The problem with inaccurate flow sensors I had already questioned once, so I had resolved to check every now and then what has happened so. With the Alphacool ES flow and temperature sensor “HighFlow” with tachometer signal (what a terribly bulky name!) Alphacool has a flow sensor in the portfolio, which works amazingly accurate for its abundant 38 euros. Unfortunately, there is no own evaluation electronics with USB connection or even display, you only get the rpm as a tacho signal and then have to convert the values read out on the motherboard yourself. The fact that the part also has a reasonably accurate (but somewhat sluggish) temperature sensor definitely helps here if the motherboard has a suitable connector. If not: Tough luck.
The product from Alphacool has the advantage that nothing can break that is not on it. The turbine sensor works from approx. 40 l/h, before that inertia throws a spanner in the works. We will compare the part with my reference sensor and the High Flow Next from Aqua Computer during today’s measurement. I evaluated and logged everything with HWInfo64, but I’ll get to that in a moment. Back to the sensor.
The relatively compact Alphacool ES “HighFlow” flow and temperature sensor can be easily integrated into any water circuit thanks to its two G1/4″ female threads, regardless of whether hoses or hard tubes are used. The appropriate connectors are simply screwed to the sensor and placed anywhere in the water circuit, taking care not to position the sensor immediately after a bend. It doesn’t like eddies and turbulence at all (due to its design). The connection and evaluation is made via the supplied 42 cm long Hall sensor cable at the corresponding mainboard connector. It is also imperative that the direction of installation (and thus the direction of flow) be observed.
A classic NTC 10 kOhm thermistor serves as an additional temperature sensor, which should enable a readable temperature range of -40 to 125 °C. In the test, it was only barely two degrees off (slightly above) consistently in the range of 20 to 40 degrees, but it does not react particularly quickly. The 43.5 cm long cable ends in a common 2-pin connector. Many motherboards already have direct connection options for such sensors, but you have to check this yourself. External controllers with NTC connection naturally also offer connection options for this sensor.
The data sheet gives the interested reader even more information about the technical data and features:
Alphacool_ES_Durchfluss_Temperatursensor_HighFlow_mit_Tachosignal_ManualAlphacool ES "HighFlow", Durchfluss- und Temperatursensor mit Tachosignal (17558)
 | Lagernd im Außenlager, Lieferung 2-3 WerktageStand: 15.10.24 16:43 | 39,04 €*Stand: 15.10.24 16:49 |
 | Im Außenlager verfügbar | 39,05 €*Stand: 15.10.24 14:35 |
 | Lagernd im Versandlager - Lieferzeit 2-5 Werktage | 39,57 €*Stand: 15.10.24 16:32 |
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