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Pneumatic shaft pressure monitoring — catch the leak before the roll does
An expandable shaft is inflated once and then nobody looks at it. A slow leak shows up later as a winding defect and wasted material. The measurement is simple; the hard part is getting a reading off a rotating part without a slip ring.
Why a battery sensor, not a slip ring
A slip ring is a maintenance item and a cable through a rotating part is a failure waiting to happen. A battery-powered transmitter on the shaft, with a fixed reader on the machine, removes both. That is the same platform we use for vehicle pressure sensing, applied to a fixed machine.
Pneumatic shaft pressure monitoring: 0-500 kPa, phone readout
Pneumatic shaft pressure monitoring: 0-500 kPa gauge at ±2 kPa, IP67, BLE, no slip ring.
The advantage of a battery sensor on a rotating pneumatic shaft is that there is no slip ring and no cable: the standard sensor range is 0-500 kPa gauge at ±2 kPa, IP67 sealed, reporting over 2.4 GHz BLE 4.1. Most expandable shafts run above that range, so the honest answer is that the standard unit covers low-pressure circuits and the mounting and range have to be discussed before anything is promised.
Read this before assuming the range fits
Our standard sensor range is 0–500 kPa gauge, about 5 bar. A typical pneumatic shaft runs at around 7 bar, which is above that standard range — so this application needs a different pressure sensor rather than the catalogue part. We will say that plainly in the first reply instead of shipping something that reads saturated. Tell us the working pressure and we will tell you what is possible.
The mounting question we ask first
A shaft is a closed steel body and radio does not pass through steel. The first question is therefore where the measuring point sits: inside an air chamber that is smaller than the shaft diameter, or outside at the shaft end. Send a photo of the shaft end and the air connection and we will answer in writing before quoting.
Specifications (BLE sensor, standard range)
| Parameter | Value |
|---|---|
| Pressure range (standard) | 0–500 kPa gauge (0–600 kPa absolute) |
| Accuracy | ±2 kPa |
| Ingress protection | IP67 |
| Operating temperature | −20 to +80 °C |
| Battery | CR1632, replaceable, about 1.5 years average life; pairing survives a battery change |
| Radio | 2.4 GHz BLE 5.1, no receiver and no wiring; reading on a phone |
| Above the standard range | A different sensor, or a regulator ahead of the measuring point — stated before quoting |
| Not measured | Flow, temperature of the medium, or load — pressure only |
Want samples or a specification for your programme?
Tell us the vehicle, wheel count, where the data should go, and the label language for your market. We answer in writing.
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