Balancing rotors on site with a portable balancer
This site is a practical guide to field balancing: fixing rotor unbalance on fans, mulchers, crushers and pumps right on the machine, without taking the rotor out. It's built around Balanset-1A, a portable two-channel balancer made by Vibromera, but most of it applies to any two-channel field balancer.
Start here
- Step-by-step field balancing guide: from checking that it really is unbalance, through trial weights and correction weights, to the check run.
- Portable field balancers compared: Balanset-1A next to Erbessd, CEMB, Schenck, Fluke, VMI and Hofmann, with every number linked to the maker's own page.
- Case study: Ferri mulcher, 70 → 1.2 mm/s: what a worn, repeatedly repaired mulcher teaches about balancing.
- FAQ: price, kit, accuracy, delivery, warranty.
Balanset-1A at a glance
| Spec | Balanset-1A |
|---|---|
| Channels | 2, with two accelerometers in the kit |
| Balancing | 1 or 2 planes, rigid rotors in their own bearings |
| Speed measurement | 100 to 100,000 rpm, laser tachometer |
| Vibration velocity | 0.02 to 80 mm/s rms, accuracy ±(0.1 + 10% of the reading) mm/s |
| Phase | 0 to 360°, ±1° |
| Frequency range | 5 to 550 Hz, extendable to 1,000 Hz |
| Protection and temperature | IP54, 5 to 50 °C |
| Computer | Windows laptop, not included |
| In the kit | measuring unit, 2 sensors on 5 m cables, laser tachometer with magnetic stand, reflective tape, scales, software, manual, hard case |
| Price | €1,975 excl. VAT with 5 m cables, €2,025 with 10 m cables |
| Warranty | 2 years |
Source: vibromera.eu and the Balanset-1A operation manual, October 2026.
Who it's for
- Maintenance teams and service companies that balance fans, pumps, crushers and similar machines on site.
- Farmers and contractors who keep mulchers, flail mowers and choppers running.
- Builders of soft-bearing balancing machines, who use it as the measuring system (there's an OEM version without the case, stand and scales).
It's not the right tool for a plant-wide condition monitoring program, for work below 5 °C without protecting the laptop and unit, or where you need IP65.