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

Quartz pressure transducer PDK-P-M (hereinafter referred to as the transducers) are intended for measuring the absolute pressure of liquids and gases, as well as for controlling technological processes

The appearance of transducers is shown in Figure 1.

pdk 10 pdk 20  pdk 22  pdk 23

Model 10 (№1 in table 1)

Model 20 (№2 in table1)

Model 22 (№3 in table 1)

Model 23 (№4 in table 1)

Figure 1 – the general form of quartz pressure transducers PDK type

Metrological and technical characteristics

Table 1.

Symbol

№ models

The lower limit of measurement (MPa)

The upper limit of measurement (MPa)

Limits basic error of ± γ, (%)

PDK-Р-B-М-10Х

PDK-Р-B-МR-10Х

PDK-Р-B-МТ-10Х

PDK-Р-B-МRТ-10Х

10

0,6·10-3

 

 

0,106

0,06; 0,1; 0,15

0,16

0,06; 0,1; 0,15

0,25

0,06; 0,1; 0,15

0,4

0,06; 0,1; 0,15

0,6

0,06; 0,1; 0,15

1,0

0,06; 0,1; 0,15

1,6

0,06; 0,1; 0,15

0,1

0,25

0,06; 0,1; 0,15

0,6

0,06; 0,1; 0,15

0,4

0,06; 0,1; 0,15

1,0

0,06; 0,1; 0,15

1,6

0,06; 0,1; 0,15

from 2,5 to 25,0

0,06; 0,1; 0,15

PDK-Р-B-М-20Х

PDK-Р-B-МR-20Х

PDK-Р-B-МТ-20Х

PDK-Р-B-МRТ-20Х

20

0,6·10-3

0,106

0,06; 0,1; 0,15

0,16

0,06; 0,1; 0,15

0,25

0,06; 0,1; 0,15

0,4

0,06; 0,1; 0,15

0,6

0,06; 0,1; 0,15

1,0

0,06; 0,1; 0,15

1,6

0,06; 0,1; 0,15

59,9·10-3

0,106

0,025; 0,04; 0,06; 0,1; 0,15

0,16

0,025; 0,04; 0,06; 0,1; 0,15

0,25

0,025; 0,04; 0,06; 0,1; 0,15

0,4

0,06; 0,1; 0,15

0,6

0,06; 0,1; 0,15

1,0

0,06; 0,1; 0,15

1,6

0,06; 0,1; 0,15

0,1

0,25

0,06; 0,1; 0,15

0,4

0,06; 0,1; 0,15

0,6

0,06; 0,1; 0,15

1,0

0,06; 0,1; 0,15

1,6

0,06; 0,1; 0,15

PDK-Р-B-М-22Х

PDK-Р-B-МR-22Х

PDK-Р-B-МТ-22Х

PDK-Р-B-МRТ-22Х

22

0,6·10-3

0,106

0,06; 0,1; 0,15

0,16

0,06; 0,1; 0,15

0,25

0,06; 0,1; 0,15

45·10-3

0,106

0,025; 0,04; 0,06; 0,1; 0,15

0,16

0,025; 0,04; 0,06; 0,1; 0,15

0,25

0,025; 0,04; 0,06; 0,1; 0,15

PDK-Р-B-М-23Х

PDK-Р-B-МR-23Х

PDK-Р-B-МТ-23Х

PDK-Р-B-МRТ-23Х

23

0,6·10-3

 

 

 

0,106

0,06; 0,1; 0,15

0,16

0,06; 0,1; 0,15

0,25

0,06; 0,1; 0,15

0,4

0,06; 0,1; 0,15

0,6

0,06; 0,1; 0,15

1,0

0,06; 0,1; 0,15

1,6

0,06; 0,1; 0,15

59,9·10-3

0,106

0,025; 0,04; 0,06; 0,1; 0,15

0,16

0,025; 0,04; 0,06; 0,1; 0,15

0,25

0,025; 0,04; 0,06; 0,1; 0,15

Note: In graph « Symbol » Р – the upper limit of the measurement of absolute pressure in MPa; B – basic (main) error; Х – type of connector.

Output signal:

- version М -   one output signal: frequency, kHz                              from 40 to 50;

- version МR – one output signal: frequency, kHz                             from 0,3 to 5,5;

- version МТ – two output signals:

 the frequency of the pressure being measured, kHz                                   from 40 to 50;

 frequency signal for temperature

 error transducer compensation, kHz                                                from 30 to 33;

- version МRТ – two output signals:

the frequency of the measured pressure, kHz                                               from 0,3 to 5,5;

frequency signal for temperature

 error transducer compensation, kHz                                                from 0,3 to 2.

Operating-temperature range,  оC                                                      from minus 40 to plus 85;

                                                                                                             from minus 40 to plus 45

(for converters with a limit of basic error of not more than ±0,025% and  ±0,04%)        

Additional error from

influence of temperature changes

ambient air,% / 10 º C                                                                                     from  ±0,005  to ±0,075.                   

(depending on the version)

Power supply Usup, V                                                                           from 3 to 14.

Current consumption must not exceed, mA                                       6,0; 12,0.

(Depending on the version)

Mean time to failure, not less than an hour.                                        65000.

Weight (depending on the version), kg                                               from 0,45 to 0,6.

Overall dimensions of transducers

(depending on model), not more, mm                                    

 (diameter×length):                                                                             48×109,5;

42×106;

                                                                                                          40×90,0.

Description of measuring instrument

The principle of operation of the transducer is based on a change in the frequency of natural oscillations of a quartz power-sensitive piezoelectric element depending on the measured pressure. The measured pressure deforms the membrane with a force-sensitive piezo element fixed on it and proportionally changes the frequency of its own vibrations.

The transducer is structurally made in a cylindrical housing made of stainless steel or aluminum alloy. The housing has a measuring chamber and an electronics compartment. An absolute pressure quartz resonator (RKMA) is used as a sensitive element, which consists of a membrane, a highly sensitive piezoelectric element - mounted on the membrane, gaskets and covers. All RKMA parts are made of monocrystalline quartz and are connected by low-melting glass. The cavity between the membrane and the cover is evacuated. RKMA is installed in the measuring compartment and connected through a sealed current leads to a self-oscillator, which is installed in the electronics compartment.

Materials in contact with the measured medium (depending on version): 12X18H10T, aluminum alloy D16, single-crystal quartz, glue UP-5-207, solder protection LF-32LN varnish, rubber sealing ring.

The transducer is designed to work with secondary regulating and indicating equipment, regulators and other automation devices, centralized control machines and control systems that work with measuring information signals with a frequency of 100 to 48000 Hz and a pulse amplitude of 2.4 to 14 V.

The transducers are available in four versions: М, МР, МТ, МРТ, which differ from each other by the number of frequency channels.

It is also possible to manufacture such transducers with digital interfaces RS-485, UART, I2C, SPI.