Graywolf PIT-504-KIT Pitot Tube Air Velocity and Flow Measurement Kit

Overview

The Graywolf PIT-504-KIT is a high-temperature, telescoping pitot tube system engineered for precision air velocity and volumetric flow measurement in industrial ventilation ducts, HVAC systems, combustion exhaust stacks, and cleanroom airflow validation. Based on the fundamental principle of differential pressure measurement—where total pressure (stagnation pressure) and static pressure are sensed simultaneously—the PIT-504-KIT delivers traceable, ISO/IEC 17025-aligned velocity data when paired with a calibrated Graywolf differential pressure meter (e.g., DP-CALC™ or AirSpectra™ series). Its 4-segment telescoping architecture enables reliable access to deep duct sections without compromising structural rigidity or pressure signal integrity. Unlike fixed-length probes, this modular design maintains consistent K-factor calibration across all extended configurations, ensuring metrological continuity per ASTM D2593 and ISO 10780 standards for duct traverse measurements.

Key Features

• Telescoping 4-segment stainless steel construction (316 SS), extendable from 140 cm to 205 cm, with positive-locking joints and integrated alignment guide for repeatable insertion depth control
• High-temperature rated sensing ports: continuous operation up to 680 °C, short-term exposure tolerance to 800 °C—validated per ASTM E230 for thermocouple-grade material compliance
• Factory-calibrated K-factor (0.995 ± 0.003) traceable to NIST-traceable wind tunnel testing at multiple Reynolds numbers (Re = 1×10⁴ to 2×10⁵)
• Integrated dual-port configuration: aligned total-pressure and static-pressure orifices conforming to ISO 3966 Annex A geometry specifications
• Low-profile tip geometry minimizes flow disturbance and turbulence-induced measurement hysteresis, especially critical in low-velocity (<2 m/s) and high-turbulence environments
• Compatible with Graywolf’s DP-CALC™ Series differential pressure meters featuring automatic density correction, real-time mass flow computation, and built-in duct geometry libraries (circular, rectangular, oval)

Sample Compatibility & Compliance

The PIT-504-KIT is validated for use in non-corrosive, particulate-limited airstreams typical of HVAC commissioning, stack emission monitoring (per EPA Method 2), and cleanroom ISO 14644-3 certification. It complies with key regulatory frameworks governing airflow instrumentation: ASTM D2593 (Standard Test Method for Airflow Rate in Ducts), ISO 10780 (Determination of velocity and volume flow rate of gases in ducts), and EN 15251 (Indoor environmental input parameters). For GxP-regulated environments—including pharmaceutical HVAC qualification—the probe supports 21 CFR Part 11-compliant data capture when used with Graywolf’s AirSpectra™ software suite, including audit trail generation, electronic signature support, and user-access-controlled calibration history logging.

Software & Data Management

When interfaced with Graywolf’s AirSpectra™ v4.2+ software (Windows-based), the PIT-504-KIT enables automated traverse point mapping, real-time velocity profile visualization, and ASHRAE 111-compliant multi-point averaging. The software applies dynamic air density compensation using simultaneous temperature, barometric pressure, and humidity inputs—critical for accurate volumetric-to-mass flow conversion. All raw differential pressure values, computed velocities, and derived flow rates are timestamped and stored in encrypted .csv and .xml formats compliant with GLP/GMP documentation requirements. Calibration certificates—including uncertainty budgets (k=2) and drift analysis over 12-month intervals—are embedded directly into instrument metadata.

Applications

• HVAC system balancing and TAB (Testing, Adjusting, and Balancing) per ANSI/ASHRAE Guideline 12
• Exhaust stack velocity profiling for EPA Method 2 and 5 compliance reporting
• Combustion air intake verification in boiler and furnace applications
• Cleanroom airflow uniformity assessment per ISO 14644-3 Annex B
• Industrial dryer and kiln airflow characterization under elevated-temperature conditions
• Validation of laminar flow hoods and biosafety cabinets per NSF/ANSI 49

FAQ

What is the recommended calibration interval for the PIT-504-KIT?
Graywolf recommends annual recalibration against a NIST-traceable reference standard; however, in continuous high-temperature service (>500 °C), semi-annual verification is advised.
Can the PIT-504-KIT be used in wet or corrosive gas streams?
No—this probe is designed for dry, non-aggressive airstreams. For corrosive or high-humidity applications, consult Graywolf’s chemically resistant pitot variants (e.g., Hastelloy C-276-lined PIT-700 series).
Does the telescoping mechanism affect measurement accuracy?
No—the joint design preserves internal bore continuity and port alignment per ISO 3966; K-factor stability has been verified across all extension lengths via wind tunnel testing.
Is the probe compatible with third-party differential pressure meters?
Yes—provided the external meter offers ≥0.1 Pa resolution, <1% linearity error, and supports analog voltage or digital RS-232 output; however, full feature integration (e.g., auto-density correction) requires Graywolf host instrumentation.