Panasonic SQ4-A22-P Chemical Liquid Leak Sensor

Technical Overview

Chemical-resistant PFA sensor with 12-24VDC PNP output, 10ms response, and IP67 rating for critical chemical leak detection in industrial environments.

Key Features

Specifically designed for chemical liquid leak detection, including Sulfuric acid, Hydrochloric acid, Phosphoric acid, Ammonia, Fluorinert™, Galden®, and Hydrofluoric acid.
Achieves Control Category 4 PLe SIL3 safety certification when integrated with the SQ4-C11 safety controller.
Functions as Category 1 PLc SIL1 in standalone applications.
Constructed with a highly chemical-resistant PFA enclosure.
Provides PNP open-collector transistor output for both leakage detection and auxiliary initial detection.
Rapid response time of 10 ms or less for leakage detection.
Features short-circuit protection for output circuits.
Rated IP67 and IP65 for protection against dust and water ingress in harsh industrial settings.
Equipped with a 2-meter PFA cabtyre connection cable.

Technical Specification Matrix

Parameter	Value
Part Number	SQ4-A22-P
Sensing Object	Sulfuric acid, Hydrochloric acid, Phosphoric acid, Ammonia, Fluorinert™, Galden®, Hydrofluoric acid etc.
Supply Voltage	12 to 24 V DC ±10 % (Ripple P-P 10 % or less)
Current Consumption	30 mA or less
Output Type	PNP open-collector transistor (2 channels)
Maximum Source Current (Detection Output)	50 mA
Residual Voltage (Detection Output)	2.5 V or less (at 50 mA source current)
Response Time (Leakage Detection Output)	10 ms or less
Response Time (Auxiliary Detection Output)	50 ms or less
Short-circuit Protection	Incorporated
Operating Temperature Range	-10 to +55° C (No dew condensation or icing)
IP Rating	IP67, IP65
Enclosure Material	PFA
Cable Length	2 meters
Cable Material	PFA
Safety Certification	Control Category 4 PLe SIL3 (with controller), Category 1 PLc SIL1 (standalone)
Physical Weight (kg)	0.05
Dimensions L x W x H (cm)	4.7 x 3.58 x 1.87

Industrial Applications

1. Hazardous Chemical Processing Line Monitoring

The Panasonic SQ4-A22-P sensor is perfectly suited for continuous monitoring of chemical processing lines handling corrosive substances such as sulfuric acid, hydrochloric acid, or ammonia. Its PFA enclosure ensures resistance to these aggressive chemicals, preventing sensor degradation.

Problem Solved

Prevents catastrophic equipment damage, environmental contamination, and worker injury by providing immediate detection of chemical leaks in pipelines and reaction vessels, leveraging its fast 10ms response time and robust chemical compatibility.

Chemical ResistanceHazardous Material DetectionIP67Fast Response TimeSIL3 Compliance

2. Semiconductor Cleanroom Chemical Leak Detection

In semiconductor manufacturing, where highly pure and often corrosive chemicals like Fluorinert™ or hydrofluoric acid are used, the SQ4-A22-P can monitor for leaks around processing tools and chemical delivery systems. Its compact size allows for integration into complex machinery within strict cleanroom protocols.

Problem Solved

Minimizes wafer contamination and expensive production downtime by quickly identifying even minute chemical leaks (10ms response) from critical equipment. The sensor's chemical-specific detection and robust PFA construction are essential for maintaining the integrity of sensitive processes.

Cleanroom CompatibilityCorrosive Liquid DetectionHigh Purity ChemicalsRapid DetectionPFA Enclosure

3. Battery Manufacturing Electrolyte Leak Prevention

In battery production or recycling facilities, the SQ4-A22-P sensor can be deployed to detect leaks of corrosive electrolytes (e.g., sulfuric acid) from battery cells, filling machines, or storage areas. Its 12-24VDC power supply is standard for integration into industrial control systems.

Problem Solved

Mitigates fire risks, environmental hazards, and costly cleanups associated with electrolyte spills. The sensor's chemical resistance and IP67 rating ensure reliable operation in challenging battery manufacturing environments, providing critical safety alerts through its PNP outputs.

Electrolyte MonitoringCorrosion ProtectionBattery Production SafetyIP67Industrial Control System Integration