Compact indicator for small flow measurementwith HART® communication, ideal for devices, test
plants and general industrial processes

AM3000 Series

MICRO FLOWMETEROUTLINE
The AM3000 series micro flowmeter is a metal tube flowmeterfor small flow measurement. The all-metal construction ensures
precise measurement even in high-temperature and high-pressureservices.

External tube type

Thanks to its compact design, the AM3000 is suitable for assembling
onto various devices. It can also be used for small-bore industrial
processes.
As outputs, current output and current output with HARTR
communication are available.

Internal tube type

Local indication, pneumatic output, and alarm output functions
are available in the M-900 series.

FEATURES

Flameproof type

Flange type

❏ Compact design
Small and light design facilitates installation onto panels aswell as process pipings.
❏Suitable for corrosive and opaque fluids
Non-corrosive materials such as titanium and MA276 are available to meet your specifications.
❏HARTR communication protocol❏Explosion-proof construction

OPERATING PRINCIPLE
The flow path has a tapered part. A float containing a magnet is
located in the tapered tube. Fluid flows from the bottom of theflowmeter and goes upward through the tube. The differential
pressure produced by the float and the tapered tube pushes thefloat upward, and the float stops when the weight of the float
and the differential pressure balance. In other words, the positionof the float corresponds to the flow rate. The movement of themagnet in the float is detected by the magnetic coupling, whichconverts it into the movement of the pointer.

Certified with several explosion-proof standards

Connection(TIIS, KOSHA, NEPSI, ATEX, IEC-Ex)

Indicator

OUT❏ Protection rating: IP67
Scale plate
Pointer

Float(containing
a magnet)
Tapered tube
Float rodIN

TG-F2289-E02
3rd edition Jun 2024 K
1st edition Sep 2022 K

AM3000 Series

MICRO FLOWMETERMODEL CODE
Function 1 Function 2
The quotation may indicate the Basic model and Function 1 code.
code
code
AM3
□ □ □ − □ □ □ □ □ − □ ／ □ □ ／ □ □Specifications
1
Bottom → Top
2
Bottom → Top side
3
Bottom side → Top sideFlow
direction 4
Bottom side → Top
5
Bottom rear → Top rearZ
OthersAnalog current output
Function of E
indicator
H
Analog current output with HARTR communication
W
Dust-tight, immersion-proof/non-explosionproof
Explosion-proof E
FlameproofS
Intrinsically safe
− 0 1
SUS304− 0 2
SUS316
Connection material− 0 3
SUS316L− Z Z
OthersM S
Metric screw threads (F/M thread)
R S
Taper threads (F/Rc thread)
N S
Taper threads (F/NPT thread)
J 1
JIS 10 K
J 4
JIS 20 K
Connection rating
A 2
ANSI Class 150
A 5
ANSI Class 300
P 2
JPI Class 150
P 5
JPI Class 300
Z Z
OthersT
Screw
R
RF flange
Connection
F
FF flange
Z
Others− M
8 mm or 1/4″
− O
10 mm or 3/8″
− 1
15 mm or 1/2″
Connection size
− 2
20 mm or 3/4″
− 3
25 mm or 1″− Z
Others／ D L
Liquid damper／ D U
Gas damper
Additional／ V L
Needle valve at inlet
Functional construction
function 1／ V U
Needle valve at outlet／ P N
Panel mounting type
／ E 1 Analog current output
Output／ H 1 Analog current output with HARTR communication／ C E NEPSI／ E E ATEX
Flameproof enclosure／ J E TIIS
／ K E KOSHA／ X E IEC-Ex
Additional／ C I NEPSI
function 2／ E I ATEXIntrinsically safe enclosure／ J I TIIS
／ K I KOSHA／ X I IEC-Ex／ M 2 M20 × 1.5 (F)Cable entry／ G 1 G1/2 (F)／ N 1 NPT1/2 (F)／ O L Oil-free treatment
Cleaning／ W L Water-free treatment
Painting／ P S Special painting
Test／ L T Airtight test
Option／ P C Metallic waterproof connector／ F G Flameproof cable gland (necessary for TIIS flameproof )Accessory／ M G Magnet strainer／ A C Others
Double scale, output for the main scale (Current output and current／ W S
output with HARTR communication only)
Double scale
Special spec.
Double scale, output for the main and sub scales (Current output／ W E
and current output with HARTR communication only)
Others／ Z Z Others
Basic model

2

Material/Connection code

TOKYO KEISO CO., LTD.

