INDICATION AND OUTPUT OF FLOW RATE, TOTALIZATION AND ALARM,MIDDLE TO LARGE CONNECTION AND HIGH FLOW RATE MEASUREMENT VERSION

TF-2261T ALL-IN-ONEMINI THERMAL MASS FLOWMETER■ OUTLINEThe TF-2261T can handle larger flows than flowmeters with medium
to large connection sizes among the TF-2000 series mini thermal
mass flowmeters.
TF-2261T has LCD indication of flow rate and totalization. Also,
functions of scaled output pulse and DC4 to 20mA are provided.
Furthermore, two-point field adjustable alarm contacts are provided.
TF-2261T can be operated by DC24V power supply.

■ FEATURES❏ Wide range of process connection for high flow rate
Connections of 25mm to 80mm are available. They are usefulwith the extensive use in Air and Nitrogen supply lines etc.
❏ Simultaneous indication of flow rate and totalization■ FULL SCALE AND PRESSURE LOSS

Large two-line LCD is provided.

Meter size

❏ Output of current, pulse and alarm functions are provided.

25mm（1"）

Remote indication, batch processing and safety operations areachieved by one unit.

32mm（1-1/4"）❏ Mass flow measurement
40mm（1-1/2"）

Flow measurement is not influenced by the change in pressure
and temperature.

50mm（2"）❏ Excellent in durability
Excellently durable sensor supported by old know-how is used.

65mm（2-1/2"）❏ Whole quantity passage detection system
Pressure loss is very small.
❏ High speed responseHigh pressure response - 90% within one second❏ Selection up to six scale ranges can be made.

80mm（3"）✽Full scale m3/h (nor) Pressure loss (kPa) (✽)
Min.
80
32
Max.
160
Min.
150
39
Max.
300
Min.
200
38
Max.
400
Min.
300
32
Max.
600
Min.
500
33Max.
1000
Min.
70035Max.
1500

Pressure loss (at 1atm, 25°C) at the time of maximum full scale; The rough valueof the pressure loss is proportional to the square of flow rate and is in inverse
proportion to the pressure.

Up to 6 scale ranges can be preset using keys.

■ STANDARD SPECIFICATION
Fluid
Scale range
Rangeability
Gas press.
Gas temp.
Temp. change effectPress. change effectResponse

Material

FinishConstruction
Installation
Ambient temp.
Cable connection
Power supply
Consumption
Process connection

Air, Nitrogen
Min. 0 to 80m3/h (nor) / 25mm (1")
Max. 0 to 1500m3/h (nor) / 80mm (3")
1 : 20 (std.)– 0.07 to 1.0MPa
0 to 50°C
Within Span: ±0.1%F.S./°C
Within ±0.1%F.S./0.1MPa
1 sec. for 90%
Tube: SUS304 or SUS316
Sensor: Combination of SUS316, Glass, CTFE,and PT
Seal: FKM
Housing: AC2A
Housing: Munsell N8.5
Stainless body not painted
Waterproof (Equiv. to IP65)
Horizontal or Vertical (✽)
0 to 50°C
2 × G1/2 (Terminal: M3 screw)
DC24V (DC22V to DC27V)
Approx. 5.5W
Screw: Rc (1" to 2")
Flange: JIS10K (25 to 80mm)

Installation & flow directions: Horizontal and Left to Right (standard)
set up at factory

Indication

Flow rate : 4 digits LCD Height: 13mm
Totalization: 7 digits LCD Height: 6mm

Accuracy

Flow rate : ±2%F.S. ±1dig.
Totalization: ±2.1%F.S.
Totalizing count: 60 to 18000c/h

Low cut-off

Std. 5%F.S. (Adjustable)
Flow rate, Totalization, Current output, & Pulse output
Current output

OutputData backup: Accuracy ±2%F.S.
DC4 to 20mA
(Load resistance: 450 ohms or less)Pulse output
Output: Open collector
Rating: DC30V 30mA Max.
Pulse width: (Approx.) 100ms fixed
Pulse rate
: Synchronized with pulse count
Flow rate alarm output
Output: Open collector
Action: “ON” when operating(With Red LED for operating confirmation)
Rating: DC30V 30mA Max.
Setting: Push key at front panel
No. of points: 2 points (H + L alarm)
Setting accuracy : ±1.0%F.S.
Setting range: 0 to 100% of F.S.
Hysteresis: 1% ±0.5%F.S.
Setting of parameter and totalizing value is memorized
by EEPROM. (Retaining: For 10 years)

