GAS109A Oil Mist Gastec Airtec Tubes 0.3 - 1.5mg/m3


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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


GAS109A Oil Mist Compressed Breathing Air Detector Tubes - 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

0.3 to 1.5mg/m3

Sampling Rate

1000ml/min (60000ml)

Correction Factor


Sampling Time

60 minutes

Colour Change

White         Dark Green

Reaction Principle

Oil + I2O5 + H2S2O7           I2

Coefficient of Variation

15% (for 0.3 to 0.5mg/m³), 10% (for 0.5 to 1.5mg/m3)

Shelf Life

Up to 2 years from point of manufacture

Corrections for
temperature & humidity

Temperature correction is unnecessary for 0-40ºC

Store the tubes at cool and dark place.

Calibration gas generation

Diffusion tube method


Q.  We used GAS109A oil mist tubes recently and they turned pink. Can you explain what happened?

A. There could be too much water in the sample and it makes GAS109A pink. 


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