CDI 5400 Compressed Air Flow Meter

Clamp-on thermal mass flowmeter for compressed air and nitrogen: two probes through 3/16 in. drilled holes, calibrated per pipe size, with rotating display and milliamp/pulse outputs.

Key advantages

No pipe cutting for a spool — clamps on; seals to the pipe via drilled probe holes.
Pipe-specific calibration — display reads flow directly for the ordered size (2…8 in. / metric sizes).
Milliamp + pulse — user-configurable scaling, filtering, and units; optional wired network outputs.
Weather-resistant — surge protected; display rotates for horizontal or vertical pipe.

Typical applications

Compressor-room output and distribution monitoring in medium/large plants.
Point-of-use monitoring on large compressed-air consumers.
Nitrogen lines within published fluid list.

Selection guide

Pipe sizes — Nominal 2…8 in.; metric 50…101 mm; DN50…DN200 class; Sch. 40 steel, Type L copper, metric aluminum.
Accuracy — 5% of reading plus 1% of range for flows from 10% to 100% of indicated range at 20…120 °F air temperature.
Fluids — Compressed air, nitrogen.
Pressure — 200 psig max on Sch. 40 steel and Type L copper (consult CDI for other materials/higher P).
Power — 250 mA at 24 Vdc; output resistance 600 Ω max.
Materials — Exposed: stainless, gold, thermal epoxy, Viton; ring: aluminum.
Display — Four-digit LED; response ~1 s to 63% of change above 30% of range.
Model examples — 5400-20S (2 in. steel, 600 scfm) through 5400-80S (8 in. steel, 6000 scfm); copper and metric codes available.

Common mistakes

Ordering without stating pipe material and exact OD/schedule — each meter is built for a specific size.
Assuming welded hot-tap hardware — installation uses 3/16 in. drilled holes and clamp ring.
Using on gases outside air/nitrogen without OEM confirmation.
Ignoring the 10%…100% of range accuracy window.
Flow instruments · Flow buying guide

When to RFQ / what to tell us

Pipe material and nominal size (or OD/schedule).
Expected scfm range and pressure.
Output/network options; quantity; ship-to country.

Request a Quote · Get selection help

Specs

Spec	Value
SKU	195162
Brand	CDI Meters
Model	5400
Product type	clamp-on thermal mass compressed-air flowmeter
Measuring range	Pipe-specific scfm ranges (e.g. 600 scfm @ 2 in. to 6000 scfm @ 8 in. steel)
Accuracy	5% of reading + 1% of range (10–100% of indicated range; 20–120 °F air)
Output signal	Milliamp (4–20 mA class) and pulse (convertible to threshold); optional wired network outputs
Supply voltage	24 Vdc, 250 mA
Process connection	Clamp-on ring; two 3/16 in. probe holes
Wetted / exposed materials	Stainless steel, gold, thermal epoxy, Viton; aluminum ring
Max pressure	200 psig on Sch. 40 steel and Type L copper (consult for others)
Notes	Specs from cdimeters.com 5400 product page.

Documents

CDI 5400 product page (OEM)

FAQ

Q: Do I need to cut out a pipe section? A: No — the 5400 clamps on and uses two 3/16 in. drilled holes for the probes.

Q: Air only? A: OEM lists compressed air and nitrogen. Confirm other gases before RFQ.

Q: What should I send for a quote? A: Pipe material/size, expected flow/pressure, outputs, quantity. Compatible with systems using CDI 5400 if you need a drop-in check — we do not claim authorized-dealer status.