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

pdtk p md eng

Hightemperature quartz pressure and temperature transducers PDTK-P-MD manufacturing in 2019 year

Applications

Quartz pressure and high temperature transducers assign for precision measuring of pressure in oil and gas downholes at high temperature.

 

Leading particulars

  • Quartz piezoresonance sensitive pressure crystal;
  • Quartz temperature-sensitive crystal;
  • High long-term stability;
  • Pressure measuring error till ±0,06% FS;
  • High pressure channel resolution ±0,0003% FS;
  • High temperature channel resolution ±0,005% FS;
  • Wide interval of operating temperatures till 180°С;
  • Frequency output signal ensure possibility of measuring without A to D converter;
  • Bellows separator made of stainless steel 12Х18Н10Т, 36НХТЮ or Inconel 625;
  • Case made of stainless steel 12Х18Н10Т or Inconel 718.

 

Technical specification

PDTK-MD transducers provides precision measuring of absolute pressure and temperature in hostile environment for example in oil or gas downholes.  The compensation of temperature error enable to use the transducer in wide temperature range. Oil-filled bellows separator made of stainless steel provides the protection of quartz crystal from hostile environment and passing the pressure with minimum error. Quartz pressure and temperature sensitive crystal provides high long-term stability of measuring.

Parameters

Values

Units

Maximum measuring absolute pressure Р

25

40

60

MPa

Pressure sensitivity

-81±5

-62±3

-42±3

Hz/MPa

Minimum measuring pressure

0,07

% FS

Pressure resolution*

±0,0003

% FS

Maximum operating temperature

180

°С

Maximum temperature of operability

180

°С

Minimum operating temperature

0; +20

°С

Temperature resolution*

±0,005

°С

Temperature sensitivity at 37°С

2

Hz/°С

Basic error, (γ)

±0,06; ±0,1; ±0,15; ±0,25; ±0,5

% FS

Temperature error

±0,3; ±0,5

°С

Zero drift at the working  till 130°С

γ

% FS in a year

Zero drift  at the working from 130°С  till 180°С

% FS in a year

Frequency of quartz pressure crystal at P=atm.

50.0 ±2.5/ 0.8±0.3

kHz

Frequency of quartz temperature sensitive crystal at 25°С

32.7±0.3 / 0.5±0.2

kHz

Weight, no more

350

gr

*depend on scheme of oscillator

Size (drawing) of the transducers are on page 2.

Value of measuring pressure and temperature is possible to calculate using polynoms:

  1. P=P0+a1Ft+ a2Ft2+ a3Fp+ a4Fp2+a5FtFp,

  2. Т=To+c1Ft+c2Ft2+c3Ft3

 

Fp - frequency value of pressure channel; Ft - frequency value of temperature channel;

Ро,То,a1, a2, a3, a4, a5, c1, c2, c3, - coefficients calculated at calibration of the transducer (are in passport supplying with the transducer). The polynoms with the big quantity of coefficients can be used for making the accuracy less in the wide temperature range.

Information for the order

To order the transducer you can contact by e-mail This email address is being protected from spambots. You need JavaScript enabled to view it. or by telephone 8(48532)5-46-74. You should point operating pressure range, operating temperature range, basic error, body model, output signal, type of oscillator (self or different frequency for frequency output signal).

 

The structure of marking high temperature transducers for the order: PDTK-P-E-Т-MD-ХХ-АХ

PDTK – quartz pressure and temperature;

Р – upper limit of measuring pressure in MPa;

E- basic error, % from upper limit of measuring (FS) (possible values: 0,1; 0,15; 0,25; 0,5);

Т – upper limit of operating  temperatures, 0С  (180);

М – metal case;

D – downhole (application);

ХХ – generation of transducers  and modification of the case (2Х, 4Х look attachment 1)

А – modification by output signal (each generation and modification of the case have three modifications by output signals with the next marking):

- F output signal in the view of frequency from pressure and temperature channels, Х – marking of  self-oscillator type:

- «0» - satisfy to modification of transducer without electronics, for connecting  to excitation system of free oscillation or to customer’s oscillator. Besides the transducer is previously calibrating with the oscillator, which is dismantling before shipping the transducer to the customer.

 

The examples of designation quartz pressure and temperature transducers: 

  1. with the upper limit of pressure measuring 60 MPa, with basic error ±0,1 from FS, with the upper operating temperature 180 0С, downhole, without electronics. 

PDТК-60,0-0,1-180-МD-45-F0.

 Variants of transducer’s manufacturing 

1. PDTK-Р-E-Т-МD-22-Ax

2. PDТК-Р-E-Т-МD-45-Ax

3.  PDTK-P-E-T-MD-31-F0 

High-temperature

High-temperature

High-temperature

P - 25; 40; 60 МPа

P - 25; 40; 60 МPа

P - 25; 40; 60 МPа

E - 0,1; 0,15; 0,25; 0,5 %

E - 0,1; 0,15; 0,25; 0,5 %

E - 0,1; 0,15; 0,25; 0,5 %

T -  180 °С

T -  180 °С

T -  180 °С

Аx - F0.

Аx - F0.

Аx - F0.

 

Overall dimension (Sizes: mm)

  1. PDТК-Р-E-Т-МD-22-F0

pd e d 22 eng 

  1. PDТК-Р-E-Т-МD-45-F0

pd e d 45 eng 

  1. PDTK-P-E-T-MD-31-F0

pdtk p e t md 31 eng