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Low Flow Indicating Paddlewheel Flow Meter

Micro-flow meter


Item# FTB325D

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-4 $411.11
5-9 $390.55
10-24 $382.33
25-49 $365.89
50-99 $357.67
100+ $349.44

In stock

Lead Time (If not in stock): 3 weeks
Micro-flow meter FTB325D FTB325D
  • NEMA 4X (IP56) Enclosure
  • 6-Digit LCD
  • Displays both Rate and Total
  • Non-Volatile Programming and Total
  • For Clean Liquids

FTB325D Model Options

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*Highlighted options are not compatible. Please select a different combination.

Flow Range
Max Process Temperature
Max Operating Pressure
Wetted Materials
Output Signal
Supply Power
Process Connection Size
Process Connection Type

The FTB300 Series of digital paddle wheels are an economical choice for low flow rate applications. They use Infra-red light beam technology. Available connections include 1/8 FNPT, 1/4 FNPT and 3/8" OD tube fittings. Six available flow ranges as low as 30ml/min to 7000 ml/min. No display models have a 5 Vdc current sinking pulse output. Units with displays have a 6-digit LCD, with up to 4 decimal positions that display both flow rate and total. All units include an open collector alarm output.

User selectable scale factors include: flow units, gallons, liters, ounces, and milliliters. Time units include: minutes, hours, days. Users can also program custom units. Programming values and total are stored in the non-volitile memory. The total reset function can also be disabled. Standard units have a clear PVC viewing lens, PVDF chemical resistant lens are available as an option. The enclosure is a weather resistant Valox PBT and rated NEMA 4X (IP56).

Max Working Pressure:
    PVC Lens: 9 bar (130 psig) at 21°C (70°F)
    PVDF Lens ("-PVDF" Option): 150 psig (10 bar) @ 21°C (70°F)
Max Fluid Temperature:
    PVC Lens, FNPT Connectors: 54°C (130°F) at 0 PSI
    PVDF Lens ("-PVDF" Option), Tubing Connectors: 93°C (200°F) at 0 PSI
Full Scale Accuracy: ±6%
Input Power Requirement: 9 to 28 Vdc
Sensor Type: Infrared light beam
Alarm Output: Open collector 30 Vdc max
Enclosure: NEMA 4X (IP56)
Approximate Shipping Wt: 0.45 kg (1 lb) Materials of Construction
Body, Paddle, Axle Material: PVDF Connector Material
FNPT Connections: PVC
Tubing Connectors: PVDF Viewing Lens Material Option
    Clear See Through: PVC
    Opaque Chemical Resistant: PVDF (optional)
O-Ring Seals: FKM (EPDM optional)
Compression Seal to Pump: PVC Sensor Only
    Models: 5 Vdc digital square wave (2-wire)
    Output: 3-wire shielded cable, 1.8 m (6')

Model with Display Model without Display Range
1/8 FNPT 1/4 FNPT 3/8" OD Tube 1/8 FNPT 1/4 FNPT 3/8" OD Tube lpm gph
FTB311D FTB321D FTB331D FTB311 FTB321 FTB331 0.03 to 0.3 0.48 to 4.7
FTB312D FTB322D FTB332D FTB312 FTB322 FTB332 0.1 to 1 1.6 to 15.8
FTB313D FTB323D FTB333D FTB313 FTB323 FTB333 0.2 to 2 3.2 to 31.7
FTB314D FTB324D FTB334D FTB314 FTB324 FTB334 0.3 to 3 4.8 to 48
FTB315D FTB325D FTB335D FTB315 FTB325 FTB335 0.5 to 5 7.9 to 79
FTB316D FTB326D FTB336D FTB316 FTB326 FTB336 0.7 to 7 11.1 to 111
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