I. Overview
The DWK-5000E explosion-proof constant current locatable medium flow atmospheric sampler, independently researched and manufactured by Yancheng Dewang Instrument Equipment Co., Ltd., is a patented instrument capable of collecting gaseous or vapor samples from the atmosphere. It is suitable for individual toxic substance sampling of occupational hazards at workplaces and for sampling dust-like substances such as metals; it is also applicable to routine and emergency monitoring of environmental atmosphere, public health, and occupational health.
The Constant-Current Locatable Low-Flow Atmospheric Sampler is primarily composed of: operating system, intelligent control system, air pump, flow measurement system, and positioning data upload module. It can continuously operate for over 8 hours on a single charge, convenient for sampling tasks. The instrument features real-time display of flow rate, sampling volume, sampling time, temperature, atmospheric pressure, and battery level. It is compact in structure, small in size, light in weight, durable, has strong load-bearing capacity, stable and accurate flow rate, and low noise. It is portable and easy to use when sampling.
Section II: Application Fields
The DWK-5000E Constant-Current Locatable Low-Flow Sampler is an ideal instrument for short-term or long-term air sampling by environmental protection personnel in disease prevention centers, environmental monitoring stations, colleges and universities, research institutions, and testing agencies.
Standard of Execution:
JJG956-2013规程 for Calibration of Atmospheric Samplers
GBZ/T300-2017 Standard for Sampling of Hazardous Substances in Workplace Air
GB50325-2020 Standard for Indoor Environmental Pollution Control of Civil Engineering Construction Projects
HJ 194-2017 "Technical Specification for Manual Monitoring of Ambient Air Quality"
Section 3: Technical Specifications
Flow Range: (0-5000ml/min) (Flow adjustable)
2. Constant Current Mode: Electronic Digital Constant CurrentSupports various functions including data entry, mobile data collection, historical data download, data logic verification and audit, statistical analysis, and visual presentation.（With digital DTU positioning module, capable of real-time upload of sampling data, fault alarms, and display of sampling location latitude and longitude.Flow is unaffected by voltage fluctuations and air resistance changes.◆ Anti-backflow Device for Absorbent Liquid Particle Matter: A patent (Patent No.: ZL2020 2 1017091.7) obtained for our company's specially developed gas sampling equipment. The primary function of this device is to prevent the backflow of absorbent liquid into the instrument during sampling. In case of backflow, the device completely blocks the liquid from entering the instrument's interior, and it also features an alert function. When the absorbent liquid reaches the sampling device, a white circular sticker turns red upon contact with the liquid, alerting the user. The instrument will sound an alarm, with the fault light blinking, and automatically shut down after 30 seconds. At this point, one only needs to pause the main unit, open the water-resistant device, clean it, replace the worn water-resistant membrane, and continue working. This significantly reduces the instrument's failure rate and effectively streamlines the sampling work time, eliminating the need for factory repairs.
3. Flow Error: ≤±2.5%
4. Traffic Stability: ≤3%
5. Traffic Repetition: ≤2%
6. Timing Error: ≤±0.01%
7. Timing Range: 1min to 99h 59min
8. Operating Temperature: -10 to 50°C
9. Relative Humidity: ≤95%RH
10. Battery Life: Not less than 8 hours
11. Load Capacity: ≥ 3500 Pa
12. Sampling Mode: ① Recurring Sampling (99 cycles), with options for repetitive volume or time-based sampling. Set the sampling time, interval time, and number of cycles.
② Manual sampling; after setting the sampling flow, sampling can be directly initiated, with a running timer, and manually stopped.
③ Schedule sampling, set the sampling time, and the sampling will stop once the time is reached.
④ Constant-volume sampling (1000L), set sampling volume for sampling.
12. (1) Lock Function: The panel lock feature prevents settings from being altered during the pump's operation.
12 (2) Flow Fault Correction: Fault alarm function display when flow variation exceeds ±5% within the back pressure specification range.
After 30 seconds, if the error cannot be corrected, the pump will cease operation.
12 (3) The extra-large LCD screen can simultaneously display: flow rate, sampling time, sampling volume, back pressure, battery estimated sampling time, date, time, operating mode, battery remaining power.
12 (4) Humidity Range: Operating humidity: 5-95%, non-condensing; Storage humidity: 5-98%, non-condensing
12 (5) You can view the real-time working data, actual conditions, latitude and longitude information, etc., of the sampler on our provided cloud platform.
13. Main Unit Dimensions: 130*44*95mm (Length*Width*Height)
14. Operating Noise: <55 dB
15. Instrument Weight: 0.52 kg
16. Power: DC 7.4V, 220VAC ±10%
17. Volume Calculation: Real-time Display
18. Data Storage & Download: 1000 sets of real-time queryable sample data
19. Explosion-proof Certificate No.: CNV20.0234 Explosion-proof Mark: EXibIIbT4 Gb
