Industrial / Gas Detection
Gastec 221LL Chloride Ion Detector Tube Instructions
Quick guide for the Gastec 221LL Chloride Ion Detector Tube. Learn how to safely use the detector tubes, interpret measurement results, handle interferences, and dispose of used tubes properly.
Quick answers from the manual
Quick answer
- The Gastec 221LL is used for detecting Chloride ion concentrations in waste water within the range of 10-200 mg/L. p. 1
Key actions
- Break the tube ends using a tip holder, then immerse the tube in the sample water until it reaches the upper plug. p. 1
Problems and fixes
Stain exceeds 200 mg/L
Dilute the sample with pure water and retest using a fresh tube.
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Technical specifications
| Parameter | Value | Meaning | Pages |
|---|---|---|---|
| Measuring Range | 10-200 mg/L | Detectable concentration range | p. 1 |
| Sampling Time | 1 minute | Time required for measurement | p. 1 |
Where to find it in the PDF
- Instructions and Specifications p. 1
Table of contents
Quick guide from the manual
The Gastec 221LL Chloride Ion Detector Tube is designed for detecting Chloride ion concentrations in waste water. Before use, ensure the water temperature is between 0-65°C and the pH value is between 3.0 and 11.0. The measurement takes 1 minute.
Safety and handling
Caution: When breaking the tube ends, keep them away from your eyes. Do not touch broken glass tubes or pieces with bare hands. The reagent contains hexavalent chromium; dispose of used tubes according to local government rules and regulations.
Measurement procedure
- Take sample water into an approximately 100 mL capacity of dry, clean beaker.
- Break tips off a fresh detector tube by bending each tube end in the tube tip holder.
- Immerse the filled end of the tube into the sample water as illustrated. Capillary action occurs and the sample water instantly rises through the reagent.
- When the water rises to the upper end plug, remove the tube.
- Read the concentration level at the interface where the stained reagent meets the unstained reagent.
- If the stain exceeds the highest calibration mark (200 mg/L), dilute the sample with pure water and retest using a fresh tube. Calculate the true concentration by multiplying the tube reading by the dilution ratio: (V1 + V2) / V1 * Tube Reading.
Specifications
- Measuring Range: 10-200 mg/L
- Sampling Time: 1 minute
- Detection Limit: 3 mg/L
- Colour Change: Brown to White
- Water Temperature: 0-65°C (32-149°F)
- pH Value: 3.0-11.0
Interferences
Certain substances may interfere with the measurement. For example, Cyanide ion, Bromide ion, and Iron (II) may cause interference. Please refer to the full interference table in the manual for specific concentration limits and effects on the test result.
Application for other substances
The detector tubes can be used to measure Bromide ion with a correction factor of 2.4, resulting in a measuring range of 24-480 mg/L.
Manufacturer information
Gastec Corporation
Practical help
Common problems
Stain exceeds the highest calibration mark (200 mg/L)
Dilute the sample with pure water and retest using a fresh tube. Multiply the reading by the dilution ratio.
Interference from other substances
Check the interference table in the manual. Some substances like Cyanide or Bromide ions can interfere with the reading.
Before use
- Check the expiration date on the tube box.
- Ensure water temperature is between 0-65°C.
- Ensure water pH is between 3.0 and 11.0.
- Prepare a clean, dry 100 mL beaker.
- Have a tube tip holder available for breaking the tube ends.
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Specs in practice
- Measuring Range
- The concentration range the tube is designed to detect (10-200 mg/L).
- Sampling Time
- The time required for the sample water to rise through the reagent (1 minute).
- Detection Limit
- The minimum concentration of Chloride ion detectable (3 mg/L).
Model compatibility
- Can be used for Bromide ion detection with a correction factor of 2.4.
Manual page author
Emily Carter
User documentation editor