Keyence FT-H30C Flowmeter Sensor: Complete Technical Guide for Industrial Automation

The Keyence FT-H30C is a clamp-on flow sensor from Keyence's FT series — it straps onto the outside of a coolant tube and tracks flow without cutting the line or letting the liquid touch the sensing element. This product page carries no purchase record and no photo set on our side, so what follows is a spec-oriented overview rather than a delivery report; confirm exact tubing ranges and output options against the Keyence datasheet before ordering.

What the FT series does

Cooling loops fail quietly: a pump cavitates, a fitting clogs, flow drops to a trickle while temperature stays acceptable for a while. The FT series addresses that by clamping around the supply tube and converting flow into an electrical signal the controller can watch — no wetted parts, no leak path added, no need to break into plumbing that was already certified. On semiconductor tools, laser chillers and machining centers, that non-intrusive property is usually the reason the part was specified in the first place.

Where the FT-H30C fits

The FT-H30C code sits inside a family where the suffix picks the tubing diameter and output style. Rather than guessing a flow range from the part number, size the sensor against the actual tube OD and the expected L/min window of your loop — mismatched sizing is the common failure when these are bought second-hand.

Installation and checks

Clamp-on sensing depends on the coupling between sensor and tube: mount on a straight run away from bends and pumps, seat the clamp squarely, and keep the tube material and wall thickness consistent with what the sensor is calibrated for. Bubbles are the classic false reading — bleed the loop, then verify with a bucket-and-stopwatch test at two flow points before trusting the alarm thresholds.

Second-hand buying notes

Because this record has no photos of an actual unit, treat any FT-H30C purchase as a datasheet-first decision: ask the seller for a photo of the label (the sub-model suffix matters), check the clamp size against your tubing, and budget for an amplifier/display unit if yours is missing — a bare sensor without its matching unit is a common lot on the surplus market.

Related records

For process-side measurement with full delivery photos, see the Rosemount 3051TG4 pressure transmitter; for the coolant hardware itself, the FN60B-ZL brushless fan motor covers the heat-rejection side.