)
Float draft when the tank is empty
1.
W - T V
-
ρ 2
h
Lf = +
= 80.11mm
2 S
Float diameter D
Float mass W
Waterline cross S
section
Density of the ρ
measured liquid
Correction of indicated value with simulated actual liquid
2.
Lb = Lf (water) - Lf (actual liquid)
Float diameter D
Float mass W
2
2.
1.0
400 mm (15.75 in)
8 300 g (18.30 lb)
1 256.64 cm 2
1 g (0.002 lb)/cm 3 (assuming "empty = water")
= 56.50 mm
400 mm (15.75 in)
8 300 g (18.30 lb)
Commissioning
1
Ø140 (5.51)
2.
1.5
3 )
Float height h 200 mm (7.87 in)
Float volume V 19 200 cm
Tape tension T 1 200 g (2.65 lb)
Float height h 200 mm (7.87 in)
Float volume V 19 200 cm
60
50
40
30
20
10
0
-10
-20
-30
-40
2.0
A0041241
3
3
73