Junray ZR-3064 Dual-Circuit Heated Extractive Thermohygrometer
| Brand | Junray |
|---|---|
| Origin | Shandong, China |
| Manufacturer Type | Manufacturer |
| Product Category | Domestic |
| Model | ZR-3064 |
| Instrument Type | General-Purpose Gas Sampler |
| Instrument Configuration | Single-Channel Gas Sampler |
| Flow Range | 0–2.0 L/min |
| Vacuum Pressure | >2.6 kPa |
| Flow Stability | ≤±5% over 1 h |
| Flowmeter Accuracy | ≥±2.5% FS |
| Service Life at Max Flow & Backpressure | ≥5000 h |
| Continuous Operation Duration at Max Flow & Backpressure | 2–8 h with flow variation ≤±5% |
Overview
The Junray ZR-3064 Dual-Circuit Heated Extractive Thermohygrometer is a field-deployable, integrated instrument engineered for real-time, in-situ measurement of temperature and moisture content in condensing flue gas streams—particularly from condensing gas-fired boilers. Unlike conventional humidity analyzers designed for ambient or non-condensing applications, the ZR-3064 addresses the metrological challenge posed by two-phase (gas + liquid droplet) flow conditions in low-temperature exhaust ducts. Its operational principle relies on counter-current heated extraction: a dual-circuit sampling system draws flue gas against the flow direction while maintaining thermal integrity through active heating of the sample path. This prevents condensation within the probe and transport line, enabling stable delivery of representative wet gas to the sensing chamber. Within the heated measurement zone, high-accuracy platinum resistance thermometers (PRTs) and capacitive relative humidity (RH) sensors simultaneously record gas temperature and RH; the onboard microprocessor then computes absolute moisture content (g/m³) using the Magnus–Tetens equation, saturated vapor pressure data per ISO 4677-2, and real-time barometric compensation.
Key Features
- Heated dual-circuit extraction architecture—separates entrained condensate from wet flue gas prior to sensor exposure, minimizing liquid interference and drift.
- Integrated high-brightness, wide-temperature-range color touchscreen interface with intuitive menu navigation and real-time parameter visualization.
- Onboard non-volatile memory (≥4 GB) supporting continuous timestamped logging of up to 10 parameters: flue gas temperature, relative humidity, ambient temperature, absolute moisture content, saturated vapor pressure, static pressure, differential pressure, flow rate, battery voltage, and system status.
- USB host port for direct data export to FAT32-formatted USB flash drives; supports CSV and binary log formats compatible with Excel and MATLAB post-processing.
- Embedded RFID/NFC tag slot compliant with ISO/IEC 15693, enabling traceability integration with laboratory asset management systems (LIMS) and automated calibration tracking workflows.
- Ruggedized aluminum alloy housing rated IP54 for field use in industrial stack environments; operating temperature range: −20 °C to +50 °C.
Sample Compatibility & Compliance
The ZR-3064 is validated for use with flue gases containing water vapor, CO₂, NOₓ, SO₂, and trace hydrocarbons typical of natural gas and propane combustion—provided gas-phase concentrations remain below corrosion thresholds for stainless steel (316L) sampling components. It is not intended for use with highly acidic, abrasive, or particulate-laden streams exceeding 5 mg/m³ without upstream filtration. The instrument complies with key Chinese national standards governing emission monitoring: GB/T 16157–1996 (sampling methodology for particulates and gaseous pollutants), GB/T 11605–2005 (humidity metrology principles), HJ/T 48–1999 (performance requirements for particulate samplers), and NB/T 47066–2018 (test protocols for condensing boiler thermal efficiency). While not certified to EU Measuring Instruments Directive (MID) or US EPA PS-11, its design aligns with fundamental metrological practices referenced in ISO 5167 and ASTM D6216 for extractive sampling integrity.
Software & Data Management
Data acquisition and processing are managed by embedded firmware v3.2.x, supporting configurable sampling intervals (1–60 s), auto-zero calibration prompts, and alarm thresholds for critical parameters (e.g., flow deviation >±5%, heater fault, sensor saturation). All logged datasets include embedded audit trail metadata: operator ID (via optional RFID login), GPS coordinates (when paired with external GNSS module), calibration certificate IDs, and firmware revision hash. Exported files comply with GLP-compliant data integrity requirements—no post-acquisition modification capability exists in the device firmware, and all timestamps are synchronized to UTC via internal RTC backed by supercapacitor. Software updates are delivered via signed firmware packages verified using SHA-256 checksums.
Applications
- Field verification of condensing boiler efficiency per NB/T 47066–2018, where accurate absolute moisture determination directly impacts latent heat recovery calculations.
- Stack testing during commissioning and periodic maintenance of low-NOₓ burners and modulating condensing systems.
- Supporting regulatory reporting under China’s “Blue Sky Protection Campaign” for emissions inventories requiring moisture-normalized pollutant concentrations (e.g., mg/m³ @ 6% O₂, dry basis).
- Research-grade characterization of flue gas thermodynamic state in HVAC and district heating applications involving flue gas heat recovery units (FGHRUs).
- Validation of CFD models simulating two-phase flow behavior in exhaust ducts with non-uniform thermal gradients.
FAQ
Does the ZR-3064 require external power when operating in the field?
Yes—the instrument operates on rechargeable Li-ion battery packs (rated for ≥4 h continuous use at 1.5 L/min), but also accepts 12–24 V DC input via aviation connector for extended deployments.
Can it be used for non-condensing flue gas applications?
Yes—its heated sampling path remains functional at lower moisture levels; however, the algorithmic correction for condensation effects is disabled automatically when dew point depression exceeds 15 °C.
Is flow calibration traceable to national standards?
Each unit ships with a factory calibration certificate referencing NIM (National Institute of Metrology, China) traceable flow standards; field recalibration is supported using certified rotameters or primary sonic nozzles.
What maintenance intervals are recommended?
Sensor cleaning every 200 operating hours; full system verification (flow, temperature, RH) every 12 months or after 1000 h of cumulative runtime—whichever occurs first.
Does the device support Modbus RTU or other industrial communication protocols?
No—data exchange is limited to USB mass storage mode and optional Bluetooth 5.0 (firmware v3.3+); RS-485 or Ethernet interfaces are not available in current hardware revision.
