Chilled water, hot water, condenser loops, BTU sub-metering, hydronic balancing
This is why clamp-on essentially owns HVAC retrofit metering. The task is usually: find out how much cooling this building, floor, or tenant actually consumes — on a system built without metering, that cannot be shut down.
An inline BTU meter means draining a riser in an occupied building. That is not a measurement project, it is a construction project with a measurement at the end. A clamp-on BTU meter is a technician with a strap and an afternoon.
A chiller is specified and billed in tons, and tons are a thermal energy rate. Without flow and delta-T you cannot verify the machine is delivering what the nameplate claims. Machines quietly stop delivering, and nobody notices until the building is warm.
The Ultraflux UF801-P with its energy kit does flow and delta-T from one box.
Every branch is supposed to be getting a design flow. Some are not. Clamp on, read, adjust, move to the next.
A central plant sells heating and cooling to buildings and somebody has to meter what each building took. Permanent clamp-on BTU meters do this without cutting a single riser.
A chilled water loop in a Houston August and the same loop in January are different orders of magnitude. A meter with narrow turndown goes blind at the bottom of that range and does not tell you — it reports zero or noise, and both look plausible on a trend.
The METRI IC-UPF offers 1:2500. On a seasonal HVAC loop that is not a luxury spec, it is the whole reason to choose the instrument.
On a chilled water loop the delta-T is often small — a handful of degrees. The relative error in a small temperature difference is large, so two temperature sensors each with a modest absolute error can produce a delta-T that is meaningfully wrong even when the flow measurement is excellent.
If your delta-T is small, matched-pair temperature sensors are where your accuracy budget goes, not the flow meter. Most vendors will not tell you this because it does not sell flow meters.
Send us the pipe and the fluid. An application engineer will confirm the right instrument — or tell you clamp-on is the wrong answer, which happens and which we would rather say first.
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