Leak Detection For The Semiconductor Industry: A Growing Priority For Modern Facilities

Predictable Failures, Catastrophic Consequences

On 21 June 2026, a catastrophic ammonia leak at a seafood processing factory in Periyapalayam, Tiruvallur district, Tamil Nadu killed at least nine workers and hospitalised over 70. The facility processed shrimp, fish, and other export-bound products - and its refrigeration system turned lethal in minutes.

This was not an isolated event. In November 2023, a separate ammonia leak at a seafood export unit near Chennai port killed one worker and injured three. Globally, the U.S. Chemical Safety Board's final report on a July 2024 ammonia release at a Cuisine Solutions facility in Sterling, Virginia documented dozens of injured workers and "critical deficiencies in the facility's safety systems."

The pattern is consistent: equipment failure, seal and gasket degradation, corrosion, and faulty pressure relief account for roughly 36% of ammonia refrigeration incidents. These are not freak accidents. They are predictable failures of detection, maintenance, and design.

Choose the Right Sensor — And It Is Not What You Might Think

Because ammonia's danger is overwhelmingly toxic, not flammable, the sensor selection must be optimised for low-ppm accuracy. This immediately rules out two technologies that are commonly - and wrongly - specified for ammonia.

Placement Is Everything — And the Standard Is Specific

A perfectly specified sensor in the wrong location is useless. The Industrial Refrigeration Consortium (IRC) and IIAR 2-2021 standards provide clear guidance:

• Proximity: Sensors should be located within 30 feet (~9 metres) of each potential leak source - compressors, valves, flanges, and pressure relief discharge points.
• Height: Mount in the breathing zone, approximately 5 feet (1.5 metres) off the floor. Because ammonia is lighter than air, ceiling-mounted sensors alone may miss ground-level leaks in the early stage before the gas rises.
• Redundancy: IIAR 2-2021 raised the minimum number of low-range (25-150 ppm) detectors in compressor rooms from one to two. For engine rooms up to 4,000 sq ft, the standard calls for two 0-250 ppm sensors for complete coverage and redundancy.
• Non-machinery rooms: IIAR 2-2021 also extended detection requirements to packaged ammonia systems and non-machinery spaces where ammonia piping or equipment is present.

In practice, the most common placement errors we see are: single-sensor installations where the standard requires two, sensors mounted too high (catching only late-stage rising gas), and sensors placed in dead-air zones where airflow patterns never carry leaked gas to the detector. A proper placement study - mapping airflow, leak sources, and occupancy patterns - is not optional. It is engineering.

Calibration: The Silent Failure

The most dangerous gas detector is one that reads zero because its sensor is dead. Ammonia sensors - particularly electrochemical types - drift over time. Without regular calibration with certified NH₃ gas, a sensor can under-read by 30% or more while displaying a confident "0 ppm" on the controller.

• Bump test with certified gas before any critical period (shift start, pre-entry, after long idle periods).
• Full calibration every 3-6 months for fixed EC sensors, or per manufacturer specification - whichever is more frequent.
• Sensor replacement on a preventive schedule (typically 12-24 months for EC, longer for MOS and IR), not a reactive one.
• Calibration records maintained for audit and regulatory compliance. If you cannot prove the detector was working, the law assumes it was not.

Know What Applies to You

Ammonia refrigeration and process plants in India operate under a layered regulatory framework:

Engineered Detection, Not a Procurement Line Item

We built our business on the belief that gas detection is not a procurement line item - it is a safety system that must be engineered, installed, calibrated, and maintained with the same rigour as the process it protects. Ammonia is one of the most demanding gases to detect reliably: it is corrosive, it attacks sensor materials, it causes olfactory fatigue, and its toxic threshold is 500 times lower than its flammable threshold.

Our approach is end-to-end: consultation to identify the real hazard profile, sensor technology selection matched to the environment and the actual toxic range, professional installation and commissioning, operator training, and lifetime support through AMC and calibration services.