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 ∙ 103 Па
Па
1 Па = 1000МПа
1 МПа = 7500 мм. рт. ст.
1 МПа = 106 Н/м2
Quartz pressure transducer PDK-P-M
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.
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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 |
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0,25 |
0,06; 0,1; 0,15 |
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0,4 |
0,06; 0,1; 0,15 |
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0,6 |
0,06; 0,1; 0,15 |
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1,0 |
0,06; 0,1; 0,15 |
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1,6 |
0,06; 0,1; 0,15 |
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0,1 |
0,25 |
0,06; 0,1; 0,15 |
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0,6 |
0,06; 0,1; 0,15 |
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0,4 |
0,06; 0,1; 0,15 |
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1,0 |
0,06; 0,1; 0,15 |
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1,6 |
0,06; 0,1; 0,15 |
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from 2,5 to 25,0 |
0,06; 0,1; 0,15 |
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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 |
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0,16 |
0,06; 0,1; 0,15 |
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0,25 |
0,06; 0,1; 0,15 |
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0,4 |
0,06; 0,1; 0,15 |
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0,6 |
0,06; 0,1; 0,15 |
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1,0 |
0,06; 0,1; 0,15 |
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1,6 |
0,06; 0,1; 0,15 |
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59,9·10-3 |
0,106 |
0,025; 0,04; 0,06; 0,1; 0,15 |
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0,16 |
0,025; 0,04; 0,06; 0,1; 0,15 |
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0,25 |
0,025; 0,04; 0,06; 0,1; 0,15 |
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0,4 |
0,06; 0,1; 0,15 |
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0,6 |
0,06; 0,1; 0,15 |
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1,0 |
0,06; 0,1; 0,15 |
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1,6 |
0,06; 0,1; 0,15 |
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0,1 |
0,25 |
0,06; 0,1; 0,15 |
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0,4 |
0,06; 0,1; 0,15 |
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0,6 |
0,06; 0,1; 0,15 |
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1,0 |
0,06; 0,1; 0,15 |
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1,6 |
0,06; 0,1; 0,15 |
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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 |
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0,16 |
0,06; 0,1; 0,15 |
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0,25 |
0,06; 0,1; 0,15 |
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45·10-3 |
0,106 |
0,025; 0,04; 0,06; 0,1; 0,15 |
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0,16 |
0,025; 0,04; 0,06; 0,1; 0,15 |
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0,25 |
0,025; 0,04; 0,06; 0,1; 0,15 |
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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 |
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0,16 |
0,06; 0,1; 0,15 |
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0,25 |
0,06; 0,1; 0,15 |
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0,4 |
0,06; 0,1; 0,15 |
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0,6 |
0,06; 0,1; 0,15 |
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1,0 |
0,06; 0,1; 0,15 |
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1,6 |
0,06; 0,1; 0,15 |
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59,9·10-3 |
0,106 |
0,025; 0,04; 0,06; 0,1; 0,15 |
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0,16 |
0,025; 0,04; 0,06; 0,1; 0,15 |
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0,25 |
0,025; 0,04; 0,06; 0,1; 0,15 |
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Note: In graph « Symbol » Р – the upper limit of the measurement of absolute pressure in MPa; B – basic (main) error; Х – type of connector. |
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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.