Ultrasonic Flowmeter for Air (FWD)

Ideal for compressor control
Applicable pipe diameter: 25–200 mm

No pressure loss = no energy loss
Tolerant to oil and mist – No need for filter such as mist separator
Lithium-ion battery driven version available
Battery life: approx. 10 years
Flow rate conversion
Actual flow rates are converted into those in normal or standard conditions.
Forward/reverse flow measurement
Air leakage detection

Literature & Manuals

Specifications

Pipe diameter (mm)

25, 32, 40, 50, 65, 80, 100, 150, 200

Power supply voltage

24 V DC ±10% or lithium-ion battery (battery life: approx. 10 years under the temperature of 20°C)

Power consumption

24 V DC, 1.5 W or less

Target fluid

Air (mainly factory air) or N₂ (pipe diameter 25–80 mm)

Fluid temperature

-10°C to 60°C, RH90% or less

Operating pressure

< 1 MPa (gauge pressure)

Range (actual flow rate) and accuracy

Diameter (mm)	Range (m³/h)	Accuracy
Diameter (mm)	Range (m³/h)	±2.0% of rate	±5.0% of rate
25	±0.6–35	±3.5–35 m³/h	±0.6–3.5 m³/h
32	±1.1–65	±6.5–65 m³/h	±1.1–6.5 m³/h
40	±1.3–80	±8–80 m³/h	±1.3–8 m³/h
50	±2.5–150	±15–150 m³/h	±2.5–15 m³/h
65	±4–240	±24–240 m³/h	±4–24 m³/h
80	±5–300	±30–300 m³/h	±5–30 m³/h
100	±10–500	±50–500 m³/h	±10–50 m³/h
150	±24–1200	±120–1200 m³/h	±24–120 m³/h
200	±40–2000	±200–2000 m³/h	±40–200 m³/h

Flow rate conversion accuracy:

FWD025–080: ±2.5% or rate (at 500 kPa, 25°C, dry air)
FWD100–200: ±2.0% or rate (at ≥ 300 kPa)

Display

Main display

Forward or forward/reverse mode:

⌀25–⌀80 mm: Instantaneous flow rate (m³/h) 5-digit (4-digit for over 2000), Pressure (kPa) 5-digit, temperature (°C) 3-digit
⌀100–⌀200 mm: Instantaneous flow rate (m³/h) 5-digit (4-digit for over 2000), Pressure (kPa) 5-digit, Temperature (°C) 3-digit

Sub display

⌀25–⌀80 mm: Instantaneous flow rate (Nm³/h) 5-digit (4-digit for over 2000), Pressure (kPa) 5-digit, temperature (°C) 3-digit
⌀100–⌀200 mm: Instantaneous flow rate (Nm³/h) 5-digit (4-digit for over 2000), Pressure (kPa) 4-digit, Temperature (°C) 3-digit

Output signal
(not available for battery-driven version)

Current output

4–20 mA DC (±0.5% FS), maximum resistance load 400Ω, maximum output current 22 mA
Instantaneous flow rate, pressure, or temperature

Contact output

2 open drain outputs, maximum load 24 V DC, 50 mA, maximum frequency: 10 Hz, Duty 35–65%
Output 1: Unit pulse (forward), Output 2 : Unit pulse (reverse), Upper/lower alarm, device error

Connection method

⌀25, ⌀32 mm

⌀25 mm: Rc1, ⌀32 mm: Rc1-1/4

⌀40–⌀80 mm

Wafer (between JIS10K flanges)

⌀100–⌀200 mm

JIS10K flange

Pipe condition
(straight pipe length)

⌀25, ⌀32 mm

Upper stream 20D or more, downstream 5D or more
When using with forward/reverse display mode, both of upper/lower stream 20D or more

⌀40–⌀200 mm

Upper stream 10D or more, downstream 5D or more
When using with forward/reverse display mode, both of upper/lower stream 10D or more

Materials of gas-contacting parts

Aluminum alloy, PPS, fluorosilicone rubber, etc.

Installation location

Indoor or outdoor (IP64 equivalent)

Storage temperature

-20°C to 70°C, non condensing