The M_one and M_10 vacuum mass comparators are automated weighing system consisting of a 1 kg/10 kg capacity, 0.1 μg /1 μg readability mass comparator and an automated weight handler contained within a vacuum chamber. The system delivers the best possible mass measurements under controlled environmental conditions from ambient pressure down to a vacuum of 10-6 mbar.
Vacuum mass comparators achieve the highest level of accuracy by performing mass determination at constant pressure or in a vacuum. Our M_one and M_10 vacuum comparators accommodate various shaped artefacts and deliver accurate results within 100 nanograms.
METTLER TOLEDO’s M_one vacuum mass comparator sets the benchmark in ultra-high precision weighing. Masses can be determined with an accuracy of 100 nanograms, a proven typical repeatability of 300 nanograms and a result data comparison of 10 nanograms.
The unique Artefact Storage and Transport Vessel (ASTV) keeps objects in the stable conditions of a vacuum or inert gas while also preventing them from being contaminated.
To maintain the controlled environment inside the M_one, artefacts are transferred directly from their ASTV to the weighing chamber via the Load Lock, which incorporates an Artefact Transfer Device (ATD).
Thanks to the unique STAR-shaped weighing pan, the M_one accommodates multiple weights and artefacts from 1 mg up to 1 kg. Silicon spheres up to 100 mm in diameter and density artefacts can be placed directly on the weighing pan.
The large quick-loading door provides direct access to the weight handler inside the weighing chamber for fast and ergonomic loading of weights and artefacts.
The M_one, Load Lock, Artefact Transfer Device, and the vacuum pumping systems have been built on a modular basis. This gives you the flexibility to configure your own initial system and expand it according to the demands of your applications and as budget permits.
The AGC positions all types of artefacts precisely in their gravimetric center before the measurement is taken. This reduces eccentricity error to a minimum and ensures the highest possible measurement repeatability.
The M_Control software gives you complete control over your vacuum mass calibration processes. With the optional Efficiency Pack, post-processing of air buoyancy provides an increased level of measurement accuracy.
| M_one Comparator | M_10 Comparator | |
| Article No. | On Request | On Request |
| OIML Calibration Range E0 | 100 g - 1 kg* | 1 kg - 10 kg |
| OIML Calibration Range E1 | 100 g - 1 kg* | 1 kg - 10 kg |
| OIML Calibration Range E2 | 100 g - 1 kg* | 1 kg - 10 kg |
| OIML Calibration Range F1 | 100 g - 1 kg* | 1 kg - 10 kg |
| OIML Calibration Range F2 | 100 g - 1 kg* | 1 kg - 10 kg |
| Maximum load | 1001.5 g | 10011 g |
| Readability | 0.1 μg | 1.0 μg |
| Repeatability at nominal load (5x ABA, measured at) | 0.5 μg | 8.0 μg |
| Repeatability typical ABA | 0.3 μg | 4.0 μg |
| Electrical weighing range | 1.5 g | 11 g |
| Dial weights | External | External |
| Linearity (electrical weighing range) | 2 μg | ±8 μg |
| Eccentric load deviation (at test load) | 0.0 ng (1 g) | 0.0 ng (10 g) |
| Settling time | 30 s | 30 s |
| Adjustment built-in | Motorized | Motorized |
| Adjustment with external weight | 1 g | 10 g |
| *Enhance calibration range down to 1 mg by utilizing support weights | ||
| Standard Equipment | ||
| Weight handler | Turntable, 6 positions | Turntable, 4 positions |
| Software and controller | Windows®, standard | Windows®, standard |
| Vacuum chamber | Round bell jar | Round bell jar |
| Self centering pan | Integrated | Integrated |
| Weighing pan | Hanging pan | Hanging pan |
| SmartScreen | Touchscreen | Touchscreen |
| SmartSens | Standard | Standard |
| Separate display | Standard | Standard |
| Admissible Ambient Conditions | ||
| Temperature (°C) | 17 - 27 | 17 - 27 |
| Max. temperature change (°C /12h) | 0.1 | 0.1 |
| Relative humidity (%) | 45 - 60 | 45 - 60 |
| Comparator (WxDxH, mm) | 344 x 440 x 620 | 315 x 720 x 850 |
| Display unit (WxDxH, mm) | 226 x 370 x 155 | 226 x 370 x 155 |
| Comparator weight (kg) | 300 | 350 |
| Object diameter (D, mm) | Cylindrical: 22 - 90 Spherical: 40 - 100 | Cylindrical: 18 - 105 Spherical: 18 - 110 |
| Object height (H, mm) | 100 | 195 |
| Control unit for weight handler (WxDxH, mm) | 202 x 197 x 92 | 202 x 197 x 92 |
| Vacuum chamber (WxDxH, mm) | 684 x 884 x 930 | 684 x 884 x 930 |
| Rack for control & display unit | Optional | Optional |
Vacuum Comparators and Mass Metrology
A vacuum mass comparator is the most accurate balance possible. It weights the mass of an artefact in a vacuum, which means that no air buoyancy correction is needed. Without this correction, a relevant part of the uncertainty calculation can be removed, which means that the overall uncertainty is improved.
To enable national metrology institutes worldwide to compare their standards using the M_one and the M_10, the optional Klimet A30V measures all environmental parameters with the utmost accuracy to determine air density for compensation of air buoyancy influences.
Our versatile automated mass comparators perform fully automated mass comparison up to OIML E1, delivering outstanding accuracy and repeatability. They are particularly suited to high-accuracy mass calibration applications.
E0 calibration weights have a higher accuracy than E1 and enable mass standards to be calibrated at the highest level of metrological performance.
Robotic mass comparators offer fast and accurate mass calibration. They are ideal for high-throughput mass calibration laboratories, offering automated mass comparison up to OIML E1 accuracy.
