Единицы | бар | мм рт.ст. | мм вод.ст. | атм (физич.) | кгс/м2 | кгс/см2 (технич. атм.) | Па | кПа | Мпа |
---|---|---|---|---|---|---|---|---|---|
1 бар | 1 | 750.064 | 10197,16 | 0.986923 | 10.1972 ∙ 103 | 1,01972 | 105 | 100 | 0.1 |
1 мм рт.ст. | 1.33322 ∙10-3 | 1 | 13,5951 | 1.31579 ∙10-3 | 13,5951 | 13.5951 ∙10-3 | 133.322 | 133.322 ∙10-3 | 133.322 ∙10-6 |
1 мм вод.ст. | 98.0665 ∙10-6 | 73.5561 ∙ 10 -3 | 1 | 96.7841 ∙10-6 | 1 | 0.1∙10-3 | 9.80665 | 9.80665 ∙10-3 | 9.80665 ∙10-6 |
1 атм | 1.01325 | 760 | 10.3323 ∙103 | 1 | 10.3323∙ 103 | 1.03323 | 101.325 ∙ 103 | 101.325 | 101.325 ∙10-3 |
1 кгс/м2 | 98,0665 ∙10-6 | 73.5561 ∙ 10 -3 | 1 | 96.7841 ∙10-6 | 1 | 0.1∙10-3 | 9.80665 | 9.80665 ∙10 -3 | 9.80665 ∙10-6 |
1 кгс/см2 | 0,980665 | 735.561 | 10000 | 0.967841 | 10000 | 1 | 98.0665 ∙ 103 | 98.0665 | 98.0665 ∙10-3 |
1 Па | 10 -5 | 7.50064 ∙10-3 | 0,1019716 | 9.86923 ∙10-6 | 101.972 ∙ 10-3 | 10.1972 ∙10-6 | 1 | 10 -3 | 10 -6 |
1 кПа | 0.01 | 7.50064 | 101,9716 | 9.86923 ∙10-3 | 101.972 | 10.1972 ∙10-3 | 103 | 1 | 10 -3 |
1 МПа | 10 | 7.50064 ∙103 | 101971,6 | 9.86923 | 101.972 ∙103 | 10.1972 | 106 | 103 | 1 |
К системе СИ относятся: Инженерные единицы:
Бар
1 бар = 0,1 Мпа 1 мм рт.ст. = 13.6 мм вод.ст.
1 бар = 10197.16 кгс/м2 1 мм вод.ст. = 0.0001кгс/см2
1 бар = 10 Н/см2 1 мм вод.ст. = 1 кгс/м2
1 атм = 101.325 ∙ 103 Па
Па
1 Па = 1000МПа
1 МПа = 7500 мм. рт. ст.
1 МПа = 106 Н/м2
Force sensitive quartz crystal EPKV-10M. Based on the force sensing quartz crystal EPKV-10M the several models of the balances are developed and made.
Force sensitive quartz crystals EPKV-10M are intended for operation in a structure of precision electronic balances and serves for conversion of efforts of stress-strain to a frequency. Using this crystal, it is possible to design balances for weighing with a split-hair accuracy of weights by a mass from several milligrams up to hundreds kilograms.
PARAMETERS |
SPECIFICATIONS AND REMARKS |
UNITS |
|
Electrical characteristics |
|||
Frequency Range (Fundamental mode), fO |
9960…10100 |
kHz |
|
Series resistance typ./max., RS |
30; 50 / 50 |
Ohm |
|
Drive level max., DL |
1.0 |
mW |
|
Operation conditions |
|||
Force sensitivity |
3.5 ± 0.3 |
Hz/gm |
|
Operating Temperature, TOPR (typ/max) |
-40…+80 / -60…+100 |
°C |
|
Storage Temperature, TSTR |
+5…+40 |
°C |
|
Maximum Frequency Deviation |
9.8 ± 0.85 |
kHz |
|
Maximum Limited Load Of Stress-Strain |
± 5…± 20 |
kg |
|
Frequency tolerance, f/fO |
± 50 |
PPM |
|
Aging first year/next years max. |
± 5 / ± 25 |
PPM |
|
Static capacitance typ., CO |
9.1…8.1 |
pF |
|
Capacitance Ratio |
200 |
||
Size |
4 x 10 x 0.17 |
mm |
A side with one electrode of the force sensitive quartz crystal EPKV-10M is glued by epoxy adhesive on preliminary cleared and skim surface, thus the central part of the crystal should be free (see figure). After drying glue the two wires are soldered to contacts of the crystal, if it is required.
If the crystal is in a free condition, its force sensitivity characteristic is practically linear.
If the crystal is pasted, a nonlinearity of the force sensitivity characteristic it is necessary to determining individually.
UNITS: millimeters