The Gastec 113TP Isopropyl Alcohol Detector Tubes are designed for measurement of isopropyl alcohol (IPA / CH3CH(OH)CH3) in air using a compatible automatic air sampling pump.

The 113TP provides a quantitative measuring range of 20 to 400 ppm, with a detection limit of 5 ppm under the specified sampling conditions. The tube produces a pale-vermilion-to-pale-blue color change for visual determination of isopropyl alcohol concentration.

Each box contains 10 detector tubes for 10 tests.

Automatic Air Sampling Pump Required

IMPORTANT: Gastec 113TP Isopropyl Alcohol Detector Tubes require a compatible automatic air sampling pump capable of maintaining a continuous 100 mL/min sampling rate.

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

The 113TP 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 200 ppm, a fresh tube is used at the same 100 mL/min flow rate for 5 minutes, followed by application of the specified ×2 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
20–200 ppm	100 mL/min	1,000 mL	1	10 Minutes
200–400 ppm	100 mL/min	500 mL	2	5 Minutes

For measurements from 20 to 200 ppm, sample at 100 mL/min for 10 minutes, providing a total sample volume of 1,000 mL.

For measurements above 200 ppm and up to 400 ppm, use a fresh detector tube and sample at 100 mL/min for 5 minutes, providing a total sample volume of 500 mL. Multiply the detector tube reading by the specified 2 correction factor.

Product Specifications

Brand: Gastec
Tube Type: Isopropyl Alcohol Detector Tube for Automatic Air Sampling Pump
Part Number: 113TP
Gas/Vapor Measured: Isopropyl Alcohol (IPA)
Chemical Formula: CH3CH(OH)CH3 / i-C3H7OH
Measurement Range: 20–400 ppm
Primary Measurement Range: 20–200 ppm
Extended Measurement Range: 200–400 ppm
Detection Limit: 5 ppm at 1,000 mL (minimum detectable concentration; not part of the quantitative measuring range)
Sampling Rate: 100 mL/min
Primary Sample Volume: 1,000 mL
Extended-Range Sample Volume: 500 mL
Correction Factor: 1 or 2 depending on measurement range
Primary Sampling Time: 10 Minutes
Extended-Range Sampling Time: 5 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 20–60 ppm; 5% for 60–200 ppm
Quantity: 10 Tubes
Tests per Box: 10 Tests
Shelf Life: 36 Months
Pump Requirement: Compatible Automatic Air Sampling Pump Required

Isopropyl Alcohol Measurement

The Gastec 113TP provides quantitative measurement of isopropyl alcohol concentrations from 20 to 400 ppm using two sampling procedures.

The 5 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 5–400 ppm measuring range.

During sampling, isopropyl alcohol reacts with the detector tube reagent to produce a visible pale-vermilion-to-pale-blue color change.

Common Applications

Gastec 113TP Isopropyl Alcohol Detector Tubes may be used for applicable IPA vapor monitoring applications including:

• Industrial Hygiene & Occupational Exposure Monitoring

• Isopropyl Alcohol Vapor Monitoring

• Solvent Use & Handling Areas

• Cleaning & Degreasing Operations

• Chemical Manufacturing & Processing

• Electronics & Manufacturing Facilities

• Laboratory & Research Applications

• Industrial Process Air Monitoring

• Leak & Release Investigations

• Workplace Air Monitoring

Temperature Correction

The Gastec 113TP is designed for use between 0 and 40°C (32 to 104°F) and requires temperature correction.

Gastec specifies the following temperature correction factors:

Temperature	Correction Factor
0°C (32°F)	1.45
5°C (41°F)	1.25
10°C (50°F)	1.20
15°C (59°F)	1.10
20°C (68°F)	1.00
25°C (77°F)	0.95
30°C (86°F)	0.90
35°C (95°F)	0.85
40°C (104°F)	0.80

Apply the appropriate temperature correction factor to the detector tube reading according to Gastec's instructions.

No humidity correction is required within the specified 10–90% RH range.

Gastec notes that the detecting layer may change to yellow when used in a high-humidity environment, but this does not affect the tube reading.

Atmospheric pressure correction may also be required according to the official Gastec 113TP instruction manual.

Possible Interferences

Certain coexisting substances may affect Gastec 113TP 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 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 113TP Isopropyl Alcohol Detector Tubes.

For the primary 20–200 ppm range, sampling is performed at 100 mL/min for 10 minutes, producing a total sample volume of 1,000 mL.

For the extended 200–400 ppm range, use a fresh detector tube and sample at 100 mL/min for 5 minutes, producing a total sample volume of 500 mL. Multiply the detector tube reading by the 2 correction factor.

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 113TP instructions.

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

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

 

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