Flowmeter for air conditioner
ONE-TOUCH FLOW Ⓡ

CFW2000 Series
PORTABLE AND DETACHABLE
GENERAL
The CFW2000 is the liquid flowmeter mainly designed for airconditioner. The ﬂ ow rate is detected by the diﬀerential pressure
which is created by a Pitot tube inserted into the pipe.
As the indicator is compatible with 4 different line sizes as per
customers choice, one indicator can be commonly used for
4 different pipes by just installing the fixing nozzles on them.
It saves space and cost for the services where no continuous
monitoring is required. Thus, the portable and detachable
in dic ato r,

O N E -TO U C H F LOW

is m ost suita ble fo r th emeasurement of cold and hot water for the air conditioning
system in collective housings , of fice buildings a nd otherfacilities.

FEATURES❏ Portable indicator is detachable with one touch action❏ Just weld a 20 mm (3/4 inch) socket in the existing pipe andscrew the ﬂowmeter into the socket❏ Minimum pressure loss
60°
C hot water in red and 7°
C cold water in blue with doublescales❏ For both horizontal and vertical pipes❏ One indicator can be commonly used for 4 diﬀerent pipes.
❏ Light weight, cost eﬀective and quick delivery

Dew prevention cover(option)

MEASURING PRINCIPLE
The Pitot tube inserted into the pipe which have two pressure
inlets, one for the total pressure (dynamic + static pressure) andthe other one for static pressure only. The liquid is introduced into
the flowmeter as a bypass line by the pressure difference of thetotal and static pressure as shown by an arrow ← in the following
schematics. The flow going through the tapered tube makes theﬂoat stay at a position on the scale corresponding to the total ﬂow
rate in the pipe.
The dew prevention
cover is detachable
with one touch action.
Indicator
Tapered tube

STANDARD SPECIFICATIONS

Float・Measuring liquid: Water, Cold water, Hot water・Main pipe size
: 20 mm (3/4") to 450 mm (18")
Pitot tube
・Indication accuracy: ± 5% (F.S.)
Staticpressure inlet ・Max. operating pressure
CFIW2 □ 2 □ - □□□□ -10 1.0 MPa
CFIW2 □ 2 □ - □□□□ -20 2.2 MPa
・ Operating temperature : 0 to 80°
CThe operating temperature is typical one which may
cha nge a c c ording to o p erating or enviro nment
conditions. (Use the lining or plastics pipe within its
Pipe
allowable temperature).
Pressure inlet・MassIndicator : CFIW2 □ 2 □Approx.1.3 kg
Fixing nozzle CFNW □□□ Approx.1.0 kg
TG-F981-E06
5th edition Mar 2020 K
1st edition Jan 2003 K

CFW2000 Series PORTABLE AND DETACHABLE

MODEL CODE

STANDARD SCALE RANGEThe CFW2000 “ONE-TOUCH FLOW” is composed of :- A CFIW indicator- A CFNW fixing nozzle- A three-way socket (for main pipe size 20 to 32 mm) or a socket forwelding piping (for main pipe size 40 mm or larger)Ɣ&),:,QGLFDWRU
CFIW2□ 2 □ -□□□□ -□0
Installation 2type4
Indicator
2
calibration
1
Scale range
2-1000
-2000
-3000
-4000
-5000
-6000
Note 1-7000
Main pipe size and-8000-9000
combination of 4
-A000
measuring pipe sizes
-B000
-C000
-D000
-E000
-F000
-G000
-10
Pressure rating-20
Version-B/□□□

Description
Horizontal
Vertical-B

Additional function

Scale range 1 See right table
Scale range 2 See right table
Scale for 20 mm
Scale for 25 mm
Scale for 32 mm
Scale for 40 mm *1 PVC lining
Scale for 50 mm type isavailable only
Scale for 65 mm for the size 32
Scale for 80 mm mm to 150
Scale for 100 mm mm with 1
Scale for 125 mm MPa class.
Scale for 150 mm
Scale for 200 mm
Scale for 250 mm
Scale for 300 mm
Scale for 350 mm
Scale for 400 mm
Scale for 450 mm
1 MPa class
2 MPa class
Version code
/DEG
Degreasing treatment/PL
For the PVC lining pipeblank Not provided
欄/Z Provided

