Gastec 15L Nitric Acid Detector Tube User Manual

Quick Guide for Gastec 15L Detector Tube

The Gastec 15L Nitric Acid Detector Tube is designed for measuring Nitric Acid concentrations in air or industrial environments. For safe and accurate operation, always use this tube in conjunction with a Gastec Gas Sampling Pump. Do not use non-Gastec components, as this may cause injury, damage the product, or void warranties.

Measurement Procedure

1. Check the pump for leakage by inserting a fresh detector tube into the pump.
2. Break the tips off a fresh detector tube using the tube tip breaker on the pump.
3. Insert the tube into the pump inlet with the arrow pointing toward the pump.
4. Ensure the pump handle is fully pushed in and align the guide marks on the pump body with the guide marks on the handle.
5. Pull the handle all the way out until it locks at one pump stroke (100 mL). Wait 30 seconds and confirm the completion of sampling.
6. For smaller measurements (less than 1 ppm), repeat the sampling procedure 1-9 more times until the stain reaches the first calibration mark.
7. For measurements greater than 20 ppm, prepare a fresh tube and perform a half pump stroke.
8. Read the concentration level at the interface where the stained reagent meets the unstained reagent.
9. If humidity or pressure correction is necessary, apply the correction factors as described in the manual.

Correction Factors

Temperature: No correction is required between 0-40°C (32-104°F).

Humidity: Apply correction factors based on the absolute humidity (mg/L) table provided in the manual. Factors range from 0.55 at 4 mg/L to 1.35 at 16 mg/L.

Pressure: To correct for pressure, use the formula: Tube Reading (ppm) x 1013 (hPa) / Atmospheric Pressure (hPa).

Interferences

The following substances may interfere with the reading:

• Hydrogen chloride: Causes a positive interference (reddish purple color).
• Chlorine: Causes bleaching.
• Carbon monoxide, Nitrogen dioxide, Organic solvents: No interference.

Note that the test may show positive results due to other substances not listed in the table. If more information is needed, contact Gastec or your local distributor.

Safety and Disposal

The reagent in the tube does not contain toxic substances. When disposing of the tube, follow the rules and regulations of your local government. Always keep broken glass tubes away from eyes and do not touch broken glass or reagents with bare hands.