TG-F2289-E02

AM3000 Series MICRO FLOWMETER

Specifications
The AM3000 series is available in the following types based on indicators, fluids, flow range, and fluid temperature.
For details, see individual specifications. For other specifications, consult Tokyo Keiso.
Type
Flow range

Standard type
Liquid *1[L/h]
Gas *1[L/h (nor)]

Fluid pressure[MPa]
Fluid temperature[ºC]
Indication accuracy *5[%F.S.]
Rangeability
Screw
Connection
FlangeInternal tube type
Indicator
External tube type
Flameproof type

Flow direction

Large-flow type

0.5 to 2

2 to 55 to 1010 to 300

300 to 600

15 to 60 *2

60 to 150

150 to 300

300 to 8,500

8,500 to 17,000

Max. 10 (Option: 20)(Subject to flange ratings for the flange connection)(Max. 2.94 for the types with a liquid damper)
0 to 149*30 to 120(External tube type: –20 to 200 *4)±5±3±5(High-accuracy type: ±3)(High-accuracy type: ±2)
10:2
10:1
1/4, 3/8 (Standard), 1/2
3/8, 1/2 (Standard), 3/4
10A, 15A, 20A, 25A
15A, 20A, 25A
○
○
○
○
○
○
×
○
○
○
○
○
×
○
○
○
○
○
• Bottom → Top (Types with a liquid damper not available)• Bottom → Top side (Types with a liquid damper not available)• Bottom side → Top side
• Bottom side → Top• Bottom rear → Top rear

*1 Liquid: water (density of 1.0 g/cm3, viscosity of 1.0 mPa·s), Gas: air (0ºC, 0 MPa)
*2 Models with a damper are not available.
*3 Allowable thermal shock: 80ºC or lower*4 Models with a damper are not available. The fluid temperature must be –15 to 150ºC for the types with a needle valve.
*5 Flowmeters for liquids with the specified indication accuracies may not be available depending on the liquid viscosity.

TG-F2289-E02

TOKYO KEISO CO., LTD.

3

AM3000 Series

MICRO FLOWMETER

STANDARD SPECIFICATION● Measuring fluid
Liquids and gases[The models with a damper are recommended for low-pressure gases (less than 0.3 MPa) in the flow range of 60 L/h (nor) or higher.]● Viscosity limit in liquid measurement
Flow range

Viscosity limit (mPa·s)

up to 2 L/h

1

2 to 20 L/h

5

20 to 50 L/h

1050 L/h or higher

20● Materials
Part nameStandard

Alternative

Body

SUS304/SUS316L

SUS304, SUS316 (SCS14), Equivalent to MA276 *1, Titanium *1

Tapered tube

SUS316L *2

SUS304, SUS316, Equivalent to MA276 *1, Titanium *1

Float

SUS316L/PTFESUS304, SUS316, Equivalent to MA276 *1, Titanium *1／ PTFE*1 Not applicable to flowmeters with a gas damper.
*2 Heat-resistant glass, FEP, or PTFE is available for liquids and gases with flow range of less than 2 L/h and 60 L/h (nor),respectively. (External pressure-resistance is not required for these flow ranges.)● Painting color
Painting

4

Color

Indicator body

Jade green

Munsell 7.5BG4/1.5

Indicator cover,transmitter

Light grayMunsell N7.5

TOKYO KEISO CO., LTD.

TG-F2289-E02

AM3000 Series MICRO FLOWMETER

AM3000/E1 SERIES (LOCAL INDICATOR WITH CURRENT OUTPUT)
AM3000/H1 SERIES (LOCAL INDICATOR WITH CURRENT OUTPUT AND HARTR COMMUNICATION)
AM3000/E1 series indicates flow rates with a pointer and scale plate, and outputs electric signals (4–20 mA DC) proportional to the flowrate.
AM3000/H1 series indicates flow rates with a pointer and scale plate, and outputs electric signals (4–20 mA DC) superimposed by digital
signals complying with the HART protocol (multidrop mode).
In addition to the dust-tight and immersion-proof types, intrinsically-safe and flameproof versions will be available in the near future (currently
under consideration).
● Transmitter specifications
Power supply voltage: 10 to 30 V DC (between transmitter terminals) (intrinsically safe version: 10 to 28 V DC)