Note1
Example ① The combination of 4 measuring pipes:
The combined code of 4 measuring pipes for 25, 50, 200, 300 mm is “-25BD”.
The whole model code becomes “CFIW2□2□-25BD-□0-B”.
Example ② The combination of 3 measuring pipes or less:
The combined code of 3 measuring pipes for 100, 125, 150 mm is “-89A0”.
The whole model code becomes “CFIW2□2□-89A0-□0-B”.

Ɣ&)1:)L[LQJQR]]OH□□□

Mainpipe size

020
025
032
040
050
065
080
100
125
150
200
250
300
350
400
450

Pressure rating
Version-□-B/□□□-1-2-B/CFT/CFSOption/DEG/COV/BC6/PL

Additional function

2This can berotated freely
Scale 3

Scale 27°C and 60°C water, double scale

Option

CFNW

Scale 4
One piece of CFIW indicator is Tapered tube
able to have 4 different scale
ranges. But for the cases ofPVC lining pipe (option code: Scale 1/PL) and pipe with
non-standard inside diameter,
Sight glass
one indicator has one scalerange.

TOKYO KEISO CO., LTD.

Description
20 mm
25 mm
32 mm
40 mm
50 mm
65 mm *1 PVC lining type isavailable only for the80 mm size 32 mm to 150 mm.
100 mm
125 mm
150 mm
200 mm
250 mm
300 mm
350 mm
400 mm
450 mm
1 MPa class
2 MPa class
Version code
Three-way socket for 20 to 32 mm
Applied to only 1 MPa class
Socket of welding for 40 mm or largerpipes
Degreasing treatment
Dew prevention coverMaterial of fitting is CAC406
For PVC lining pipeblank Not provided/ZProvided

ƔThe example of standard specification[example 1] Code number of CFIW2221 indicator with
Scale range 1 for 25, 50, 200, 300mm sizes has[CFIW2221-25BD-□ 0-B].
Scales can be chosen. The graduation example isshown in right drawing.

50A OT
COL25A
15 DHOT COLDH0500
050150ƔThe example of PVC lining pipe or non-standardpipes[example 2] Code number of CFIW2222 indicator withscale range for 50 mm of PVC lining pipe has[CFIW2222-5000-10-B/PL] and likewise with scalerange for 50mm of non-standard pipes has[CFIW2222-5000-10-B/Z].
It has one graduation (for one size of pipe) as shownat the right drawing.

COL50A
D30 HOT0300

STANDARD SCALE RANGE TABLESize
mm202532
40
50
65
80
100
125
150
200
250
300
350
400
450

CFIW2□2□
Scale range L/min
Scale range 1
Scale range 2inch*2*1, *2
12to100
10 to 60
3/4
[8 to 75]
[6 to 45]
18 to 150
15 to 100
1
[13 to 120]
[10 to 75]
25 to 180
35 to 280
11/4 [25 to 220]
[20 to 140]
11/2
35 to 300
30 to 180
260 to 500
50 to 300
21/2 100 to 800
80 to 500
3150 to 1200
120 to 700
4250 to 2000
200 to 1200
5400 to 3000
300 to 2000
6600 to 4500
400 to 2800
81000 to 8000
700 to 4800
10 1500 to 12000 1200 to 7500
12 2000 to 17000 1600 to 10000
14 2500 to 22000 2000 to 13000
16 3500 to 28000 2800 to 17000
18 4500 to 35000 3500 to 22000

Inside diameter of pipe mm
1 MPa
2 MPa
PVC lining
class
class
pipe *1*3, *5*4, *5(26)(21.4)(34)(27.2)(43)(35.5)

