A colocation operator deploying direct-to-chip liquid cooling needed to verify the coolant flow their CDUs were delivering to each rack manifold. The stakes made every inline option a non-starter: a leak in a live cooling loop can take out a rack of hardware, and a turbine meter in the loop is both a moving part and a debris source in a fluid path that has to stay pristine.
Portable clamp-on transit-time measurement on the secondary loop distribution. The transducers mount on the outside of the pipe — nothing wetted, nothing to leak, nothing shed into the propylene-glycol/water coolant. The METRI Ultra ProLite suited the job: light enough to move rack to rack, and precise enough to confirm each CDU against its own internal reading.
Glycol concentration. Speed of sound in a glycol/water mix depends on the mix ratio and temperature. The concentration was confirmed and entered correctly — a guessed value would have produced a confident wrong reading.
Pipe size. The secondary runs were on the small side for clamp-on, so the transducer frequency and mounting were confirmed on a sample line before the survey, not assumed.
In liquid cooling, the feature that sells clamp-on is the one it refuses to do: touch the coolant. Confirm pipe size and glycol mix up front and it is close to the ideal instrument for the job.
Send us the pipe and the fluid and we will tell you what will actually work.
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