Cole-Parmer Model 32986-00 Handheld Doppler Ultrasonic Flow Meter
| Brand | Cole-Parmer |
|---|---|
| Origin | USA |
| Model | 32986-00 |
| Liquid Type | Suspensions with particles ≥100 µm or entrained gas bubbles |
| Flow Range | 0.30–16 ft/s (0.1–9 m/s) |
| Accuracy | ±2% of full scale |
| Repeatability | ±1% of full scale |
| Operating Temperature | –20 to 60 °C (–28 to 140 °F) |
| Display | 4-digit LCD, switchable between ft/s and m/s |
| Power Supply | 4 × AA alkaline batteries |
| Dimensions | 102 mm W × 197 mm H × 38 mm D |
| CE Compliant | Yes |
| NIST Traceability | Not certified |
| Sensor Mounting | Clamp-on, non-intrusive |
| Pipe Diameter Range | 25–1524 mm (1–60 in) |
| Transducer Cable Length | 1.83 m (6 ft) |
Overview
The Cole-Parmer Model 32986-00 Handheld Doppler Ultrasonic Flow Meter is a portable, clamp-on instrument engineered for non-invasive volumetric flow measurement in full pipes carrying acoustically reflective liquids. It operates on the Doppler principle: two piezoelectric transducers—mounted externally on the pipe wall—emit and receive ultrasonic signals at a fixed frequency (typically 1–2 MHz). When suspended solids or entrained gas bubbles (≥100 µm) pass through the sound path, they reflect the transmitted wave with a measurable frequency shift (Doppler shift), proportional to the local fluid velocity. By integrating this velocity profile across the pipe cross-section—using pre-programmed pipe geometry and flow profile assumptions—the device calculates real-time volumetric flow rate. Designed for field deployment in challenging industrial environments, it eliminates process shutdowns, pipe cutting, or wetted-part calibration, making it suitable for temporary verification, commissioning support, and routine maintenance checks in water, wastewater, slurry, and mining applications.
Key Features
- Clamp-on, non-intrusive installation—no process interruption, no pressure drop, no risk of leakage or contamination
- Wide pipe compatibility: supports nominal diameters from 1 inch (25 mm) to 60 inches (1524 mm) with standard sensor coupling gel and adjustable mounting strap
- Real-time dual-unit display: selectable between ft/s and m/s on a high-contrast 4-digit LCD screen
- Rugged, handheld enclosure (102 × 197 × 38 mm) with IP65-rated front panel; designed for operation in ambient temperatures from –20 °C to +60 °C
- Battery-powered operation using four AA alkaline cells (included), providing >12 hours of continuous use under typical conditions
- Factory-calibrated transducer assembly with 1.83 m (6 ft) coaxial cable and integrated signal conditioning electronics
- CE-marked per Directive 2014/30/EU (EMC) and 2014/35/EU (LVD); compliant with EN 61326-1 for industrial electromagnetic immunity
Sample Compatibility & Compliance
The Model 32986-00 is validated for use with opaque, heterogeneous liquids containing sufficient acoustic scatterers—such as suspended solids ≥100 µm, microbubbles, or particulate slurries—common in municipal wastewater effluent, dredge pipelines, tailings transport, and construction dewatering systems. It is not suitable for clean, degassed water, low-viscosity hydrocarbons, or gases. The instrument meets CE requirements for electromagnetic compatibility and safety but does not carry NIST-traceable calibration certification. For applications requiring documented metrological traceability, users must perform periodic field verification using a reference meter or velocity profiling method per ISO 10790 or ASTM D7557. No intrinsic safety rating is assigned; use in hazardous areas requires external barrier certification.
Software & Data Management
This is a standalone, embedded-system instrument with no onboard data logging or PC connectivity. All measurements are displayed in real time only; no internal memory, USB port, Bluetooth, or analog output is provided. For documentation purposes, operators must manually record readings or integrate with external data acquisition systems via visual observation. While lacking FDA 21 CFR Part 11-compliant audit trails or electronic signatures, the unit supports GLP/GMP-aligned workflows when used in conjunction with controlled SOPs, operator training records, and manual logbook entries verified by secondary observers.
Applications
- Temporary flow verification during plant upgrades or pump station commissioning
- Slurry flow monitoring in aggregate processing and mineral extraction facilities
- Sanitary sewer and stormwater pipeline assessment without excavation
- Leak detection and balancing studies in multi-branch distribution networks
- Educational demonstrations of ultrasonic flow principles in engineering laboratories
- Field validation of permanent magnetic or Coriolis flow meters where access is limited
FAQ
Can this meter measure flow in stainless steel or lined pipes?
Yes—provided the pipe wall material permits adequate ultrasonic transmission and the lining thickness does not exceed manufacturer-specified limits (e.g., ≤3 mm rubber or epoxy lining). Acoustic impedance mismatch may require manual gain adjustment.
Is calibration required before each use?
No. The instrument is factory calibrated; however, users should verify zero stability and signal strength prior to critical measurements using the built-in self-test function and known static condition checks.
Does it support data export or remote monitoring?
No. The Model 32986-00 is a read-only, analog-display device with no digital interface, memory, or telemetry capability.
What maintenance is recommended?
Clean transducer faces and pipe contact surfaces with isopropyl alcohol before each use; inspect coupling gel integrity and replace if dried or contaminated; store batteries separately during extended non-use to prevent leakage.
Can it be used on partially filled pipes?
No. Doppler ultrasonic flow measurement requires a fully filled, pressurized pipe with consistent liquid column height; open-channel or gravity-fed flows are outside its operational scope.
