ViR VM-21 Vibration Parameter Indicator
Product description
The ViR VM-21 vibration parameter indicator is designed for determination of vibration parameters of non-rotating equipment parts (units, machines, and mechanisms).
The ViR VM-21 Provides
Continuous determination of vibration parameters of non-rotating equipment parts according to the following parameters:
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Damp µm – vibration displacement, amplitude value;
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Dp-p µm – vibration displacement, peak-to-peak value;
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Drms µm – vibration displacement, RMS value;
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Vamp mm/s – vibration velocity, amplitude value;
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Vp-p mm/s – vibration velocity, peak-to-peak value;
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Vrms mm/s – vibration velocity, RMS value;
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Aamp m/s² – vibration acceleration, amplitude value;
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Ap-p m/s² – vibration acceleration, peak-to-peak value;
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Arms m/s² – vibration acceleration, RMS value.
Determination of Harmonic Components
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¼, ½, 1 (component with the highest level), 2, 3, 4, 5, 6.
Additional Functions
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transmission of measured vibration parameter values via the USB serial interface to external recording and visualization devices;
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illumination of the measurement area (built-in flashlight);
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convenient operation (touch-sensitive buttons) and flexible calibration system using a PC application.
The ViR VM-21 Consists of
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a contact single-channel primary measuring transducer of the PP-VS21M type with magnetic mounting;
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a VM-21 measuring converter.
Technical Characteristics of the ViR VM-21
| Parameter | Specification |
|---|---|
| RMS vibration velocity measurement range | 0.5–50 mm/s |
| Frequency range for vibration parameter measurement (determined by the type of primary transducer) | 10–1000 Hz |
| Measurement resolution | 0.01 |
| Expected maximum permissible relative measurement error of RMS vibration velocity | not more than ±10% |
| Expected amplitude-frequency characteristic (AFC) non-uniformity | not more than ±10% |
| Relative transverse sensitivity coefficient | not more than 4% |
| Information refresh time on the display | 0.5 s |
| Degree of protection of the PP-VS21M primary measuring transducer | IP67 |
| Degree of protection of the VM-21 measuring converter | IP20 |
| Dimensions of the PP-VS21M | Ø16 × 35 mm |
| Magnetic mounting dimensions | Ø20 × 7 mm |
| Cable length | not less than 1000 mm |
| Dimensions of the VM-21 | 10 × 60 × 27 mm |
| Weight of the PP-VS21M without cable and magnetic mounting | not more than 40 g |
| Weight of the VM-21 | not more than 110 g |
| Weight of the magnetic mounting | 15 g |
| Power supply | Li-ion rechargeable battery |
Delivery Set:
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VM-21 measuring converter;
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PP-VS21M primary measuring transducer with magnetic mounting and cable;
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USB cable;
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operating documentation (passport);
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shockproof carrying case;
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software and PC application (optional).




