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Low Flow Indicating Paddlewheel Flow Meter
Micro-flow meter
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- NEMA 4X (IP56) Enclosure
- 6-Digit LCD
- Displays both Rate and Total
- Non-Volatile Programming and Total
FTB311 Model Options
View all modelsEdit these specs to order a different model. Not all combinations are valid. Options compatible with previous selections will be in bold.
*Highlighted options are not compatible. Please select a different combination.
Flow Range
Output Signal
Supply Power
Process Connection Size
Display
Category
Accuracy
Max Process Temperature
Max Operating Pressure
Wetted Materials
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).
SPECIFICATIONS
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')
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).
SPECIFICATIONS
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 |
Rated 5 out of
5
by
Engineer from
Great little flow meter
We purchased this flow meter for a test project and we really loved the ease of use and accuracy. Would definitely recommend this product to others.
Date published: 2015-11-24
Rated 5 out of
5
by
Thermal Gremlin from
Right Tool for the Job.
Bought this, received fast, fairly priced, and the perfect tool for my needs.
Date published: 2016-04-29
Rated 1 out of
5
by
Josh2 from
Fittings don't fit
The fittings that came with the flow meter did not actually fit. And they only sent one. We have been in contact with Omega for several weeks now trying to fix the issue and it has not been resolved.
Date published: 2021-03-11
Rated 4 out of
5
by
Korn from
Great product
Good and precise flow meter, in addition, should have a hard reset switch, in case of the error
Date published: 2016-10-10
Rated 5 out of
5
by
Eric Grell from
Great product and easy to order
Ordering was very easy and I received confirmation of the order quickly
Date published: 2023-05-03
What are the dimensions of the FTB311 Micro-Meter
Thank you for your question.
A file has been sent to your email with dimensions for this part..
Date published: 2019-07-01
Are there replacement grey fittings available for purchase? (The grey circular fittings on either side of the flow meter)
Thank you for your inquiry! Unfortunately, we do not offer the inlet and outlet fittings as a separate accessory for these flow meters
Date published: 2022-09-29
The flowmeter stopped working after 4 months installed in a pressure manifold. The sensor had continuous power during the time, the failure was found on the infrared sensor once the flowmeter was replaced. What is the life expectancy of the sensor?
Thanks for your question. The life expectancy of the flow meter depends on the each individual application. Customers have this flow meter after 3 years and still working while others fail after 4 months. Send us an email or call us with more details of your application.
Date published: 2019-11-09
Is there an wiring schematic for the flow meter itself, instead of just the strainer that's in the manual? I'd like to output the signal to another unit if that's possible.
We can send a copy of the wire schematic for this flow meter, please send that request to flow@omega.com which would be much appreciated.
Thank you.
Date published: 2019-11-16
Is there any damage to the unit if exposed to flow rates higher than its flow reading capability?
Thank you for your inquiry! Exceeding the specified flow range can damage internal components by overspinning the paddle. In general slightly exceeding the maximum on occasions will not be an issue. Regularly exceeding the maximum flow rate by more than 10% may lead to excessive wear and deterioration of the meter.
Date published: 2022-09-02
I have three FTB300, one of them return me a 4Vdc from the sensor when there's no flow and I actually have a feedback on my PLC when there's flow.The two other 0V when there's no flow, and around 2V when there's a flow, and I don't have any feedback
Thank you for your inquiry about the sensor. Please forward your statement to further assist trouble shooting the flow meter to the Flow Group at flow@omega.com
Date published: 2023-06-21
Is it applicable for air flow?
Thank you for your inquiry! Unfortunately, these units will not work properly with air flow. They will only work with clean liquids
Date published: 2022-01-26
Do you have a larger unit that can measure ~ 1-10 gal/min?
Thank you for your inquiry about a flow meter. Please compose an email and send to flow@omega.com and can provide options that best fits your application.
Date published: 2020-07-25