29.5

41.6
52.9
67.9
80.7
105.3
130.8
155.2
204.7
254.2
304.7
339.8
390.6
441.4

41.2
52.7
65.9
78.1
102.3
126.6
151.0
199.9
248.8
297.9
333.4
381.0
428.6

34.7
46.2
59.7
70.9
95.2
119.7
142.0

*1 PVC lining type is available for the size 32 mm to 150 mm as marked gray.
Its scale range is shown in the column Scale range 2 as marked gray.
Full-scale flow rates for the PVC lining pipe are calculated based on theinner diameter of ESLON® ESLOCOAT LX tee fittings (Sekisui ChemicalCo., Ltd). The maximum rating is 1 MPa. If you use other fittings, additional
calibration is needed. Please check “D” and “L” in the figure at the end of
this document and the kind of pipe, and then contact us.
*2 Scale ranges of 20, 25, 32 mm size for 2 MPa class are shown in thebrackets in above table.
*3 The inside diameter of main pipe of 20 to 32mm in 1MPa class is based on
the three-way socket (JIS B 2301).(The three-way socket shall be attachedupon request.)*4 The inside diameter of main pipe of 20 to 32mm in 2 MPa class is based onthree-way socket (Sch 40). The three-way socket is supplied by customer.
*5 The inside diameter of main pipe more than 40mm in 1 MPa class is basedon SGP (JIS G3452) Carbon steel pipe for piping, and the inside diameter in2 MPa class is based on the carbon steel pipe for STPG (JIS G 3454 Sch40) for pressure piping.

TG-F981-E06

CFW2000 Series PORTABLE AND DETACHABLEDIMENSION AND MATERIALƔ Indicator (CFIW222□ )3232853877331111No.

Parts name①

Tapered tube

②FloatMaterial
Heat-resistantglass
Titanium

Upper body

SCS 14③⑤Lower (CFIW2200) SCS14/CAC406
body (CFIW2400) CAC406
Strainer
SUS316
O ring
NBR

101

122⑥Sight glass

66⑦5⑧4⑨Cap
Air eliminationplug
Cap nut( 250)

220

10227

195

CFIW2□2□-□□□□-□0-B

Ɣ Indicator (CFIW242□ )54④

Heat-resistantglass
SUS316
SUS316
SCS13

⑪

Cover
HandleNo.

Parts name①

Fitting②

Pitot tube

SUS316③O ring

NBR④ValveAxis

SCS14SUS316⑤O ring
Cap nut

NBR
SCS13Pitot tube hole⑥

Cover cap

ABS(Upstream)⑦Socket

SS400*2⑧

Three-way socket
Dew prevention
cover

⑩

93

3

SUS304
SUS30432

CFNW□□□-□-B

3053

930

( ĳ 52)( ĳ 52)

Ɣ CFNW fixing nozzle

Flow direction

68

Dew prevention cover（Option）⑨
Length of Pitot tube “I”

6

4CloseSize*4The handle is not fitted in.
(Insert the handle to operate the valve)

20 mm3025 mm

32

532 mm

4265

40 mm

63

70

50 mm

69

76

65 mm

79

88

80 mm

88

98

100 mm102

115

312R3/ 4( ĳ 52)

Open( 16)( 22)50( 110)ｌ(*4, *5)88*5125 mm117131150 mm

133148200 mm98250 mm

113300 mm

128Material
SCS14*1

FCMB*3
EVA*1 CAC406 is available as the material of
fitting on request. Optional code :/BC6*2 The socket made of SS400 is supplied as
an accessory upon request. The socket
made of other than SS400 is supplied bythe customers.
*3 For the 1MPa class, three-way socket issupplied upon request. Its material otherthan FCMB is provided by customers. Forthe 2 MPa class, the part made of propermaterial such as S25C is selected andprovided by customers considering pipe
sch40.

