The Gastec 133P Tetrachloroethylene Detector Tubes are designed for sensitive, low-level measurement of tetrachloroethylene (Cl2C) in air using a compatible automatic air sampling pump.

The 133P provides a quantitative measuring range of 20 to 720 µg/m³, with a detection limit of 5 µg/m³ under the specified sampling conditions. The detector system produces a yellow-to-purple color change for visual determination of tetrachloroethylene concentration.

IMPORTANT: The Gastec 133P 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 133P Tetrachloroethylene 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 Gastec 133P is an automatic air sampling pump detector tube and should not be treated as a standard hand-pump detector tube.

For the primary measuring range, sampling is performed at 100 mL/min for 30 minutes. For concentrations above 300 µg/m³, a fresh tube set is sampled at 100 mL/min for 15 minutes, followed by application of the specified ×2.4 correction factor.

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
20–300 µg/m³	100 mL/min	3,000 mL	1	30 Minutes
300–720 µg/m³	100 mL/min	1,500 mL	2.4	15 Minutes

For measurements from 20 to 300 µg/m³, sample at 100 mL/min for 30 minutes, providing a total sample volume of 3,000 mL.

For measurements above 300 µg/m³ and up to 720 µg/m³, prepare a fresh tube set and sample at 100 mL/min for 15 minutes, providing a total sample volume of 1,500 mL. Multiply the detector tube reading by the specified 2.4 correction factor.

Product Specifications

Brand: Gastec
Tube Type: Tetrachloroethylene Detector Tube for Automatic Air Sampling Pump
Part Number: 133P
Gas/Vapor Measured: Tetrachloroethylene
Chemical Formula: Cl2C
Measurement Range: 20–720 µg/m³
Primary Measurement Range: 20–300 µg/m³
Extended Measurement Range: 300–720 µg/m³
Detection Limit: 5 µg/m³ at 3,000 mL (minimum detectable concentration; not part of the quantitative measuring range)
Sampling Rate: 100 mL/min
Primary Sample Volume: 3,000 mL
Extended Sample Volume: 1,500 mL
Correction Factor: 1 or 2.4 depending on measurement range
Primary Sampling Time: 30 Minutes
Extended Sampling Time: 15 Minutes
Color Change: Yellow → Purple
Operating Temperature: 5–40°C (41–104°F), temperature correction required
Operating Humidity: 20–80% RH, humidity correction not required
Relative Standard Deviation: 10% for 20–100 µg/m³; 5% for 100–300 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 133P requires two tubes to be connected together for each measurement.

The primary tube and analyzer tube must be prepared and connected using the supplied rubber tubing according to Gastec's instructions. The analyzer tube is then inserted securely into the automatic air sampling pump with the arrow pointing toward the pump.

Because two tubes are consumed during each measurement, one box containing 10 tubes provides 5 complete tests.

Always follow the official Gastec 133P instruction manual for correct tube preparation, connection, orientation, and sampling procedure.

Low-Level Tetrachloroethylene Measurement

The Gastec 133P is designed for sensitive measurement of tetrachloroethylene in the µg/m³ concentration range.

Its total quantitative measuring range extends from 20 to 720 µg/m³ using two sampling procedures.

The 5 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 5–720 µg/m³ measurement range.

During sampling, tetrachloroethylene reacts with the detector tube reagent, producing a visible yellow-to-purple color change.

Common Applications

Gastec 133P Tetrachloroethylene Detector Tubes may be used for applicable low-level air-monitoring applications including:

• Hazardous Air Pollutant Sampling

• Environmental Air Monitoring

• Low-Level Tetrachloroethylene Monitoring

• Industrial Hygiene Investigations

• Dry Cleaning & Solvent Operations

• Degreasing & Metal Cleaning Operations

• Chemical Manufacturing & Processing

• Industrial Emission Investigations

• Laboratory & Research Applications

• Leak & Release Investigations

Temperature Correction

The Gastec 133P is designed for use between 5 and 40°C (41–104°F) and temperature correction is required.

Use the temperature-correction table provided in the official Gastec 133P instruction manual to determine the corrected concentration based on the 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 133P measurements.

Vinyl Chloride: May produce a positive interference and independently produce a purple color.

1,2-Dichloroethylene: May produce a positive interference and independently produce a purple color.

Trichloroethylene: May produce a positive interference and independently produce a purple color.

Gastec identifies the following substances as producing no interference and no independent color change under the manufacturer's stated test conditions:

• Hydrogen Chloride

• Chlorine

• 1,1,1-Trichloroethane

• Toluene

• Xylene

Coexisting gases and vapors should always be considered when interpreting detector tube measurements.

Outdoor Measurement — Important

When performing an outdoor measurement, keep the Gastec 133P detector tubes out of direct sunlight during sampling.

Gastec specifically includes this precaution in the manufacturer instructions for the 133P.

Important

A Gastec GSP-501FT or compatible automatic air sampling pump is required for correct use of the Gastec 133P Tetrachloroethylene Detector Tubes.

Purchase the Correct Automatic Sampling Pump:
Gastec GSP-501FT Automatic Air Sampling Pump

For the primary 20–300 µg/m³ range, sampling is performed at 100 mL/min for 30 minutes, producing a total sample volume of 3,000 mL.

For the extended 300–720 µg/m³ range, prepare a fresh tube set and sample at 100 mL/min for 15 minutes, producing a total sample volume of 1,500 mL. Multiply the detector tube reading by the 2.4 correction factor.

Two detector tubes must be connected for each measurement. Therefore, 10 tubes provide 5 complete tests.

Do not use a standard manual 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, correction factors, environmental corrections, possible interferences, and interpretation of results.

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