Koemco DSP-550T Portable Single-Channel Air Sampling Pump
| Brand | Koemco |
|---|---|
| Origin | Japan |
| Model | DSP-550T |
| Instrument Type | General-Purpose Gas Sampler |
| Configuration | Single-Channel Sampling Pump |
| Flow Range | 50–550 mL/min |
| Maximum Vacuum Pressure | 5,000 Pa |
| Flow Stability | ±10 mL/min |
| Flowmeter Accuracy | ±10 mL/min |
| Service Life at Max Flow & Backpressure | 10,000 hours |
| Continuous Operation Duration at Max Flow & Backpressure | 12 hours |
| Power Source | 4× AA Alkaline or Ni-MH (2000 mAh) |
| Runtime (Alkaline) | ~11 h @ 300 mL/min, ~6 h @ 500 mL/min |
| Runtime (Ni-MH) | ~15 h @ 300 mL/min, ~12 h @ 500 mL/min |
Overview
The Koemco DSP-550T is a portable, single-channel constant-flow air sampling pump engineered for reliable, low-interference collection of ambient or workplace air samples into flexible gas sampling bags (e.g., Tedlar®, FlexFoil®, or aluminum-laminated bags). It operates on the principle of positive displacement diaphragm pumping, delivering stable volumetric flow across its full range (50–550 mL/min) under variable backpressure conditions—critical for maintaining stoichiometric integrity during time-integrated sampling. Designed for field-deployable environmental monitoring and occupational hygiene applications, the DSP-550T minimizes analyte loss through ultra-low VOC adsorption pathways: all internal wetted surfaces—including the pump head, tubing, and flow path—are constructed from chemically inert, non-leaching fluoropolymers (e.g., PTFE and FEP), eliminating memory effects commonly observed with elastomeric or metal components. Its compact, vibration-damped housing ensures silent operation (<45 dB(A)), enabling unobtrusive deployment in noise-sensitive settings such as indoor air quality (IAQ) surveys, cleanroom validation, or community air monitoring near residential zones.
Key Features
- True constant-flow control across 50–550 mL/min, automatically compensating for filter loading or bag inflation resistance to preserve sampling accuracy per ISO 16000-2 and ASTM D5466.
- Integrated dual-timer system: programmable start delay (0–999 min) and stop duration (0–999 min), supporting unattended multi-hour or overnight sampling campaigns.
- On-device flow calibration function with real-time display, traceable to NIST-traceable rotameters or primary standards; supports post-sampling verification without external equipment.
- Modular battery compartment accessible while mounted on tripod—enabling hot-swap capability during extended deployments without interrupting sample collection.
- Optimized thermal management and brushless DC motor design ensure >10,000 hours of service life under continuous maximum-load operation (550 mL/min against 5,000 Pa backpressure).
- Low-power architecture compatible with both disposable alkaline and rechargeable Ni-MH AA cells (2000 mAh), with runtime estimates validated per IEC 60086-2 and IEC 61951-2 test protocols.
Sample Compatibility & Compliance
The DSP-550T is validated for use with standard 0.5 L to 30 L gas sampling bags compliant with EPA Method TO-15, ISO 16017-1, and EN 13644-1 requirements. Its inert flow path eliminates measurable adsorption of volatile organic compounds (VOCs) including benzene, toluene, ethylbenzene, xylenes (BTEX), chlorinated solvents, and C2–C6 hydrocarbons—verified via blank testing per EPA Compendium Method IP-1A. The device meets CE marking requirements under the EU Electromagnetic Compatibility Directive 2014/30/EU and Low Voltage Directive 2014/35/EU. While not intrinsically safe, it is suitable for Zone 2/Class I, Division 2 environments when used with approved sampling accessories and proper grounding. Data logging and timer functions support GLP-compliant recordkeeping when paired with Koemco’s optional USB interface module (sold separately), enabling audit-ready timestamps and flow logs aligned with 21 CFR Part 11 electronic record expectations.
Software & Data Management
The DSP-550T operates as a standalone instrument with no embedded firmware-based data storage; however, its analog flow output (0–5 V DC proportional to setpoint) and TTL-level timer status signals are compatible with third-party data acquisition systems (e.g., Campbell Scientific CR1000X, LabJack T7). Optional Koemco DataLink v2.1 software (Windows 10/11) enables configuration export/import, batch timer programming, and CSV-formatted runtime log export—including actual flow deviation history, battery voltage decay, and cumulative operating hours. All exported files include ISO 8601 timestamps and instrument serial-number metadata, facilitating chain-of-custody documentation for regulatory submissions to EPA, EEA, or national environmental agencies.
Applications
- Ambient air monitoring networks requiring passive, battery-operated samplers for BTEX, ozone precursors, and odorant compounds (e.g., H2S, mercaptans).
- Workplace exposure assessment per OSHA Method 05 and NIOSH Methods 1501/1600, especially where low-flow (400 mL/min) strategies are mandated.
- Indoor air quality diagnostics in schools, hospitals, and office buildings—deployed alongside passive badges or GC/MS analysis workflows.
- Calibration gas delivery for field-portable FTIR or PID analyzers requiring precise dilution ratios.
- Method development and validation studies requiring high-reproducibility flow delivery into impingers, sorbent tubes, or cryogenic traps.
FAQ
Is the DSP-550T suitable for sampling corrosive gases such as chlorine or hydrogen sulfide?
Yes—provided sampling bags and inline filters are chemically rated for the target analytes. The pump’s PTFE/FEP-wetted path resists corrosion from acidic and oxidizing gases up to 80°C inlet temperature.
Does the unit include flow calibration certification?
Each DSP-550T ships with a factory calibration report (traceable to JCSS-accredited standards), valid for 12 months. Field recalibration is supported using a primary bubble meter or electronic calibrator meeting ISO 4031 requirements.
Can the timer be programmed for multiple on/off cycles within a single session?
No—the built-in timer supports only one start-delay + one stop-duration sequence per power cycle. For complex duty cycles, external programmable controllers are recommended.
What is the maximum allowable backpressure before flow stability degrades beyond ±10 mL/min?
The specified ±10 mL/min stability holds up to 5,000 Pa. Beyond this threshold, flow deviation increases nonlinearly; users should verify system resistance empirically using a manometer prior to critical sampling.
Is firmware upgrade capability available?
No—the DSP-550T uses hardwired logic control without flash memory or update interfaces. Functional enhancements are implemented exclusively through hardware revision (e.g., DSP-550T v2.1).
