Ultraflux UF801-P Portable Clamp-On Flow Meter
Portable clamp-on flow meter with data logger and optional BTU energy kit. Water, corrosive chemicals, fuels. From $9,999.
SZ00U30020
A portable ultrasonic flow meter walks up to a live pipe, straps on, gives you a flow rate in minutes, logs it, and leaves. No cut, no shutdown, no trace. One instrument meters every pipe in the plant.
Permanent meters answer one question about one pipe, forever. A portable clamp-on flow meter answers any question about any pipe, once. That is a completely different job, and it is the job most plants actually have.
The instrument is a handheld or case-sized transmitter, a pair of clamp-on ultrasonic transducers, a strap or rail mount, and a tube of couplant. You measure the pipe, enter its dimensions, clamp the transducers to the outside, and read flow. Nothing is cut. Nothing is drained. The process never stops.
Flow surveys and energy audits. You need flow rates from thirty pipes and you have a week. A portable clamp-on meter is the only instrument that makes this economically possible.
Verifying meters nobody trusts. Every plant has a permanently installed flow meter that reads something the operators stopped believing years ago. A portable is an independent, non-invasive second opinion. Clamp it on the same line and compare. This use case alone pays for the instrument in most facilities — and it is why clamp-on portables are routinely used as the reference against which inline meters are checked.
Balancing and commissioning. Hydronic balancing, pump curve verification, commissioning a new loop. You need to know what each branch is actually doing, and you need to know today.
Leak detection. Finding a leak in a distribution network means metering successive segments and hunting a small difference. The Ultraflux UF801-P resolves velocities down to ±0.03 ft/s specifically for this.
Temporary data collection. Building a case for a capital project, establishing a baseline, documenting a discharge. You need the data, not a permanent instrument.
It is not a budget decision, it is a question decision. Many pipes, occasionally → portable. One pipe, continuously, into a control system → fixed. The physics and accuracy are the same. What differs is the enclosure, the mount, the outputs, and the couplant grade. Most plants that get serious about flow end up owning both.
You will see these called handheld ultrasonic flow meters, portable ultrasonic flow meters, portable clamp-on flow meters, portable transit-time flow meters, and strap-on flow meters. Same category. Some genuinely are handheld — the METRI Ultra ProLite is 230 g and fits in a jacket pocket. Others are a transmitter in a carry case with transducers on cables, which is what you want above a few inches of pipe because the transducers need to be spaced along the run.
Portable clamp-on flow meter with data logger and optional BTU energy kit. Water, corrosive chemicals, fuels. From $9,999.
SZ00U30020
Portable clamp-on ultrasonic flow meter. Widest pipe range in the catalog: 0.5 in to 393 in. IP68. From $8,999.
SZ00U30006
Pocket-sized transit-time clamp-on flow meter, DN10-DN2000. 230 g. Made in Britain. Premium accuracy from $3,999.
SZ00ICLUPL24
Portable clamp-on Doppler flow meter for dirty liquids — sludge, slurry, raw wastewater, aerated streams.
C6PF
| If your situation is… | Buy | Because |
|---|---|---|
| Flow surveys and energy audits; the data must be logged and defensible | Ultraflux UF801-P | Multi-parameter data logger, DSP with automatic Reynolds detection, optional BTU energy kit. Resolves ±0.03 ft/s for leak work. |
| Pipe sizes from lab lines to transmission mains | Ultraflux Minisonic II P | 0.5″ to 393″ in one instrument. IP68. On-screen echo diagnostics. |
| Equipping a team, or capability on a controlled budget | METRI Ultra ProLite | 230 g, DN10–DN2000, signal oscilloscope, integral wall thickness gauge. Made in Britain. |
| Sludge, slurry, raw wastewater, anything with solids | Compu-Flow C6 Portable Doppler | Transit-time cannot read dirty fluid. Doppler requires it. |
| The pipe is not running full | Area velocity, not clamp-on | A clamp-on meter will report roughly double the real flow and look confident doing it. |
| You need this once and never again | Rent it | We rent from Houston, nationwide. We will tell you when this is the right call. |
A portable clamp-on flow meter is only as good as the thirty seconds you spend choosing where to put it. Technicians who get consistent, trustworthy numbers do four things that technicians who get garbage do not.
Find the longest straight run available. 10 diameters upstream, 5 downstream, 30 downstream of a pump. If the first place you reach is four diameters after an elbow, keep walking. Five extra minutes is the difference between a number and a guess.
Transit-time meters compute volumetric flow from velocity and cross-sectional area, and they get the area from the numbers you type in. A wall thickness off by 10% puts a systematic error into every reading, displayed to four decimal places with total confidence. Corroded, scaled, or re-lined pipe is rarely the thickness the drawing says. The METRI Ultra ProLite has an integral wall thickness gauge (2–24 mm) precisely for this. Use it.
Wire-brush the mounting area to clean, sound metal. Thin, well-bonded paint is usually acceptable. Loose paint, rust scale, and mill scale are not — they trap air, and air stops ultrasound dead.
More than feels right. Its only job is to eliminate the air film between transducer face and pipe. On hot pipes use a high-temperature grade — standard gel will run off or bake out, and your signal will fade over the course of the survey in a way that looks like a real flow change.
Every decent transit-time instrument reports signal strength, gain, or a quality index alongside the flow rate. Look at it. A flow reading with weak signal is not a flow reading, it is a number. If signal is marginal, re-seat with more couplant, switch between reflect and diagonal mode, or move to better pipe. Do not write down a number the instrument is quietly telling you it does not believe.
Fifteen to forty minutes for a first-time setup on a given pipe, most of which is pipe preparation and entering pipe data. The Ultraflux UF801-P claims five-minute setup once you know the pipe. Returning to a pipe you have measured before is faster — the instruments store site profiles you can recall.
Yes, and it is one of the most valuable things these instruments do. A clamp-on portable is an independent, non-invasive second opinion on a permanently installed meter, without taking that meter out of service. Install with proper straight-run clearance and compare. You are comparing two instruments, each with its own uncertainty — a disagreement tells you to investigate, not automatically that the inline meter is wrong.
Paint, if thin and well-bonded, is usually fine. Loose or flaking paint must come off. Insulation must be removed at the transducer locations — you need direct contact between transducer and pipe wall through couplant, nothing else.
You can get a reading. Whether it is a correct reading is another question — the flow profile has not recovered and the meter is reading a skewed velocity distribution. If you have no alternative, use it for relative trending rather than absolute measurement, note the condition in your report, and understand that the absolute number carries an uncertainty you cannot quantify. Where possible, walk the line for a better location.
Surveys and audits with a defensible data record → Ultraflux UF801-P. Pipe sizes from tiny to enormous → Minisonic II P (0.5″ to 393″). Equipping a team, or serious capability at a lower price → METRI Ultra ProLite (230 g). Dirty fluid → Compu-Flow C6 Portable Doppler. Or use the selector.
If you need the number once and have no ongoing use, yes. Seztec rents portable clamp-on flow meters from Houston, shipping nationwide. We will tell you when renting is the right call rather than sell you an instrument you will use twice. See rental.
Send us the pipe sizes, materials, and fluids you need to survey. We will tell you which instrument covers your range — and whether renting makes more sense than buying.
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