GAS91D Formaldehyde Passive Dosi-Tubes 0.1 - 20ppm

SKU: GAS91D

Be the first to review this product

GAS91D


Next Working Day Delivery - When Ordering Gastec Detector 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

Details

GAS91D Formaldehyde Gastec Passive Sampling Dosi Tubes (Time Weighted Average Detector Tubes)

The Dosi-Tube System allows an operator to evaluate the level of gas a worker is exposed to over a time period such as a working shift.

The Dosi-Tube is easily clipped into the dosi-tube holder (GAS710) which is worn on a garment of clothing.

Performance

Measuring Range

0.1 to 20 ppm

Sampling Hours

1 to 10 hours

Detecting Limit

0.05 ppm (10 hours)

Colour Change

Yellow        Reddish Brown

Reaction Principle

Formaldehyde reacts with hydroxylamine phosphate to liberate Phosphorous acid, which discolours pH indicator to reddish brown.

Coefficient of Variation

10% (for 1 to 20 ppm∙hr)

Shelf Life

Up to 1 year from point of manufacture

Corrections for
temperature & humidity

Unnecessary

Store the tubes in the refrigerator to keep at 10oC (50oF) or below.

 

Possible coexisting substances and their interferences

 

 

Substance

Interference

Change colour by itself

Aldehydes, Ketones, Acid gases

Plus error

Discolours reddish brown

 

Other substance measurable with this detector tube

 

Substance

Correction Factor

Sampling Time

Measuring Range

Acetaldehyde

1.0

1 to 10 hours

0.1 to 20 ppm

Furfural

3.0

1 to 10 hours

0.3 to 60 ppm

Methyl Ethyl Ketone

1.25

1 to 10 hours

0.125 to 25 ppm

           

Calibration gas generation

Diffusion tube method

Reviews

Write Your Own Review

Only registered users can write reviews. Please, log in or register

Product Downloads

View FileGAS91D Formaldehyde Datasheet
View FileGastec Detector Tube List 23rd Edition & Manual
Have an enquiry - Contact Us
You may also like...