Hengao De CFZ15 Portable Intrinsically Safe Negative-Pressure Gas Sampler
| Brand | Hengao De |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | CFZ15 |
| Price | USD 28.50 (FOB) |
| Sampling Flow Rate | 15 L/min ±5 L/min |
| Maximum Vacuum | -90 kPa |
| Continuous Operation Time | ≤150 min |
| Battery Voltage | 8.4 V DC |
| Dimensions | 215 × 130 × 80 mm |
| Weight | 1.8 kg |
| Operating Temperature | 0–40 °C |
| Relative Humidity | ≤95% RH at 25 °C |
| Atmospheric Pressure Range | 80–106 kPa |
| Explosion Protection | Suitable for Methane & Coal Dust Environments (Class I, Group I) |
Overview
The Hengao De CFZ15 Portable Intrinsically Safe Negative-Pressure Gas Sampler is an ATEX-compliant field instrument engineered for reliable, representative sampling of ambient air, stack emissions, and underground mine atmospheres. It operates on the principle of controlled negative-pressure aspiration using a brushless DC diaphragm pump, eliminating spark hazards in explosive atmospheres. Unlike manual rubber-bulb or double-ball syringe samplers, the CFZ15 delivers consistent volumetric draw under defined vacuum conditions—critical for subsequent quantitative analysis by gas chromatography (GC), Fourier-transform infrared spectroscopy (FTIR), or electrochemical sensor arrays. Its design adheres to fundamental requirements for sampling integrity per ISO 16000-10 (indoor air), EPA Method TO-15 (summa canister sampling preparation), and China’s HJ/T 397–2007 (stationary source emission monitoring). The unit is certified for use in Zone 0/1 hazardous locations where methane (CH₄) and combustible coal dust are present, satisfying IEC 60079-0 and GB 3836.1–2021 standards.
Key Features
- Intrinsically safe brushless DC motor with no risk of thermal or electrical ignition in flammable environments
- Integrated high-capacity lithium polymer battery (8.4 V) — leak-proof, maintenance-free, and rated for ≥300 charge cycles
- Dedicated LED power and battery-level indicators for real-time operational status verification
- Die-cast aluminum housing with IP54-rated ingress protection against dust and splashing water
- Modular quick-connect sampling ports compatible with standard 6-mm OD PTFE tubing and stainless-steel probe assemblies
- Calibration traceable to NIST-traceable flow meters; factory-certified vacuum accuracy ±3% of full scale at -90 kPa
Sample Compatibility & Compliance
The CFZ15 supports grab sampling of gaseous matrices including O₂, N₂, CO, CO₂, CH₄, C₂H₄, and volatile organic compounds (VOCs) without adsorption or catalytic interference. Its inert wetted path—comprising PTFE diaphragm, stainless-steel valve seats, and fluorosilicone seals—ensures chemical compatibility with acidic, alkaline, and hydrocarbon-rich streams. The sampler complies with GB/T 16157–1996 (determination of particulate and gaseous pollutants from stationary sources), AQ/T 4274–2016 (coal mine air quality monitoring), and meets functional safety requirements aligned with IEC 61508 SIL1 for field instrumentation. It is routinely deployed in third-party environmental monitoring labs accredited to CNAS-CL01 (equivalent to ISO/IEC 17025).
Software & Data Management
While the CFZ15 is a stand-alone analog device with no embedded firmware or digital interface, it integrates seamlessly into GLP/GMP-compliant workflows via external documentation protocols. Each unit ships with a unique serial-numbered calibration certificate indicating date of verification, flow rate deviation, and vacuum stability test results. Users maintain audit trails using paper-based sampling logs or electronic lab notebooks (ELN) such as LabArchives or Benchling—recording time-stamped location data, operator ID, sample ID, and pre/post-sampling barometric pressure. For automated data capture, optional Bluetooth-enabled flow loggers (e.g., Sierra Instruments QuadraTherm 640i) may be plumbed in-series upstream of the sampler inlet.
Applications
- Pre-concentration sampling for GC-MS analysis of BTEX compounds in landfill gas monitoring wells
- Time-weighted average (TWA) exposure assessment for CO and NOₓ in underground coal mining operations
- Stack testing of combustion efficiency parameters (O₂ excess, CO slip) per GB 13271–2014
- Baseline air quality surveys in petrochemical fence-line monitoring programs
- Validation of fixed continuous emission monitoring systems (CEMS) during periodic performance audits
FAQ
Is the CFZ15 suitable for sampling hydrogen sulfide (H₂S)?
Yes — its PTFE-wetted components resist corrosion from H₂S up to 100 ppmv at ambient temperature. For extended exposure >500 ppmv, recommend inline stainless-steel particulate filters and gold-plated sampling lines.
Can the unit be used underwater or submerged?
No — it is rated IP54 only. Submersion voids explosion protection certification and risks diaphragm seal failure.
Does the sampler require periodic recalibration?
Per ISO/IEC 17025 Clause 7.7, flow verification is recommended every 6 months or after 200 operating hours — whichever occurs first — using a primary-standard dry-cal gas meter.
What is the shelf life of the battery when stored unused?
When stored at 25 °C and 40% state-of-charge, the lithium polymer cell retains ≥90% capacity for 12 months.
Can the CFZ15 be connected to a data logger for remote telemetry?
Not natively — it lacks analog/digital outputs. However, external pressure transducers (e.g., Honeywell ASDX series) mounted on the vacuum port enable 4–20 mA signal integration with SCADA systems.
