Таблица перевода единиц измерения давления

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 ∙ 10Па
Па

1 Па = 1000МПа
1 МПа = 7500 мм. рт. ст.
1 МПа = 106 Н/м2

Force sensitive quartz crystal EPKV-10M

 

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.

Applications

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.

Features

  • High resolution and accuracy;
  • Long term quartz crystal stability;
  • Wide temperature range (-40…+80 °C);
  • Low power consumption;
  • Suitable for precision weighting equipment;
  • Cost effective.

Operating conditions / electrical characteristics

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.

Based on the force sensing quartz crystal EPKV-10M the several models of the balances are developed and made.

External dimensions

UNITS: millimeters

epkv dim

 

  1. - surface, on which one pastes the force sensitive quartz crystal EPKV-10M.
  2. - force sensitive quartz crystal EPKV-10M.
  3. - undercut.
  4. - contact surfaces.