UMEx 200 Passive Samplers, for Sulfur Dioxide and Nitrogen Dioxide, pk/10

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Part Number: 500-200

UMEx 200 Passive Samplers, for Sulfur Dioxide and Nitrogen Dioxide, pk/10 Overview

UMEx 200 Passive Sampler, for sulfur dioxide and nitrogen dioxide, with validated concentration range of 0.4 to 8 ppm for SO2 and 0.05 to 8 ppm for NO2; single use only, pk/10
Limited shelf-life

The UMEx 200 Passive Sampler collects sulfur dioxide (SO2) at 15.2 ml/min and nitrogen dioxide (NO2) at 17.3 ml/min. The UMEx 200 contains a tape treated with triethanolamine (TEA) and “blank" to sample from 15 minutes to 24 hours. Analysis is performed by ion chromatography (IC) with conductivity detection.


Performance Profile

Sampling Rate SO2: 15.2 ml/min with a relative standard deviation of 16.5%
NO2: 17.3 ml/min with a relative standard deviation of 11.4%
Validated Concentration Range SO2: 0.4 to 8 ppm
NO2: 0.051 to 8.5 ppm
Analysis Method Solvent extraction and ion chromatography with conductivity detection
Lower Detection Limits

SO2:   15 min: 1.8 ppm
                8 hrs: 52 ppb
              24 hrs: 17.4 ppb

NO2: 15 min: 0.2 ppm
               8 hrs: 6.3 ppb
             24 hrs: 2 ppb

Shelf-life 18 mos from date of manufacture at ambient temperature
Storage Before use: Ambient temperature
After use: Ambient temperature or at < 39.2 F (4 C) and analyze within 3 weeks
SO2: ± 30%

NO2: ± 27%
Temperature Effects

SO2: No effect on sampling rate from 20 to 25 C

NO2: No effect on sampling rate from 22 to 40 C

Humidity Effects No effect from 20 to 80% relative humidity (RH)
Wind Velocity Velocity Effects No effect from 5 to 100 cm/sec
Interferences None identified
Dimensions 3.4 x 1.1 x 0.35 in (8.6 x 2.8 x 0.89 cm)
Weight 0.38 oz (10.9 gm)
Slide Cover Yellow


  • Passive Sampler Use : Nitrogen Dioxide
  • Passive Sampler Use : Sulfur Dioxide
  • Passive Sampler Sorbent : Treated Tape
  • Validation Level : Partial

UMEx 500-200 with Callouts

The single-use SKC UMEx 200 Passive Sampler effectively collects sulfur dioxide (SO2) at a sampling rate of 15.2 ml/min and/or nitrogen dioxide (NO2) at 17.3 ml/min. The lightweight UMEx 200 contains the sample medium (tape treated with triethanolamine [TEA]) and clips in the breathing zone for easy occupational sampling. Samplers are provided in individual aluminized pouches that can be used to transport the sampler to a laboratory. The label on the outside of each pouch contains the shelf-life date for easy inventory management.

Using the UMEx 200 Passive Sampler
Sampling with the UMEx 200 Passive Sampler for sulfur dioxide and/or nitrogen dioxide is easy and requires no pump or training. Simply remove the sampler from the pouch, record sampling information, and slide the cover to the "on" or sampling position. Clip the sampler on a worker for occupational sampling up to eight hours. When sampling is complete, slide the cover to the "off" position, place the sampler back in the pouch immediately, and seal. Send the sampler to an accredited laboratory for analysis by solvent extraction ion chromatography (IC) with conductivity detection.

Potential Sources of Workplace Exposure to Sulfur Dioxide and Nitrogen Dioxide

Sulfur dioxide is used in industry as a(n):

  • Intermediate in sulfuric acid manufacture
  • Bleaching agent
  • Disinfectant
  • Fumigant
  • Solvent
  • Refrigerant
  • Food preservative
  • Reagent in the manufacture of magnesium, sodium sulfite, and other chemicals

Other sources are:

  • Copper smelting
  • Processing or burning coal or fuel oil
  • Manufacturing paper and fertilizers

Nitrogen Dioxideis used in:

  • Agricultural silos
  • Arc or gas welding, especially in confined space
  • Electroplating plants
  • Food and textile bleaching
  • Jewelry manufacturing
  • Nitric acid production
  • Nitrogen fertilizer production
  • Nitro-explosive production
  • Pickling plants

    Source: OSHA Method ID-182

Other UMEx Passive Samplers Available
The same convenient and economical UMEx design is also available for sampling formaldehyde/other aldehydes (UMEx 100), ammonia (UMEx 300) and amines (UMEx 400).