The Gastec 131P Vinyl Chloride Detector Tubes are designed for sensitive, low-level measurement of vinyl chloride (CH2) in air using a compatible automatic air sampling pump.
The 131P provides a quantitative measuring range of 50 to 1,500 µg/m³, with a detection limit of 10 µg/m³ under the specified sampling conditions. The detector system produces a yellow-to-pale-reddish-purple color change for visual determination of vinyl chloride concentration.
IMPORTANT: The Gastec 131P uses two connected tubes for each measurement. Each box contains 10 tubes for a total of 5 tests.
Automatic Air Sampling Pump Required
IMPORTANT: Gastec 131P Vinyl Chloride Detector Tubes require a compatible automatic air sampling pump capable of maintaining a continuous 100 mL/min sampling rate.
Correct Automatic Sampling Pump:
Gastec GSP-501FT Automatic Air Sampling Pump
The 131P is an automatic air sampling pump detector tube and should not be treated as a standard hand-pump detector tube.
Accurate measurement requires drawing 3,000 mL of air through the connected detector tube system at 100 mL/min for 30 minutes.
Do not substitute a standard manual Gastec detector tube pump for the required automatic sampling method.
Measurement & Sampling Specifications
| Measurement Range | Sampling Rate | Sample Volume | Correction Factor | Sampling Time |
|---|---|---|---|---|
| 50–1,500 µg/m³ | 100 mL/min | 3,000 mL | 1 | 30 Minutes |
The Gastec 131P requires continuous sampling at 100 mL/min for 30 minutes, producing a total sample volume of 3,000 mL.
The correction factor is 1 under the specified sampling conditions. Temperature and atmospheric-pressure corrections should be applied when required.
Product Specifications
Brand: Gastec
Tube Type: Vinyl Chloride Detector Tube for Automatic Air Sampling Pump
Part Number: 131P
Gas/Vapor Measured: Vinyl Chloride
Chemical Formula: CH2
Measurement Range: 50–1,500 µg/m³
Detection Limit: 10 µg/m³ at 3,000 mL (minimum detectable concentration; not part of the quantitative measuring range)
Sampling Rate: 100 mL/min
Sample Volume: 3,000 mL
Correction Factor: 1
Sampling Time: 30 Minutes
Color Change: Yellow → Pale Reddish Purple
Operating Temperature: 5–35°C (41–95°F), temperature correction required
Operating Humidity: 20–80% RH, humidity correction not required
Relative Standard Deviation: 10% for 50–500 µg/m³; 5% for 500–1,500 µg/m³
Quantity: 10 Tubes
Tests per Box: 5 Tests
Shelf Life: 24 Months
Pump Requirement: Gastec GSP-501FT or Compatible Automatic Air Sampling Pump
Two-Tube Measurement System
The Gastec 131P requires two tubes to be connected together for each measurement.
The primary tube and analyzer tube must be prepared and connected according to Gastec's instructions before the detector system is attached to the automatic air sampling pump.
Because two tubes are consumed during each measurement, one box containing 10 tubes provides 5 complete tests.
Always follow the official Gastec 131P instruction manual for proper tube preparation, connection, orientation, and sampling procedure.
Low-Level Vinyl Chloride Measurement
The Gastec 131P is designed for sensitive measurement of vinyl chloride in the µg/m³ concentration range and is categorized by Gastec for sampling hazardous air pollutants.
Its quantitative measuring range extends from 50 to 1,500 µg/m³.
The 10 µg/m³ detection limit represents the minimum concentration capable of producing a detectable reaction under the specified 3,000 mL sampling conditions. It is not part of the quantitative measuring range and should not be interpreted as a 10–1,500 µg/m³ measurement range.
During sampling, vinyl chloride is oxidized to produce hydrogen chloride, resulting in the detector's visible yellow-to-pale-reddish-purple color change.
Common Applications
Gastec 131P Vinyl Chloride Detector Tubes may be used for applicable low-level vinyl chloride monitoring applications including:
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Hazardous Air Pollutant Sampling
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Environmental Air Monitoring
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Low-Level Vinyl Chloride Monitoring
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Industrial Hygiene Investigations
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Chemical & Polymer Manufacturing
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PVC Manufacturing & Processing Environments
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Industrial Emission Investigations
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Environmental Atmospheric Monitoring
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Laboratory & Research Applications
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Leak & Release Investigations
Temperature Correction
The Gastec 131P is designed for use between 5 and 35°C (41–95°F) and temperature correction is required.
Use the temperature-correction table provided in the official Gastec 131P instruction manual to determine the corrected concentration based on the detector tube reading and actual sampling temperature.
The specified relative humidity range is 20–80% RH, and humidity correction is not required within this range.
Atmospheric-pressure correction may also be required according to Gastec's official measurement procedure.
Possible Interferences
Certain coexisting substances may affect Gastec 131P measurements.
p-Dichlorobenzene: May produce a positive interference and independently produce a pale reddish purple color.
1,2-Dichloroethylene: May produce a positive interference and pale reddish purple color.
Trichloroethylene: May produce a positive interference and pale reddish purple color.
Tetrachloroethylene: May produce a positive interference and pale reddish purple color.
Gastec identifies the following as producing no interference and no independent color change under the manufacturer's stated test conditions:
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Ammonia
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Hydrogen Chloride
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Chlorine
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Nitrogen Oxides
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1,1,1-Trichloroethane
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Aromatic Hydrocarbons
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Formaldehyde
Coexisting gases and vapors should always be considered when interpreting detector tube measurements.
Outdoor Measurement — Important
When performing an outdoor measurement, keep the Gastec 131P detector tubes out of direct sunlight during sampling.
Direct sunlight should be avoided throughout the sampling period according to Gastec's manufacturer instructions.
Important
A Gastec GSP-501FT or compatible automatic air sampling pump is required for correct use of the Gastec 131P Vinyl Chloride Detector Tubes.
Purchase the Correct Automatic Sampling Pump:
Gastec GSP-501FT Automatic Air Sampling Pump
Sampling is performed at 100 mL/min for 30 minutes, producing a total sample volume of 3,000 mL.
Two detector tubes must be connected for each measurement. Therefore, 10 tubes provide 5 complete tests.
Do not use a standard manual Gastec detector tube pump in place of the required automatic sampling method.
Temperature and atmospheric-pressure corrections should be applied when required according to Gastec's official instructions.
For outdoor measurements, keep the detector tubes out of direct sunlight during sampling.
Always follow Gastec's official instructions for tube preparation and connection, sampling rate, sample volume, sampling time, temperature correction, atmospheric-pressure correction, environmental conditions, possible interferences, and interpretation of results.
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