Technical data
Proline Promass E TB2 HART
104
Hauser
• The minimum recommended full scale value is approx. 1/20 of the maximum full scale value
• In most applications, 20 to 50% of the maximum full scale value can be considered ideal
• Select a lower full scale value for abrasive substances (such as liquids with entrained solids): flow
velocity
<
1 m/s (
<
3 ft/s).
• For gas measurement the following rules apply:
– Flow velocity in the measuring tubes should not be more than half the sonic velocity (0.5 Mach).
– The maximum mass flow depends on the density of the gas: formula (
Pressure loss
To calculate the pressure loss, use the
Applicator
Pressure loss in SI units
Pressure loss depends on the fluid properties and on the flow rate. The following formulas can be
used to approximately calculate the pressure loss:
Reynolds number
Re =
2 ·
g
p
n r
· d ·
·
A0004623
Re
³
2300 *
D
r
p = K ·
·
·
0.25
1.85
–0.86
g
n
A0004626
Re
<
2300
D
p = K1 ·
·
+
g
n
K2 ·
·
0.25
2
g
n
r
A0004628
Dr
= pressure loss [mbar]
n
= kinematic viscosity [m
2
/s] g = mass flow [kg/s]
r
= fluid density [kg/m
3
]
d = inside diameter of measuring tubes [m]
K to K2 = constants (depending on nominal diameter)
* To calculate the pressure loss for gases, always use the formula for Re
³
2300.
Pressure loss coefficients
DN
d
K
K1
K2
[mm]
[in]
[m]
8
3/8
5.35
×
10
–3
5.70
×
10
7
7.91
×
10
7
2.10
×
10
7
15
½
8.30
×
10
–3
7.62
×
10
6
1.73
×
10
7
2.13
×
10
6
25
1
12.00
×
10
–3
1.89
×
10
6
4.66
×
10
6
6.11
×
10
5
40
1½
17.60
×
10
–3
4.42
×
10
5
1.35
×
10
6
1.38
×
10
5
50
2
26.00
×
10
–3
8.54
×
10
4
4.02
×
10
5
2.31
×
10
4
