LifeGuard® Ultrasonic Air Bubble Detector


LifeGuard Ultrasonic Air Bubble Detectors

LifeGuard® ultrasonic air bubble detectors feature proprietary swept frequency technology, making these ultrasonic sensors more reliable and accurate than those utilizing fixed frequency or pulse-type circuitry.

Moog's ultrasonic bubble sensors offer the most flexibility in air bubble sensor sizes, with three standard configurations for common tubing sizes. Additionally, production performance equivalent (quick-turn) custom ultrasonic sensors for use with any tubing size are available utilizing in-house 3D printing capabilities.

Features of LifeGuard Ultrasonic Air Bubble Detectors

  • ISO 13485:2003 quality service certification 
  • Detectors maintain precise sensitivity without calibration
  • Extremely reliable swept-frequency technology prevents ultrasonic sensor performance from drifting with temperature, age or environmental conditions
  • Integrated self-test function provides 100% single fault coverage
  • Dry-couples to PVC, silicone and many other tubing types with thick, thin or reinforced walls
  • Output pulse width is proportional to bubble size — allowing user’s system to monitor subcritical bubbles
  • Chemically compatible with common medical grade cleaners
  • Vibration resistant
  • Wide temperature range stable
  • High reliability: > 1 M hours MTBF
  • Proven performance in life critical equipment
  • Low power consumption
  • RoHS compliant
  • Designed and manufactured in the United States
Product Channel Size Nominal Tubing Size Air
Detection Threshold
Footprint Size
LifeGuard 100
Part No: 53088
.100 in (2.5 mm)
.125 in (3.2 mm) OD
> 10 microliter
1.25 in x .5 in (31.8 mm x 12.7 mm)
LifeGuard 130
Part No: 52861
.130 in (3.3 mm)
.155 in (3.9 mm) OD
> 20 microliter
1.25 in x .5 in (31.8 mm x 12.7 mm)
LifeGuard 200
Part No: 53089
.200 in (5.1 mm)
.250 in (6.4 mm) OD
> 40 microliter
1.25 in x .5 in (31.8 mm x 12.7 mm)

3D Printed

Dependent on nominal tubing size
.060 in - 1.50 in OD (1.5 mm - 38.1 mm)
Variable, depending on configuration
Custom Ultrasonic 
Sensor Solutions
Specifications are custom designed to meet customer’s specific project requirements.