Why Does Hydrogen Chloride (HCl) Always "Hide" in Chlor-Alkali Workshops? The Senior Supervisor's Method for Checking Detection Blind Spots

I. Why Is HCl Leakage Always "Undetectable"?

In the electrolysis workshop of a chlor-alkali plant, operators smelled an irritating odor, but the handheld detector showed "0 ppm". When a long-pole probe was inserted into the gaps of pipeline flanges, the reading rose to 20 ppm. The reason is that HCl gas accumulates in narrow gaps, which are difficult to reach with conventional detection positions.

II. Precautions for HCl Detection

1. HCl Hazard Thresholds

Olfactory threshold: 0.5 ppm; concentrations > 5 ppm immediately cause coughing and chest tightness

Concentrations > 50 ppm: May lead to laryngeal spasm, pulmonary edema, and even death

2. Detection Difficulties

1.HCl is highly soluble in water. When humidity > 85%, it forms acid mist, which adheres to the probe surface and disables detection

2.Leak points are mostly in narrow areas such as valve packings and flange gaskets, which are hard to reach with conventional sampling methods

3. Operational Key Points

1.Equip with a long sampling rod (length ≥ 1.5 meters) during detection to reach into gaps for testing

2.Clean the probe with deionized water weekly to remove residual acid mist

III. Solution: MST 101 Portable HCL Gas Detector + GAS sampling pump + Extended Sampling Tube

Key Features:

• ✔ Moisture-resistant design: The probe is equipped with a PTFE (polytetrafluoroethylene) filter membrane to prevent acid mist blockage
• ✔ Detection range: 0-500 ppm; resolution: 0.1 ppm, capable of capturing trace leaks
• ✔ Sampling rod + 3-meter extension hose, suitable for detecting in narrow spaces
• ✔ Portable single-gas detector combined with handheld pump can be transformed into a pump suction detector

Application Feedback:

After using this solution, a chlor-alkali plant increased its HCl leak detection rate to 100%.

Have you encountered the problem of "gap leak omission" during HCl detection? Send a private message with "Blind Spot Check" to get a customized detection roadmap!