GAS11A Nitrogen Oxides Gastec Detector Tubes 0.02 - 2ppm


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Next Working Day Delivery - When Ordering Gastec Tubes from a1-cbiss, we aim to deliver to your site for the next working day.

Large UK Stock Holding - 95% of our Gastec Detector Tubes are held in stock so our delivery times are quick

Gastec Price Promise - We'll better any like for like competitors' offer. Provide us with a valid quote and we will beat it

Shelf Life - a1-cbiss will never dispatch detector tubes with less than 3 months remaining before expiry. a1-cbiss employ a stock rotation policy of first in, first out. Specific shelf life requirements must be identified at the point of order placement (use the comment box in the checkout process). The expiry date is printed clearly on the front of the detector tube packet.

Excl. VAT: £35.00 Incl. VAT: £42.00
Excl. VAT: £35.00 Incl. VAT: £42.00

Product Description


GAS11A Nitrogen Oxides Gastec Airtec Tubes

Used in conjunction with the a1-cbiss Breathing Air Quality Kit, Gastec Airtec Tubes are a convenient and simple system for testing air quality within gas cylinders, compressed breathing air and air lines in compliance with EN12021

When self-contained breathing apparatus are used for respiratory protection, the quality of the breathing air requires special attention.

Contaminants generated by the compressor or cylinder can be harmful to the worker and respiratory equipment


Measuring Range

0.02 to 0.7 ppm

0.06 to 2 ppm

Sampling Rate

100ml/min (500ml)

100ml/min (200ml)

Correction Factor



Sampling Time

5 minutes

2 minutes

Colour Change

White        Bluish Green

Reaction Principle

ABTS + NO₂          Bluish green product

Coefficient of Variation

10% (for 0.02 to 0.2 ppm), 5% (for 0.2 to 0.7 ppm)

Shelf Life

Up to 3 years from point of manufacture

Corrections for
temperature & humidity


Store the tubes at cool and dark place.

Calibration gas generation

Permeation tube method


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