Gastec FG-3A Flammable Gas Sensor

Description

The FG-3A utilizes a Wheatstone Bridge circuit principle. It consists of two platinum wire coils: a detector cell coated with an oxidation catalyst and a reference cell treated to remain inert. When exposed to flammable gas, the gas burns on the detector cell, increasing its electrical resistance. The resulting imbalance in the bridge circuit provides a measurement directly proportional to the gas concentration.

The sensor is enclosed in explosion-proof protective sintered metal and stainless steel mesh. This design allows the gas to enter for measurement while preventing any internal sparks from igniting the surrounding atmosphere.

Brand

Gastec

Although, technology is always evolving, one demand on our products never changes: the demand for customer safety. Whenever we contribute to customer safety, we are presented with an opportunity to develop further.

GASTEC holds this corporate creed of safety and development in high esteem, as it strives to grow while always putting customer safety first.

Features

Universal Sensitivity: Shows almost equal sensitivity to the LEL threshold of virtually all combustible gases, allowing for broad-spectrum safety monitoring.
Linear Output: Provides a stable, near-straight line output curve from zero up to the explosion threshold.
Compact & Low Power: Its small footprint (33 x 30 x 36 mm) and efficient power consumption make it ideal for battery-operated handheld devices.
Environmental Stability: Engineered to be resilient against changes in ambient temperature and humidity, ensuring reliable readings in diverse field conditions.
Intrinsically Safe: The sintered metal housing acts as a flame arrestor, making the sensor suitable for use in hazardous industrial sectors.

Specifications

Feature	Specification
Model Number	FG-3A
Detection Principle	Catalytic Combustion
Compatible Devices	MA-2510, GOM-3A, GOMHC-3A
Dimensions	33 x 30 x 36 mm
Weight	30g
Measurement Range	0 – 100% LEL (Lower Explosive Limit)

Applications

Hand-held Detectors: The primary sensing element for the Gastec MA-2510 series used by safety officers for on-site leak detection.
Explosion Prevention: Monitoring methane levels in coal mines, refineries, and chemical processing plants.
Safety Control: Integrated into industrial systems to provide early warning of flammable gas build-up.
Emergency Response: Used by fire departments and hazmat teams to assess the explosive potential of unknown chemical leaks.