Description
Gastec detector tube No. 121 measures benzene in air from 2.5 to 120 ppm. Break both tips off the tube, fit it to a Gastec GV-100 or GV-110 hand pump and draw the number of pump strokes listed for the expected range. The reagent changes from white to dark green, and the stain shows the gas concentration. Read the concentration directly on the scale printed on the tube. 10 tubes per box give 10 tests.
Benzene vapour is found around crude oil, gasoline and other petroleum products, for example during tank cleaning and sampling. A tube gives a spot reading and does not replace a certified gas monitor where your site procedure requires one. Use only Gastec tubes with a Gastec pump, break the tips away from your eyes, and never handle broken glass or reagent with bare hands.
Features
- Measures benzene from 2.5 to 120 ppm
- Colour change white to dark green
- Direct-reading scale printed on the tube
- For use with a Gastec GV-100 or GV-110 hand pump
- 10 tubes per box, 36-month shelf life
- Each production lot is tested and calibrated by the manufacturer
Specifications
| Brand | Gastec |
|---|---|
| Manufacturer part number (MPN) | 121 |
| Big Papa SKU | BP-L-IG121 |
| Type | Colourimetric detector tube |
| Gas measured | benzene |
| Measuring range | 2.5–120 ppm |
| Pump strokes and sampling time | 2.5–5 ppm: 4 strokes (400 mL) in 6 min; 5–60 ppm: 2 strokes (200 mL) in 3 min; 60–120 ppm: 1 stroke (100 mL) in 1.5 min |
| Colour change | white to dark green |
| Detection limit | 0.5 ppm (4 strokes) |
| Operating temperature | 0 to 40 °C (32 to 104 °F) |
| Relative humidity | 0 to 90 % |
| Temperature correction | Not required |
| Tubes per box | 10 |
| Shelf life | 36 months |
| Model No. | 121 |
| Disposal note | contains 0.78 mg of hexavalent chromium per the SDS; dispose of per local regulations |
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