04/03
347
LB
444
52
7.6
Calculation of Square Temperature Coefficient
If significant temperature variations are likely to occur in the product (approx. > ± 20°C),
it is advisable to enter the square temperature coefficient as well.
Calculation:
a) Calculate
TC
1
(see above)
b) With
TC
1
calculate nominal value
ρ
2
'
at higher temperature
ρ
2
' =
ρ
1
+ (
ϑ
1
-
ϑ
2
) *·TC
1
c) Take actual density value
ρ
2
from table
d) Calculate
TC
2
:
(
)
-
-
'
=
TC
2
2
1
2
2
2
ϑ
ϑ
ρ
ρ
e) Enter calculated value TC
2
as
temperature coefficient TC2
.
Example:
Ethanol, concentration 30 %, reading in g/cm
3
, relative to 10°C.
1
st
temperature coefficient in range 10 - 20° C:
3
1
10
*
59
.
0
20
10
9540
.
0
9599
.
0
−
=
−
−
−
=
TC
Input value TC1: 5.9e-04
Calculate nominal value
ρ
2
' of density calculated using the calculated TC
1
at 100° C:
ρ
2 = 0.9599 + (10 - 100) * 0.59 *10-3 = 0.9068
ρ
2 (table value) = 0.8936
6
2
2
10
*
2962
.
1
)
100
10
(
8963
.
0
9068
.
0
−
=
−
−
=
TC
Input value TC2: 1.2962e-06
Summary of Contents for LB 444
Page 1: ...Density Meter LB 444 Id No 32816BA2 Rev No 04 22 04 03 ...
Page 2: ......
Page 9: ...04 03 347 LB 444 VII ...
Page 10: ......
Page 109: ...04 03 347 LB 444 99 13 4 Mounting Device 90 for Pipe Diameter 21 3 76 1 mm ...
Page 112: ...04 03 347 LB 444 102 ...
Page 113: ...04 03 347 LB 444 103 ...
Page 114: ...04 03 347 LB 444 104 ...
Page 117: ...04 03 347 LB 444 1 14 Ex Certificates for Evaluation Unit ...
Page 118: ...04 03 347 LB 444 2 ...
Page 119: ...04 03 347 LB 444 3 ...
Page 120: ...04 03 347 LB 444 4 15 Ex Certificate for the Detectors ...
Page 121: ...04 03 347 LB 444 5 ...
Page 122: ...04 03 347 LB 444 6 ...
Page 123: ...04 03 347 LB 444 7 ...
Page 124: ...04 03 347 LB 444 8 ...