The Gastec 111TP Methanol Detector Tubes are designed for measurement of methanol (CH3OH) in air using a compatible automatic air sampling pump.

The 111TP provides a quantitative measuring range of 20 to 300 ppm, with a detection limit of 3 ppm under the specified sampling conditions. The tube produces a pale-vermilion-to-pale-blue color change for visual determination of methanol concentration.

Each box contains 10 detector tubes for 10 tests.

Automatic Air Sampling Pump Required

IMPORTANT: Gastec 111TP Methanol Detector Tubes require a compatible automatic air sampling pump capable of maintaining a continuous 50 mL/min sampling rate.

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

The 111TP is an automatic air sampling pump detector tube and should not be treated as a standard hand-pump detector tube.

Accurate measurement requires drawing 500 mL of air through the detector tube at 50 mL/min for 10 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
20–300 ppm	50 mL/min	500 mL	1	10 Minutes

The Gastec 111TP requires a continuous sampling rate of 50 mL/min for 10 minutes, providing a total sample volume of 500 mL.

The correction factor is 1, allowing the concentration to be read directly from the detector tube scale after applying any required environmental correction.

Product Specifications

Brand: Gastec
Tube Type: Methanol Detector Tube for Automatic Air Sampling Pump
Part Number: 111TP
Gas Measured: Methanol
Chemical Formula: CH3OH
Measurement Range: 20–300 ppm
Detection Limit: 3 ppm at 500 mL (minimum detectable concentration; not part of the quantitative measuring range)
Sampling Rate: 50 mL/min
Sample Volume: 500 mL
Correction Factor: 1
Sampling Time: 10 Minutes
Color Change: Pale Vermilion → Pale Blue
Operating Temperature: 0–40°C (32–104°F), temperature correction required
Operating Humidity: 10–90% RH, humidity correction not required
Relative Standard Deviation: 10% for 20–100 ppm; 5% for 100–300 ppm
Quantity: 10 Tubes
Tests per Box: 10 Tests
Shelf Life: 24 Months
Pump Requirement: Compatible Automatic Air Sampling Pump Required

Methanol Measurement

The Gastec 111TP provides quantitative measurement of methanol concentrations from 20 to 300 ppm under the specified sampling conditions.

The 3 ppm detection limit represents the minimum concentration capable of producing a detectable reaction at the specified 500 mL sample volume. It is not part of the quantitative measuring range and should not be interpreted as a 3–300 ppm measurement range.

During sampling, methanol reacts with the detector tube reagent and produces a visible pale-vermilion-to-pale-blue color change.

Common Applications

Gastec 111TP Methanol Detector Tubes may be used for applicable methanol air-monitoring applications including:

• Industrial Hygiene & Occupational Exposure Monitoring

• Chemical Manufacturing & Processing

• Solvent Use & Handling Areas

• Laboratory & Research Applications

• Industrial Process Air Monitoring

• Methanol Storage & Handling Areas

• Leak & Release Investigations

• Workplace Air Monitoring

• Environmental Atmospheric Monitoring

• Methanol Vapor Testing

Temperature Correction

The Gastec 111TP is designed for use between 0 and 40°C (32 to 104°F) and requires temperature correction.

Apply the appropriate temperature correction according to the official Gastec 111TP instruction manual when determining the final methanol concentration.

The specified operating humidity range is 10–90% 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 111TP measurements.

Alcohols: May produce a positive interference and can independently produce a pale-blue color change.

Acetone: Gastec identifies no interference and no independent color change under the manufacturer's specified test conditions.

Ethyl Acetate: Gastec identifies no interference and no independent color change.

Toluene: Gastec identifies no interference and no independent color change.

n-Hexane: Gastec identifies no interference and no independent color change.

Benzene: Gastec identifies no interference and no independent color change.

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

Important

A compatible automatic air sampling pump is required for correct use of the Gastec 111TP Methanol Detector Tubes.

Accurate measurement requires sampling at 50 mL/min for 10 minutes, producing a total sample volume of 500 mL.

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 the official Gastec 111TP instructions.

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

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

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