The Foxboro (Thermo Scientific) TVA-1000B is a portable, intrinsically safe toxic vapor analyzer widely used for environmental monitoring and leak detection. It is unique for its ability to utilize both Flame Ionization Detection (FID) and Photo-Ionization Detection (PID), either simultaneously or individually, within a single handheld unit.
While this model has been largely discontinued and replaced by newer units like the TVA-2020, it remains in use in many industrial settings due to its proven reliability.
Key Features & Capabilities
- Dual-Detector Technology:
- FID (Flame Ionization Detector): Operates by breaking carbon-hydrogen bonds. It is highly effective for measuring hydrocarbons over a wide range (up to 50,000 ppm methane) and is not limited by a molecule’s ionization potential.
- PID (Photo-Ionization Detector): Useful for detecting both organic and inorganic compounds (such as ammonia or hydrogen sulfide) that the FID might miss. It does not require fuel gas.
- Applications:
- Fugitive emissions monitoring (LDAR programs).
- Emergency response to hazardous chemical spills.
- Underground storage tank (UST) leak detection.
- Industrial hygiene and ambient air quality surveys.
- Portability: Weighs approximately 13 lbs (5.8 kg) and is designed as an “over-the-shoulder” unit with an 8-hour battery life.
- Compliance: Rated intrinsically safe for Class I, Division 1, Groups A, B, C, and D environments (Temp Class T4).
Operational Basics
- FID Fuel: Requires high-purity (99.995%) hydrogen gas. The system includes a hydrogen storage tank that must be handled as dangerous goods (UN 1049) during transport.
- Warm-up: For accurate calibration and operation, the unit should warm up for approximately 30 minutes with the pump on, PID lamp on, and FID ignited.
- Calibration: Supports multi-point calibration and multiple response factors/curves. It is recommended to perform routine calibrations to maintain accuracy, especially for regulatory compliance tasks.
Maintenance & Support
- Discontinued Status: As the unit is discontinued, finding brand-new factory units is rare. Most support now focuses on calibration services, flat-rate repairs, and the procurement of legacy spare parts.
- Repair Services: Several specialized environmental equipment companies offer diagnostics, sensor replacement, airflow optimization, and battery service for the TVA-1000B.
- Software: Data can be managed via the ThermoConnect software to transfer logs and configure instrument settings.