350 mm135*6 The dimension of “I” in Pitot tube is typical one which is our standard. The
400 mm 151
dimension may change depending on your pipes or sockets. In such case please
450 mm 166
check “D” and “L” in the figure at the end of this document and the kind of pipe,
and then contact us.
*4 For SGP and STPG pipes*5 For PVC lining pipes⑨ Dew prevention cover(Model code : /CFT)(Model code : /COV)

20 to 32 mm, only for 1 MPa class
Dimensions of three-way
socket (JIS B 2301)
Size
ĳD

Rc3/ 439BdA

B

20 mm Rc3/4

333325 mm Rc1

353632 mm Rc11/4

3641

ĳ 110

A

ĳ 34. 540 mm or more, common to 1
and 2 MPa classes
3/ 4⑧ Three-way socketA⑦ Socket(Model code : /CFS)

2- d
70

TG-F981-E06

TOKYO KEISO CO., LTD.

3

CFW2000 Series PORTABLE AND DETACHABLE

INSTALLATION, STRAIGHT RUNS AND ASSEMBLY DRAWINGƔ Horizontal installation（CFW2200 series）

Ɣ Vertical installation (CFW2400 series)
Branch 3/4☆
☆

Three-way socket
20 to 32 mm★

★

Socket 3/4☆
☆

Straight pipe40 to 450 mm

☆
☆

☆

☆

Branch 3/4
Three-way socket
20 to32 mm★
★

★
Socket 3/4★

Straight pipe 40 to 450 mm★

Ɣ Assembly drawing★

Indicator

PipingIndicator

O ring(S31.5)

SocketFitting
Set screw
Cap nut

Valve

Fixing by screw
Valve
ing
rewc
Sby
ing
Fix

Welding
Fixing by screw

rewscO ring
(S31.5)
Cap nut
Set screw

ĳ 35

by
ing
xi
F

rewscngldi
We39Ɣ Installation1) Keep the upstream and downstream straight runs as follows.
Pipe sizeUpstream

Downstream

32 mm or less（☆）

10D or more

5D or more

40 mm or more（★）

5D or more

3D or more

Fitting
Screwing
Welding

SocketNote : D is the inside diameter of main pipe.
Piping

4TOKYO KEISO CO., LTD.

Welding392) To install the flowmeters, drill a hole of 35mm diameter into the pipe
having more than or equal to 40mm diameter. Use the three-way socketfor the pipe having 20 to 32 mm diameter. Select and drill the hole atright place so that the final fixed posture of tapered tube should bevertical.
3) Weld the socket to the drilled hole. The centerline of the socket must be
perpendicular to the one of the pipe.
4) Screw the CFNW fixing nozzle into the welded socket to complete theinstallation.

ĳ 35

TG-F981-E06

CFW2000 Series PORTABLE AND DETACHABLE

SUGGESTIONSHOT AND COLD INSULATION❏ Install the ﬁxing nozzles on the main pipes in advance. Measure
the ﬂow rate by ﬁxing the indicator on them when required. Oneindicator can measure the flow rates of maximum 4 different
sizes of the standard pipe. However it measures one ﬂow rate ofone size of non-standard pipe.
Following table shows the indicator commonly used for thecombination of measuring pipes.

❏ When the ﬁxing nozzle is insulated up to the end of the cap nut
as shown in the drawing below, the ﬁxing nozzle may get a dew
condensation due to the fluid temperature. To prevent a dew
condensation the dew prevention cover can be provided onrequest. See page 3. The distance between the end of cap nut
and the central end of the cover cap is 53 mm. Do not insulate
this part. If this part is insulated, the dew prevention covercannot be put on.

Can anindicator beusedcommonly?
Yes
A combination of three-way sockets 20 to 32mm
(JIS B2301) and 40 to 450 mm SGP pipes (JIS For 4 diﬀerent
sizes of pipes
G3452)*6Yes
A combination of three-way sockets 20 to 32mm(for Sch.40 pipes) and 40 to 450 mm STPG pipes For 4 diﬀerent
sizes of pipes(JIS G3454 Sch 40)*7
・A mixed combination of above *6 and*7
No・Three-way sockets with 40 mm or larger
An indicator
・Non-standard pipes in inside diameters
per・Resin pipes
one pipe size
・Lining pipes in general
Kinds of measuring pipes❏ The model CFIW2 □ 2 □ - □□□□ -10 ﬂowmeter is calibrated
based on the inside diameter of JIS G3452 SGP. The model
CFIW2 □ 2 □ - □ □ □ □ -20 flowmeter is calibrated on JISG3454 STPG Sch.40. If pipes are diﬀerent from above, consult
TOKYO KEISO. Speciﬁc calibration is required.
❏ Run the fluid fully in the pipe. Otherwise it could not bemeasured.

