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Analog water pressure sensor (transducer) from the Huba Control Type 505 family, code 505.91572. It continuously measures the water pressure in the combi boiler's heating circuit and reports it to the PCB as a ratiometric voltage signal.
The distinguishing features of this variant: 0…4 bar measuring range, ratiometric 10…50% output, 5 V (4.75…5.25 V) supply and threaded G3/8 port.
Huba manufactures the same 0…4 bar sensor with different supply and port options. This product operates on 5 V and its output is ratiometric: the output voltage scales with the supply voltage, it is not fixed.
| Code | Supply | Output | Port |
|---|---|---|---|
| 505.91572 ← this product | 5 V (4.75…5.25 V) | ratiometric 10…50% | threaded G3/8 |
| 505.91590 | 24 V (8.5…30 V) | 0.5…3.5 V fixed | push-fit, O-ring |
The two variants are interchangeable neither mechanically nor electrically. If the 5 V sensor is fitted to a 24 V circuit, it will be damaged. Before ordering, compare the IN: line on the body of the removed part and the port type (threaded or push-fit).
In a ratiometric sensor, the output is a percentage of the supply voltage. In this product the 10…50% range is used; that is, at a nominal 5 V supply the output moves between 0.5…2.5 V:
| System pressure | Supply percentage | Output at 5.00 V supply |
|---|---|---|
| 0 bar | 10% | 0.50 V |
| 1.0 bar | 20% | 1.00 V |
| 1.5 bar (normal operation) | 25% | 1.25 V |
| 2.0 bar | 30% | 1.50 V |
| 4.0 bar | 50% | 2.50 V |
🪤 When measuring, measure the supply first: if the supply is 4.80 V, the output drops in the same proportion. Evaluating the output on its own is misleading with a ratiometric sensor — it is always read together with the supply.
🪤 This sensor is not tested by ohm (resistance) measurement — it is not an NTC, it has integrated electronics inside.
The typical picture: the pressure gauge shows normal pressure, there is water in the system, no leak — but the combi boiler gives a low water pressure error. Topping up with water and resetting do not help.
| Manufacturer / Type | Huba Control AG (Switzerland) — Type 505 |
| Code | 505.91572 |
| Measuring range | 0…4 bar (relative) |
| Output | Ratiometric 10…50% — 0.5…2.5 V at 5 V supply |
| Supply | 5 V direct current (4.75…5.25 V) |
| Pressure port | Threaded G3/8, without orifice |
| Overload / burst | 8 bar / 12 bar |
| Accuracy | better than 1.0% of full scale |
| Temperature | fluid +2…+90 °C · ambient +2…+85 °C |
| Measuring cell | 96% Al₂O₃ ceramic, with integrated electronics |
| Seal material | EPDM · G3/8 port O-ring 14 × 1.78 mm |
| Connector | RAST 2.5 (AMP DUOPLUG 2.5), 3-pin |
| Protection class | III (safety extra-low voltage) |
🪤 Note for Ferroli appliances: Ferroli's Divatop series does not use this sensor but Huba 505.91512 (Ferroli code 39818770). Before ordering for your Ferroli appliance, compare the code, the IN value and the port type on the body of the removed sensor with this product.
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