TG-F1154-E00
1st edition Mar 2018 K

TF-2261T
MINI THERMAL MASS FLOWMETER■ FRONT PANEL■ TERMINALPULSE OUT(E)
MINI-THERMAL TF-2000T

7 High alarm (HA)

MASS FLOW METER

L/hm3/h
L/min
Lm3

LA
COUNTS

LA
(E)

HA

(C)

(E)

(C)

1 2 3 4 5 6

1 Indicator
Upper line: Flow rate
Bottom line: Totalizing
2 Unit

UNIT:(nor)

HA

(C)

(–)

(+)

(+)

(–)

(+)

(–)

2-G1/2

Totalizing pulse output

MODE

8 Low alarm (LA)Low alarmTOKYO KEISO CO.,LTD.
JAPAN

123456(E)

(C)

(E)

(C)

(E)

(C)

PULSE OUTLAHARESET ANALOG OUT POWER

Open collector(Rating: DC30V, 30mA max.)

(+)
0 24V
9 10 11 12(–)

73456MODE

8UP
DOWN
SHIFTMODE

High alarm

Flow rate alarm output

RESET ANALOG OUT POWER(–)

M3 screw

(+)

024V

7 8 9 10 11 12✽ Use the MODE key for gas setting.
DC4 to 20mA Power supply
output DC24V■ DIMENSIONS

External switch

TF-2261T-＊＊＊-P＊＊■ MODEL CODEMINI-THERMAL TF-2000T

Model code
T —TF-2261
Full scale ﬂow rate ＊ A B C —MASS FLOW METERUNIT:(nor)L/hm3/h
L/min

HAL
m3LA
COUNTSHTOKYO KEISO CO.,LTD.
JAPAN——4

φD2-RcFLOW

L

TF-2261T-＊＊＊-F＊＊
MINI-THERMAL TF-2000T

MASS FLOW METERUNIT:(nor)L/hm3/h
L/min

HAL
m3LA
COUNTS

H

MODE

TOKYO KEISO CO.,LTD.
JAPAN

Description

Scale range
SUS304 (Available only forflange connection)
Materials
SUS316 (Available for all6—models)
P—Rc screw (1" to 2")Connection rating
JIS 10K Flange
F—(25 to 80 mm)
25—
25 mm (1")
Connection size
32 —32 mm (1-1/4")＊: Full scale ﬂow rate ＝
40 —40 mm (1-1/2")（AB）×10C m3/h（nor）（Ex.） 80 m3/h（nor）→ 800
50 —50 mm (2")
400 m3/h（nor）→ 401
65 —65 mm (2-1/2")
31500 m /h（nor）→ 152
80 —80 mm (3")
— R Left to Right (std.)— L Right to Left
Flow direction— U Bottom to Top— D Top to Bottom

MODE—φD■ CAUTION FOR INSTALLATION❏ Straight run upstream and downstream (d: inside diameter)
FLOWL
Note: The outer shapes of body for TF-2261T-✽✽✽-P25 andTF-2261T-✽✽✽-F25 differ slightly from the above ones.

UpstreamDownstream10d

5d

Installation of the pipe is the same connection as flowmeter.
❏ Rc screw connection is to be used for the pipe less than Sch. 80.
❏ Pipe which is different from connection of flowmeter is ±1 size.

■ DIMENSION TABLE

Install the necessary straight run of the same connection as theflowmeter.

D (mm)

Mass (Approx.) kg❏ Install valves downstream if any.

FlangeScrew❏ Before installing the flowmeter onto process piping, flush and

5.0

3.3

175

5.5

3.2

65

177

5.7

3.3

75

183

6.8

4.0

77

—

191

9.4

—

89—

198

10.4

—

Meter sizeL(mm)FlangeScrewH(mm)25mm

1953450

16632mm215

436040mm

2304950mm

2706165mm

290

80mm

320

clean the whole piping.
❏ Use the shielded cable for wiring and do not locate it near topower supply line etc. to avoid the electric noise.
❏ There is the arrow mark showing the flow direction. Make theinstallation so that the measured gas can flow as per the arrowmarking.
* 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 : http://www.tokyokeiso.co.jp
2TOKYO KEISO CO., LTD.

TG-F1154-E00