Sourced and supplied across Saudi Arabia
The method is decided by whether you can touch the shaft, and on most running plant you cannot. A contact tachometer with a rubber tip is accurate and cheap but requires access to a shaft end and a hand held against rotating machinery, which many permits will not allow. An optical tachometer reads a strip of reflective tape from a safe distance and is the usual answer, provided somebody can get the tape onto the shaft during a shutdown — plan that in, because the tape is the part that is missing when the meter arrives. A stroboscope needs neither contact nor tape: it freezes the rotation optically, which also makes it the tool for looking at a coupling or a fan blade while it turns. Its one trap is harmonics, since a strobe will show an apparently stationary image at multiples and submultiples of the true speed, so the reading is confirmed by working down from the highest frequency that freezes the image.
The more of this you send, the closer the first quotation lands.
| Measurement method | Contact, optical, stroboscopic, or a combined instrument |
|---|---|
| Speed range | Minimum and maximum RPM to be measured |
| Access to the shaft | Whether a shaft end is reachable while running |
| Reflective tape | Order tape with an optical unit — it is applied at shutdown |
| Standoff distance | How far the operator must stand from the rotating part |
| Surface speed | State if linear speed or length totalising is also needed |
| Accuracy and resolution | What the reading is used to decide |
| Logging | Memory, min and max hold, or download to a computer |
| Hazardous area | State the zone if an Ex instrument is required |
| Power | Battery type and expected runtime between changes |
| Calibration | State if a traceable certificate and a recall interval are required |
| Quantity | Units, and the teams they will be issued to |
Select one and it travels with your enquiry. Not sure? Leave it and describe the application instead.
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