www.sktbelpa.yaroslavl.ru
SCTB ElPA Ltd.: 20-b Ribinskoe shosse, Uglich of Yaroslavl region, 152613 Russia
Phone/Fax: +7-(08532) 546-74; 533-53 E-mail: sktbelpa@yaroslavl.ru
www.sktbelpa.yaroslavl.ru
7
2
5
.
0
0
+
0
.
5
0
0
.
0
0
23.00
+0.50
0.00
P1
P2
1
2
3
4
5
6
DIFFERENTIAL PRESSURE SENSING QUARTZ CRYSTAL RESONATOR
BLOCK BRKM-P
APPLICATIONS
BRKM-P is a quartz crystal resonator whose construction consist of measuring and
reference quartz crystals packaged to rectangular quartz crystal case. Frequency of oscillation
of BRKM-P varies with pressure-induced stress. The crystal designed for function as a
component of the precision electronic differential pressure transducers, manometers and
controllers with a frequency output for conversion the current values of absolute pressure and
overpressure (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 overpressure BRKM-P is intended for conversion of overpressure to a differential frequency output signal
F=F
MEASURING
F
REFERENCE
. An absolute pressure (overpressure) P1 (look at the picture of external dimensions) stressed on diaphragm (1).
Absolute atmospheric pressure (basic pressure) 2 operates on a diaphragm (3). It can supply to the reference resonator through the metal
connecting pipe (6). One end of the connecting pipe is attached to an outlet of the quartz block, and the second - to an internal cavity of
the case of the gauge (5) where BRKM-P settle down, perceiving overpressure 1. 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
32.000...48.000
kHz
Series Resistance typ./max., R
S
200 / 250
kOhm
Drive Level max., D
L
3.0
W
Insulation Resistance min., IR
400
M
Motional characteristics
F(P)=f
O
+A
1
*P +A
2
*P
2
+ A
3
*P
3
,
There: F(P) crystal's frequency at current value of pressure P (Hz),
f
O
crystal's frequency at zero value of pressure P (Hz),
P current value of pressure (MPa),
A
2
, A
3
the second and the third order coefficients. They are determinate a nonlinearity which value less than 0.4% FS.*
Operation conditions
Sensitivity (Linear Coefficient A
1
)
Model of the
crystal
Pressure Range,
MPa
UNIT
measuring crystal
reference crystal
UNIT
Overall Dimensions /
Weight
UNIT
BRKM-0.16
0 0.16
MPa
7959
5...20%FS
Hz/MPa
25 x 23 x 4.5 / 6.0
mm / gm
BRKM-0.5
0 0.50
MPa
3367
5...20%FS
Hz/MPa
25 x 23 x 5.1 / 7.0
mm / gm
BRKM-1.5
0 1.50
MPa
1235
5...20%FS
Hz/MPa
25 x 23 x 7.0 / 9.5
mm / gm
BRKM-6.0
0 6.00
MPa
304
5...20%FS
Hz/MPa
25 x 23 x 10.4 / 17.0
mm / gm
BRKM-16.0
0 16.00
MPa
127
5...20%FS
Hz/MPa
25 x 23 x 12.2 / 18.5
mm / gm
Pressure Range, P
0.1...25.0
MPa
Reference Crystal's Pressure range
79.98...106.64
kPa
Change of a difference of frequencies of measuring and reference crystals in
an operation temperature range for every 10 no more, %
0.1
%
Operating Temperature, T
OPR
(typ/max)
-55...+80 / -40...+100; -196...+250**
C
Storage Temperature, T
STR
+5...+40
C
Maximum Deviation Over Temperature
0.75
%
Relative Deviation of linear coefficient A
1
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 f
T
=f
O
+A
1
*T+A
2
*T
2
is reproduced with accuracy
0.05
%
Vibration Resistance,
F/F
0
5g / 10-2000 Hz, 8 hours / 7 PPM max.
PPM
*A
1
, A
2
and A
3
coefficients are specified on request.
**Temperature range can be increased from -196 to +250 C on request.
Temperature sensing quartz crystal RKT206 is used for compensation of a temperature deviation of BRKM-P.
Based on the differential pressure sensing quartz crystal resonator blocks BRKM-P the differential pressure transducers,
manometers and controllers with a compensation of the temperature error (accuracy class up to 0.03) are developed and made.
EXTERNAL DIMENSIONS
UNITS: millimeters
1 bottom diaphragm
2 - gasket
3 up diaphragm
4 cover
5 gauge internal cavity
6 connecting pipe
7 contact surfaces
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