The Dwyer IF2704 is a Series IF industrial direct reading variable area flowmeter rated to 1.5 GPM (5.6 LPM) of water and 6.5 SCFM (180 LPM) of air on a dual GPM and SCFM scale that reads flow directly, with no correlation charts. It installs vertically through 1/2 in. female NPT connections.
Best For
- Gas or liquid metering up to 1.5 GPM water or 6.5 SCFM air
- Industrial pneumatic or hydraulic systems
- Lines with 1/2 in. female NPT connections
- Process conditions up to 200 psi (13.8 bar) and 200°F (93°C)
Warranty
1-year limited warranty against defects in materials and workmanship to the original user from the date of shipment.
Key Features
Dual GPM and SCFM Direct-Reading Scale
Reads water flow to 1.5 GPM and air flow to 6.5 SCFM directly, saving time with no correlation charts.
Polycarbonate Front Shield
A detachable, clear 3/16 in. thick polycarbonate front shield protects the flowtube at maximum rated temperature and pressure, with 304 stainless steel side panels.
316 Stainless Steel Wetted Parts
Borosilicate glass flowtube with 316 SS float, guide rods, float stops and end fittings, sealed by fluoroelastomer O-rings.
±3% Full-Scale Accuracy
±3% of full scale accuracy with ±0.5% of full scale repeatability and a 10:1 turn-down ratio.
Industrial Pressure Rating
Rated to 200 psi (13.8 bar) and 200°F (93°C) for industrial service.
NIST Calibration Available
Order with a NIST traceable calibration certificate: NISTCAL-FL1 for air flowmeters or NISTCAL-FL2 for water flowmeters.
ZOT Supply is an authorized distributor of Dwyer products.
Technical Specifications
| Model | IF2704 |
|---|---|
| Series | Dwyer Series IF Industrial Direct Reading Flowmeter |
| Service | Liquids or gases |
| Maximum Flow Rate, Water | 1.5 GPM (5.6 LPM) |
| Maximum Flow Rate, Air | 6.5 SCFM (180 LPM) |
| Scale | Dual scale, GPM and SCFM |
| Tube Size | 2 |
| Accuracy | ±3% of full scale |
| Repeatability | ±0.5% of full scale |
| Turn-Down Ratio | 10:1 |
| Process Connection | 1/2 in. female NPT |
| Mounting | Vertical |
| Temperature Limit | 200°F (93°C) |
| Pressure Limit | 200 psi (13.8 bar) |
| Calibration Conditions | 14.7 psia (0 psig) |
| Flowtube | Borosilicate glass |
| Float, Guide Rods, Float Stops, End Fittings | 316 stainless steel |
| O-Rings | Fluoroelastomer |
| Front Shield | Detachable clear polycarbonate, 3/16 in. thick |
| Side Panels | 304 stainless steel |
| Dimension A (Body Width) | 2 in. (50.8 mm) |
| Dimension B (Overall Length) | 9.54 in. (242 mm) |
| Dimension C (Body Depth) | 2.25 in. (57.2 mm) |
| Dimension D (Body Length) | 8.04 in. (204 mm) |
| NIST Traceable Calibration | Available, NISTCAL-FL1 for air flowmeters or NISTCAL-FL2 for water flowmeters |
Documentation
Frequently Asked Questions
What is the maximum flow rate of the Dwyer IF2704?
The IF2704 reads water flow up to 1.5 GPM (5.6 LPM) and air flow up to 6.5 SCFM (180 LPM) full scale.
What pipe connection size does the Dwyer IF2704 use?
The IF2704 has 1/2 in. female NPT inlet and outlet connections on a tube size 2 body. Seal the threaded pipe connections with PTFE tape only.
What pressure and temperature is the Dwyer IF2704 rated for?
The IF2704 is rated to 200 psi (13.8 bar) and 200°F (93°C).
Can the Dwyer IF2704 measure both air and water?
Yes. The IF2704 has a dual GPM and SCFM direct-reading scale, covering water to 1.5 GPM and air to 6.5 SCFM.
How is the Dwyer IF2704 installed?
Mount the IF2704 vertically with the inlet flow connected at the bottom port. Use properly aligned piping, avoid stress from unsupported pipe weight, and fasten the meter housing to a bulkhead, panel or stanchion. Open the inlet throttling valve gradually to avoid pressure surges on the glass flowtube.
What valves does the Dwyer IF2704 need for gas service?
Install valves at both the inlet and outlet, within 1-1/2 pipe diameters of each port. The outlet valve sets backpressure to prevent float bounce. Start with both valves closed, open the inlet valve about 1/4 turn and the outlet valve a full turn, then open both slowly to the desired flow.
How do I correct the Dwyer IF2704 reading at pressures above atmospheric?
The IF2704 is calibrated at 14.7 psia (0 psig). For gas service at higher pressure, actual flow equals K times indicated flow, where K = ((14.7 + gauge pressure) / 14.7) to the power of -1/2. Discretely calibrated meters are also available on request.
What fluids should not be used with the Dwyer IF2704?
Do not use the IF2704 with strong or hot alkalis, fluorine, hydrofluoric acid or steam, or for air or water service above 200°F (93°C). Confirm that the process fluid is compatible with the borosilicate glass, 316 SS and fluoroelastomer wetted materials.
Is NIST traceable calibration available for the Dwyer IF2704?
Yes. Order a NIST traceable calibration certificate: NISTCAL-FL1 for air flowmeters or NISTCAL-FL2 for water flowmeters.
Specifications verified October 14, 2026 against the Dwyer Series IF catalog page 257, drawing IF_DD and Operating Manual TDV0301MG.
- Series:
- IF
- Product Type:
- Variable Area Flowmeter
- Media:
- Water
- Media:
- Air
- Max Water Flow:
- 1.5 GPM
- Max Air Flow:
- 6.5 SCFM
- Connection Type:
- Female NPT
- Connection Size:
- 1/2 in.
- Max Pressure:
- 200 psi
- Max Temperature:
- 200°F
- Accuracy:
- ±3% FS
- Mounting:
- Vertical
- NIST Calibration:
- Available
