Junray ZR-D13E Capacitive-Resistive Flue Gas Moisture Analyzer

Overview

The Junray ZR-D13E Capacitive-Resistive Flue Gas Moisture Analyzer is an industrial-grade in-situ and extractive measurement instrument engineered for continuous, real-time determination of water vapor concentration in hot, corrosive, and particulate-laden flue gas streams. It operates on the capacitive-resistive (CR) sensing principle—where changes in the dielectric constant and electrical conductivity of a hygroscopic polymer film are correlated to ambient relative humidity and temperature—enabling direct volumetric moisture quantification (vol%) under dynamic process conditions. Unlike chilled-mirror or tunable diode laser (TDLAS) systems, the ZR-D13E employs a robust, field-proven CR transducer optimized for high-temperature exhaust environments up to 180 °C (with optional cooling sleeve), making it especially suitable for post-desulfurization (FGD), coal-fired boiler, and catalytic cracking unit applications where condensation risk and sensor fouling are critical concerns.

Key Features

• Capacitive-resistive dual-mode sensing architecture with imported polymer-based humidity transducer, delivering stable calibration traceability and low hysteresis across 0–40 vol% moisture range
• Extractive sampling design with patented probe protection system—including ceramic-coated 316 stainless steel housing, electrostatic discharge (ESD)-resistant surface treatment, and integrated dust filtration—ensuring operational integrity in high-dust (>5 g/m³), high-acid (SO₂, HCl > 1000 ppm), and high-humidity (>95% RH) environments
• Modular probe assembly with standard 1-meter insertion length (custom lengths available); compatible with both fixed-mount and portable deployment configurations
• Dual-input human-machine interface: 5-inch color TFT touchscreen + tactile membrane keypad for redundancy in gloved or high-noise operational settings
• Integrated rechargeable lithium-ion battery (≥8 h runtime), enabling offline data logging, on-site verification, and Bluetooth thermal printing without external power
• Ruggedized monolithic enclosure with IP65-rated ingress protection, designed for long-term installation in outdoor stack platforms or control room cabinets

Sample Compatibility & Compliance

The ZR-D13E is validated for use with flue gases containing SO₂, NOₓ, CO, CO₂, HCl, HF, and fine particulates (PM₁₀/PM₂.₅), with no cross-sensitivity to common combustion byproducts. Its measurement methodology aligns with national and international reference standards including HJ 836–2017 (Determination of Low-Concentration Particulate Matter in Stationary Source Exhaust—Gravimetric Method), GB/T 11605–2005 (Methods for Humidity Measurement), and JJF 1272–2011 (Calibration Specification for Capacitive-Resistive Dew Point Hygrometers). While not certified to IEC 61508 or SIL-2, the analyzer meets functional safety requirements for non-safety-critical environmental monitoring per ISO 14001 and EPA Method 4 compliance frameworks. Data integrity supports GLP-aligned recordkeeping via timestamped audit trails and user-accessible calibration logs.

Software & Data Management

Onboard firmware supports internal storage of ≥10,000 measurement records with UTC timestamps, flow velocity, temperature, and moisture concentration. Data export is enabled via USB 2.0 mass storage mode (CSV format), RS485 Modbus RTU protocol (addressable as slave device in SCADA networks), and optional Bluetooth 4.2 LE for wireless transmission to Android/iOS companion apps. The embedded software implements automatic zero-drift compensation during idle cycles and configurable alarm thresholds (e.g., moisture >35 vol% triggers visual/audio alert). All configuration parameters—including sampling interval (1–60 s), unit selection (vol%, g/m³, °C dew point), and calibration offset—are retained through power cycles without volatile memory dependency.

Applications

• Continuous emission monitoring (CEMS) integration for wet FGD outlet ducts and scrubber bypass lines
• Combustion efficiency optimization in coal-, biomass-, and waste-to-energy boilers
• Process moisture validation in petrochemical FCC units, sulfur recovery plants, and coke oven gas treatment systems
• Regulatory compliance verification for HJ 836–2017 low-concentration PM testing—where accurate dilution air humidity correction is mandatory
• In-line humidity profiling in tobacco leaf drying tunnels, industrial ovens, and environmental test chambers
• Field verification and QA/QC support for handheld or fixed-stack analyzers requiring traceable secondary reference

FAQ

What is the operating temperature limit of the probe?
The standard probe is rated for continuous operation at ≤180 °C; optional air-cooled or water-jacketed extensions extend suitability to 300 °C flue gas environments.
Does the ZR-D13E require periodic recalibration?
Yes—annual calibration against NIST-traceable saturated salt solutions or certified humidity generators is recommended per JJF 1272–2011; field zero-check using dry nitrogen is supported via menu-driven procedure.
Can the instrument measure dew point directly?
No—it outputs volumetric moisture (vol%) and temperature; dew point must be calculated externally using industry-standard Magnus or Arden-Buck equations.
Is the RS485 interface compatible with Modbus TCP gateways?
The native interface is Modbus RTU over RS485; conversion to Modbus TCP requires an external protocol converter meeting IEEE 802.3 compliance.
How is sensor contamination mitigated during high-dust operation?
The probe features a replaceable sintered stainless steel filter (5 µm pore size) upstream of the sensing element, plus programmable auto-purge intervals triggered by differential pressure monitoring.