The Gastec 133TP Tetrachloroethylene Detector Tubes are designed for measurement of tetrachloroethylene (Cl2C) in air using the Gastec GSP-501FT or another compatible automatic air sampling pump.

Also commonly known as perchloroethylene (PCE or PERC), tetrachloroethylene can be quantitatively measured from 2.5 to 84 ppm using the Gastec 133TP.

The detector system produces a yellow-to-reddish-purple color change, with a detection limit of 0.25 ppm under the specified 1,000 mL sampling conditions.

IMPORTANT: The Gastec 133TP 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 133TP Tetrachloroethylene Detector Tubes require a compatible automatic air sampling pump capable of maintaining the specified continuous sampling rates.

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

The 133TP 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 10 minutes.

For concentrations above 40 ppm, a fresh tube set is sampled at 50 mL/min for 10 minutes, followed by application of the specified ×2.1 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
2.5–40 ppm	100 mL/min	1,000 mL	1	10 Minutes
40–84 ppm	50 mL/min	500 mL	2.1	10 Minutes

For measurements from 2.5 to 40 ppm, sample at 100 mL/min for 10 minutes, providing a total sample volume of 1,000 mL.

For measurements above 40 ppm and up to 84 ppm, prepare a fresh tube set and sample at 50 mL/min for 10 minutes, providing a total sample volume of 500 mL. Multiply the detector tube reading by the specified 2.1 correction factor.

Product Specifications

Brand: Gastec
Tube Type: Tetrachloroethylene Detector Tube for Automatic Air Sampling Pump
Part Number: 133TP
Gas/Vapor Measured: Tetrachloroethylene / Perchloroethylene (PCE)
Chemical Formula: Cl2C
Measurement Range: 2.5–84 ppm
Primary Measurement Range: 2.5–40 ppm
Extended Measurement Range: 40–84 ppm
Detection Limit: 0.25 ppm at 1,000 mL (minimum detectable concentration; not part of the quantitative measuring range)
Primary Sampling Rate: 100 mL/min
Extended Sampling Rate: 50 mL/min
Primary Sample Volume: 1,000 mL
Extended Sample Volume: 500 mL
Correction Factor: 1 or 2.1 depending on measurement range
Sampling Time: 10 Minutes
Color Change: Yellow → Reddish Purple
Operating Temperature: 0–40°C (32–104°F), temperature correction required
Operating Humidity: 0–90% RH, humidity correction not required
Relative Standard Deviation: 10% for 2.5–15 ppm; 5% for 15–40 ppm
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 133TP requires two tubes to be connected together for each measurement.

Prepare and connect the tubes according to Gastec's official instructions before attaching the assembled detector tube system 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 133TP instruction manual for correct tube preparation, connection, orientation, and sampling procedure.

Tetrachloroethylene / PCE Measurement

The Gastec 133TP provides quantitative measurement of tetrachloroethylene concentrations from 2.5 to 84 ppm.

Tetrachloroethylene is also commonly referred to as perchloroethylene, PCE, or PERC, making the 133TP useful for applications where these alternative chemical names are used.

The 0.25 ppm detection limit represents the minimum concentration capable of producing a detectable reaction under the specified 1,000 mL sampling conditions. It is not part of the quantitative measuring range and should not be interpreted as a 0.25–84 ppm measurement range.

During sampling, tetrachloroethylene reacts within the detector system, producing a visible yellow-to-reddish-purple color change.

Common Applications

Gastec 133TP Tetrachloroethylene Detector Tubes may be used for applicable PCE vapor-monitoring applications including:

• Industrial Hygiene & Occupational Exposure Monitoring

• Workplace Tetrachloroethylene Monitoring

• Dry Cleaning Facilities

• Degreasing & Metal Cleaning Operations

• Solvent Use & Handling Areas

• Chemical Manufacturing & Processing

• Industrial Process Air Monitoring

• Leak & Release Investigations

• Laboratory & Research Applications

• PCE / PERC Vapor Monitoring

Environmental Corrections

The Gastec 133TP is designed for use between 0 and 40°C (32–104°F) and temperature correction is required.

Use the temperature-correction information provided in the official Gastec 133TP instructions to determine the corrected concentration based on the detector tube reading and actual sampling temperature.

The specified relative humidity range is 0–90% 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 133TP measurements.

Hydrogen Chloride: At concentrations of 1/5 or greater relative to the tetrachloroethylene concentration, may produce a positive interference and reddish-purple color.

Chlorine: At concentrations of 1/10 or greater, may produce a negative interference and pale-yellow color.

Vinyl Chloride: At concentrations of 1/5 or greater, may produce a positive interference and reddish-purple color.

1,2-Dichloroethylene: At concentrations of 1/5 or greater, may produce a positive interference and reddish-purple color.

Trichloroethylene: At concentrations of 1/5 or greater, may produce a positive interference and reddish-purple color.

1,1,1-Trichloroethane: At concentrations of 800 ppm or less, Gastec identifies no interference and no independent color change.

Toluene & Xylene: At concentrations of 20 ppm or greater, may produce a negative interference without independently changing color.

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

Important

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

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

For the primary 2.5–40 ppm range, sampling is performed at 100 mL/min for 10 minutes, producing a total sample volume of 1,000 mL.

For the extended 40–84 ppm range, prepare a fresh tube set and sample at 50 mL/min for 10 minutes, producing a total sample volume of 500 mL. Multiply the detector tube reading by the 2.1 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.

Always follow Gastec's official instructions for tube preparation and connection, sampling rate, sample volume, sampling time, correction factors, environmental conditions, possible interferences, and interpretation of results.

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