Current output			

: 4–20 mA DC

				 Effective output range: 4.0 to 21.6 mA. In abnormal conditions, 22.8 mA or 3.75 mA (optional) is				 output.
Allowable load resistance: 830 Ω or less for AM3000/E1 series (580 Ω or less/24 V DC)

				 230 to 830 Ω for AM3000/H1 series (HART communication needs at least 230 Ω)				 Determine the allowable load resistance for each supply voltage by using the formula:				 Allowable load resistance ≤ (Power supply voltage [V] – 10) / 0.024 [Ω]				 The allowable load resistance includes the resistance in the wiring.
Output accuracy			: ±1.0% F.S. (against the flow scale)

Temperature change effect: 10 µA/℃

Low cut-off			

: 0 to 20% F.S. (default: 7% F.S.)

Damping			: 0 to 20 s (default: 1 s)

Cable entry			: Dust-tight and immersion-proof, intrinsically-safe: M20 × 1.5, G1/2, NPT1/2, waterproof connector				 Flameproof: M20 × 1.5, NPT1/2, flameproof cable gland				 Note: For the TIIS flameproof construction, use the EXPC-16B flameproof cable gland (Shimada					Construction			

Electric Co.). The cable diameter is 6 mm to 12 mm (standard: 10 mm to 12 mm).

: Dust-tight and immersion-proof		IP67

				 Intrinsically safe

Ex ia ⅡC T3/T4 (Temperature class of TIIS-certified models is T4,					that of NEPSI-certified models is T1 ... T6)

				 Flameproof

Ex db Ⅱ C T3 ... T6 (Temperature class of TIIS-certified models is T4)

Ambient temperature		: Dust-tight and immersion-proof		–20 to +70℃

				 Intrinsically safe		–20 to +60℃
				 Flameproof		–20 to +55℃ (TIIS-certified products)
					–20 to +60℃ (other certified products)

Insulation resistance		

: 20 MΩ or more/500 V DC (between the batch of power supply terminals and the case)Withstand voltage			: 500 V AC/1 min (between the batch of power supply terminals and the case)

TG-F2289-E02

TOKYO KEISO CO., LTD.

5

AM3000 Series

MICRO FLOWMETER●Dimensions of the indicator/transmitter

28.5 （36.5）

154

43

（9.3）

41.5

120

140

Internal tube type (Approx. mass: 1.3 kg)

46

219

140
（9.3）

41.5

120

External tube type (Approx. mass: 1.5 kg)（36.5） 28.5

154

（53）
（79）

219

154

43
88

34.5

120

Ø74

17

140

Ø133

Explosion-proof type (Approx. mass: 2.3 kg)（48.5）

237●Terminals and wiring
Internal and external tube types

Explosion-proof type

Bare wire:
0.2 to 2.5 mm２
Rod terminal:
0.25 to 2.5 mm２
Power

Load resistance

Power

Ａ

2-M4

Ａ

supplysupplyＥ

6Load resistanceTOKYO KEISO CO., LTD.

Ｅ

TG-F2289-E02

AM3000 Series MICRO FLOWMETERDIMENSIONS

120

L

140

●Internal tube type (screw connection)

Thread size

1/4

3/8

1/2

L（mm）

180

160

190

Approx. mass（kg） 1.6

1.5

1.7

Note: Screw sockets are provided for 1/4
and 1/2.
43

49

105

46

65

219

120

260

140

●Internal tube type (ﬂange connection)

Flange size (mm)

10

15

20

25

Approx. mass (kg)[JIS 10K]

2.6

2.7

3.0

3.8

Note: Thread size of the body: Rc 3/8

43

49

105

46

65

219

120

L

140

●External tube type (screw connection)

Thread size

1/4

3/8

1/2

L（mm）

180

160

190

Approx. mass（kg） 1.8

1.7

1.9

Note: Screw sockets are provided for 1/4
and 1/2.
（53）（79）

TG-F2289-E02

49

105

65

219

TOKYO KEISO CO., LTD.

