| |
|
|
|
| |
|
|
|
| |
|
|
Quantity |
| |
|
|
Density of body p is a derived physical quantity which defined as
a rate mass of body m to its volume V: p = m/V.
|
| |
|
|
Unit - kg/m3. Other used units are g/cm3 =
10-3kg/m3 and mg/cm3 = kg/m3.
|
| |
|
|
Tasks
of the laboratory
|
| |
 |
Available
metrological services |
| |
|
|
Calibration
of standard areometers with constant mass: |
| |
|
|
| Areometer |
Value
of graduation |
Range |
| Areometer
for alcohol |
d = 0.5
kg/m3 |
730 -
830 kg/m3 |
| d = 0.2
kg/m3 |
980 -
1000 kg/m3 |
| Alcoholometers |
d = 0.2
% volume |
0 - 88
% |
| d = 0.1
% volume |
87 -
100 % |
| Areometers
for milk |
d = 0.2
kg/m3 |
1015 -
1030 kg/m3 |
| Sugarmeters |
d = 0.1
% weight |
0 - 25
% |
| Mustmeters |
d = 0.5
kg/hl |
10 - 30
kg/hl |
| Areometers
for crude oil |
d = 0.5
kg/m3 |
830 -
890 kg/m3 |
| Areom
for general purposes |
d = 0.2
kg/m3 |
600 -
2000 kg/m3 |
|
| |
|
|
Verification
of working measuring instruments (laboratory aerometers).
Calibration and verification of laboratory glass:
graduated vessels up to 50 l, volumetric flasks up to 2
l, graduated pipettes and non-graduated pipetts,
burettes. Calibration of vibration densimeters (for
industial purposes). |
| |
|
Methods
of measurement: |
| |
|
|
- standards
areometers are calibrated by method of hydrostatic
weighing in a reference liquid (density of reference
liquid -nonane- is stated by the hydrostatic weighing of
quartz divers). Uncertainties of data determination of
areometric scale are not hinger than: 0.04 kg·m-3
(for d = 0.1 kg·m-3), 0.04 kg·m-3
(for d = 0.2 kg·m-3), 0.03 % (d = 0.1 %),
0.04 % ( d = 0.2 %), 0.05 % (d = 0.5 %);
- ordinary areometers are verified by the direct
comparative method in accordance with SMU working
procedures (comparing them to standards in reference
liquid);
- vibration densimeters: coefficients of calibration
function are determinated by least squares method. |
| |
|
|
|
| |
|
Instruments
in use |
| |
|
|
The National
density Standard consists of sets of quartz
devers, which volume is stated by the method of
hydrostatic-weighing - coming out from the redistilled
water density. The measuring device of: analytical
balances Mettler (installed at vibration pillar,
temperature stability of ± 0.5°C) and mass standards,
thermostatic bath Tamson with facilities, device for air
density measurement, thermometers, device for water
preparation.
Vibration densimeters are calibrated by a reference
liquids at semi automatic device for determination of
liquid density by hydrostatic weighing. The device under
computer control loads and lifts a quartz diver to
balance suspension. From balance reading the liquid
density is determined. |
| |
|
|
|
|
| |
|
|
| Contact |
| Dr.
Robert Spurný |
Mrs.
Katarína Špendlová |
| phone:
+ 421 2 60294 350 |
phone:
+ 421 2 60294 216 |
| e-mail:
spurny@smu.gov.sk |
|
|