Koganei FA Series, Инструкция по эксплуатации

Страница: 6 / 24

- 5 -
Handling Instructions and Precautions
Note 4:Contact Koganei about 1 1/2B and 2B size filters and mist filters.
5: Straight pipe section required connecting a filter with the same bore diameter as the flow meter.
6: An example of connecting contraction piping on FAS-002 (product specification range
of within ±3% FS) is shown below.
When connecting piping one size larger (such as 1/2B on FAS-002), use a prescribed
value of +5D for the upstream straight pipe section* and +5D for the downstream
straight pipe section.
* Length when piping one size larger than the prescribed value is connected.
7: An example of connecting expansion piping on FAS-005 (product specification range
of within ±3% FS) is shown below.
Do not connect piping with a diameter smaller than the connection pipe bore diameter
without straight section piping. Even if flow in the main channel itself is normal direction
flow, bypass unit back flow can produce a negative reading. Also, the readout may
show an extremely low flow rate instead of the actual flow rate.
When connecting piping one size smaller (such as 1/4B on FAS-005), use a prescribed
value of +10D for the upstream straight pipe section* and +5D for the downstream
straight pipe section.
* Length when piping one size smaller than the prescribed value is connected.
8: The illustration below shows single-elbow and double-elbow configuration.
9: Install the flow rate adjustment valve downstream from the flow meter.
10: The distance from the flow meter to an elbow should be greater than the prescribed
length. Piping from the regulator to the flow meter can be either tube piping or bent by
an elbow. However, when connecting to the flow meter with an elbow be sure to
provide the straight pipe section required by the elbow. Provide distance when
installing a filter and mist filter between the flow meter and elbow.
5D
FAS-002
1/4B 3/8B 3/8B
10D 5D
FAS-002
1/2B 1/4B 1/4B 1/2B
15D
FAS-005
1/2B 3/8B 3/8B
25D 5D
FAS-005
1/2B 1/4B 1/2B 1/4B
10D
Single elbow
10D
Double elbow
Elbow
Distance from flow meter
FAS-002: 200 D or more
Other equipment: 30 D or more
Straight pipe
minimum of
10 D
Regulator
Filter
・ Whenever there is the risk of foreign matter (dust, sediment, oil mist, etc.) being
mixed in with the measured fluid, be sure to install upstream from the FA Series Flow
Meter a filter and mist filter that can remove foreign matter measuring 1μm or larger.
・ Periodically inspect and replace filters, and perform any other necessary filter maintenance.
Specification accuracy and straight pipe section
Install the FA Series Flow Meter so the arrow marked on its label is pointed in the same
direction as the fluid flow direction. When connecting different diameter tubing, valves,
filters, and other equipment, provides straight pipe in accordance with the information in the
table below.
A "straight pipe" is straight piping that is the same bore diameter as the flow meter. The
following types of pipes are suitable as straight pipe: carbon steel pipes for ordinary piping
(JIS G3452), carbon steel pipes for pressure service (JIS G3454), Schedule 40 or less, and
stainless steel pipes (JIS G3459), Schedule 40. Note 1.
For equipment not included in the table below, provide 15D or larger straight piping when
installing it upstream from the FA Series Flow Meter, and 5D or larger straight piping when
installing it downstream from the FA Series Flow Meter. The letter D represents the bore
diameter. Note 2.
When measuring back flow in addition to normal flow, the same length as the upstream
straight pipe is required downstream from the FA Series Flow Meter.
Pipe, connected equipment Connection
location
Straight pipe section for FA Series Flow Meter
Specification
range
Within (±3%FS)
Accuracy
Within ±5%FS
Mist filter
For FAS-002, FAS-005, FAS-030 Notes 3, 5
Upstream from
flow meter
10D Not required
Mist filter
For FAS-060, FAS-120 Notes 4, 5
Upstream from
flow meter
20D Not required
1 size larger bore diameter piping
(contraction piping connection)
FAS-002 3/8B → 1/4B
FAS-005 3/4B → 1/2B
FAS-030 1 1/4B → 1B
FAS-060 2B → 1 1/2B Note 6
Upstream from
flow meter
5D Not required
Downstream
from flow meter Not required
Not required
More than 1 size larger bore
diameter piping
(contraction piping connection)
FAS-120 2 1/2B → 2B Note 6
Upstream from
flow meter
10D 5D
Downstream
from flow meter
5D 5D
1 size smaller bore diameter piping
(expansion piping connection)
FAS-002 1/8B → 1/4B
FAS-005 3/8B → 1/2B
FAS-030 3/4B → 1B
FAS-060 1 1/4B → 1 1/2B Note 7
Upstream from
flow meter
15D Not required
Downstream
from flow meter Not required
Not required
More than 1 size smaller bore
diameter piping
(expansion piping connection)
FAS-120 1 1/2B → 2B Note 7
Upstream from
flow meter
25D 10D
Downstream
from flow meter
5D 5D
Single elbow Note 8
Upstream from flow meter 10D Not required
Downstream from flow meter Not required Not required
Double elbow Note 8
Upstream from flow meter 10D 10D
Downstream from flow meter Not required Not required
Ball valve
(Full bore type, fully open)
Note 9
Upstream from flow meter 20D 10D
Downstream from flow meter 10D 5D
Regulator
Note 10
FAS-002
Upstream from flow meter 200D Not required
Downstream from flow meter 10D Not required
Regulator Note 10
FAS-005, FAS-030, FAS-060,
FAS-120
Upstream from flow meter 30D Not required
Downstream from flow meter 5D Not required
Air filter Upstream from flow meter 25D Not required
Note 1: Note that accuracy deteriorates when piping carbon steel pipes for
pressure service (JIS G3454) or stainless steel pipes (JIS G3459),
larger than Schedule 40 is connected. A larger schedule results in a
smaller pipe inside diameter which causes a pipe effect and
deteriorated accuracy.
2: The approximate D (bore diameter) for FAS-002 (1/4B) is 8 mm, for
FAS-005 (1/2B) is 15 mm, for FAS-030 (1B) is 25 mm, for FAS-060 (1
1/2B) is 40 mm, and for FAS-120 (2B) is 50 mm.
3: Always provide a filter upstream from the mist filter.