BRKM-P Datasheet, PDF (1/1 Pages) Advanced XTAL Products – DIFFERENTIAL PRESSURE SENSING QUARTZ CRYSTAL RESONATOR BLOCK

DIFFERENTIAL PRESSURE SENSING QUARTZ CRYSTAL RESONATOR BLOCK
BRKM-P
APPLICATIONS
BRKM-P is a quartz crystal resonator assembly, which consists of a measuring and a
reference quartz crystal, both packaged in a rectangular enclosure. The resonance frequency
varies with pressure-induced stress. BRKM-P is designed as a component for precision
electronic differential pressure transducers, manometers and controllers with a frequency
output for conversion of absolute pressure or differential pressure to frequency.
FEATURES
- High resolution and accuracy
- Long term quartz crystal stability
- Wide temperature range (-55…+80 °C)
- Low power consumption
- Suitable for precision pressure equipment
In gauges of differential pressure BRKM-P is used to convert a pressure difference to a differential frequency output signal
fout =f_MEASURING – f_REFERENCE. An absolute pressure ( or differential pressure) P₁ is applied to diaphragm (1), while the absolute atmospheric
pressure (basic pressure) Р₂ acts on diaphragm (3) (see drawing below), which stresses the reference resonator through the metal pipe (6).
One end of the connecting pipe is attached to an outlet of the quartz block, and the second one to an internal cavity of the case of the gauge
(5) where BRKM-P is subjected to the pressure Р₁. The internal cavity of the gauge is usually filled up by oil.
ELECTRICAL CHARACTERISTICS (at normal climatic conditions) / OPERATING CONDITIONS
PARAMETERS
SPECIFICATIONS AND REMARKS UNITS
Electrical characteristics
Frequency Range, f_O
Resonance Resistance typ./max., R_r
Drive Level max., D_L
Insulation Resistance min.
32.000…48.000
kHz
200 / 250
kΩ
3.0
µW
400
MΩ
Motional characteristics
f(P)=f_O +A₁*P +A₂*P²+ A₃*P³
where: f(P) – crystal frequency at pressure P (Hz),
f_O – crystal’s frequency(in Hz) at zero value of pressure P,
A₁ – Linear coefficient = Sensitivity
A₂, A₃ – Second and the third order coefficients*. Nonlinearity less than 0.4% FS.
Operation conditions
Model
Pressure Range UNIT
Sensitivity (Linear Coefficient A₁)
measuring crystal
reference crystal
UNIT
Overall Dimensions /
Weight
BRKM-0.16
0 – 0.16
MPa
7959 ± 5…20%FS
Hz/MPa
25 x 23 x 4.5 / 6.0
BRKM-0.5
0 – 0.50
MPa
3367 ± 5…20%FS
Hz/MPa
25 x 23 x 5.1 / 7.0
BRKM-1.5
0 – 1.50
MPa
1235 ± 5…20%FS
Hz/MPa
25 x 23 x 7.0 / 9.5
BRKM-6.0
0 – 6.00
MPa
304 ± 5…20%FS
Hz/MPa
25 x 23 x 10.4 / 17.0
BRKM-16.0
0 – 16.00
MPa
127 ± 5…20%FS
Hz/MPa
25 x 23 x 12.2 / 18.5
Pressure Range, P
0.1…25.0
Pressure range of Reference Crystal
79.98…106.64
Variation of frequency difference over any 10K within the operating
temperature range
< 0.1
Operating temperature range, T_OPR (typ/max)
Storage temperature, T_STR
Maximum deviation over temperature
-55…+80 / -40…+100; -269…+250**
+5…+40
0.75
Relative deviation of linear coefficient A₁ from its average value
Aging first year/next years max.
± 5…± 20
± 5 / ± 25
FS Pressure Hysteresis
< 0.02
Reproducibility of temperature dependence of crystal frequency
f_T=f_O+B₁*T+B₂*T²
Vibration Resistance, ∆f/f₀
*A₁, A₂ and A₃ coefficients are specified on request.
**Temperature range can be increased from -269 to +250 °C on request.
0.05
5g / 50-2000 Hz, 8 hours / ±7 ppm max.
Temperature sensing quartz crystal RKT206 is used for compensation of a temperature deviation of BRKM-P.
UNIT
mm / g
mm / g
mm / g
mm / g
mm / g
MPa
kPa
%
°C
°C
%
%
ppm
%
%
ppm
+0.50
23.00 0.00
7
PACKAGE DIMENSIONS
P2
UNITS: millimeters
1 – bottom diaphragm
6
2 - gasket
5
3 – upper diaphragm
4
4 – cover
3
2
5 – gauge internal cavity
1
6 – connecting pipe
7 – contact leads
P1
GmbH & Co. KG
Wasemweg 5
D-74821 Mosbach
Germany
page 1(1)
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