7

AM3000 Series

MICRO FLOWMETER

120

140

260

●External tube type (ﬂange connection)

Flange size
(mm)

10

15

20

25

Approx. mass(kg) [JIS 10K]

2.8

2.9

3.2

4.0

Note: Thread size of the body: Rc 3/8

(53)

49

105

(79)

65

219

120

140

L

●Internal tube/large-ﬂow type (screw connection)

49

105

46

Thread size

3/8

1/2

3/4

L（mm）

230

265

245

Approx. mass（kg） 2.2

2.4

2.4

Note:		 A gas damper cannot be used withthis type. The AM7000 series isrecommended.
Note:		 Thread size of the upper side: Rc
3/8, bottom side: Rc 3/4

65

219

43
46

8

TOKYO KEISO CO., LTD.

120

140

330

●Internal tube/large-ﬂow type (ﬂange connection)

49

105

Flange size (mm)

15

20

25

Approx. mass (kg)[JIS 10K]

3.4

3.7

4.5

Note:		 A gas damper cannot be used withthis type. The AM7000 series isrecommended.
Note: Thread size of the upper side: Rc 3/8,
bottom side: Rc 3/4

65

219

TG-F2289-E02

AM3000 Series MICRO FLOWMETER

AM3□□□/□1/□E (FLAMEPROOF TYPE)
Models with an optional function of current transmission or current transmission+HART® communication satisfy flameproof specifications.
Please choose an appropriate class in each standard.
Ex type
TIIS
NEPSI

ATEX
KOSHA
IEC-ExClass
Ex dⅡC T4
Flameproof
Ex dbⅡC T3 ... T6 Gb
Dust explosion-proof
Ex tb Ⅲ C T85℃ Db
Flameproof
Ⅱ2G Ex dbⅡC T6 ... T3 Gb
Dust explosion-proof
Ⅱ2D Ex tb Ⅲ C T85℃ Db
Ex dⅡC T6 ... T3
Flameproof
Ex dbⅡC T6 ... T3 Gb
Dust explosion-proof
Ex tb Ⅲ C T85℃ Db

Fluid temperature− 20 to ＋ 135℃

Ambient temperature− 20 to ＋ 55℃

T3： up to ＋ 150℃
T4： up to ＋ 135℃
T5： up to ＋ 100℃
T6： up to ＋ 85℃− 20 to ＋ 60℃

Note: Use a cable gland as shown below for the TIIS flameproof type.
● Cable gland for the TIIS flameproof type (EXPC-16B by Shimada Electric Co.)
M20×1.5（Indicator side）

M20×1.5 or G1/2 or NPT1/2

Applicable cable diameter: 6 mm to 12 mm(Standard: 10 mm to 12 mm)

AM3□□□/□1/□I (INTRINSICALLY SAFE TYPE)
Models with an optional function of current transmission or current transmission+HART® communication satisfy intrinsically safe
specifications. Please choose an appropriate class in each standard.
Ex type

Class

TIIS

Ex iaⅡC T4

NEPSI

Ex iaⅡC T1 ... T6 Gb

ATEXIntrinsically safe
Ⅱ2G Ex iaⅡC T3/T4 Gb
Dust explosion-proof
Ⅱ2D Ex ia Ⅲ C T150℃ Db

KOSHA

IEC-ExEx iaⅡC T3/T4

Intrinsically safe
Ex iaⅡC T3/T4 Gb
Dust explosion-proof
Ex ia Ⅲ C T150℃ Db

Fluid temperature
Internal tube type : up to ＋ 150ºC
External tube type: up to ＋ 165ºC
Internal tube type (T3 ... T6): up to ＋ 150ºC
External tube type (T1 ... T6): up to ＋ 430ºC
Intrinsically safe
Internal tube type (T4): up to ＋ 150ºC
External tube type (T4): up to ＋ 165ºC(T3): up to ＋ 200ºC
Dust explosion-proof
Internal tube type : up to ＋ 150ºC
External tube type: up to ＋ 200ºC
Internal tube type (T4): up to ＋ 150ºC
External tube type (T4): up to ＋ 165ºC(T3): up to ＋ 200ºC
Intrinsically safe
Internal tube type (T4): up to ＋ 150ºC
External tube type (T4): up to ＋ 165ºC(T3): up to ＋ 200ºC
Dust explosion-proof
Internal tube type : up to ＋ 150ºC
External tube type: up to ＋ 200ºC

