Hydrogen cyanide (HCN) is an extremely toxic gas that can pose severe health risks even at low concentrations. In field checks, the correct measurement range, the appropriate detector tube, and the correct sampling pump must be selected together.
Why is HCN a critical gas?
HCN is a toxic compound that can act very rapidly. Olfactory perception is not a reliable safety indicator; evaluation must be conducted using an appropriate measurement method. If continuous alarm capability is required in areas with HCN risk, personal or fixed electronic gas detection systems should be evaluated separately.
How is HCN measured with a Kitagawa detector tube?
In detector tubes based on colour change, a specific volume of air is drawn through the tube, and the reactive reagent layer reacts with the target gas. The resulting discolouration enables the concentration to be read from the scale on the tube. The measurement result can be affected by pump strokes, temperature, humidity, and interfering gases present in the environment.
Primary difference between 112SB and 112SC
Kitagawa 112SB may be selected for a wider HCN measurement range, whereas 112SC may be preferred for more sensitive field checks at low ppm levels. The final selection should be made not only based on expected concentration, but also on sampling time and ambient conditions.
Why is the AP-20 pump important?
For the detector tube to yield accurate results, the volume of air specified by the manufacturer must be drawn through the tube. The Kitagawa AP-20 manual aspirating pump is designed to operate with the tube system. Pumps of different brands may not guarantee the same volume and flow characteristics.
When should detector tubes be used?
Detector tubes are practical for process control, suspected leaks, pre-maintenance checks, and rapid assessment of short-term concentration at a specific point. However, if continuous alarm or personal exposure monitoring across a shift is required, a different measurement system is necessary.
Let us select the correct tube for HCN measurement together
Share your expected concentration, temperature, humidity, and potential interfering gases; let the NOVEL Technical Team assist you in determining the appropriate Kitagawa tube and pump combination.
Frequently Asked Questions
Should 112SB or 112SC be selected for HCN?
112SB can be considered for a wider concentration range, and 112SC for more sensitive checks at low ppm levels. The final selection should be made according to site conditions.
Does an HCN detector tube replace a continuous gas alarm?
No. Detector tubes are intended for short-term field measurements. If continuous alarm, data logging, or employee safety is required, an appropriate electronic gas detector must be used.
How should HCN tubes be stored?
The storage temperature and expiry date on the manufacturer's current label and technical documentation must be taken as a basis. Cold storage is required for certain HCN tubes.
Where can I source Kitagawa HCN tubes in Turkey?
For Komyo Kitagawa products, the NOVEL Technical Team provides product selection, quotations, application support, and after-sales technical support.
Sources and Technical References
- Komyo Rikagaku Kogyo K.K. – Kitagawa 112SB/112SC technical documents
- Komyo Rikagaku Kogyo K.K. – AP-20 Gas Aspirating Pump
- ISO 17621 – Short term detector tube measurement systems
This content has been prepared for general technical information purposes. In measurement, risk assessment, and regulatory compliance activities, current manufacturer documentation, applicable legislation, and relevant standards must be taken as authoritative.