TSI Model 4046 Portable Thermal Mass Flow Calibrator
| Brand | TSI |
|---|---|
| Origin | USA |
| Model | 4046 |
| Flow Range | 2.5–300 L/min |
| Accuracy | ±2% of reading or ±0.05 STD L/min (whichever is greater) |
| Display | Real-time volumetric flow (temperature- and pressure-compensated) |
| Response Time | 4 ms |
| Dimensions | 183 × 64 × 53 mm |
| Weight | 0.5 kg |
| Power | 7.5 VDC ±1.5 V, peak current 300 mA |
| Warm-up Time | 1 min |
| Calibration | NIST-traceable certificate included |
| Compliance | NIOSH-approved primary calibration reference instrument |
Overview
The TSI Model 4046 Portable Thermal Mass Flow Calibrator is an NIST-traceable, battery-powered instrument engineered for high-fidelity calibration and verification of active air sampling pumps used in occupational hygiene, environmental monitoring, and industrial hygiene applications. It operates on the principle of thermal mass flow measurement—utilizing constant-temperature anemometry to quantify gas mass flow rate, then applying real-time temperature and barometric pressure compensation to report volumetric flow under standard conditions (STD L/min at 25 °C and 101.325 kPa). Its 4 ms dynamic response enables accurate characterization of transient or pulsating flows typical of diaphragm-based personal sampling pumps. Designed for field-deployable metrology, the Model 4046 meets the stringent performance requirements defined in NIOSH Manual of Analytical Methods (NMAM) Chapter 2.1 and serves as a primary reference standard per NIOSH criteria for flow calibration instrumentation.
Key Features
- Real-time, continuously updated volumetric flow display with automatic temperature and pressure compensation—enabling immediate pump adjustment during calibration procedures
- High-speed thermal sensor architecture with 4 ms response time, minimizing error during dynamic flow events such as pump startup, valve switching, or pressure fluctuations
- Battery-operated design (7.5 VDC, internal rechargeable or replaceable cells) supporting full-day field operation without external power sources
- Compact form factor (183 × 64 × 53 mm) and lightweight construction (0.5 kg) optimized for handheld use and integration into mobile hygiene survey kits
- NIST-traceable calibration certificate supplied with each unit, documenting as-delivered accuracy against national standards
- NIOSH-recognized as a Primary Calibration Reference Instrument—validated for compliance with NMAM 2.1, OSHA ID-121, and ISO 8502-2 for occupational aerosol sampling systems
Sample Compatibility & Compliance
The Model 4046 is compatible with all common active air sampling devices—including diaphragm, piston, and rotary vane pumps—used with filter cassettes, sorbent tubes, impingers, and direct-reading aerosol monitors. It supports calibration across its full range (2.5–300 L/min) for both low-flow personal sampling (e.g., 1–5 L/min for respirable dust) and high-flow area monitoring (e.g., 100–300 L/min for total dust or VOC sampling). The instrument conforms to ISO/IEC 17025 requirements for calibration laboratories when used within documented uncertainty budgets. Its accuracy specification—±2% of reading or ±0.05 STD L/min, whichever is greater—is validated per ASTM D6196 and aligns with GLP-compliant documentation practices required for regulatory submissions to OSHA, MSHA, and EU-OSHA frameworks.
Software & Data Management
While the Model 4046 operates as a standalone analog/digital calibrator with no embedded data logging, it integrates seamlessly into laboratory and field QA/QC workflows via manual recording or optional third-party DAQ systems. All units ship with a NIST-traceable calibration certificate specifying measurement uncertainty at multiple points across the flow range (typically 5, 30, 100, and 250 L/min), traceable to NIST Standard Reference Materials (SRMs) and certified by an ISO/IEC 17025-accredited calibration lab. For audit readiness, users may document calibration events using TSI’s recommended log templates—designed to satisfy FDA 21 CFR Part 11 electronic record requirements when paired with secure, time-stamped entry protocols.
Applications
- Pre- and post-sampling calibration of personal air sampling pumps in accordance with NIOSH and OSHA field protocols
- Periodic verification of flow stability during extended sampling campaigns (e.g., 8-hour TWA assessments)
- Validation of flow control systems in laboratory fume hoods, cleanrooms, and inhalation toxicology exposure chambers
- Supporting method validation studies for ISO 16000-7 (indoor air VOC sampling) and EN 13205 (workplace aerosol measurement)
- Field service and maintenance of fixed-site ambient air quality monitors requiring traceable flow verification
FAQ
Is the Model 4046 suitable for calibrating pumps used with conductive or corrosive gases?
Yes—provided the sampled gas is non-condensing, non-corrosive to stainless steel 316 and fused silica flow elements. For aggressive media (e.g., chlorine, hydrogen sulfide), consult TSI Application Engineering for compatibility assessment.
Does the instrument require annual recalibration?
TSI recommends recalibration every 12 months or after 200 hours of operational use—whichever occurs first—to maintain stated accuracy and NIST traceability.
Can the Model 4046 be used at high altitudes or extreme temperatures?
It automatically compensates for ambient temperature (0–50 °C) and pressure (60–110 kPa), enabling reliable operation up to 4,000 m elevation. For sustained use below 0 °C or above 50 °C, thermal stabilization per TSI Technical Note TN-4046-01 is advised.
What does “STD L/min” mean in the accuracy specification?
STD L/min denotes liters per minute referenced to standard conditions: 25 °C and 101.325 kPa (1 atm), enabling consistent comparison across varying ambient environments—a requirement specified in ISO 8502-2 and USP .
