FPI DS7000 Series Digital Particulate Concentration Monitor

Overview

The FPI DS7000 Series Digital Particulate Concentration Monitor is an industrial-grade, explosion-proof in-situ monitoring instrument engineered for continuous, real-time measurement of particulate mass concentration in process gas streams. Unlike optical or beta-attenuation methods, the DS7000 employs electrostatic induction sensing—a physical principle grounded in triboelectric and capacitive coupling effects—where charged particles traversing a defined sensing zone induce transient current fluctuations on a high-impedance electrode array. These microampere-level charge signals are captured via low-noise analog front-end circuitry and subjected to adaptive digital signal processing (DSP), including bandpass filtering, statistical noise suppression, and fluid-dynamic modeling algorithms. The result is a robust, drift-free output proportional to particulate mass loading (mg/m³ or g/Nm³), independent of particle optical properties, refractive index, or size distribution assumptions. Designed for integration into hazardous-area process environments, the DS7000 operates without optical windows, purge systems, or radioactive sources—eliminating routine calibration drift and maintenance downtime.

Key Features

• Explosion-proof certified housing (ATEX II 2G Ex db IIB T4 Gb / NEC Class I, Div 1, Groups C/D), suitable for Zone 1/Div 1 classified locations
• Electrostatic induction sensing core—immune to electromagnetic interference from ESPs, VFDs, and high-voltage equipment
• Self-diagnostic probe contamination detection: real-time impedance monitoring and signal-to-noise ratio (SNR) trending with automated alerting
• No zero drift or span drift over extended operation; no periodic zero/span calibration required under stable process conditions
• Modular probe design with optional high-temperature (up to 400 °C), corrosion-resistant (Hastelloy C-276, Inconel 625), and abrasion-hardened ceramic coatings
• Dual-channel analog output (4–20 mA isolated) + RS-485 Modbus RTU interface for PLC/DCS integration

Sample Compatibility & Compliance

The DS7000 is validated for use in dry or moderately humid gas matrices containing solid particulates—including fly ash, catalyst fines, metal oxides, polymer dust, and mineral powders—with typical particle size ranges spanning 0.5 µm to 500 µm. It is not intended for aerosols dominated by submicron condensables (e.g., sulfuric acid mist) or liquid droplets. Compliance includes adherence to IEC 61508 SIL 2 functional safety requirements for critical emission monitoring loops, full traceability per ISO/IEC 17025 calibration protocols (via accredited third-party labs), and compatibility with EPA Method 9 and ISO 9096-based reporting frameworks when deployed as part of a certified Continuous Emission Monitoring System (CEMS). All firmware and configuration data meet audit-trail requirements under GLP and GMP-aligned operational procedures.

Software & Data Management

The DS7000 integrates with FPI’s proprietary FPI-Monitor Suite v3.2—a Windows-based engineering software platform supporting device configuration, real-time waveform visualization, spectral analysis, and historical trend export (CSV/Excel). Raw time-series charge data (1 kHz sampling) is timestamped and stored onboard (8 GB internal flash) for up to 30 days at 1-second resolution. Remote diagnostics, firmware updates, and alarm log retrieval are enabled via secure TLS 1.2 HTTPS API endpoints. For enterprise deployment, the unit supports OPC UA server functionality (compliant with IEC 62541), enabling seamless ingestion into PI System, Ignition SCADA, or cloud-based IIoT platforms such as Azure IoT Hub or AWS IoT Core—fully compliant with FDA 21 CFR Part 11 electronic record and signature requirements when configured with user role-based access control and audit logging.

Applications

The DS7000 series serves as a primary or backup particulate monitor in demanding industrial processes where reliability, intrinsic safety, and long-term stability are non-negotiable. Key deployment scenarios include: continuous catalyst concentration monitoring in FCC regenerator off-gas lines; real-time fly ash loading assessment upstream of ESPs in coal-fired boiler ducts; fugitive dust tracking in pneumatic conveying systems handling sodium hydroxide or chlorine intermediates; and particulate burden verification in syngas cleaning trains for coal gasification and ammonia synthesis plants. Its immunity to ESP field distortion makes it uniquely suited for post-ESP stack compliance verification where optical monitors frequently fail due to residual ionization artifacts.

FAQ

Does the DS7000 require periodic calibration with reference dust standards?
No—electrostatic induction sensing is inherently self-referencing. While initial site-specific sensitivity characterization is recommended using representative process dust, no routine recalibration is mandated per IEC 62063 or EN 15267-3.
Can the DS7000 operate in wet or condensing gas streams?
It is rated for relative humidity ≤90% non-condensing. Optional heated probe variants (with integrated PID-controlled thermal management) support saturated gas applications up to dew points of 80 °C.
Is the output traceable to national metrology institutes?
Yes—FPI provides NIST-traceable calibration certificates issued by CNAS-accredited laboratories, with uncertainty budgets reported per ISO/IEC 17025 Annex A.
What diagnostic data is available via Modbus RTU?
Register-mapped outputs include instantaneous concentration, SNR index, probe temperature, electrode impedance, internal ambient temperature/humidity, and 10-event alarm history with timestamps.
How is intrinsically safe installation achieved in Class I, Div 1 areas?
The DS7000 uses a flameproof (Ex d) enclosure design—not intrinsic safety (Ex i)—and must be installed with approved conduit seals and grounding per NEC Article 501 and IEC 60079-14.