Baseline piD-TECH® eVx™ PID Sensor (Red Model 045-012)

Overview

The Baseline piD-TECH® eVx™ PID Sensor (Red Model 045-012) is a high-performance, intrinsically safe photoionization detector engineered for precise, real-time quantification of volatile organic compounds (VOCs) in ambient air and industrial process streams. Utilizing vacuum ultraviolet (VUV) lamp technology at 10.6 eV photon energy, the sensor ionizes VOC molecules with ionization potentials below this threshold—enabling selective detection of aromatic hydrocarbons, ketones, aldehydes, amines, and many chlorinated solvents while excluding common interferents such as methane, CO₂, and water vapor. Designed for seamless integration into OEM gas detection platforms—including portable monitors, fixed-point controllers, and continuous emission monitoring systems (CEMS)—the eVx™ platform maintains mechanical and electrical compatibility with Baseline’s established 4-Series electrochemical sensor form factor, simplifying hardware redesign and accelerating time-to-market.

Key Features

• Intrinsically safe architecture certified to UL 913, CAN/CSA C22.2 No. 152, ATEX II 2G Ex ia IIC T4 Ga, and IECEx Ex ia IIC T4 Ga—validated for use in Class I, Division 1 hazardous locations.
• Dual-stage particulate filtration system minimizes sensor fouling from dust, oil mist, and aerosols, extending maintenance intervals and sustaining baseline integrity over extended deployments.
• Patented lamp restart circuit ensures consistent, repeatable lamp ignition under variable temperature and power conditions—critical for field reliability in battery-powered or low-voltage applications.
• Long-life VUV lamp (>12,000 operating hours) with stable photon output, reducing calibration drift and total cost of ownership across multi-year instrument lifecycles.
• Integrated electrode-based humidity compensation actively suppresses signal interference from ambient moisture—eliminating the need for external desiccant cartridges or complex software correction algorithms.
• Internal linear voltage regulation delivers exceptional signal stability across input voltage fluctuations (6–24 VDC), supporting both 12 V nominal battery systems and 24 V industrial loop-powered configurations.
• Thermally robust design with negligible temperature coefficient (<±0.05% FS/°C) and rapid thermal equilibration enables accurate operation from –20 °C to +50 °C without active heating or cooling.
• T90 response time of less than 2 seconds (typical) supports dynamic leak detection, fugitive emission surveys, and real-time process control applications requiring sub-second feedback.

Sample Compatibility & Compliance

The eVx™ sensor demonstrates broad compatibility with over 200 VOCs listed in EPA Method TO-17 and ASTM D5504, including benzene, toluene, xylene (BTX), styrene, acetone, isopropanol, formaldehyde (with derivatization), and trichloroethylene. It is not responsive to permanent gases (e.g., N₂, O₂, CO), saturated aliphatics below C₃ (e.g., propane, butane), or highly polar compounds with IP > 10.6 eV (e.g., methanol, formic acid). All units comply with IEC 60079-0, IEC 60079-11, and EN 61000-6-2/6-3 for electromagnetic compatibility and intrinsic safety. The sensor meets requirements for GLP-compliant environmental monitoring when integrated into validated instrumentation platforms.

Software & Data Management

While the eVx™ is an analog-output sensor (0–5 V or 4–20 mA configurable), its linear response curve and low noise floor (<10 µV RMS) enable high-fidelity digitization at 16-bit resolution or higher. When paired with Baseline’s reference evaluation boards or third-party DAQ systems compliant with FDA 21 CFR Part 11, full audit trails—including calibration history, sensor diagnostics, and environmental metadata—can be maintained. Firmware-level diagnostics (lamp status, filter saturation flag, temperature log) are accessible via optional I²C interface modules, supporting predictive maintenance protocols in regulated environments.

Applications

• Industrial hygiene monitoring for workplace exposure assessment per OSHA PELs and ACGIH TLVs.
• Fugitive emission detection (FED) during LDAR (Leak Detection and Repair) programs compliant with EPA 40 CFR Part 60 and 63.
• Soil vapor intrusion (SVI) screening and remediation verification at brownfield sites.
• Indoor air quality (IAQ) assessment in commercial buildings, schools, and healthcare facilities.
• OEM integration into handheld PID analyzers, drone-mounted survey systems, and distributed fixed-site networks for perimeter monitoring.
• Process safety interlocks in chemical manufacturing, pharmaceutical cleanrooms, and semiconductor fab exhaust streams.

FAQ

What VOCs can the eVx™ 045-012 detect?
It detects VOCs with ionization potentials ≤10.6 eV—including aromatics, olefins, sulfur compounds, and many halogenated solvents—but excludes methane, ethane, CO₂, and highly polar species like methanol.
Is field calibration required?
Yes; recommended quarterly using certified isobutylene or benzene standard gas at 100 ppm. Built-in zero and span adjustment points support manual or automated calibration routines.
Can it operate in high-humidity environments?
Yes; the integrated electrode-based humidity suppression provides stable readings up to 95% RH non-condensing without signal attenuation.
What is the expected service life under continuous operation?
With proper filtration and routine zero checks, operational lifespan exceeds 3 years at 24/7 duty cycle; lamp replacement is the primary consumable.
Does it support digital communication protocols?
The base model offers analog output only; optional I²C-enabled variants (eVx-DIG) provide digital diagnostics and configuration via SMBus-compatible interfaces.