High-frequency ultrasonic transducer BBDM-2MR2M

for level measurement

Overview
The BBDM-2MR2M is an externally mounted ultrasonic transducer for non-contact liquid level detection through tank walls. With a 2 MHz center frequency and a recommended measuring range of 0.03–2 m, it is suited to fuel and oil tanks, sealed vessels, vehicle and machinery tanks, and corrosive liquid applications where through-wall sensing is required.

Narrow-beam performance
The transducer has a -3 dB half-power angle of 2.4° ±10%. The narrow acoustic beam increases sensitivity to alignment, wall thickness, curvature and coupling; small angular or contact deviations can displace the acoustic path from the liquid interface and affect measurement accuracy.

Main technical specifications

• Model: BBDM-2MR2M
• Center frequency: 2 MHz ±5%
• Recommended range: 0.03–2 m
• Minimum impedance: 10 ohm ±20%
• Capacitance: 2300 pF ±20% at 1 kHz
• Operating voltage: peak voltage below 150 Vpp
• Operating temperature: -40 to +80 °C (aluminum/PI); -20 to +80 °C (nylon option)
• Pressure rating: up to 10 kgf / 1 MPa
• Beam characteristic: -3 dB half-power angle 2.4° ±10%
• Housing material: 2A12 aluminum alloy and PI; alternative: Nylon
• Protection rating: IP68
• Weight: 240 g ±5%
• Cable configuration: 5 m + 1 m

Available material and temperature configurations
Two housing options are offered and must be ordered as separate configurations: 2A12 aluminum alloy with PI (operating temperature -40 to +80 °C) and a nylon housing option (operating temperature -20 to +80 °C). Confirm the selected housing and its temperature rating when ordering; do not mix ranges between options.

Coupling and electronics
Before specifying installation and drive electronics, confirm tank-wall material, wall thickness, curvature and coatings, and select an appropriate coupling method for the actual liquid and sensing path. The 10-ohm minimum impedance presents a different electrical load than higher-impedance tank transducers; drive circuitry must remain below 150 Vpp. Confirm the termination and definition of the 5 m + 1 m cable arrangement with the project requirements.

Technical specifications

• Model: BBDM-2MR2M
• Center frequency: 2 MHz ±5%
• Recommended range: 0.03–2 m
• Minimum impedance: 10 ohm ±20%
• Capacitance: 2300 pF ±20% at 1 kHz
• Operating voltage: peak < 150 Vpp
• Operating temperature: -40 to +80 °C (2A12 aluminium + PI); -20 to +80 °C (Nylon)
• Pressure rating: up to 10 kgf / 1 MPa
• Beam: -3 dB half-power angle 2.4° ±10%
• Housing: 2A12 aluminum alloy & PI; alternative Nylon
• Mounting: refer to product dimensional drawing
• Protection: IP68
• Weight: 240 g ±5%
• Cable: 5 m + 1 m