Precision Ultrasonic Flow Monitoring in Semiconductor Manufacturing: Selecting Between Clamp-On, Inline, and Micro-Flow Architectures

In semiconductor wafer fabrication, chemical mechanical planarization (CMP), wet bench etching, and high-density liquid cooling, fluid flow monitoring is directly tied to yield rates and operational stability. However, process media range from hyper-aggressive acids and slurries to micro-doses of expensive chemical additives.

Ultrasonic Flow Monitoring in Semiconductor Manufacturing:
Selecting Between Clamp-On, Inline,
and Micro-Flow Architectures

To meet these specialized constraints without introducing mechanical wear or cross-contamination, R&B Instrument Inc. offers a versatile suite of ultrasonic transit-time flow sensors tailored to specific field conditions.


1. RBCS Clamp-On Series: Eliminating Contamination and Leakage Risks

  • For ultra-pure chemical delivery and wafer cleaning lines constructed from high-purity plastics (such as PFA and PTFE), cutting pipes is unacceptable.
  • Non-Invasive Architecture: The RBCS Series clamps directly onto the tube wall. Ultrasonic sound waves penetrate the plastic barrier to track velocity without touching the process fluid.
  • Zero Pressure Drop & Risk: Completely eliminates fluid contamination, chemical leaks, and hydraulic pressure loss.
  • Scaling Range: Models (from RBCS025NS to RBCS060MS) cover outer pipe dimensions from 1/4 ′′  up to 60.3mm, handling flow envelopes from 0–5L/min up to 0–400L/min.


2. RBTPD / RBTPK Inline Series: Unobstructed Bore for Slurries and Coolants

  • When piping architecture permits inline installation, internal moving components can cause clogging and pressure drop.
  • Straight-Through Flow Path: The RBTPD (with integrated 1.3" OLED display) and RBTPK (OEM integration footprint) feature smooth internal PPS channels with zero internal moving elements or seals.
  • High Repeatability: Delivers an exceptional repeatability of ±0.1% F.S., handling media temperatures from 0 to 70∘ C with multi-protocol outputs (RS485, pulse, current, frequency). Available in G-thread and quick-clamp configurations up to 100L/min.


3. RBTAD & RBTGU Series: All-Stainless Robustness and Ultra-Low Flow Precision

  • RBTAD All-Stainless Series: Constructed with a rugged, all-stainless-steel body and sanitary tri-clamp fittings. Built for high structural strength, liquid cooling circuits, and sanitary washdown environments.
  • RBTGU Micro-Flow Series: Utilizes a specialized U-shaped flow channel housed in high-purity PEEK. Dedicated to ultra-low chemical dosing, it accurately measures flows down to 1mL/min with a resolution of ±0.05mL/min.

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