User Manual for Gastec 151L Acetone Detector Tube

Quick guide from the manual

The Gastec 151L Acetone Detector Tube is designed for the detection of acetone in air or industrial environments. It must be used exclusively with a Gastec Gas Sampling Pump. Always store tubes in a refrigerator at 10°C (50°F) or below and check the expiration date on the box before use.

Measurement Procedure

1. Leak Check: Insert a fresh sealed detector tube into the pump and follow the pump operating manual to check for leaks.
2. Preparation: Break the tips off a fresh detector tube using the pump's tip breaker.
3. Insertion: Insert the tube into the pump inlet with the arrow on the tube pointing toward the pump.
4. Alignment: Ensure the pump handle is fully in. Align the guide mark on the pump body with the guide mark on the handle.
5. Sampling: Pull the handle all the way out until it locks at one pump stroke (100 mL). Wait two minutes and confirm the completion of sampling. Repeat the sampling procedure one more time for a total of two strokes.
6. Reading: Read the concentration level at the interface where the stained reagent meets the unstained reagent.
7. High Concentration: For measurements higher than 4000 ppm, use a fresh tube and perform only one pump stroke.

Corrections and Adjustments

Temperature Correction: The tube is calibrated at 20°C (68°F). If the temperature differs, apply corrections based on the provided temperature table. For example, at 0°C, a reading of 4000 ppm corresponds to 7000 ppm; at 40°C, it corresponds to 1900 ppm.

Pressure Correction: To correct for pressure, use the following formula: Tube Reading (ppm) x 1013 (hPa) / Atmospheric Pressure (hPa).

Pump Stroke Correction: If necessary, multiply the result by the correction factor. For 50-4000 ppm, the correction factor is 1 (2 strokes). For 4000-12000 ppm, the correction factor is 3 (1 stroke).

Interferences and Other Substances

Certain gases may interfere with the reading:

• Acrolein, Acetaldehyde: Interference (+), changes color to Red.
• Aromatic hydrocarbons: No interference, no discolouration.
• Methyl isobutyl ketone: Interference (+), changes color to Red.
• Methyl ethyl ketone: Interference (+), changes color to Red.

The 151L tube can also be used to measure other substances with specific correction factors:

• Methyl ethyl ketone: Correction factor 0.42 (5 pump strokes, range 21-1680 ppm).
• Propionaldehyde: Correction factor 0.47 (2 pump strokes, range 24-1880 ppm).

Safety and Disposal

Do not touch broken glass or reagents with bare hands. Keep tube ends away from eyes when breaking. The reagent does not contain toxic substances; dispose of tubes according to local government regulations.