Ambient temperature− 20 to ＋ 60℃− 20 to ＋ 60℃
Intrinsically safe
− 20 to ＋ 60℃
Dust explosion-proof− 20 to ＋ 50℃− 20 to ＋ 60℃

Intrinsically safe
− 20 to ＋ 60℃
Dust explosion-proof− 20 to ＋ 50℃● Intrinsically safe specifications for an option of current transmission or current transmission+HART® communication
Max. voltage for intrinsically safe circuit
Max. current for intrinsically safe circuit
Max. power consumption for intrinsically safe circuit
Internal capacitanceInternal inductanceTG-F2289-E02

Rated value
28 V DC less than
93 mA less than
650 mW less than
5 nF or more
0.2mH or moreTOKYO KEISO CO., LTD.

9

AM3000 Series

MICRO FLOWMETERADDITIONAL SPECIFICATIONS
1. Gas damper (Model AM3000/DU)
A gas damper which requires no damper liquid is available for gas measurement. A mechanical damper consisting of a cylinder and apiston is connected to the float rod bearing.
This type needs no external damping mechanism at the bottom of the flowmeter, and the gas does not restrict flow, which allows flexible
piping designs.
Furthermore, there is no need for filling damper liquids, reducing the maintenance work. The gas damper is particularly useful for
low-pressure gas applications which may cause hunting of the float and which do not allow damping liquids. A gas damper is highly
recommended for applications with a pressure of less than 0.3 MPa and no needle valve at the downstream.
Note that this type of gas damper cannot be used for liquids or condensable vapors. Chlorine gas, which easily combines with otherchemicals, or gases containing rust, dust, oil and other materials, could cause the flowmeter to malfunction.

120

140

L

●Gas damper (AM3000/DU) (screw connection)

43

49

105

46

Thread size

1/4

3/8

1/2

L（mm）

220

200

230

Approx. mass
（kg）

1.7

1.6

1.8

Note: Screw sockets are provided for 		
1/4 and 1/2.
Note:		The gas damper cannot be used 		for high-temperature types.

65

219

43
46

10

TOKYO KEISO CO., LTD.

120

140

300

●Gas damper (AM3000/DU) (ﬂange connection)

49

105

Flange size
(mm)

10

15

20

25

Approx. mass(kg) [JIS 10K]

2.7

2.8

3.1

3.9

Note: Screw sockets are provided for 		
1/4 and 1/2.
Note: The gas damper cannot be used
for high-temperature types.
Note: Thread size of the body: Rc 3/8

65

219

TG-F2289-E02

AM3000 Series MICRO FLOWMETER
2. Liquid damper (Model AM3000/DL)
A damper mechanism is required for gas measurement especially in low-pressure applications to prevent hunting of the float.
The damper installed at the bottom of the flowmeter ensures the accuracy and durability of the flowmeter. The damping mechanism
reduces abrupt movements of the float by using the resistance generated between the oil in the damper and the damping element
connected to the float rod.
The liquid damper is also recommended for liquid applications with pulsating flows.

105
219

49

L (for 1/4 or 1/2)

（59）

L (for 3/8)140●Internal tube type (screw connection)

65

Thread size

1/4

3/8

1/2

L

210

190

215

A

40

45

45

Approx. mass
（kg）

2.5

2.5

2.7

（150）

Note: Use the cable entry on the backto avoid interference between thepiping and conduits.

A

105
219

65

Flange size (mm)

10

15

20

25

Approx. mass (kg)[JIS 10K size]

3.5

3.6

3.9

4.7

Note:		Use the cable entry on the back to
avoid interference between the piping
and conduits.

（150）

49

（59）

140

240

●Internal tube type (ﬂange connection)

190

TG-F2289-E02

TOKYO KEISO CO., LTD.

11

AM3000 Series

MICRO FLOWMETER

L (for 3/8)
（59）

140

105
219

65

Thread size

3/8

1/2

3/4

L

260

270

240

A

45

45

55

Approx. mass
（kg）

3.5

3.7

3.7

Note: Use the cable entry on the back 		to avoid interference between thepiping and conduits.

