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Battery Powered Indicating Flow Meter For Rate or Total Flow

Digital Paddlewheel Meters


Article# FP2108-T

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Digital Paddlewheel Meters FP2108-T FP2108-T

Discontinued, identical replacement TB-100FI-GPM1.

  • High Accuracy Digital Paddlewheel Technology
  • Pipe Sizes from 3/8 to 2"
  • Tamper Proof Factory Programming
  • Easy to Read 6-Digit LCD Display, Up to 4 Decimal Places
  • Battery Operated (2 "AAA" Batteries Included)
  • Very Low Pressure Drop
  • Total Reset Function Can be Disabled

FP2108-T Options de modèles

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*Les options en surbrillance ne sont pas compatibles. Veuillez sélectionner une combinaison différente.

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

The FP2000 Series is designed to measure the flow of a fluid in a pipe. The meter is factory calibrated to any engineering units and displays the rate of flow, total or both (depending on the model selected) on a 6-digit LCD display. Two “AAA” batteries power the unit for up to one year. There are three models available: FP2000-R is a rate meter designed to measure and display the rate of flow; FP2000-T is a totalizer meter designed to measure and display the total flow; FP2000-RT is a rate/totalizer meter designed to measure and display both the rate of flow and the total flow.

Measuring accuracy requires a fully developed turbulent flow profile. Pulsating, swirling and other disruptions in the flow stream will affect accuracy. Flow conditions with a Reynolds Number greater than 4000 will result in a fully developed turbulent flow. A Reynolds Number less than 2000 is laminar flow and may result in inaccurate readings.

Reynolds Number Equation:
Reynolds Number=(3160 x Q x G)/(D x V)
   Q = Flow rate of the fluid in GPM
   G = Specific gravity of the fluid
   D = Pipe inside diameter in inches
   V = Fluid viscocity in centepoise

Minimum Straight Pipe Length Requirements
The meter’s accuracy is affected by disturbances such as pumps, elbows, tees, valves, etc., in the flow stream. Install the meter in a straight run of pipe as far as possible from any disturbances. The distance required for accuracy will depend on the type of disturbance.
Disturbance Type Min
Inlet Pipe Length
Outlet Pipe Length
Flange 10x pipe ID 5x pipe ID
Reducer 15x pipe ID 5x pipe ID
90° Elbow 20x pipe ID 5x pipe ID
Two Elbows-1 Direction 25x pipe ID 5x pipe ID
Two Elbows-2 Directions 40x pipe ID 5x pipe ID
Pump or Gate Valves 50x pipe ID 5x pipe ID

Max Working Pressure: 20 bar (300 psi) at 21°C (70°F)
Max Fluid Temperature: 93°C (200°F) at 0 psi
Max Ambient Temperature: -10 to 43°C (14 to 110°F)
Full Scale Accuracy: ±2%
Power Requirement: 2 "AAA" batteries (included)
Enclosure: NEMA 4X (IP56)
Maximum Pressure Drop: 0.6 BAR (8 psi) (varies per model)
Approximate Shipping Wt: 0.91 kg (2 lb)
Materials of Construction
   Pipe Fitting: Polypropylene (FP2000 series) or PVDF (FP2100 series)
   Sensor, Paddlewheel, Axle: PVDF
   Sensor O-ring seals: FKM
   Enclosure: ABS
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Rated 4 out of 5 by from Excellent stand alone flow-meter I have used several of these units to monitor seawater flow in experiments we conduct in a marine laboratory. I have been very pleased with their operation. I especially like that they are battery powered. There is only one issue that I have had, the plastic rod that holds the propeller has broken on several of these units and I can not get replacement parts. I fortunately was able to replace it with a stainless steel tubing, which is much more durable. This would not work if the media being monitored was acidic or basic.
Date published: 2017-08-01
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Is the Item# RB-100FI-GPM2 can display LPM instead of GPM?

Asked by: DanS2022
Thank you for your inquiry about the flow meter. Yes, it has different engineering units for volumetric including LPM to display.
Answered by: Application Engineer JC
Date published: 2022-06-02

Could you please confirm if this Item# FP2014-RT comes in BSP Thread & Litres per minute for Australian use?

Asked by: TonyOZZI
Thanks for your questions. No, the FP2014-RT comes with MNPT connections. Regarding flow rate units, it can display LPM US liters.
Answered by: ASE HPO
Date published: 2019-10-15

What is the maximum flow rate of Item# FP2005-R?

Asked by: Donco
The maximum flow rate for the FP2005-R meter is 8 GPM.
Answered by: Application Engineer JC
Date published: 2019-08-10

Is this rated for electrically classified hazardous locations?

Asked by: DougG
Thank you for your inquiry about the paddle wheel sensor. Unfortunately, it is not rated for hazardous applications.
Answered by: Application Engineer JC
Date published: 2022-11-03

What is the maximum flow rate of the FP2001-R?

Asked by: PeteFPE
Thanks for connecting with Omega Engineering. As per your question, 4 gallons/minute is the maximum flow rate. Please email us at if you have any further questions. Thanks!
Answered by: Jane
Date published: 2019-05-22
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Replacement battery for RH-1X
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