Tianhong TH-J2 Digital Pressure Calibrator

Overview

The Tianhong TH-J2 Digital Pressure Calibrator is a field-deployable, dual-function metrological instrument engineered for high-reproducibility calibration of pressure and volumetric flow parameters in flue gas and particulate sampling systems. It operates on the principle of controlled pressure generation via an integrated electronic pressure pump and an externally connected motorized micro-pressure generator—enabling precise, stepwise pressure application across low-range pneumatic circuits (typically 0–10 kPa, optimized for stack sampling applications). Flow calibration is executed using a dry-type cumulative flowmeter coupled with a photoelectric sensor array, which captures real-time pulse signals to compute instantaneous flow rate, time-integrated average flow, and standardized volumetric flow (Q_std) corrected to 273.15 K and 101.325 kPa per ISO 5167 and EPA Method 5B conventions. Designed in strict adherence to Chinese national verification regulations JJG 875–2005 and JJG 577–2005, the TH-J2 serves as a traceable reference standard for environmental monitoring agencies conducting stack testing, emission source characterization, and method validation under GB/T 16157 and HJ/T 48–1999.

Key Features

• High-resolution 320 × 240 graphical LCD with multilingual (English/Chinese) menu navigation and simultaneous display of pressure, flow, ambient temperature, barometric pressure, timestamp, and pass/fail status.
• Dual-mode pressure generation: internal electronic pump for rapid coarse adjustment + external motorized micro-pressure generator for fine-tuned, low-drift pressure control—ideal for calibrating low-differential-pressure sensors used in isokinetic sampling probes.
• Automated flow calibration sequence: auto-starts timing upon flow initiation, computes real-time instantaneous flow, integrates over user-defined duration, applies standard condition correction (temperature and pressure compensation), and outputs Q_std in L/min or m³/h.
• Onboard statistical engine: calculates absolute and relative error at each of up to seven user-defined calibration points; identifies maximum permissible error (MPE) per selected standard; issues automatic compliance verdict (Pass/Fail) aligned with JJG 577–2005 tolerance bands.
• Integrated environmental sensing: factory-calibrated digital barometer and RTD-based temperature sensor eliminate need for external meteorological instruments during field audits.
• Secure firmware-level calibration: pressure and flow transducer coefficients adjustable via numeric keypad with dual-level password protection (operator vs. metrologist access).
• Battery-backed real-time clock (RTC) ensures ISO/IEC 17025-compliant audit trails—each stored record includes full metadata: calibration point index, standard value, UUT reading, computed error, ambient conditions, operator ID (if configured), and UTC timestamp.

Sample Compatibility & Compliance

The TH-J2 is validated for use with common flue gas sampling platforms including but not limited to: DUSTTRAK™ II aerosol monitors, Testo 350 series emission analyzers, Thermo Fisher pDR-series particulate samplers, and domestically deployed TH series isokinetic samplers. Its pressure output range (0–10 kPa) and flow calibration capability (1–60 L/min) align with requirements specified in HJ/T 48–1999 (Technical Specification for Particulate Matter Sampling from Stationary Sources) and EPA Reference Method 5. All internal transducers are traceably calibrated against NIM (National Institute of Metrology, China)–accredited standards. The device supports GLP-aligned data integrity through non-volatile memory storage, immutable record structure, and optional export to CSV via USB interface—facilitating integration into LIMS environments compliant with CNAS-CL01:2018 and ISO/IEC 17025:2017.

Software & Data Management

Data acquisition and reporting are fully automated. Each calibration session generates a self-contained dataset containing: standard pressure/flow values, unit under test (UUT) readings, absolute and percent-of-full-scale errors, MPE threshold, pass/fail determination, ambient temperature (°C), barometric pressure (kPa), date/time stamp, and record serial number. Up to 1,000 complete calibration sets may be stored internally. USB mass-storage mode enables direct file transfer to Windows/Linux workstations without proprietary software. Exported CSV files conform to ASTM E1447–22 formatting guidelines for metrological records, enabling seamless import into Excel, LabVIEW, or ELN systems. Audit log entries—including calibration parameter changes and password-authenticated access events—are retained separately and cannot be edited or deleted.

Applications

• Field verification and periodic recalibration of pitot tubes, differential pressure transmitters, and vacuum regulators in EPA Method 5 and ISO 9096 particulate sampling trains.
• Verification of flow controllers and rotameters used in continuous emission monitoring systems (CEMS) for SO₂, NOₓ, and CO.
• Supporting QA/QC protocols for ambient air quality monitoring networks requiring traceable pressure and flow references per HJ 653–2013.
• Calibration support for laboratory-based filter weighing balances where static pressure stability affects gravimetric accuracy.
• Educational use in environmental engineering labs for teaching fundamental principles of fluid dynamics, pressure metrology, and regulatory compliance workflows.

FAQ

Does the TH-J2 meet international metrological standards such as ISO/IEC 17025?
It complies with national verification regulations JJG 875–2005 and JJG 577–2005, and its design supports implementation of ISO/IEC 17025:2017 Clause 6.4 (Equipment) and Clause 7.7 (Ensuring Validity of Results) when operated within defined environmental and procedural constraints.
Can calibration certificates be issued directly from the instrument?
No—the TH-J2 stores raw and processed data but does not generate formal calibration certificates. Users must export data and compile reports using accredited software or third-party metrology service providers.
Is firmware upgrade supported in the field?
Yes—firmware updates are delivered via USB stick and applied through the system maintenance menu under administrator password authentication.
What is the recommended recalibration interval?
Annual recalibration against national primary standards is advised, or after 500 operating hours—whichever occurs first—as stipulated in Q/WTH42–2013 Section 8.2.
Does the device support Modbus or other industrial communication protocols?
No—it operates as a standalone calibration tool with no embedded serial or network communication interfaces beyond USB mass-storage mode.