Gastec 15l Nitric Acid Detector Tube Instructions (+ PDF)

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 O -40 °C (32 -104 °F).
Use this tube within the absolute humidity range of 4 -16 mg /L.
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 Nitric Acid 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 not ice.)

Measuring Range	0.1 -1 ppm	1 – 20 ppm	20 – 40 ppm
Number of Pump Strokes	2 – 10	1	1/2
Stroke Correction Factor	1/2 – 1/10	1	2
Sampling Time	30 seconds per pump stroke
Detecting Limit	0.05 ppm ( n = 10 )
Colour Change	Yellow → Reddish purple
Reaction Principle	HNO3 + Indicator → Reaction Products

Coefficient of Variation : 15% (for 1 to 5 ppm), 10% (for 5 to 20 ppm)
**Shelf Life : Please refer to the validity date printed on the tube box.
**Store the tubes in a dark and cool place.

CORRECTION FOR TEMPERATURE, HUMIDITY AND PRESSURE :

Temperature : No correction is required between O -40 °C (32 -104 °F).
Humidity : Correct for humidity with the table below:

Absolute Humidity (mg / L)	4	6	8	10	12	14	16
Correction Factor	0.55	0.68	0.85	1	1.17	1.3	1.35

Pressure : To correct for pressure, use the formula below

* This value is after other correction(s), if any ,are applied .

MEASUREMENT PROCEDURE:

For checking the leakage of the pump, insert a freshly sealed detector tube into pump.
Follow instructions provided with the pump operating manual.
Break tips off a fresh detector tube with the tube tip breaker in the pump.
Insert the tube into the pump inlet with 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 30 seconds and confirm the completion of the sampling.
For smaller measurements less than 1 ppm, repeat the above sampling procedure 1 -9 more times until the stain reaches the first calibration mark. For measurements higher than 20 ppm, prepare a fresh tube and perform a half pump stroke.
Read the concentration level at the interface where the stained reagent meets the unstained reagent.
If humidity correction is necessary , obtain the true concentration by using the humidity correction factor. Afterwards multiply the correction factor of pump stroke if necessary.
If pressure correction is necessary , use the pressure correction formula.

INTERFERENCES:

Substance	Concentration	Interference	Changes colour by itself to
Hydrogen chloride	≥1/10	＋	Reddish purple
Chlorine		No	Bleach
Carbon monoxide		No	No discolouration
Nitrogen dioxide		No	No discolouration
Organic solvents		No	No discolouration

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.

APPLICATION FOR OTHER SUBSTNCES :

Tube 15L can also be used for other substances as below:

Substance	Correction Factor	No. of Pump Strokes	IMeasuring Range
Hydrogen bromide	0.8	1	0.8 —16 ppm
Trichloroacetic acid	Refer to scale below	1	1— 37 ppm

Trichloroacetic acid (ppm)
Tube 15L Reading (n=1)

CORRECTION FACTOR :

Detector tubes are primarily designed to measure specific gases. But it is also possible to measure other substances of similar chemical properties with the aid of a correction factor or chart. Therefore, please make use of the correction factor/chart measuring ranges as a reference. For more precise factor please contact your Gastec distributor.

DANGEROUS AND HAZARDOUS PROPERTIES :

Threshold Limit Value-Time Weighted Average by ACGIH (2022) : 2 ppm
Threshold Limit Value-Short Term Exposure Limit: by ACGIH (2022): 4 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.

WARRANTY:

If you have any questions regarding gas detection and the quality of the tubes, please feel free to contact your Gastec representatives.

Manufacturer : Gastec Corporation
8-8-6 Fukayanaka, Ayase-City, Kanagawa 252-1195, Japan
https://www.gastec.eo.jp/
Telephone +81-467-79-3910 Facsimile +81-467-79-3979

IM0015LE3
Printed in Japan
23B1Z