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In this regard, we ask in advance to schedule a trip for us, as well as possible orders. All current paid orders will be shipped in accordance with specified delivery dates.

 

PRESSURE SENSING QUARTZ CRYSTAL RESONATOR RKMA-P

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rkma p 

APPLICATIONS
RKMA-P is a quartz crystal resonator whose construction consist of measuring quartz crystal packaged to rectangular quartz crystal case. Frequency of oscillation of RKMA-P varies with pressure-induced stress. 
The crystal designed for function as a component of the precision electronic pressure transducers, manometers and controllers with a frequency output for conversion the current values of absolute pressure to frequency.


-       High resolution and accuracy
-       Long term quartz crystal stability
-       Wide temperature range (-55…+80 °C), there is an opportunity of expansion of a temperature range of up to 150 °C and 200 °C
-       Low power consumption
-       Suitable for precision pressure equipment
Standard line of RKMA-P is made. See the following tables (page 1) and drawings (page 2), please.

PARAMETERS

SPECIFICATIONS AND REMARKS

UNITS

Electrical characteristics

Model of the crystal

RKMA-P-1

RKMA-P-3

RKMA-P-4

RKMA-P-2(21)

Frequency Range, fO

32.000…48.000

kHz

Series resistance typ./max., RS

120; 150 / 200

150; 200 / 250

kOhm

Drive level max., DL

4.0

µW

Insulation resistance min., IR

400

M

Motional characteristics

F(P)=fO +A1*P +A2*P2+ A3*P3,

There: F(P) – crystal’s frequency at current value of pressure P (Hz),
fO – crystal’s frequency at zero value of pressure P (Hz),
P current value of pressure (MPa), A1 – the first degree linear coefficient,
A2, A3 – the second and the third degree coefficients. They are determinate a nonlinearity which value less than 0.4% FS.*

Operation conditions

Model of the crystal

Pressure Range, P MPa

UNIT

Sensitivity (Linear Coefficient A1)

UNIT

Overall Dimensions

UNIT

RKMA-0.1-1 (3;4)

0 – 0.10

MPa

21350.00 ± 5…20%FS

Hz/MPa

25 x 23 x 3.0 (5.0)

mm

RKMA-0.25-1 (3;4)

0 – 0.25

MPa

7853.14 ± 5…20%FS

Hz/MPa

25 x 23 x 3.2 (5.1)

mm

RKMA-0.4-1 (3;4)

0 – 0.40

MPa

5415.45 ± 5…20%FS

Hz/MPa

25 x 23 x 3.3 (5.2)

mm

RKMA-0.6-1 (3;4)

0 – 0.60

MPa

3144.25 ± 5…20%FS

Hz/MPa

25 x 23 x 3.5 (5.45)

mm

RKMA-1.0-1 (3;4)

0 – 1.00

MPa

1518.88 ± 5…20%FS

Hz/MPa

25 x 23 x 4.45 (6.4)

mm

RKMA-1.6-1 (3)

0 – 1.60

MPa

1092.84 ± 5…20%FS

Hz/MPa

25 x 23 x 3.65 (5.6)

mm

RKMA-2.5-1 (3)

0 – 2.50

MPa

678.055 ± 5…20%FS

Hz/MPa

25 x 23 x 4.55 (6.5)

mm

RKMA-4.0-1 (3)

0 – 4.00

MPa

434.55 ± 5…20%FS

Hz/MPa

25 x 23 x 4.8 (6.75)

mm

RKMA-6.0-1 (3)

0 – 6.00

MPa

294.77 ± 5…20%FS

Hz/MPa

25 x 23 x 5.5 (7.45)

mm

RKMA-10.0-1 (3)

0 – 10.0

MPa

160.06 ± 5…20%FS

Hz/MPa

25 х 23 х 5,15 (7,1)

mm

RKMA-16.0-1 (3)

0 – 16.0

MPa

127.51 ± 5…20%FS

Hz/MPa

25 х 23 х 5,6 (7,5)

mm

RKMA-25.0-1 (3)

0 – 25.0

MPa

58.76 ± 5…20%FS

Hz/MPa

25 х 23 х 6,1 (8,1)

mm

РКМА-0.1-2 (21)

0 – 0.10

MPa

17551.76 ± 5…20%FS

Hz/MPa

11 x 12 x 1.15 (dia 14.5 x 1.15)

mm

РКМА-0.15-2 (21)

0 – 0.15

MPa

11251.13 ± 5…20%FS

Hz/MPa

11 x 12 x 1.19 (dia 14.5 x 1.19)

mm

РКМА-0.2-2 (21)

0 – 0.20

MPa

8025.80 ± 5…20%FS

Hz/MPa

11 x 12 x 1.19 (dia 14.5 x 1.19)

mm

РКМА-0.4-2 (21)

0 – 0.40

MPa

3975.40 ± 5…20%FS

Hz/MPa

11 x 12 x 1.19 (dia 14.5 x 1.19)

mm

РКМА-0.45-2 (21)

0 – 0.45

MPa

3675.37 ± 5…20%FS

Hz/MPa

11 x 12 x 1.20 (dia 14.5 x 1.20)

mm

РКМА-1.2-2 (21)

0 – 1.20

MPa

1275.13 ± 5…20%FS

Hz/MPa

11 x 12 x 1.30 (dia 14.5 x 1.30)

mm

Operating Temperature, TOPR (typ/max)

-55…+80 / -40…+100; -196…+250**

°C

Storage Temperature, TSTR

-55…+85

°C

Maximum Deviation Over Temperature

± 0.75 / 1.00

%

Relative Deviation of linear coefficient A1 from its average value (gets out at the request)

± 5…± 20

%

Aging first year/next years max.

± 5 / ± 25

PPM

FS Pressure Hysteresis no more

0.02

%

Dependence Of Frequency Of The Crystal On Temperature fT=fO +A1*T +A2*T2
is reproduced with accuracy

0.05

%

Vibration Resistance, DF/F0

5g / 10-2000 Hz, 8 hours / ±7 PPM max.

PPM

*A1, A2 and A3 coefficients are specified on request.
**Temperature range can be increased from -196 to +250 °C on request.
Temperature sensing quartz crystal RKT206 or RKTV206 is used for compensation of a temperature deviation of RKMA-P.
Based on the pressure sensing quartz crystal resonators RKMA-P the pressure transducers, manometers and controllers with a compensation of the temperature error (accuracy class up to 0.03) are developed and made.

EXTERNAL DIMENSIONS

There are 4 basic variants of model of a pressure sensing quartz crystal resonator RKMA-P.
RKMA-P-1 after fastening to a transducer’s case is in a free condition.
RKMA-P-21 is small size variant.
RKMA-P-3 has an additional cover by which it is glued to surface for temperature isolation.
RKMA-P-4 has the metal connecting pipe through which the measured pressure acts. 

UNITS: millimeters

RKMA-P-1 RKMA-P-3 RKMA-P-4
rkma p1 rkma p3 rkma p4
   RKMA-P-21

 

  rkma 022  
1- Cover; 2- Gasket; 3- Diaphragm; 4- Contact surfaces.    

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