（150）

49

L (for 1/4 or 1/2)

●External tube/large-ﬂow type (screw connection)

A

140

290

●External tube/large-ﬂow type (ﬂange connection)

65

20

25

Approx. mass (kg)[JIS 10K]

4.6

4.9

5.7

（150）

105
219

15

Note: Use the cable entry on the back to
avoid interference between the piping
and conduits.

（59）

49

Flange size (mm)

190

12

TOKYO KEISO CO., LTD.

TG-F2289-E02

AM3000 Series MICRO FLOWMETER
3. Needle valve (Model AM3000/V □ )A needle valve is used to control flow rates. Install one downstream of the flowmeter to avoid hunting of the float in gas measurement.
Placing a valve on the upstream side may reduce pulsation in liquid measurement.
● Standard specification

Nominal size

: Rc3/8

Max. op. pressure : 3 MPa
Fluid temperature : –15 to +150℃
Material: SUS316●Needle valve (AM3000/VU) (screw connection)

43

49

105

46

Thread size

1/4

3/8

1/2

L（mm）

245

225

275

Approx. mass
（kg）

1.8

1.7

1.9

Note: Screw sockets provided for 1/4 		
and 1/2.
Note: The length“L”of the flowmeterwith a gas damper is 40 mm 		longer downstream.

120

140

L

（Max.66）

65

219●Needle valve (AM3000/VU) (ﬂange connection)

43
46

TG-F2289-E02

120

140

325

（Max.66）

49

105

Flange size
(mm)

10

15

20

25

Approx. mass(kg) [JIS 10K]

2.8

2.9

3.2

4.0

65

219

TOKYO KEISO CO., LTD.

13

AM3000 Series

MICRO FLOWMETER

4. Magnet strainer (Model AM3000/MG)
Iron particles in liquids may be attracted by the magnet in the float and cause the flowmeter to malfunction. To prevent this, install amagnet strainer at the inlet of the flowmeter. The 100 mesh strainer is available as standard (200 mesh is optional).
●Dimensions of the magnet strainer● Standard specification
Nominal size

: 1/4, 3/8, 1/2

Fluid pressure: Max. 1.5 MPa（75）

Fluid temperature : Max. 200℃
Filter

OUT: 100 mesh (standard)		 200 mesh (option): SUS304, SUS316
100

Material

S

NN

S

IN

5. Purge set
Combined with a constant flow valve, the AM3000 micro flowmeter keeps flow rates constant even when the primary or secondarypressure fluctuates. For details, see TECHNICAL GUIDANCE of the C series.
6. Panel mounting type (Model AM3000/PN)
The panel mounting type facilitates mounting onto other instruments.
The locations and dimensions of holes for fixing screws and the dimensions of the panel are shown below.
The fixing screws are to be provided by the customer. Select ones appropriate for the thickness of the panel.

Panel●Panel mounting (front view)
30±0.54-Ø4.54-M4

140

4-M4×6142160±0.54530±0.5●Panel mounting (side view)

160±0.5●Panel cut dimensions

43
32.5

Note: Metal fixtures should not be used for supporting the flowmeter.
Support the flowmeter with other tools so as not to apply any force to the piping tube and wiring connection.

14

TOKYO KEISO CO., LTD.

TG-F2289-E02

CAUTIONS● The flowmeter transmits the displacement caused by the magnet coupling. Any other nearby magnetic field might affect theperformance of the flowmeter.
Avoid installing the flowmeter in a magnetic field and do not bring magnetic materials close to it, including insulation covers which may
contain magnetic materials.
● When installing two or more flowmeters, install them at least 10 cm apart from each piping to avoid interference.
For maintenance, ensure a clearance of at least 20 cm between the indicator of one flowmeter and the body of other flowmeters.

STANDARD SCALE GRADUATION
10

8

12

15

20

10
15
8

20
15

6

2

30

20

10

6

4

25

4

10
10

5
5

10

5

1

2
1.2

1.5

2

2.5

3

0

0

0

0

0

0

40

50

60

70

80

90

30

40

50

80

60
60

60

40
30

20
10

40
30

20

10

20

4

5

10
6

0

0

0

20

40

20

40

20

7

8

9

0

0

0

* 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