Spool Piece Ultrasonic Flowmeter <FST>

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

General specifications

Principle Transit time difference method with the advanced ABM (anti-bubble measurement) system
Pipe diameter (mm) 25, 50, 80, 100 mm
25 mm version is under development.
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
  Minimum Maximum
25 mm 0 to 0.54 m3/h 0 to 17.6 m3/h
50 mm 0 to 2.13 m3/h 0 to 70.6 m3/h
80 mm 0 to 4.65 m3/h 0 to 154.8 m3/h
100 mm 0 to 7.99 m3/h 0 to 266.0 m3/h
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 conditions

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

Detector

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

Performance

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)

Flow transmitter

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

Functions

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

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