Azbil MVF Series, Руководство пользователя

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Item Specifications
MVF050 MVF080 MVF100 MVF150
Wiring port Connection port: 2 locations, Connection standard: G1/2 female thread
Accessories: 2 water-proof glands attached
Sealing IP67 (JIS C 0920 and IEC 529 Water-proof and dust-proof structure on the assumption of
outdoor installation)
Applicable standard EN61326-2-3: 2006, EN61326-1: 2006
Mass (kg)*
8
7 (6.3) 8 (6.6) 10 (9) 23 (17)
*1. Oxygen can be used only for models with degreased gas-contacting parts.
*2. Flow rate measurement range at a fluid temperature of 23 °C.
*3. The “normal” shows a volumetric flowrate (m
3
/h) after correcting with 0 °C, 101.325 kPa.
For other conditions, see “Tables for accuracy after temperature and pressure correction (in air)” (page 24).
*4. The volumetric flowrate accuracy differs with an operating pressure and a flowrate range.
For details, the “Tables for specifying volumetric flow rate accuracy (in air)” (page 23).
*5. Volumetric flow rate accuracy at a fluid temperature of 23 °C and fluid pressure of 0.01 MPa
*6. The data is an example of the MVF_ _ _0 with the pressure sensor of 0-1.0 MPa.
For other models, see “Tables for accuracy after temperature and pressure correction (in air)” (page 24).
And, using a gauge pressure sensor, atmospheric pressure fluctuation is not included.
*7. The integrated flowrate display becomes “00000000” after counting up to “99999999.”
For details about setup, refer to “MVF050/080/100/150 Micro Flow Vortex Gas Flowmeter User’s Manual for Communications,” manual No.
(CP-SP-1183E).
*8. The number in parentheses is the mass if the body material is SCS13A.
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Specifying accuracy
Velocity of measurable specifying accuracy:
From the large one which the velocity at Re 3500 or 0.3 m/s,
to the velocity of 30 m/s
Minimum measurable velocity:
The large one which the velocity at Re 3500 or 0.3 m/s
Maximum measurable velocity:
36 m/s
See the tables for specifying accuracy on pages 23 and following. The accuracy ta-
bles show the ranges when the gas is air. To convert to other application conditions,
calculate as shown below.
The Reynolds number (Re) used below is calculated using the formula
Re = (V × D)/ν.
V: velocity (m/s)
D: typical length (internal diameter of the MVF body (m))
MVF050 : 52.5 mm, MVF080 : 78 mm, MVF100 : 96.8 mm, MVF150 : 142 mm
ν: Kinetic viscosity of the fluid (m
2
/s), ν = μ/ρ
For instance, in the case of air (dry air) at 0 °C and 101.3 kPa,
Viscosity μ =17.24 × 10
–6
Pa·s
Density ρ =1.293 kg/m
3
From these conditions, the kinetic viscosity ν =13.35 × 10
–6
m
2
/s.
Also, in the case of air (dry air) at 23 °C and 700 kPa,
ν =1.883 × 10
–6
m
2
/s.
As a calculation example, we will use the following conditions:
Installed flowmeter: MVF0800 (operating pressure range 0-1.0 MPa)
Fluid: air (dry air)
Operating pressure: 700 kPa
Fluid temperature: 23 °C
Atmospheric pressure: 101.3 kPa
Chapter 5. SPECIFICATIONS
19