RKMA-P

PRESSURE SENSING QUARTZ CRYSTAL RESONATOR RKMA-P APPLICATIONS RKMA-P is a quartz crystal resonator which is packaged in a rectangular enclosure. The resonance frequency varies with the pressure-induced stress. The crystal unit is designed as a precision electronic pressure sensor for transducer, manometers, and controllers with a frequency output for the conversion of the absolute 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 ELECTRICAL CHARACTERISTICS (at normal climatic conditions) / OPERATING CONDITIONS PARAMETERS Model Frequency range, fO Resonance resistance typ./max., Rr Drive Level max., DL Insulation Resistance min. SPECIFICATIONS AND REMARKS Electrical characteristics UNITS RKMA-P-1 RKMA-P-3 120; 150 / 200 4.0 400 RKMA-P-4 RKMA-P-2 kHz 150; 200 / 250 kΩ µW MΩ 32.000…48.000 Motional characteristics f(P)=fO +A1*P +A2*P2+ A3*P3, There: f(P) – crystal frequency at pressure P (Hz), fO – crystal’s frequency at zero pressure (Hz), P – pressure (MPa), A1 – Linear coefficient = Sensitivity A2, A3 –second and third order coefficients. Nonlinearity less than 0.4% FS.* Operation conditions Model RKMA-0.1-1 (3;4) RKMA-0.1-2 RKMA-0.25-1 (3;4) RKMA-0.4-1 (3;4) RKMA-0.6-1 (3;4) RKMA-1.0-1 (3;4) RKMA-1.6-1 (3) RKMA-2.5-1 (3) RKMA-4.0-1 (3) RKMA-6.0-1 (3) RKMA-10.0-1 (3) RKMA-16.0-1 (3) RKMA-25.0-1 (3) Pressure range, P MPa 0 – 0.10 0 – 0.10 0 – 0.25 0 – 0.40 0 – 0.60 0 – 1.00 0 – 1.60 0 – 2.50 0 – 4.00 0 – 6.00 0 – 10.0 0 – 16.0 0 – 25.0 UNIT MPa MPa MPa MPa MPa MPa MPa MPa MPa MPa MPa MPa MPa Sensitivity (Linear coefficient A1) 21350.00 ± 5…20%FS 5515.45 ± 5…20%FS 7853.14 ± 5…20%FS 5415.45 ± 5…20%FS 3144.25 ± 5…20%FS 1518.88 ± 5…20%FS 1092.84 ± 5…20%FS 678.055 ± 5…20%FS 434.55 ± 5…20%FS 294.77 ± 5…20%FS 160.06 ± 5…20%FS 127.51 ± 5…20%FS 58.76 ± 5…20%FS UNIT Hz/MPa Hz/MPa Hz/MPa Hz/MPa Hz/MPa Hz/MPa Hz/MPa Hz/MPa Hz/MPa Hz/MPa Hz/MPa Hz/MPa Hz/MPa Overall dimensions 25 x 23 x 3.0 (5.0) 11 x 12 x 0.74 25 x 23 x 3.2 (5.1) 25 x 23 x 3.3 (5.2) 25 x 23 x 3.5 (5.45) 25 x 23 x 4.45 (6.4) 25 x 23 x 3.65 (5.6) 25 x 23 x 4.55 (6.5) 25 x 23 x 4.8 (6.75) 25 x 23 x 5.5 (7.45) 25 х 23 х 5,15 (7,1) 25 х 23 х 5,6 (7,5) 25 х 23 х 6,1 (8,1) UNIT mm mm mm mm mm mm mm mm mm mm mm mm mm mm °C °C % % ppm % % ppm RKMA-60.0-1 (3) 0 – 25.0 MPa 33.30 ± 5…20%FS Hz/MPa 25 х 23 х 6,1 (8,8) Operating temperature, TOPR (typ/max) -55…+80 / -40…+100; -269…+250** Storage temperature, TSTR -55…+85 Maximum deviation over temperature 0.75 Relative deviation of the linear coefficient A1 ± 5 …± 2 0 from its average value Aging first year/next years max. ± 5 / ± 25 FS Pressure Hysteresis < 0.02 Reproducibility of temperature dependence of the crystal frequency 0.05 fT=fO +B1*T +B2*T2 Vibration resistance, ∆f/f0 5g / 50-2000 Hz, 8 hours / ±7 ppm max. *A1, A2 and A3 coefficients are specified on request. **Temperature range can be increased from -269 to +250 °C on request. Temperature sensing quartz crystal RKT206 is used for compensation of a temperature deviation of RKMA-P. GmbH & Co. KG Wasemweg 5 D-74821 Mosbach Germany page 1(2) www.AXTAL.com fon: +49 (6261) 939834 fax: +49 (6261) 939836 E-mail: info@axtal.com PACKAGE DIMENSIONS Four basic package variants of RKMA-P are available: RKMA-P-1: RKMA-P-2: RKMA-P-3: RKMA-P-4: basic model for direct fastening on the transducer case. Small size variant of RKMA-P-1 (see “Operation Conditions” table). With additional cover, glued to surface, for temperature isolation. With metal connecting pipe, through which the pressure is guided. UNITS: millimeters RKMA-P-1 (LxWxH=25x23xH) RKMA-P-2 (LxWxH=11x13x0,74) 1 2 4 3 RKMA-P-3 RKMA-P-4 23.00±0.10 23.00±0.1 25.00±0.10 25.00±0.1 25.00±0.1 1- Cover; 2- Gasket; 3- Diaphragm; 4- Contact surfaces. GmbH & Co. KG Wasemweg 5 D-74821 Mosbach Germany page 2(2) www.AXTAL.com fon: +49 (6261) 939834 fax: +49 (6261) 939836 E-mail: info@axtal.com 23.00±0.1