53

Central end of cover cap
End of cap nutInsulation

Dew prevention
cover

Put on the dew prevention coverby pushing forward.
After putting on the coverThree-way socket 20 to 32 mm

Branch 3/4
Cover cap
One indicator can measure the ﬂow rates ofmaximum 4 diﬀerent sizes
Straight pipe 40 to 450 mm

HOW TO MEASURE
1) Open the cap of the CFNW ﬁxing nozzle.
2) Insert the CFIW indicator into the CFNW nozzle, and fix theCFIW indicator by tightening up the cap nut. At this time, be
careful that the tapered tube of CFIW indicator must bevertical. Conﬁrm that the scale range corresponds to the size ofthe main pipe.
3) Move a valve handle to Open when installation is completed.
Liquids run through indicator and it starts to measure the flowrate.
4) Conduct this in reverse procedure to ﬁnish measurement

HOW TO STORE AFTER MEASURING
The CFIW indicator has been delivered with the carrying case as
shown below. Store the indicator in it after measuring the ﬂow rate.
An air elimination plug, a wrench used for opening and closing
caps on the top and bottom of indicator, a brush for cleaning
the tapered tube are contained in the case. Use them for themaintenance.

Socket 3/4

Wrench forindicator

Cover capCarrying case

Brush forindicator

TG-F981-E06

TOKYO KEISO CO., LTD.

5

CFW2000 Series PORTABLE AND DETACHABLE

LINING PIPINGORDERING INFORMATION❏ Only scale range 2 is available for the pipe lined with PVC. The
flow rate is based on when the flow runs through the inside
diameter of the pipe which consists of a tee joint of the Eslo
coat LX made by Sekisui Chemical Co.'s Eslon ®. If you use
other ﬁttings, additional calibration is needed. Please check Dand L in the drawing below and contact us.
❏ When the main pipe size is between 32 mm and 150 mm,
provide either one of the following tee joint and bushingassembly to make the connection size 20 mm:‒ A tee joint with 25 mm in branch line + A bushing with 25 mm
x 20 mm‒ A tee joint with larger than 25 mm in branch line + One or morebushings in series to make the ﬁnal connection size 20 mm
For further consultation inform us of the dimension L in thefollowing drawing❏ Inform us the kind of your pipe and installation method wheninquiring or ordering the ﬂowmeter.

φD32mmor moreBushing(R1×Rc3/4)

CAUTIONS ON USING CFW2000 SERIESCAUTION
This flowmeter has a glass tube which is subject to the pressure
from the piping. Avoid the use of CF W2000 Series for thefollowing services.
1. Liquid services subject to impulse pressure in the process.
2. Secondary accidents might occur due to the breakage of glassin such services :• Toxic ﬂuids such as poisons, stimulant and narcotics• Flammable ﬂuids• Explosive ﬂuids
3. Any services where scattering of glass fragments might cause aserious injury.
4. The installation places of the flowmeters where breakage ofglass might be caused by the accidents from the surrounding
piping or equipment.
5. On-off operation where breakage of glass might be caused by
the collision of the ﬂoat inside meter due to the abrupt changeof ﬂow.
6. Services where the heat shock by abrupt change of temperature.

LOTHER PIPING❏ Available for other piping. Consult factory for details. Inform ofthe type of piping and dimension of L and D of thefollowing ﬁgure.

Rc3/4

φDL

* Specification is subject to change without notice.

Head Office : Shiba Toho Building, 1 – 7 – 24 Shibakoen, Minato-ku, Tokyo 105 – 8558
Tel : +81-3 – 3431 – 1625 (KEY) ; Fax : +81-3 – 3433 – 4922
e-mail : overseas.sales@tokyokeiso.co.jp ; URL : https://www.tokyokeiso.co.jp
6TG-F981-E06