BEST COST EFFECTIVE

TF-900 Series
MINI THERMAL MASS FLOWMETEROUTLINE
TF-900 MINI THERMAL MASS FLOWMETERS are developed in
the extreme priority for very competitive price. TF-900 has not been
influenced by the change in temperature and pressure, and candirectly measure mass flow rate of Air, Nitrogen and Oxygen.
Low price is realized by reconsidering design thoroughly with highperformance.
TF-900 MINI THERMAL MASS FLOWMETERS are designed anddeveloped to offer the remote indication and control of gas flow
process where glass tube Purgemeters have been commonly used.

FEATURES❏ Low cost, High performance❏ Light and compact design❏ High-speed response
0.5 sec. for 90 %❏ Easy maintenance
No by-pass tube used.
❏ Supporting instruments are ready

OPERATION PRINCIPLE
Temperature detection sensor Ra and velocity detection sensor Rw
are installed in the gas flow path of TF-900 MINI THERMAL MASSFLOWMETER. The internal electronics circuits keep the temperature gap between Rw (Tw) and Ra (Ta = Gas temp.) constant by
supplying electric current I. The transferred heat from Ra to passedgas (Rw , I) is proportional to the mass flow rate of the gas to bemeasured which can be calculated from supplied current I. The
detection principle is completely free from the change of gas pressure and the change of temperature. It is compensated by internal
software and finally the measurement is totally independent of any

STANDARD SPECIFICATIONMODELFLUID

TF-900S/TF-901S TF-900P/TF-901P
Air, N2, O2
Min. 0 to 10 L/min (nor)
SCALE RANGE
Max. 0 to 100 L/min (nor)
OUTPUT
0 to 5 V DC
ACCURACY±3 %F.S. (at 25°C)
RANGE ABILITY
1 : 20GAS TEMP
0 to 60°C
0 to 50°C
GAS PRESS-0.07 to 1.0 MPa-0.07 to 0.5 MPa
TEMP CHANGE EFFECTWithin ±0.1 % F.S./°C
BODY
SCS14
POLYACETALSUS316, PFA, CTFE, GLASS, PT,MATERIALSENSORPOLYAMIDE, Ni
SEAL
FKM
HOUSINGABS resin (In-door use)
PROCESS CONNECTION
Rc1/4±12 V DC or ±15 V DC, +150 mA,
TF-900POWER-20 mA
SUPPLY
TF-901
24 V DC (22 to 27 V DC), 150 mA
ELECTRIC CONNECTION
Exclusive cable with connector

operating conditions.
The flow rate is calculated from the supplied current I and output inthe form of 0 to 5 V DC signal.

MODEL CODE
MODEL CODEDESCRIPTION□ □ — □□□ — □ □□0±12 V DC or ±15 V DC
124 V DC (22 to 27 V DC)
SSCS14MATERIALPPOLYACETAL
1000 to 10 L/min (nor)200
0 to 20 L/min (nor)300
0 to 30 L/min (nor)
SCALE RANGE
500
0 to 50 L/min (nor)800
0 to 80 L/min (nor)101
0 to 100 L/min (nor)
CONNECTION RATINGP
Rc (female screw)
CONNECTION SIZE
04 1/4"
TF-90
POWER
SUPPLYTG-F2453-E00
1st edition Jan 2024 K

TF-900 MINI THERMAL MASS FLOWMETERDIMENSIONPRESSURE DROP

23°C N2 ATM [INNER DIAMETER OF CONNECTION:φ7.0]

2.5100 L/min(nor)PRESSURE DROP [kPa]

2.080 L/min(nor)1.5

1.050 L/min(nor)30 L/min(nor)
20 L/min(nor)

0.5

10NL/min(nor)00204060

80100

FLOW RATE [%]APPLICATIONS● With TM3000series converter unit

● With standard power supply unit

All necessary functions, i.e. power supply, indication, totalization, alarm contacts, etc. are provided in one TM3000 series miniconverter unit.

±12 V DC or±15 V DC

0 to 5 V DC
OutputConnection with mass flowmeter

Analog output

SC-MM3 cable

Scaled pulse output

100 V AC

Alarm output
AC power supply

24 V DC

TF-9000 to 5 V DCOutput

TM3000100 V AC

EXCLUSIVE CABLES
Cable CodeSC-MM3SC-MC
SC-MPTo connect power supply
TM3000 Mini converter unit
±12 V DC or ±15 V DC
24 V DC (22 to 27 V DC)

Standard length
2m2m2mMax length
100 m
100 m
100 m

* 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
2TG-F2453-E00