Oval ALTImass CA004 - 3.1.2 General Performance

L-737-3-E
8
3.1.2 General Performance
Item Description
Model CA004
Flow rate
Max. allowable rate 300kg/h
Max. service rate 120kg/h
Min. setting rate 6kg/h
Guaranteed min. rate 2.4kg/h
Accuracy
Less than 9.6kg/h ±0.05% of max. allowable rate
9.6kg/h or above to 300kg/h or less ±0.5% of RD
Repeatability
Less than 9.6kg/h ±0.025％ of max. flow rate
9.6kg/h or above to 300kg/h or less ±0.25% of RD
Analog output accuracy ±0.1% of FS added to each accuracy
Pressure loss
(Reference)
Water: at Max. allowable
rate
1.15MPa
CAUTION:
1. Since the casing of sensor unit is not pressure resistant, the withstanding pressure rating
of the casing is not indicated. To afford adequate protection to personnel, an Rc 1/4 boss is
provided in an area shown in Fig. 4.1; Use customer's discretion in providing a rupture disc,
pressure switch, etc. Rupture disc pressure rating and pressure switch setting is 7 MPa (G).
A precaution to remember: removing the Rc 1/4 plug with the boss pointing downward may
result in the leakage of inert argon gas. In this case, refill with an inert gas, such as argon.
For further details of treatment, consult OVAL.
2. Density measurement and volumetric flowmetering are unacceptable.
3.1.3 Pressure Loss
◎How to determine pressure loss (liquids only)
(1) Find the pressure loss coefficient C from the flow rate (kg/h) and viscosity of parameter (mPa・s). Dividing this
value C by specific gravity d (1 for water) gives the pressure loss, thus
(2) For high-viscosity liquids not shown in the graph, calculate the pressure loss by using the following equation:
where ΔP
2
: Pressure loss of high-viscosity liquid (MPa)
μ
2
: Viscosity of high-viscosity liquid (mPa･s)
d : Specific gravity of high-viscosity liquid (1 for water)
μ
1
: Maximum viscosity shown in the graph (mPa･s)
C : Pressure loss coefficient found from the maximum viscosity curve at a given flow rate (kg/h)
(3) For pressure loss of gases, consult OVAL.
󱾀CA004
Pressure loss coeff., C
Flow rate (kg/h)
Fig. 3.1
ΔP
2
＝C× ×
1
d
μ
2
μ
1
d
C
ΔP＝
（MPa）
0.00001
0.1 1 10 100 1000
0.0001
0.001
0.01
0.1
1
10
100
1000mPa・s
100mPa・s
10mPa・s
1mPa・s
0.01mPa・s