Instrumentation
Spool Piece Ultrasonic Flowmeter <FST>

( 1:25 )

Ex-proof version

Three pairs of sensors for accuracy of ±0.2% of rate

High accuracy
±0.2% of rate
Using the new algorithm for calculating the flow velocity, it can measure any type of fluid with high accuracy.
Low maintenance
With no moving parts, FST has long-term stability while requiring only minimal maintenance work.
Bubble resistant
By using the advanced anti-bubble measurement technology, the interference from air bubbles is greatly eliminated.
Wide temperature range from -40°C to +150°C
Non conductive fluid including oil, mixed liquid, purified water can be measured.
Easy-to-operate
with backlit LCD and front panel operation
IECEx, ATEX, NEPSI, and Japanese ex-proof certification

Principle

Transit time difference method with the advanced ABM (anti-bubble measurement) system

Pipe diameter (mm)

50, 80, 100 mm

Flow velocity range

Minimum 0 to 0.3 m/s or -0.3 to 0 m/s
Maximum 0 to 10 m/s or -10 to 0 m/s

Flow range

Power supply

100–240 V AC (+10% -15%), 50/60 Hz or 20–30 V DC

Power consumption

Approx. 20 VA (AC power), Approx. 6W (DC power)

Varistor

Attached to the power supply terminal

Surge arrester

Attached to the analog output terminal

Enclosure

Standard version: IP66
Ex-proof version: IP67

Ambient temperature

Standard version: -40°C to +60°C
Ex-proof version: -10°C to +60°C

Ambient humidity

≤ RH 90%

Ex-proof certification

IECEx, ATEX, NEPSI, Japanese ex-proof standard

Fluid	Liquid (uniform liquid through which ultrasonic wave can propagate)
Bubble content	≤ 12 vol%
Turbidity	≤ 10,000 mg/L
Fluid condition	fully-developed turbulent or laminar flow in a fully-filled pipe
Fluid temperature	Standard version: -40°C to +150°C Ex-proof version: -10°C to +150°C
Pressure	Up to flange rating
Kinematic viscosity	≤ 100 mm²/s

Wetted parts material	Flow cell: stainless steel 316L Flange: stainless steel 316L Sensor wetted parts: stainless steel 316L
Housing	SCS13
Process connections	Flange (horizontal or vertical mounting)
Flange rating	JIS10K/JIS20K ANSI 150/300 DIN PN16/40

Accuracy	±0.2% of rate (flow velocity: 1 m/s to 10 m/s) ±0.002 m/s (flow velocity: 0.5 m/s to 1 m/s) 4–20 mA DC output: above indicated accuracy ±0.01 mA
Response time	1.2 s (standard)

Analog output signal	4–20 mA DC (insulated), 1 point, allowable load resistance: 600Ω or less
Contact output	Forward total, reverse total, alarm, acting range, flow switch, or total switch ‧ Type: transistor output (isolated, open collector) ‧ Contact capacity: 30 V DC, 50 mA ‧ 2 points ‧ Normally ON or normally OFF, selectable ‧ Frequency: maximum 100 P/s (Pulse width: 5, 10, 50, 100, 200, 500, 1000 ms)
Communication (option)	RS-485 (MODBUS), isolated, arrestor incorporated No. of connectable modules: up to 31 HART (option for ex-proof version)
Display	16-digit 2-line backlit LCD 2-color LED (green: normal, red: at error)
Language	Japanese (katakana), English, French, German, Spanish (switchable)
Flow velocity/flow rate indication	8 digits numerals (decimal point is counted as 1 digit) Instantaneous flow rate, instantaneous flow velocity (minus indication for reverse flow)
Total value indication	Integrated value of forward flow or reverse flow (reverse flow is indicated with minus symbol) 8 digits numerals (decimal point is counted as 1 digit)
Housing material	Aluminum alloy
Coating/finish color	Urethane resin/silver
Cable entry	Standard version: G1/2 internal thread, with plastic watertight cable glands and rubber plugs Ex-proof version: M20 × 1.5 internal thread, with a) blind plugs or b) cable glands with pressure-proof packings
Terminals	Euro-style terminals

Zero point adjustment	By setting zero or clearing zero
Damping	For analog output or velocity/flow rate indication, 0 to 100 seconds
Low flow cut-off	0 to 5 m/s in terms of flow velocity
Alarm	For hardware error or process error
Output burnout (analog output)	Hold, overscale, underscale, or zero
Output limit	High/low limit for analog output is available in the range from 0.8 mA to 23.2 mA
Bi-directional range	Forward and reverse ranges configurable independently. Hysteresis: between 0% and 20% of working range Contact output available
Auto-switchable two ranges	User configurable Hysteresis: between 0% and 20% of working range Contact output available
Flow switch	Contact output available at user-defined H/L limit
Total switch	High limit for total flow Contact output can be activated when the total flow has exceeded the high limit.
Total preset	Total flow returns to the user-defined preset value every time a user resets the total.
Data backup at power outage	On nonvolatile memory