Gastec O2-204G Oxygen Sensor

Description

The O2-204G operates on the galvanic cell principle, functioning as a self-powered electrochemical battery. Oxygen molecules diffuse through the sensing membrane and are reduced at the cathode, generating an electrical voltage directly proportional to the oxygen concentration (0.0–25.0%).

With dimensions of 20 x 20 x 22 mm, it is designed to fit into the specialized internal manifolds of the GOA-7H handheld detector. Because it is a galvanic cell, it produces a signal the moment it is exposed to oxygen, requiring no warm-up time and ensuring immediate readiness for safety inspections.

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

Galvanic Cell Technology: Self-generating signal that requires no external power to drive the chemical reaction.
Rapid Response Time: Features a $T_{90}$ response of $leq$ 15 seconds, ensuring immediate notification if oxygen levels drop.
Analytical Precision: Provides highly accurate readings in 0.1% increments, essential for detecting subtle changes in air quality.
Miniaturized Form Factor: At just 15g, it helps maintain the portability of handheld safety devices like the GOA-7H.
Wide Operating Range: Engineered to perform reliably in temperatures ranging from -10°C to 40°C.

Specifications

Feature	Specification
Model Number	O2-204G
Detection Principle	Galvanic Cell
Compatible Devices	GOA-7H, GOC-200
Dimensions	20 x 20 x 22 mm
Weight	15g
Target Gas	Oxygen ( $O_2$ )
Standard Range	0.0 – 25.0%

Applications

Internal Manifold Integration: The O2-204G is applied by seating it into the internal sensor bay of the GOA-7H or GOC-200 monitor.

Installation: Open the monitor housing and firmly press the sensor into the multi-pin socket on the PCB. Ensure the sensing face is aligned with the diffusion inlet.
Thermal Equilibrium: While the sensor works instantly, allow the unit to sit in fresh air for 3 to 5 minutes after installation to ensure the internal electrolyte reaches environmental temperature.
21% Span Calibration: Perform a “One-Touch” or manual air calibration. In a clean, fresh-air environment, adjust the monitor to read 20.9% (or 21.0% depending on the specific model’s resolution).
Maintenance: Check the calibration before each work shift. If the monitor cannot be zeroed or adjusted to 20.9% in fresh air, the chemical capacity of the O2-204G is exhausted and it must be replaced.