Proline Promass 83 PROFIBUS DP/PA Technical data
Endress+Hauser 159
Promass H:
DN 8...15: 25 bar or 375 psi; DN 25...50: 16 bar or 250 psi
Promass I:
40 bar or 600 psi
Limiting flow See “Measuring range” section. → Page 147 ff.
Select nominal diameter by optimising between required flow range and permissible pressure loss.
See the “Measuring range” section for a list of max. possible full scale values.
• The minimum recommended full scale value is approx. 1/20 of the max. full scale value.
• In most applications, 20...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).
• 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 → Page 148 ff.
→ Page 147
Pressure loss Pressure loss depends on the properties of the fluid and on its flow. The following formulas can be
used to approximately calculate the pressure loss:
Pressure loss formulas for Promass F, M and E
Pressure loss formulas for Promass A, H and I
Reynolds number
F06-83xxxxxx-19-xx-xx-xx-000
Re ≥ 2300
1)
F06-83xxxxxx-19-xx-xx-xx-001
Re < 2300
F06-83xxxxxx-19-xx-xx-xx-002
∆p = pressure loss [mbar]
ν = kinematic viscosity [m2/s]
g = mass flow [kg/s]
ρ = fluid density [kg/m3]
d = inside diameter of measuring tubes [m]
K...K2 = constants (depending on nominal diameter)
1) To compute the pressure loss for gases, always use the formula for Re ≥ 2300.
Reynolds number
F06-83xxxxxx-19-xx-xx-xx-004
Re ≥ 2300
1)
F06-83xxxxxx-19-xx-xx-xx-005
Re < 2300
F06-83xxxxxx-19-xx-xx-xx-003
∆p = pressure loss [mbar]
ν = kinematic viscosity [m2/s]
g = mass flow [kg/s]
ρ = fluid density [kg/m3]
d = inside diameter of measuring tubes [m]
K...K3 = constants (depending on nominal diameter)
1) To compute the pressure loss for gases, always use the formula for Re ≥ 2300.
d
m2
Re
&
86.085.125.0
mKp
&
225.0
2
1
mK
mKp
&
&
d
m4
Re
&
2
75.075.125.0
3 mK
mKp
&
&
2
3
1
mK
mKp
&
&
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