328ER250

Telephone +44 (0)1493 602602 Fax +44 (0)1493 665111 Email:sales@midassensors.com www.midassensors.com Electra House, 32 Southtown Road Great Yarmouth, Norfolk NR31 0DU, England PROWAVE Air Ultrasonic Ceramic Transducers 328ET/R250 Dimensions: dimensions are in mm Impedance/Phase Angle vs. Frequency Specification Transmitter 328ER250 Receiver Center Frequency 32.8±1.0Khz Bandwidth (-6dB) 328ET250 1.0Khz 328ER250 1.0Khz Max. Driving Voltage (cont.) 90 75 60 45 30 15 0 -15 -30 -45 -60 -75 -90 10000 1000 100 28 29 30 31 32 33 34 35 38 Sensitivity/Sound Pressure Level -67dB min. 2400 pF 20Vrms Storage Temperature -40 to 85°C 33° typical All specification taken typical at 25°C Closer frequency tolerance can be supplied upon request. -50 130 -55 125 -60 120 -65 115 -70 110 -75 105 -80 100 -85 95 -90 90 28 29 30 31 32 33 34 35 37 Frequency (Khz) Beam Angle: Tested at 32.8Khz frequency 330 300 Model available: 270 0 0 -6 -12 -18 -24 -30 30 60 90 240 Aluminum Housing Black Alum. Housing 36 120 210 180 150 38 SPL (dB) Tested under 10Vrms @30cm -30 to 80°C 328ET/R250 328ET/R25B 37 113dB min. -6dB Total Beam Angle Operation Temperature 1 2 36 Frequency (Khz) Sensitivity (dB) Transmitting Sound Pressure Level at 32.8Khz; 0dB re 0.0002µbar per 10Vrms at 30cm Receiving Sensitivity at 32.8Khz 0dB = 1 volt/µbar Capacitance at 1Khz ±20% Impedance (Ohm) 100000 328ET250 Phase Angle (Degree) Tested under 1Vrms Oscillation Level 328ER250 Impedance 328ER250 Phase 328ET250 Impedance 328ET250 Phase PROWAVE Air Ultrasonic Ceramic Transducers 328ET/R250 328ET250 Transmitter Sensitivity Variation vs. Loaded Resistor SPL Variation vs. Driving Voltage -40 130 -45 125 -50 120 -55 115 SPL (dB) Sensitivity (dB) 328ER250 Receiver -60 -65 110 100 -75 95 -80 Max. Driving Voltage (Cont.) 20Vrms 105 -70 90 1K 3.9K 10K 39K 100K 390K 0 2 4 6 8 10 12 Loaded Resistor (Ohm) 18 20 22 24 26 28 30 Center Frequency Shift vs. Driving Voltage 0.0 -1.0 Fc Variation % Fc Variation % 5.0 4.0 3.0 2.0 1.0 0.0 -1.0 -2.0 -3.0 -4.0 -5.0 -2.0 -3.0 -4.0 Max. Driving Voltage (Cont.) 20Vrms -5.0 -6.0 -7.0 1K 3.9K 10K 39K 100K 390K 0 2 4 6 8 10 12 Loaded Resistor (Ohm) 14 16 18 20 22 24 26 28 30 Vrms Sensitivity Variation vs. Temperature SPL Variation vs. Temperature -40 130 -45 125 -50 120 -55 115 SPL (dB) Sensitivity (dB) 16 Vrms Center Frequency Shift vs. Loaded Resistor -60 -65 110 105 -70 100 -75 95 -80 90 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 -40 -30 -20 -10 0 Temperature (Degree C) Fc Variation % 0 10 20 30 40 50 Temperature (Degree C) 20 30 40 50 60 70 80 90 100 Center Frequency Shift vs. Temperature 5.0 4.0 3.0 2.0 1.0 0.0 -1.0 -2.0 -3.0 -4.0 -5.0 -40 -30 -20 -10 10 Temperature (Degree C) Center Frequency Shift vs. Temperature Fc Variation % 14 60 70 80 90 100 5.0 4.0 3.0 2.0 1.0 0.0 -1.0 -2.0 -3.0 -4.0 -5.0 -40 -30 -20 -10 0 10 20 30 40 50 Temperature (Degree C) 60 70 80 90 100