Product Line
Bubble Sensors and Air In-Line Sensors
Our highly reliable bubble sensors and air in line detectors include the latest in digital sensing technology that can be calibrated to precisely detect bubbles in almost any fluid and tubing material across a wide range of tubing sizes.
Featured Model
Model A310
AX1X OEM Bubble Sensor — 3/16" OD
The A310 couples directly to the outside of 3/16" OD tubing — no gel, no fluid contact, no contamination risk. Piezoelectric transducers emit ultrasonic waves through the tubing wall; a bubble interrupts the signal and triggers a TTL output in as little as 100 microseconds. Works with PVC, silicone, polyurethane, and glass tubing.
Tubing Size
3/16" OD
Detection
Non-invasive
Coupling
Dry-couple
Applications
Medical · Pharmaceutical
Industries Served
Noninvasive Bubble Sensors
Our noninvasive bubble sensors can be designed for any tubing material: plastic (PVC, fluoropolymers including Teflon, polyethylene, nylon, etc.), silicone, glass, and others. These noncontact, standard bubble sensor models are available for tubes as small as 1/16" OD and as large as 1/2" OD. We also offer custom bubble detectors for larger tubes.
Medical Devices
Infusion pumps, dialysis, blood management
Biopharmaceutical
Drug compounding, single-use biotech systems
Life Science & Lab
LC, microfluidics, lab automation
IV & Fluid Delivery
IV fluid prep, enteral feeding, power injectors
Patient Safety Systems
Air embolism detection, occlusion detection
Analytical Instruments
Sample handling, reagent delivery
Semiconductor
Ultrapure water, chemical dispensing
Industrial
Food processing, process monitoring
Choosing the Right Sensor
Ongoing Innovation in Bubble Sensors
Our newest bubble sensor product line (the AX1X Series) was redesigned from the ground up for medical device OEM users to maximize performance and minimize production costs. We took our 10+ years of experience designing and manufacturing ultrasonic bubble sensors for the medical device industry and used it to optimize and streamline every facet of the design. We have made design improvements such as miniaturizing our transducers to detect smaller bubbles and modernizing our production electronics and tooling. Our tools acquire real-time data from more than a dozen sensors simultaneously during our production testing processes allowing us to offer the best performance at some of the most affordable prices on the market.
If you need
Simple OEM integration, any tubing material
Start with
AX1X Series
Compact low-power TTL output, dry-couples to tubing, 8 sizes from 3/32" to 1/2" OD.
If you need
Secure repeatable tube positioning
Start with
AX30 Series
V-groove or U-groove channel for repeatable seating, 8 sizes, enhanced reliability.
If you need
Bubble AND flow blockage detection
Start with
A240
Dual-function AX30: detects both air bubbles and occlusions in a single unit.
If you need
Ultra-fast response critical systems
Start with
A530
50 µs response time for the fastest-moving fluid detection requirements.
Bubble Sensor Models
AX1X OEM Series — Through-Hole Mounting
Noninvasive ultrasonic bubble detection. Dry-couples to tubing. Optional integrated self-test. Power as low as 3 mA.
| Model | Nominal Tube OD | Min Bubble Size | Dimensions in. [mm] | LED | Mounting | ||
|---|---|---|---|---|---|---|---|
 | A115 | 0.094" [2.38 mm] | 1 µL | 1.40 × 0.80 × 0.68 [35.56 × 20.32 × 17.47] | No | Through hole | View Product |
| A210 | 0.125" [3.17 mm] | 1 µL | 1.44 × 0.85 × 0.68 [36.55 × 21.61 × 17.47] | No | Through hole | View Product |
| A215 | 0.156" [3.97 mm] | 2 µL | 1.47 × 0.89 × 0.68 [37.34 × 22.61 × 17.47] | No | Through hole | View Product |
 | A310 | 0.188" [4.76 mm] | 5 µL | 1.50 × 0.92 × 0.68 [38.10 × 23.37 × 17.47] | No | Through hole | View Product |
 | A410 | 0.25" [6.35 mm] | 10 µL | 1.54 × 0.99 × 0.68 [39.09 × 25.17 × 17.47] | N/A | Through hole | View Product |
| A510 | 0.313" [7.94 mm] | 20 µL | 1.62 × 1.09 × 0.68 [41.15 × 27.69 × 17.47] | N/A | Through hole | View Product |
 | A610 | 0.375" [9.52 mm] | 30 µL | 1.68 × 1.18 × 0.68 [42.67 × 29.97 × 17.47] | N/A | Through hole | View Product |
| A810 | 0.50" [12.70 mm] | 50 µL | 1.74 × 1.27 × 0.68 [44.17 × 32.92 × 17.47] | N/A | Through hole | View Product |
AX30 Series — SAE / Metric Threaded Insert Mounting
Our company-owned and operated production facilities are equipped to perform bubble size testing as small as 0.5 microliters, with options for complete testing on 100% of shipped parts. SMD also executes bubble size testing and report generation for FDA approval processes.
| Model | Nominal Tube OD | Min Bubble Size | Dimensions in. [mm] | LED | Mounting | ||
|---|---|---|---|---|---|---|---|
 | A130 | 0.094" [2.38 mm] | 1 µL | 0.98 × 0.80 × 0.60 [24.9 × 20.3 × 15.2] | LED or No LED | SAE or Metric Threaded Inserts | View Product |
| A230 | 0.125" [3.17 mm] | 1 µL | 1.02 × 0.80 × 0.64 [25.9 × 20.3 × 16.3] | LED or No LED | SAE or Metric Threaded Inserts | View Product |
| A240 | 0.125" [3.17 mm] | Occlusion + bubble | 1.05 × 0.80 × 0.66 [26.7 × 20.3 × 16.8] | LED or No LED | SAE or Metric Threaded Inserts | View Product |
| A330 | 0.18" [4.76 mm] | 1 µL | 1.07 × 0.80 × 0.68 [27.2 × 20.3 × 17.3] | LED or No LED | SAE or Metric Threaded Inserts | View Product |
 | A430 | 0.25" [6.35 mm] | 10 µL | 1.13 × 0.80 × 0.78 [28.7 × 20.3 × 19.8] | LED or No LED | SAE or Metric Threaded Inserts | View Product |
| A530 | 0.313" [7.94 mm] | 20 µL | 1.18 × 0.80 × 0.85 [30.0 × 20.3 × 21.6] | LED or No LED | SAE or Metric Threaded Inserts | View Product |
| A630 | 0.38" [9.52 mm] | 10 µL | 1.22 × 0.80 × 0.92 [31.0 × 20.3 × 23.4] | LED or No LED | SAE or Metric Threaded Inserts | View Product |
| A830 | 0.50" [12.70 mm] | 50 µL | 1.53 × 0.80 × 1.05 [38.9 × 20.3 × 26.7] | LED or No LED | SAE or Metric Threaded Inserts | View Product |