GASTEC 92L Acetaldehyde Detector Tube Instruction Manual

: June 11, 2024
: GASTEC

Table of Contents

GASTEC 92L Acetaldehyde Detector Tube
FOR SAFE OPERATION
SPECIFICATION
CORRECTION FOR TEMPERATURE, HUMIDITY AND PRESSURE
MEASUREMENT PROCEDURE
INTERFERENCES
INSTRUCTIONS ON DISPOSAL
WARRANTY
References
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GASTEC 92L Acetaldehyde Detector Tube

GASTEC-92L-Acetaldehyde-Detector-Tube-PRO

FOR SAFE OPERATION

Carefully read this manual and the instruction manual of your Gastec Gas Sampling Pump

WARNING:

Use only Gastec detector tubes in a Gastec pump.
Do not interchange or use non-Gastec parts or components in Gastec’s detector tube and pump system.
Using non-Gastec parts or components in Gastec’s detector tube and pump system or using a non-Gastec detector tube with a Gastec pump or using a Gastec detector tube with a non-Gastec pump may damage your detector tube and pump system, or may cause serious injuries, or death to the end-user. It will also void all warranties, and guarantees regarding performance and data accuracy.

CAUTION: If you do not observe the following precautions, you may suffer injuries or damage the product.

When breaking the tube ends, keep away from eyes.
Do not touch the broken glass tubes, broken pieces and reagent with bare hand(s).
The sampling time represents the time necessary to draw the air sample through the tube. The tube must be positioned in the desired sampling area for the entire sampling time or until the flow finish indicator indicates the end of the sampling.

NOTES : For maintaining performance and reliability of the test results, observe the following.

Use Gastec Gas Sampling Pump together with Gastec Detector Tubes only for the purposes specified in the instruction manual of the detector tube.
Use this tube within the temperature range of 5 – 40 C (41 – 104 F). If this tube were used below 5 C (41 F), the demarcation of the tube would be generated as a faint discolouration.
Use this tube within the relative humidity range of 20 – 90%.
This tube may be interfered with by the coexisting gases. Please refer to the table “INTERFERENCES” below.
The shelf life and storage condition of the tube are marked on the label of the tube box.

APPLICATION OF THE TUBE: Use this tube for detecting acetaldehyde in the air or in industrial areas and for determining the environmental atmospheric condition.

SPECIFICATION

(Because of Gastec’s commitment to continued improvement, specifications are subject to change without notice.) GASTEC-92L-Acetaldehyde-Detector-
Tube-2

Measuring Range	1 – 20 ppm
Number of Pump Strokes	1
Stroke Correction Factor	1
Sampling Time	2 minutes per pump stroke
Detecting Limit	0.2 ppm (n = 1)
Colour Change	Yellow → Reddish brown
Reaction Principle	3CH3CHO + (NH2OH)3H3PO4 → H3PO4 H3PO4 + Base → Phosphate

Coefficient of Variation: 10% (for 1 to 6 ppm), 5 % (for 6 to 20 ppm)
Shelf Life: Please refer to the validity date printed on the tube box. Store the tubes at 10°C (50°F) or below in a refrigerator.

CORRECTION FOR TEMPERATURE, HUMIDITY AND PRESSURE

Temperature: Correct for temperature with the table below.
Temperature C( F)| 5(41)| 10(50)| 15(59)| 20(68)| 25(77)| 30(86)| 35(95)| 40(104)
---|---|---|---|---|---|---|---|---
Correction Factor| 1.05| 1.0| 1.0| 1.0| 1.0| 1.0| 1.0| 0.95
Humidity: No correction is required between 20 – 90% R.H.
Pressure: To correct for pressure, use the formula below:

MEASUREMENT PROCEDURE

For checking the leakage of the pump, insert a freshly sealed detector tube into the pump. Follow the instructions provided with the pump operation manual.
Break the tips off the fresh detector tube with the tube tip breaker in the pump.
Insert the tube into the pump inlet with the arrow ( ) on the tube pointing toward the pump.
Make certain the pump handle is all the way in. Align the guide marks on the pump body with the guide marks on the handle.
Pull the handle all the way out until it locks at one pump stroke (100 mL). Wait two minutes and confirm the completion of the sampling.
Read the concentration level at the interface where the stained reagent meets the unstained reagent.
If temperature correction is necessary, obtain the true concentration by using the temperature correction factor.
If pressure correction is necessary, use the pressure correction formula.

INTERFERENCES

Substance| Concentration| Interference| Changes colour by itself to
---|---|---|---
Ketones| | +| Reddish brown
Aldehydes| | +| Reddish brown
Acid Gases| | +| Reddish brown
Ammonia| ≦30 ppm| No| No discoloration
Acetic Acid| ≧2 times| +| Reddish brown

This table of interference gases primarily expresses the interference of each coexisting gas in the concentration range, that is equivalent to the gas concentration. Therefore, the test result may show positive results due to other substances not listed in the table. If more information is needed, please contact us or our distributors in your territory.

DANGEROUS AND HAZARDOUS PROPERTIES: Threshold Limit Value-Ceiling by ACGIH (2021) : 25 ppm

INSTRUCTIONS ON DISPOSAL

The reagent of the tube does not use toxic substances. When disposing the tube regardless of whether it has been used or not, follow the rules and regulations of your local government.