The Dwyer LFMA-01-A2 is a Series LFM polycarbonate variable area flowmeter that measures water flow from 0.1 to 1 GPM (0.5 to 4 LPM) on a 3 in. (76 mm) dual-scale, direct-reading body with 1/2 in. in-line male NPT connections.
The LFMA-01-A2 pairs an injection molded polycarbonate body with a 316 SS rod and float, an ABS float stop and standard 1/2 in. male NPT fittings in ABS, weighing 2 oz (56.7 g). Series LFM flowmeters are for indoor use only or areas without direct sunlight, because polycarbonate is adversely affected by ultraviolet light.
Specifications sourced from the Dwyer Series LFM catalog page (LFM_1, p. 253) and the Series LFM instruction manual, Bulletin V-31 (FR# R4-443531-00 Rev. 1). Last verified October 14, 2026.
Best For
- Direct reading of water flow from 0.1 to 1 GPM (0.5 to 4 LPM)
- Chill water flow monitoring
- Reverse osmosis systems
- Deionized water systems
- Indoor installations away from direct sunlight
Warranty
DwyerOmega limited warranty: free from defects in material and workmanship under normal use for one year from delivery to the buyer, or such other period as specified in a product-specific warranty supplied with the product.
Key Features
Dual GPM and LPM Scale
The 3 in. (76 mm) scale reads 0.1 to 1 GPM and 0.5 to 4 LPM directly, with a textured background behind the scale for easier reading.
Polycarbonate Body, 316 SS Float
Heat and chemically resistant injection molded polycarbonate body with a 316 SS rod and float, fluoroelastomer O-rings and an ABS flange nut.
Male NPT In-Line Connections
Standard 1/2 in. male NPT connections on both ends install directly in-line. Optional A-560 20 mm metric union fittings are available.
Removable Body for Cleaning
The body removes quickly with all fittings left intact. Clean with mild soap and a bottle brush; no other routine maintenance is required.
NIST Calibration Certificate Option
Order code NISTCAL-FL2 adds an NIST traceable calibration certificate for variable water flowmeters.
ZOT Supply is an authorized distributor of Dwyer products.
Technical Specifications
| Model | LFMA-01-A2 |
| Series | LFM (LFMA body) |
| Service | Water |
| Flow Range | 0.1 to 1 GPM water |
| Metric Flow Range | 0.5 to 4 LPM water |
| Scale | 3 in. (76 mm), dual GPM and LPM, direct reading |
| Accuracy | ±5% full scale |
| Pressure Limit | 87 psi (6 bar) at 68°F (20°C) |
| Temperature Limits | Varies with pressure; see the temperature vs. pressure chart in the instruction manual |
| Process Connection | 1/2 in. male NPT, both ends |
| Standard Fittings | 1/2 in. male NPT (A-566), ABS |
| Optional Fittings | A-560 20 mm metric union fittings (ABS) |
| Mounting | In-line |
| Body | Polycarbonate |
| Flange Nut | ABS |
| Float Stop | ABS |
| Rod and Float | 316 SS |
| O-Rings | Fluoroelastomer |
| Overall Length | 6-45/64 in. (170.26 mm) |
| Diameter | 1-21/32 in. (42.07 mm) |
| Weight | 2 oz (56.7 g) |
| Calibration Option | NISTCAL-FL2: NIST traceable calibration certificate for variable water flowmeters |
| Installation | Indoor use only or areas without direct sunlight |
Documentation
Frequently Asked Questions
What is the flow range of the Dwyer LFMA-01-A2?
The LFMA-01-A2 measures 0.1 to 1 GPM (0.5 to 4 LPM) of water on a 3 in. (76 mm) dual GPM and LPM scale.
What process connection does the LFMA-01-A2 have?
The LFMA-01-A2 has 1/2 in. male NPT connections on both ends. Optional fittings: A-560 20 mm metric union fittings (ABS).
How accurate is the LFMA-01-A2?
Accuracy is ±5% full scale.
What is the pressure limit of the LFMA-01-A2?
The pressure limit is 87 psi (6 bar) at 68°F (20°C). The limit varies with temperature. Ball valves and solenoid valves can create a water cannon effect on opening that exceeds the rated limits and damages the flowmeter.
Can the LFMA-01-A2 be installed outdoors?
No. Series LFM flowmeters are for indoor use only or areas without direct sunlight, because polycarbonate is adversely affected by ultraviolet light.
How should the LFMA-01-A2 be installed?
Install it in an exact vertical plane aligned with the existing plumbing, with wall or structural supports at the top and bottom so the flowmeter does not carry the weight of the pipes. Hand-tighten the flange nut connection rings and use plumbers tape, not pipe dope, which can craze and crack the housing.
Is NIST traceable calibration available for the LFMA-01-A2?
Yes. Order code NISTCAL-FL2 adds an NIST traceable calibration certificate for variable water flowmeters.
What are the wetted materials of the LFMA-01-A2?
Polycarbonate body, ABS flange nut, ABS float stop, 316 SS rod and float, fluoroelastomer O-rings, and ABS standard fittings.
- Series:
- LFM
- Product Type:
- Variable Area Flowmeter
- Media:
- Water
- Flow Range:
- 0.1-1 GPM
- Connection Type:
- Male NPT
- Connection Size:
- 1/2 in.
- Body Material:
- Polycarbonate
- Max Pressure:
- 87 psi
- Accuracy:
- ±5% FS
- Mounting:
- Vertical
- NIST Calibration:
- Available
