Air injection ultrasonic transducer BBDM-34KR8M

immersiblefor level measurementfor obstacle detection

Overview
The BBDM-34KR8M is an air-coupled ultrasonic transducer with a 34 kHz centre frequency. It is designed for level and distance measurement in industrial environments, with a recommended measuring range of 0.5 to 8 m and IP68 protection for immersion or dusty conditions.

Typical applications

• Tank and vessel level measurement
• Distance measurement on industrial equipment
• Collision avoidance for vehicles and machinery
• Security or area monitoring

Acoustic path and target response
The lower end of the recommended range is 0.5 m. Tank necks, internal fittings, guards and nearby machine parts within the acoustic path can generate echoes. Small, angled or irregular surfaces may return weaker or altered echoes compared with broad, perpendicular targets; beam angle and target geometry should be considered in installation.

Electrical interface
Key electrical interface data: minimum impedance is 3,400 ohm, capacitance 1,700 pF at 1 kHz, and the peak-voltage limit is below 1,500 Vpp. These values guide drive circuitry and matching for reliable operation.

Electrical, acoustic and environmental specifications (table)
Parameter : Specification
Model : BBDM-34KR8M
Center frequency : 34 kHz ±5%
Recommended range : 0.5-8 m
Minimum impedance : 3,400 ohm ±20%
Capacitance : 1,700 pF ±20% at 1 kHz
Operating voltage : Peak voltage below 1,500 Vpp
Operating temperature : -40 to +80 °C
Pressure rating : Up to 3 kgf / 0.3 MPa
Beam characteristic : -3 dB half-power angle: 21° ±10%
Protection rating : IP68

Technical specifications

• Model: BBDM-34KR8M
• Center frequency: 34 kHz ±5%
• Recommended measuring range: 0.5–8 m
• -3 dB half-power angle (beam): 21° ±10%
• Minimum impedance: 3,400 Ω ±20%
• Capacitance: 1,700 pF ±20% @ 1 kHz
• Operating voltage: peak voltage below 1,500 Vpp
• Operating temperature range: -40 °C to +80 °C
• Pressure rating: up to 3 kgf / 0.3 MPa
• Protection rating: IP68